/* DWARF 2 support.
- Copyright 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright 1994, 95, 96, 97, 98, 99, 2000 Free Software Foundation, Inc.
Adapted from gdb/dwarf2read.c by Gavin Koch of Cygnus Solutions
(gavin@cygnus.com).
/* Length of the loaded .debug_abbrev section. */
unsigned long dwarf_abbrev_size;
+
+ /* Buffer for decode_line_info. */
+ char *dwarf_line_buffer;
};
+struct arange {
+ struct arange *next;
+ bfd_vma low;
+ bfd_vma high;
+};
/* A minimal decoding of DWARF2 compilation units. We only decode
/* The lowest and higest addresses contained in this compilation
unit as specified in the compilation unit header. */
- bfd_vma low;
- bfd_vma high;
+ struct arange arange;
/* The DW_AT_name attribute (for error messages). */
char* name;
static unsigned int
read_1_byte (abfd, buf)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
{
return bfd_get_8 (abfd, (bfd_byte *) buf);
static int
read_1_signed_byte (abfd, buf)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
{
return bfd_get_signed_8 (abfd, (bfd_byte *) buf);
static char *
read_n_bytes (abfd, buf, size)
- bfd * abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
- unsigned int size;
+ 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
static char *
read_string (abfd, buf, bytes_read_ptr)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int *bytes_read_ptr;
{
static unsigned int
read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
- bfd *abfd;
+ bfd *abfd ATTRIBUTE_UNUSED;
char *buf;
unsigned int *bytes_read_ptr;
{
static int
read_signed_leb128 (abfd, buf, bytes_read_ptr)
- bfd * abfd;
- char * buf;
+ bfd *abfd ATTRIBUTE_UNUSED;
+ char *buf;
unsigned int * bytes_read_ptr;
{
int result;
struct comp_unit* unit;
char *buf;
{
- bfd_vma retval = 0;
-
- if (unit->addr_size == 4)
+ switch (unit->addr_size)
{
- retval = bfd_get_32 (unit->abfd, (bfd_byte *) buf);
- } else {
- retval = bfd_get_64 (unit->abfd, (bfd_byte *) buf);
+ 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 ();
}
- return retval;
}
return 0;
}
- stash->dwarf_abbrev_size = bfd_get_section_size_before_reloc (msec);
+ stash->dwarf_abbrev_size = msec->_raw_size;
stash->dwarf_abbrev_buffer = (char*) bfd_alloc (abfd, stash->dwarf_abbrev_size);
if (! stash->dwarf_abbrev_buffer)
return 0;
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;
char* filename;
unsigned int line;
unsigned int column;
+ int end_sequence; /* end of (sequential) code sequence */
};
struct fileinfo {
};
static void
-add_line_info (table, address, filename, line, column)
+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;
{
struct line_info* info = (struct line_info*)
bfd_alloc (table->abfd, sizeof (struct line_info));
info->filename = filename;
info->line = line;
info->column = column;
+ info->end_sequence = end_sequence;
}
static char*
struct line_info_table* table;
unsigned int file;
{
- char* filename = table->files[file - 1].name;
+ 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 (*filename == '/')
return 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 = bfd_zalloc (unit->abfd, 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*
{
bfd *abfd = unit->abfd;
- static char* dwarf_line_buffer = 0;
+ struct dwarf2_debug *stash;
struct line_info_table* table;
char *cur_file, *cur_dir;
unsigned char op_code, extended_op, adj_opcode;
- if (! dwarf_line_buffer)
+ stash = elf_tdata (abfd)->dwarf2_find_line_info;
+
+ if (! stash->dwarf_line_buffer)
{
asection *msec;
unsigned long size;
return 0;
}
- size = bfd_get_section_size_before_reloc (msec);
- dwarf_line_buffer = (char*) bfd_alloc (abfd, size);
- if (! dwarf_line_buffer)
+ size = msec->_raw_size;
+ stash->dwarf_line_buffer = (char *) bfd_alloc (abfd, size);
+ if (! stash->dwarf_line_buffer)
return 0;
if (! bfd_get_section_contents (abfd, msec,
- dwarf_line_buffer, 0,
+ stash->dwarf_line_buffer, 0,
size))
return 0;
table->num_dirs = 0;
table->dirs = NULL;
- line_ptr = dwarf_line_buffer + unit->line_offset;
+ table->files = NULL;
+ table->last_line = NULL;
+
+ line_ptr = stash->dwarf_line_buffer + unit->line_offset;
/* read in the prologue */
lh.total_length = read_4_bytes (abfd, line_ptr);
unsigned int column = 0;
int is_stmt = lh.default_is_stmt;
int basic_block = 0;
- int end_sequence = 0;
+ int end_sequence = 0, need_low_pc = 1;
+ bfd_vma low_pc = 0;
/* Decode the table. */
while (! end_sequence)
{
case DW_LNE_end_sequence:
end_sequence = 1;
- add_line_info (table, address, filename, line, column);
+ add_line_info (table, address, filename, line, column,
+ end_sequence);
+ if (need_low_pc)
+ {
+ need_low_pc = 0;
+ low_pc = address;
+ }
+ arange_add (unit, low_pc, address);
break;
case DW_LNE_set_address:
address = read_address (unit, line_ptr);
}
break;
case DW_LNS_copy:
- add_line_info (table, address, filename, line, column);
+ add_line_info (table, address, filename, line, column, 0);
basic_block = 0;
+ if (need_low_pc)
+ {
+ need_low_pc = 0;
+ low_pc = address;
+ }
break;
case DW_LNS_advance_pc:
address += lh.minimum_instruction_length
basic_block = 1;
break;
case DW_LNS_const_add_pc:
- address += (255 - lh.opcode_base) / lh.line_range;
+ 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);
* 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);
+ add_line_info (table, address, filename, line, column, 0);
basic_block = 1;
+ if (need_low_pc)
+ {
+ need_low_pc = 0;
+ low_pc = address;
+ }
}
}
}
const char **filename_ptr;
unsigned int *linenumber_ptr;
{
+ struct line_info* next_line = table->last_line;
struct line_info* each_line;
- struct line_info* next_line;
- for (next_line = 0, each_line = table->last_line;
- each_line;
- next_line = each_line, each_line = each_line->prev_line)
+ if (!next_line)
+ return false;
+
+ each_line = next_line->prev_line;
+
+ while (each_line && next_line)
{
- if (addr >= each_line->address
- && (next_line == 0
- || addr < next_line->address))
+ if (!each_line->end_sequence
+ && addr >= each_line->address && addr < next_line->address)
{
*filename_ptr = each_line->filename;
*linenumber_ptr = each_line->line;
return true;
}
+ next_line = each_line;
+ each_line = each_line->prev_line;
}
return false;
-/* 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.
