4 or 12 */
};
-/* The data in the .debug_line statement prologue looks like this. */
-struct line_head
+/* The line number information for a compilation unit (found in the
+ .debug_line section) begins with a "statement program header",
+ which contains the following information. */
+struct line_header
+{
+ unsigned int total_length;
+ unsigned short version;
+ unsigned int header_length;
+ unsigned char minimum_instruction_length;
+ unsigned char default_is_stmt;
+ int line_base;
+ unsigned char line_range;
+ unsigned char opcode_base;
+
+ /* standard_opcode_lengths[i] is the number of operands for the
+ standard opcode whose value is i. This means that
+ standard_opcode_lengths[0] is unused, and the last meaningful
+ element is standard_opcode_lengths[opcode_base - 1]. */
+ unsigned char *standard_opcode_lengths;
+
+ /* The include_directories table. NOTE! These strings are not
+ allocated with xmalloc; instead, they are pointers into
+ debug_line_buffer. If you try to free them, `free' will get
+ indigestion. */
+ unsigned int num_include_dirs, include_dirs_size;
+ char **include_dirs;
+
+ /* The file_names table. NOTE! These strings are not allocated
+ with xmalloc; instead, they are pointers into debug_line_buffer.
+ Don't try to free them directly. */
+ unsigned int num_file_names, file_names_size;
+ struct file_entry
{
- unsigned int total_length;
- unsigned short version;
- unsigned int 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;
- };
+ char *name;
+ unsigned int dir_index;
+ unsigned int mod_time;
+ unsigned int length;
+ } *file_names;
+
+ /* The start and end of the statement program following this
+ header. These point into dwarf_line_buffer. */
+ char *statement_program_start, *statement_program_end;
+};
/* When we construct a partial symbol table entry we only
need this much information. */
{
"missing .debug_line section", 0, 0
};
+static struct complaint dwarf2_statement_list_fits_in_line_number_section =
+{
+ "statement list doesn't fit in .debug_line section", 0, 0
+};
static struct complaint dwarf2_mangled_line_number_section =
{
"mangled .debug_line section", 0, 0
{
"misplaced first line number at 0x%lx for '%s'", 0, 0
};
+static struct complaint dwarf2_line_header_too_long =
+{
+ "line number info header doesn't fit in `.debug_line' section", 0, 0
+};
/* local function prototypes */
static int die_is_declaration (struct die_info *);
-static void dwarf_decode_lines (unsigned int, char *, bfd *,
+static void free_line_header (struct line_header *lh);
+
+static struct line_header *(dwarf_decode_line_header
+ (unsigned int offset,
+ bfd *abfd,
+ const struct comp_unit_head *cu_header));
+
+static void dwarf_decode_lines (struct line_header *, char *, bfd *,
const struct comp_unit_head *);
static void dwarf2_start_subfile (char *, char *);
read_file_scope (struct die_info *die, struct objfile *objfile,
const struct comp_unit_head *cu_header)
{
- unsigned int line_offset = 0;
+ struct cleanup *back_to = make_cleanup (null_cleanup, 0);
CORE_ADDR lowpc = ((CORE_ADDR) -1);
CORE_ADDR highpc = ((CORE_ADDR) 0);
struct attribute *attr;
char *comp_dir = NULL;
struct die_info *child_die;
bfd *abfd = objfile->obfd;
+ struct line_header *line_header = 0;
if (!dwarf2_get_pc_bounds (die, &lowpc, &highpc, objfile))
{
attr = dwarf_attr (die, DW_AT_stmt_list);
if (attr)
{
- line_offset = DW_UNSND (attr);
- dwarf_decode_lines (line_offset, comp_dir, abfd, cu_header);
+ unsigned int line_offset = DW_UNSND (attr);
+ line_header = dwarf_decode_line_header (line_offset,
+ abfd, cu_header);
+ if (line_header)
+ {
+ make_cleanup ((make_cleanup_ftype *) free_line_header,
+ (void *) line_header);
+ dwarf_decode_lines (line_header, comp_dir, abfd, cu_header);
+ }
}
+
+ do_cleanups (back_to);
}
static void
&& ! dwarf_attr (die, DW_AT_specification));
}
-/* Decode the line number information for the compilation unit whose
- line number info is at OFFSET in the .debug_line section.
