388 lines
9.2 KiB
C
388 lines
9.2 KiB
C
/*** nm.c -- Describe symbol table of a rel file. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "getopt.h"
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#include "stab.gnu.h"
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#include <ranlib.h>
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PROTO(static boolean, display_file, (char *filename));
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PROTO(static boolean, do_one_rel_file, (bfd *file));
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PROTO(static unsigned int, filter_symbols, (bfd *file, asymbol **syms,
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unsigned long symcount));
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PROTO(static void, print_symbols, (bfd *file, asymbol **syms,
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unsigned long symcount));
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extern PROTO(int, (*sorters[2][2]), (char *x, char *y));
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PROTO(static void, print_symdef_entry, (bfd * abfd));
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/* Command options. */
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int external_only = 0; /* print external symbols only */
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int file_on_each_line = 0; /* print file name on each line */
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int no_sort = 0; /* don't sort; print syms in order found */
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int print_debug_syms = 0; /* print debugger-only symbols too */
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int print_armap = 0; /* describe __.SYMDEF data in archive files. */
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int reverse_sort = 0; /* sort in downward(alpha or numeric) order */
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int sort_numerically = 0; /* sort in numeric rather than alpha order */
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int undefined_only = 0; /* print undefined symbols only */
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boolean print_each_filename = false; /* Ick. Used in archives. */
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/* IMPORT */
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extern char *program_name;
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extern char *program_version;
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extern char *target;
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struct option long_options[] = {
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{"debug-syms", 0, &print_debug_syms, 1},
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{"extern-only", 0, &external_only, 1},
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{"no-sort", 0, &no_sort, 1},
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{"numeric-sort", 0, &sort_numerically, 1},
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{"print-armap", 0, &print_armap, 1},
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{"print-file-name", 0, &file_on_each_line, 1},
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{"reverse-sort", 0, &reverse_sort, 1},
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{"target", 2, NULL, NULL},
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{"undefined-only", 0, &undefined_only, 1},
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{0, 0, 0, 0}
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};
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/* Some error-reporting functions */
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void
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usage ()
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{
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fprintf(stderr, "nm %s\nUsage: %s [-agnoprsu] filename...\n",
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program_version, program_name);
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exit(0);
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}
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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int c; /* sez which option char */
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int ind = 0; /* used by getopt and ignored by us */
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extern int optind; /* steps thru options */
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program_name = *argv;
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while ((c = getopt_long(argc, argv, "agnoprsu", long_options, &ind)) != EOF) {
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switch (c) {
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case 'a': print_debug_syms = 1; break;
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case 'g': external_only = 1; break;
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case 'n': sort_numerically = 1; break;
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case 'o': file_on_each_line = 1; break;
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case 'p': no_sort = 1; break;
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case 'r': reverse_sort = 1; break;
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case 's': print_armap = 1; break;
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case 'u': undefined_only = 1; break;
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case 0:
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if (!strcmp("target",(long_options[option_index]).name)) {
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target = optarg;
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}
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break; /* we've been given a long option */
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default:
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usage ();
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}
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}
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/* Strangely, for the shell you should return only a nonzero value
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on sucess -- the inverse of the C sense. */
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/* OK, all options now parsed. If no filename specified, do a.out. */
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if (optind == argc) return !display_file ("a.out");
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/* We were given several filenames to do: */
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while (optind < argc)
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if (!display_file (argv[optind++])) return 1;
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return 0;
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}
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/** Display a file's stats */
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/* goto here is marginally cleaner than the nested if syntax */
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static boolean
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display_file (filename)
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char *filename;
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{
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boolean retval = false;
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bfd *file;
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bfd *arfile = NULL;
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file = bfd_openr(filename, target);
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if (file == NULL) {
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bfd_fatal (filename);
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}
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if (bfd_check_format(file, bfd_object)) {
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retval = do_one_rel_file (file);
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goto closer;
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}
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if (!bfd_check_format (file, bfd_archive)) {
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fprintf (stderr, "%s: %s: unknown format.\n", program_name, filename);
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retval = false;
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goto closer;
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}
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printf("In archive %s:\n", filename);
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if (print_armap) print_symdef_entry (file);
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for (;;) {
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arfile = bfd_openr_next_archived_file (file, arfile);
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if (arfile == NULL) {
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if (bfd_error != no_more_archived_files)
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bfd_fatal (filename);
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goto closer;
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}
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if (!bfd_check_format(arfile, bfd_object))
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printf("%s: not an object file\n", arfile->filename);
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else {
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printf ("\n%s:\n", arfile->filename);
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if (!do_one_rel_file (arfile)) return false;
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}
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}
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closer:
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if (bfd_close(file) == false)
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bfd_fatal (filename);
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return retval;
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}
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static boolean
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do_one_rel_file (abfd)
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bfd *abfd;
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{
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unsigned int storage;
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asymbol **syms;
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unsigned int symcount = 0;
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if (!(bfd_get_file_flags (abfd) & HAS_SYMS)) {
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(void) printf ("No symbols in \"%s\".\n", bfd_get_filename (abfd));
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return true;
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}
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storage = get_symtab_upper_bound (abfd);
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if (storage == 0) {
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nosymz:
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fprintf (stderr, "%s: Symflags set but there are none?\n",
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bfd_get_filename (abfd));
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exit (1);
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}
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syms = (asymbol **) xmalloc (storage);
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symcount = bfd_canonicalize_symtab (abfd, syms);
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if (symcount == 0) goto nosymz;
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/* Discard the symbols we don't want to print.