+/* 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.
+ If ABBREV_LENGTH is 0, then the length of the abbreviation offset
+ is assumed to be four bytes. Otherwise, it it is the size given.
This routine does not read the whole compilation unit; only enough
to get to the line number information for the compilation unit. */
static struct comp_unit *
-parse_comp_unit (abfd, info_ptr, end_ptr)
+parse_comp_unit (abfd, info_ptr, end_ptr, abbrev_length)
bfd* abfd;
char* info_ptr;
char* end_ptr;
+ unsigned int abbrev_length;
{
struct comp_unit* unit;
unsigned short version;
- unsigned int abbrev_offset;
+ unsigned int abbrev_offset = 0;
unsigned char addr_size;
struct abbrev_info** abbrevs;
version = read_2_bytes (abfd, info_ptr);
info_ptr += 2;
- abbrev_offset = read_4_bytes (abfd, info_ptr);
- info_ptr += 4;
+ BFD_ASSERT (abbrev_length == 0
+ || abbrev_length == 4
+ || abbrev_length == 8);
+ if (abbrev_length == 0 || abbrev_length == 4)
+ abbrev_offset = read_4_bytes (abfd, info_ptr);
+ else if (abbrev_length == 8)
+ abbrev_offset = read_8_bytes (abfd, info_ptr);
+ info_ptr += abbrev_length;
addr_size = read_1_byte (abfd, info_ptr);
info_ptr += 1;
return 0;
}
- if (addr_size != 4 && addr_size != 8)
+ 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 '4' and '8'.", addr_size );
+ (*_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;
}
break;
case DW_AT_low_pc:
- unit->low = DW_ADDR (&attr);
+ unit->arange.low = DW_ADDR (&attr);
break;
case DW_AT_high_pc:
- unit->high = DW_ADDR (&attr);
+ unit->arange.high = DW_ADDR (&attr);
break;
case DW_AT_comp_dir:
struct comp_unit* unit;
bfd_vma addr;
{
- return ! unit->error
- && (addr >= unit->low && addr <= unit->high);
+ struct arange *arange;
+
+ if (unit->error)
+ return 0;
+
+ arange = &unit->arange;
+ do
+ {
+ if (addr >= arange->low && addr < arange->high)
+ return 1;
+ arange = arange->next;
+ }
+ while (arange);
+ return 0;
}
return line_p || func_p;
}
-/* The DWARF2 version of find_nearest line.
- Return true if the line is found without error. */
+/* 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)
+ filename_ptr, functionname_ptr,
+ linenumber_ptr,
+ addr_size)
bfd *abfd;
asection *section;
- asymbol **symbols;
+ asymbol **symbols ATTRIBUTE_UNUSED;
bfd_vma offset;
const char **filename_ptr;
const char **functionname_ptr;
unsigned int *linenumber_ptr;
+ unsigned int addr_size;
{
/* Read each compilation unit from the section .debug_info, and check
to see if it contains the address we are searching for. If yes,
*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)
{
asection *msec;
return false;
}
- size = bfd_get_section_size_before_reloc (msec);
+ size = msec->_raw_size;
if (size == 0)
return false;
stash->info_ptr_end = stash->info_ptr + size;
- /* 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.
+ /* 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... */
+ 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
/* 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);
- }
+ if (comp_unit_contains_address (each, addr))
+ return comp_unit_find_nearest_line (each, addr, filename_ptr,
+ functionname_ptr, linenumber_ptr);
/* Read each remaining comp. units checking each as they are read. */
while (stash->info_ptr < stash->info_ptr_end)
{
struct comp_unit* each;
- unsigned int length;
+ bfd_vma length;
+ boolean found;
- length = read_4_bytes (abfd, stash->info_ptr);
- stash->info_ptr += 4;
+ if (addr_size == 4)
+ length = read_4_bytes (abfd, stash->info_ptr);
+ else
+ length = read_8_bytes (abfd, stash->info_ptr);
+ stash->info_ptr += addr_size;
if (length > 0)
{
each = parse_comp_unit (abfd, stash->info_ptr,
- stash->info_ptr + length);
+ stash->info_ptr + length,
+ addr_size);
stash->info_ptr += length;
if (each)
each->next_unit = stash->all_comp_units;
stash->all_comp_units = each;
- if (comp_unit_contains_address (each, addr))
- return comp_unit_find_nearest_line (each, addr,
- filename_ptr,
- functionname_ptr,
- linenumber_ptr);
+ /* 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);
+ }
+ else
+ {
+ found = comp_unit_find_nearest_line (each, addr,
+ filename_ptr,
+ functionname_ptr,
+ linenumber_ptr);
+ if (found)
+ return true;
+ }
}
}
}
projects / deliverable / binutils-gdb.git / blobdiff