2006 lines
54 KiB
C
2006 lines
54 KiB
C
/* DWARF 2 support.
|
|
Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
|
|
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 bfd_boolean lookup_address_in_line_info_table
|
|
PARAMS ((struct line_info_table *, bfd_vma, struct funcinfo *,
|
|
const char **, unsigned int *));
|
|
static bfd_boolean lookup_address_in_function_table
|
|
PARAMS ((struct funcinfo *, bfd_vma, struct funcinfo **, const char **));
|
|
static bfd_boolean scan_unit_for_functions PARAMS ((struct comp_unit *));
|
|
static struct comp_unit *parse_comp_unit
|
|
PARAMS ((bfd *, struct dwarf2_debug *, bfd_vma, unsigned int));
|
|
static bfd_boolean comp_unit_contains_address
|
|
PARAMS ((struct comp_unit *, bfd_vma));
|
|
static bfd_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
|
|
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL,
|
|
stash->syms);
|
|
if (! stash->dwarf_abbrev_buffer)
|
|
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 says 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;
|
|
};
|
|
|
|
/* 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->line = line;
|
|
info->column = column;
|
|
info->end_sequence = end_sequence;
|
|
|
|
amt = strlen (filename);
|
|
if (amt)
|
|
{
|
|
info->filename = bfd_alloc (table->abfd, amt + 1);
|
|
if (info->filename)
|
|
strcpy (info->filename, filename);
|
|
}
|
|
else
|
|
info->filename = NULL;
|
|
}
|
|
|
|
/* Extract a fully qualified filename from a line info table.
|
|
The returned string has been malloc'ed and it is the caller's
|
|
responsibility to free it. */
|
|
|
|
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 strdup ("<unknown>");
|
|
}
|
|
|
|
filename = table->files[file - 1].name;
|
|
|
|
if (! IS_ABSOLUTE_PATH (filename))
|
|
{
|
|
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)
|
|
{
|
|
unsigned int len = strlen (dirname) + strlen (filename) + 2;
|
|
char * name;
|
|
|
|
name = bfd_malloc (len);
|
|
if (name)
|
|
sprintf (name, "%s/%s", dirname, filename);
|
|
return name;
|
|
}
|
|
}
|
|
|
|
return strdup (filename);
|
|
}
|
|
|
|
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
|
|
= bfd_simple_get_relocated_section_contents (abfd, msec, NULL,
|
|
stash->syms);
|
|
if (! stash->dwarf_line_buffer)
|
|
return 0;
|
|
}
|
|
|
|
/* 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;
|
|
if (filename)
|
|
free (filename);
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (filename)
|
|
free (filename);
|
|
}
|
|
|
|
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 bfd_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. */
|
|
bfd_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 bfd_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 bfd_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;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
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);
|
|
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 bfd_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 if UNIT contains ADDR, and no errors were encountered;
|
|
FALSE otherwise. */
|
|
|
|
static bfd_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;
|
|
{
|
|
bfd_boolean line_p;
|
|
bfd_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 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. */
|
|
|
|
bfd_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_simple_get_relocated_section_contents
|
|
(abfd, msec, stash->info_ptr + start, symbols)) == NULL)
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
bfd_boolean found;
|
|
unsigned int offset_size = addr_size;
|
|
|
|
length = read_4_bytes (abfd, stash->info_ptr);
|
|
/* A 0xffffff length is the DWARF3 way of indicating we use
|
|
64-bit offsets, instead of 32-bit offsets. */
|
|
if (length == 0xffffffff)
|
|
{
|
|
offset_size = 8;
|
|
length = read_8_bytes (abfd, stash->info_ptr + 4);
|
|
stash->info_ptr += 12;
|
|
}
|
|
/* A zero length is the IRIX way of indicating 64-bit offsets,
|
|
mostly because the 64-bit length will generally fit in 32
|
|
bits, and the endianness helps. */
|
|
else if (length == 0)
|
|
{
|
|
offset_size = 8;
|
|
length = read_4_bytes (abfd, stash->info_ptr + 4);
|
|
stash->info_ptr += 8;
|
|
}
|
|
/* In the absence of the hints above, we assume addr_size-sized
|
|
offsets, for backward-compatibility with pre-DWARF3 64-bit
|
|
platforms. */
|
|
else if (addr_size == 8)
|
|
{
|
|
length = read_8_bytes (abfd, stash->info_ptr);
|
|
stash->info_ptr = 8;
|
|
}
|
|
else
|
|
stash->info_ptr += 4;
|
|
|
|
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;
|
|
}
|