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It's OK to do this in place; we'll free the storage anyway
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(after printing) */
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symcount = filter_symbols (abfd, syms, symcount);
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if (!no_sort)
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qsort((char *) syms, symcount, sizeof (asymbol *),
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sorters[sort_numerically][reverse_sort]);
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if (print_each_filename && !file_on_each_line)
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printf("\n%s:\n", bfd_get_filename(abfd));
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print_symbols (abfd, syms, symcount);
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free (syms);
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return true;
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}
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/* Symbol-sorting predicates */
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#define valueof(x) ((x)->section ? (x)->section->vma + (x)->value : (x)->value)
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int
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numeric_forward (x, y)
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char *x;
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char *y;
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{
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return (valueof(*(asymbol **)x) - valueof(*(asymbol **) y));;
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}
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int
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numeric_reverse (x, y)
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char *x;
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char *y;
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{
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return (valueof(*(asymbol **)y) - valueof(*(asymbol **) x));
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}
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int
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non_numeric_forward (x, y)
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char *x;
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char *y;
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{
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char *xn = (*(asymbol **) x)->name;
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char *yn = (*(asymbol **) y)->name;
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return ((xn == NULL) ? ((yn == NULL) ? 0 : -1) :
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((yn == NULL) ? 1 : strcmp (xn, yn)));
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}
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int
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non_numeric_reverse (x, y)
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char *x;
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char *y;
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{
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return -(non_numeric_forward (x, y));
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}
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int (*sorters[2][2])() = {
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{non_numeric_forward, non_numeric_reverse},
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{numeric_forward, numeric_reverse},
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};
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/* Choose which symbol entries to print;
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compact them downward to get rid of the rest.
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Return the number of symbols to be printed. */
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static unsigned int
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filter_symbols (abfd, syms, symcount)
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bfd *abfd;
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asymbol **syms;
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unsigned long symcount;
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{
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asymbol **from, **to;
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unsigned int dst_count = 0;
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unsigned int src_count;
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for (from = to = syms, src_count = 0; src_count <symcount; src_count++) {
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int keep = 0;
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flagword flags = (from[src_count])->flags;
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if (undefined_only) {
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keep = (flags & BSF_UNDEFINED);
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} else if (external_only) {
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keep = ((flags & BSF_GLOBAL) || (flags & BSF_UNDEFINED) ||
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(flags & BSF_FORT_COMM));
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} else {
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keep = 1;
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}
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if (!print_debug_syms && ((flags & BSF_DEBUGGING) != 0)) {
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keep = 0;
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}
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if (keep) {
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to[dst_count++] = from[src_count];
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}
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}
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return dst_count;
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}
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/* Return a lower-case character corresponding to the symbol class of sym */
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char
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decode_symclass (sym)
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asymbol *sym;
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{
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flagword flags = sym->flags;
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if ((sym->value == 0) && (sym->section != NULL))
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/* Huh? All section names don't begin with "." */
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return (sym->section->name)[1];
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if (flags & BSF_FORT_COMM) return 'C';
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if (flags & BSF_UNDEFINED) return 'U';
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if (flags & BSF_ABSOLUTE) return 'a';
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if ( (flags & BSF_GLOBAL) || (flags & BSF_LOCAL) ){
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if ( !strcmp(sym->section->name, ".text") ){
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return 't';
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} else if ( !strcmp(sym->section->name, ".data") ){
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return 'd';
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} else if ( !strcmp(sym->section->name, ".bss") ){
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return 'b';
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} else {
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return 'o';
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}
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}
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/* We don't have to handle these cases just yet, but we will soon:
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N_SETV: 'v';
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N_SETA: 'l';
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N_SETT: 'x';
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N_SETD: 'z';
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N_SETB: 's';
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N_INDR: 'i';
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*/
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return '?';
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}
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static void
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print_symbols (abfd, syms, symcount)
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bfd *abfd;
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asymbol **syms;
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unsigned long symcount;
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{
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asymbol **sym = syms, **end = syms + symcount;
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char class;
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for (; sym < end; ++sym) {
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if (file_on_each_line) printf("%s:", bfd_get_filename(abfd));
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if (undefined_only) {
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if ((*sym)->flags & BSF_UNDEFINED)
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puts ((*sym)->name);
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}
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else {
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asymbol *p = *sym;
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if (p) {
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class = decode_symclass (p);
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if (p->flags & BSF_GLOBAL)
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class = toupper (class);
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if (p->value || ((p->flags & BSF_UNDEFINED) != BSF_UNDEFINED))
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printf ("%08lx ", (p->section ? p->value + p->section->vma : p->value));
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else fputs (" ", stdout);
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printf ("%c %s\n", class, p->name);
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}
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}
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}
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}
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static void
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print_symdef_entry (abfd)
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bfd * abfd;
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{
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symindex idx = BFD_NO_MORE_SYMBOLS;
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carsym *thesym;
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boolean everprinted = false;
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for (idx = bfd_get_next_mapent (abfd, idx, &thesym);
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idx != BFD_NO_MORE_SYMBOLS;
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idx = bfd_get_next_mapent (abfd, idx, &thesym)) {
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bfd *elt;
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if (!everprinted) {
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printf ("\nArchive index:\n");
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everprinted = true;
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}
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elt = bfd_get_elt_at_index (abfd, idx);
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if (thesym->name != (char *)NULL) {
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printf ("%s in %s\n", thesym->name, bfd_get_filename (elt));
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}
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}
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}
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