- The compilation directory of the file is passed in COMP_DIR. */
-struct filenames
+/* Free the line_header structure *LH, and any arrays and strings it
+ refers to. */
+static void
+free_line_header (struct line_header *lh)
+{
+ if (lh->standard_opcode_lengths)
+ free (lh->standard_opcode_lengths);
+
+ /* Remember that all the lh->file_names[i].name pointers are
+ pointers into debug_line_buffer, and don't need to be freed. */
+ if (lh->file_names)
+ free (lh->file_names);
+
+ /* Similarly for the include directory names. */
+ if (lh->include_dirs)
+ free (lh->include_dirs);
+
+ free (lh);
+}
+
+
+/* Add an entry to LH's include directory table. */
+static void
+add_include_dir (struct line_header *lh, char *include_dir)
{
- unsigned int num_files;
- struct fileinfo
+ /* Grow the array if necessary. */
+ if (lh->include_dirs_size == 0)
{
- char *name;
- unsigned int dir;
- unsigned int time;
- unsigned int size;
+ lh->include_dirs_size = 1; /* for testing */
+ lh->include_dirs = xmalloc (lh->include_dirs_size
+ * sizeof (*lh->include_dirs));
+ }
+ else if (lh->num_include_dirs >= lh->include_dirs_size)
+ {
+ lh->include_dirs_size *= 2;
+ lh->include_dirs = xrealloc (lh->include_dirs,
+ (lh->include_dirs_size
+ * sizeof (*lh->include_dirs)));
}
- *files;
-};
-struct directories
- {
- unsigned int num_dirs;
- char **dirs;
- };
+ lh->include_dirs[lh->num_include_dirs++] = include_dir;
+}
+
+
+/* Add an entry to LH's file name table. */
+static void
+add_file_name (struct line_header *lh,
+ char *name,
+ unsigned int dir_index,
+ unsigned int mod_time,
+ unsigned int length)
+{
+ struct file_entry *fe;
+
+ /* Grow the array if necessary. */
+ if (lh->file_names_size == 0)
+ {
+ lh->file_names_size = 1; /* for testing */
+ lh->file_names = xmalloc (lh->file_names_size
+ * sizeof (*lh->file_names));
+ }
+ else if (lh->num_file_names >= lh->file_names_size)
+ {
+ lh->file_names_size *= 2;
+ lh->file_names = xrealloc (lh->file_names,
+ (lh->file_names_size
+ * sizeof (*lh->file_names)));
+ }
+
+ fe = &lh->file_names[lh->num_file_names++];
+ fe->name = name;
+ fe->dir_index = dir_index;
+ fe->mod_time = mod_time;
+ fe->length = length;
+}
+
+
+/* Read the statement program header starting at OFFSET in
+ dwarf_line_buffer, according to the endianness of ABFD. Return a
+ pointer to a struct line_header, allocated using xmalloc.
+
+ NOTE: the strings in the include directory and file name tables of
+ the returned object point into debug_line_buffer, and must not be
+ freed. */
+static struct line_header *
+dwarf_decode_line_header (unsigned int offset, bfd *abfd,
+ const struct comp_unit_head *cu_header)
+{
+ struct cleanup *back_to;
+ struct line_header *lh;
+ char *line_ptr;
+ int bytes_read;
+ int i;
+ char *cur_dir, *cur_file;
+
+ if (dwarf_line_buffer == NULL)
+ {
+ complain (&dwarf2_missing_line_number_section);
+ return 0;
+ }
+
+ /* Make sure that at least there's room for the total_length field. That
+ could be 12 bytes long, but we're just going to fudge that. */
+ if (offset + 4 >= dwarf_line_size)
+ {
+ complain (&dwarf2_statement_list_fits_in_line_number_section);
+ return 0;
+ }
+
+ lh = xmalloc (sizeof (*lh));
+ memset (lh, 0, sizeof (*lh));
+ back_to = make_cleanup ((make_cleanup_ftype *) free_line_header,
+ (void *) lh);
+
+ line_ptr = dwarf_line_buffer + offset;
+
+ /* read in the header */
+ lh->total_length = read_initial_length (abfd, line_ptr, NULL, &bytes_read);
+ line_ptr += bytes_read;
+ if (line_ptr + lh->total_length > dwarf_line_buffer + dwarf_line_size)
+ {
+ complain (&dwarf2_statement_list_fits_in_line_number_section);
+ return 0;
+ }
+ lh->statement_program_end = line_ptr + lh->total_length;
+ lh->version = read_2_bytes (abfd, line_ptr);
+ line_ptr += 2;
+ lh->header_length = read_offset (abfd, line_ptr, cu_header, &bytes_read);
+ line_ptr += bytes_read;
+ lh->minimum_instruction_length = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh->default_is_stmt = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh->line_base = read_1_signed_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh->line_range = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh->opcode_base = read_1_byte (abfd, line_ptr);
+ line_ptr += 1;
+ lh->standard_opcode_lengths
+ = (unsigned char *) xmalloc (lh->opcode_base * sizeof (unsigned char));
+
+ lh->standard_opcode_lengths[0] = 1; /* This should never be used anyway. */
+ 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;
+ add_include_dir (lh, cur_dir);
+ }
+ line_ptr += bytes_read;
+
+ /* Read file name table */
+ while ((cur_file = read_string (abfd, line_ptr, &bytes_read)) != NULL)
+ {
+ unsigned int dir_index, mod_time, length;
+
+ line_ptr += bytes_read;
+ dir_index = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ mod_time = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ length = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+
+ add_file_name (lh, cur_file, dir_index, mod_time, length);
+ }
+ line_ptr += bytes_read;
+ lh->statement_program_start = line_ptr;
+
+ if (line_ptr > dwarf_line_buffer + dwarf_line_size)
+ complain (&dwarf2_line_header_too_long);
+
+ discard_cleanups (back_to);
+ return lh;
+}
/* This function exists to work around a bug in certain compilers
(particularly GCC 2.95), in which the first line number marker of a
return fn->lowpc;
}
+/* Decode the line number information for the compilation unit whose
+ line number info is at OFFSET in the .debug_line section.
+ The compilation directory of the file is passed in COMP_DIR. */
+
static void
-dwarf_decode_lines (unsigned int offset, char *comp_dir, bfd *abfd,
+dwarf_decode_lines (struct line_header *lh, char *comp_dir, bfd *abfd,
const struct comp_unit_head *cu_header)
{
char *line_ptr;
char *line_end;
- struct line_head lh;
- struct cleanup *back_to;
unsigned int i, bytes_read;
- char *cur_file, *cur_dir;
+ char *cur_dir;
unsigned char op_code, extended_op, adj_opcode;
-#define FILE_ALLOC_CHUNK 5
-#define DIR_ALLOC_CHUNK 5
-
- struct filenames files;
- struct directories dirs;
-
- if (dwarf_line_buffer == NULL)
- {
- complain (&dwarf2_missing_line_number_section);
- return;
- }
-
- files.num_files = 0;
- files.files = NULL;
-
- dirs.num_dirs = 0;
- dirs.dirs = NULL;
-
- line_ptr = dwarf_line_buffer + offset;
-
- /* read in the prologue */
- lh.total_length = read_initial_length (abfd, line_ptr, NULL, &bytes_read);
- line_ptr += bytes_read;
- line_end = line_ptr + lh.total_length;
- lh.version = read_2_bytes (abfd, line_ptr);
- line_ptr += 2;
- lh.prologue_length = read_offset (abfd, line_ptr, cu_header, &bytes_read);
- line_ptr += bytes_read;
- lh.minimum_instruction_length = read_1_byte (abfd, line_ptr);
- line_ptr += 1;
- lh.default_is_stmt = read_1_byte (abfd, line_ptr);
- line_ptr += 1;
- lh.line_base = read_1_signed_byte (abfd, line_ptr);
- line_ptr += 1;
- lh.line_range = read_1_byte (abfd, line_ptr);
- line_ptr += 1;
- lh.opcode_base = read_1_byte (abfd, line_ptr);
- line_ptr += 1;
- lh.standard_opcode_lengths = (unsigned char *)
- xmalloc (lh.opcode_base * sizeof (unsigned char));
- back_to = make_cleanup (free_current_contents, &lh.standard_opcode_lengths);
-
- 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 ((dirs.num_dirs % DIR_ALLOC_CHUNK) == 0)
- {
- dirs.dirs = (char **)
- xrealloc (dirs.dirs,
- (dirs.num_dirs + DIR_ALLOC_CHUNK) * sizeof (char *));
- if (dirs.num_dirs == 0)
- make_cleanup (free_current_contents, &dirs.dirs);
- }
- dirs.dirs[dirs.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 ((files.num_files % FILE_ALLOC_CHUNK) == 0)
- {
- files.files = (struct fileinfo *)
- xrealloc (files.files,
- (files.num_files + FILE_ALLOC_CHUNK)
- * sizeof (struct fileinfo));
- if (files.num_files == 0)
- make_cleanup (free_current_contents, &files.files);
- }
- files.files[files.num_files].name = cur_file;
- files.files[files.num_files].dir =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.files[files.num_files].time =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.files[files.num_files].size =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.num_files++;
- }
- line_ptr += bytes_read;
+ line_ptr = lh->statement_program_start;
+ line_end = lh->statement_program_end;
/* Read the statement sequences until there's nothing left. */
while (line_ptr < line_end)
unsigned int file = 1;
unsigned int line = 1;
unsigned int column = 0;
- int is_stmt = lh.default_is_stmt;
+ int is_stmt = lh->default_is_stmt;
int basic_block = 0;
int end_sequence = 0;
/* Start a subfile for the current file of the state machine. */
- if (files.num_files >= file)
+ if (lh->num_file_names >= file)
{
- /* The file and directory tables are 0 based, the references
- are 1 based. */
- dwarf2_start_subfile (files.files[file - 1].name,
- (files.files[file - 1].dir
- ? dirs.dirs[files.files[file - 1].dir - 1]
- : comp_dir));
+ /* lh->include_dirs and lh->file_names are 0-based, but the
+ directory and file name numbers in the statement program
+ are 1-based. */
+ struct file_entry *fe = &lh->file_names[file - 1];
+ char *dir;
+ if (fe->dir_index)
+ dir = lh->include_dirs[fe->dir_index - 1];
+ else
+ dir = comp_dir;
+ dwarf2_start_subfile (fe->name, dir);
}
/* Decode the table. */
op_code = read_1_byte (abfd, line_ptr);
line_ptr += 1;
- if (op_code >= lh.opcode_base)
+ 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);
+ 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 */
address = check_cu_functions (address);
record_line (current_subfile, line, address);
address += baseaddr;
break;
case DW_LNE_define_file:
- cur_file = read_string (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- if ((files.num_files % FILE_ALLOC_CHUNK) == 0)
- {
- files.files = (struct fileinfo *)
- xrealloc (files.files,
- (files.num_files + FILE_ALLOC_CHUNK)
- * sizeof (struct fileinfo));
- if (files.num_files == 0)
- make_cleanup (free_current_contents, &files.files);
- }
- files.files[files.num_files].name = cur_file;
- files.files[files.num_files].dir =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.files[files.num_files].time =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.files[files.num_files].size =
- read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
- line_ptr += bytes_read;
- files.num_files++;
+ {
+ char *cur_file;
+ unsigned int dir_index, mod_time, length;
+
+ cur_file = read_string (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ dir_index =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ mod_time =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ length =
+ read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ add_file_name (lh, cur_file, dir_index, mod_time, length);
+ }
break;
default:
complain (&dwarf2_mangled_line_number_section);
- goto done;
+ return;
}
break;
case DW_LNS_copy:
basic_block = 0;
break;
case DW_LNS_advance_pc:
- address += lh.minimum_instruction_length
+ address += lh->minimum_instruction_length
* read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
break;
line_ptr += bytes_read;
break;
case DW_LNS_set_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;
- dwarf2_start_subfile
- (files.files[file - 1].name,
- (files.files[file - 1].dir
- ? dirs.dirs[files.files[file - 1].dir - 1]
- : comp_dir));
+ {
+ /* lh->include_dirs and lh->file_names are 0-based,
+ but the directory and file name numbers in the
+ statement program are 1-based. */
+ struct file_entry *fe;
+ char *dir;
+ file = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
+ line_ptr += bytes_read;
+ fe = &lh->file_names[file - 1];
+ if (fe->dir_index)
+ dir = lh->include_dirs[fe->dir_index - 1];
+ else
+ dir = comp_dir;
+ dwarf2_start_subfile (fe->name, dir);
+ }
break;
case DW_LNS_set_column:
column = read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
length since special opcode 255 would have scaled the
the increment. */
case DW_LNS_const_add_pc:
- address += (lh.minimum_instruction_length
- * ((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);
default:
{ /* Unknown standard opcode, ignore it. */
int i;
- for (i = 0; i < lh.standard_opcode_lengths[op_code]; i++)
+ for (i = 0; i < lh->standard_opcode_lengths[op_code]; i++)
{
(void) read_unsigned_leb128 (abfd, line_ptr, &bytes_read);
line_ptr += bytes_read;
}
}
}
-done:
- do_cleanups (back_to);
}
/* Start a subfile for DWARF. FILENAME is the name of the file and
projects / binutils-gdb.git / commitdiff