3923b0019c
lib.c:
Pull in archives containing definitions needed by shared objects.
warnings.c:
Less spurious "undefined symbol" msgs for shared library defined
symbols.
ld.c:
Do a better job of recognising data in text segments, eg. `const char []'.
shlib.c,ld/rtld/{Makefile rtld.c}
Use strsep() in stead of strtok() and restore colons in eg. env. vars.
756 lines
19 KiB
C
756 lines
19 KiB
C
/*
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* $Id: warnings.c,v 1.4 1993/11/05 12:45:25 pk Exp $
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*/
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#include <sys/param.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <ar.h>
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#include <ranlib.h>
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#include <a.out.h>
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#include <stab.h>
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#include <string.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "ld.h"
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/*
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* Print the filename of ENTRY on OUTFILE (a stdio stream),
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* and then a newline.
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*/
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void
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prline_file_name (entry, outfile)
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struct file_entry *entry;
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FILE *outfile;
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{
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print_file_name (entry, outfile);
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fprintf (outfile, "\n");
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}
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/*
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* Print the filename of ENTRY on OUTFILE (a stdio stream).
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*/
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void
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print_file_name (entry, outfile)
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struct file_entry *entry;
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FILE *outfile;
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{
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if (entry->superfile) {
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print_file_name (entry->superfile, outfile);
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fprintf (outfile, "(%s)", entry->filename);
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} else
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fprintf (outfile, "%s", entry->filename);
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}
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/*
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* Return the filename of entry as a string (malloc'd for the purpose)
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*/
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char *
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get_file_name (entry)
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struct file_entry *entry;
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{
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char *result, *supfile;
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if (entry->superfile) {
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supfile = get_file_name (entry->superfile);
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result = (char *) xmalloc (strlen(supfile)
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+ strlen(entry->filename) + 3);
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sprintf (result, "%s(%s)", supfile, entry->filename);
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free (supfile);
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} else {
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result = (char *) xmalloc (strlen (entry->filename) + 1);
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strcpy (result, entry->filename);
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}
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return result;
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}
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/*
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* Report a fatal error. The error message is STRING followed by the
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* filename of ENTRY.
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*/
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void
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#if __STDC__
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fatal_with_file (char *fmt, struct file_entry *entry, ...)
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#else
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fatal_with_file (fmt, entry, va_alist)
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char *fmt;
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struct file_entry *entry;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "%s: ", progname);
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(void)vfprintf(stderr, fmt, ap);
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print_file_name (entry, stderr);
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(void)fprintf(stderr, "\n");
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va_end(ap);
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exit (1);
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}
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/*
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* Report a fatal error using the message for the last failed system call,
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* followed by the string NAME.
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*/
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void
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perror_name (name)
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char *name;
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{
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extern int errno, sys_nerr;
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extern char *sys_errlist[];
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char *s;
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if (errno < sys_nerr)
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s = concat ("", sys_errlist[errno], " for %s");
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else
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s = "cannot open %s";
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fatal (s, name);
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}
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/*
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* Report a fatal error using the message for the last failed system call,
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* followed by the name of file ENTRY.
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*/
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void
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perror_file (entry)
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struct file_entry *entry;
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{
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extern int errno, sys_nerr;
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extern char *sys_errlist[];
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char *s;
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if (errno < sys_nerr)
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s = concat ("", sys_errlist[errno], " for ");
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else
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s = "cannot open ";
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fatal_with_file (s, entry);
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}
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/* Print a complete or partial map of the output file. */
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static void describe_file_sections __P((struct file_entry *, FILE *));
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static void list_file_locals __P((struct file_entry *, FILE *));
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void
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print_symbols(outfile)
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FILE *outfile;
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{
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register int i;
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fprintf(outfile, "\nFiles:\n\n");
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each_file(describe_file_sections, outfile);
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fprintf(outfile, "\nGlobal symbols:\n\n");
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for (i = 0; i < TABSIZE; i++) {
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register symbol *sp;
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for (sp = symtab[i]; sp; sp = sp->link) {
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if (sp->defined == 1)
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fprintf(outfile, " %s: common, length %#x\n",
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sp->name, sp->max_common_size);
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if ( sp->referenced) {
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if (sp->defined)
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fprintf(outfile, " %s: %#x %#x\n",
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sp->name, sp->value, sp->size);
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else
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fprintf(outfile, " %s: undefined\n",
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sp->name);
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} else
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fprintf(outfile, " %s: unreferenced\n",
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sp->name);
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}
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}
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each_file(list_file_locals, outfile);
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}
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static void
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describe_file_sections(entry, outfile)
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struct file_entry *entry;
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FILE *outfile;
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{
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fprintf(outfile, " ");
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print_file_name(entry, outfile);
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if (entry->just_syms_flag)
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fprintf(outfile, " symbols only\n", 0);
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else
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fprintf(outfile, " text %x(%x), data %x(%x), bss %x(%x) hex\n",
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entry->text_start_address, entry->header.a_text,
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entry->data_start_address, entry->header.a_data,
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entry->bss_start_address, entry->header.a_bss);
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}
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static void
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list_file_locals (entry, outfile)
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struct file_entry *entry;
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FILE *outfile;
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{
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struct localsymbol *lsp, *lspend;
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entry->strings = (char *) alloca (entry->string_size);
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read_entry_strings (file_open (entry), entry);
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fprintf (outfile, "\nLocal symbols of ");
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print_file_name (entry, outfile);
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fprintf (outfile, ":\n\n");
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lspend = entry->symbols + entry->nsymbols;
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for (lsp = entry->symbols; lsp < lspend; lsp++) {
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register struct nlist *p = &lsp->nzlist.nlist;
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/*
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* If this is a definition,
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* update it if necessary by this file's start address.
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*/
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if (!(p->n_type & (N_STAB | N_EXT)))
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fprintf(outfile, " %s: 0x%x\n",
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entry->strings + p->n_un.n_strx, p->n_value);
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}
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entry->strings = 0; /* All done with them. */
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}
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/* Static vars for do_warnings and subroutines of it */
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static int list_unresolved_refs; /* List unresolved refs */
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static int list_warning_symbols; /* List warning syms */
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static int list_multiple_defs; /* List multiple definitions */
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static struct line_debug_entry *init_debug_scan __P((int, struct file_entry *));
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static int next_debug_entry __P((int, struct line_debug_entry *));
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/*
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* Structure for communication between do_file_warnings and it's
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* helper routines. Will in practice be an array of three of these:
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* 0) Current line, 1) Next line, 2) Source file info.
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*/
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struct line_debug_entry
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{
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int line;
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char *filename;
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struct localsymbol *sym;
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};
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/*
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* Helper routines for do_file_warnings.
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*/
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/* Return an integer less than, equal to, or greater than 0 as per the
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relation between the two relocation entries. Used by qsort. */
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static int
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relocation_entries_relation (rel1, rel2)
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struct relocation_info *rel1, *rel2;
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{
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return RELOC_ADDRESS(rel1) - RELOC_ADDRESS(rel2);
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}
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/* Moves to the next debugging symbol in the file. USE_DATA_SYMBOLS
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determines the type of the debugging symbol to look for (DSLINE or
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SLINE). STATE_POINTER keeps track of the old and new locatiosn in
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the file. It assumes that state_pointer[1] is valid; ie
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that it.sym points into some entry in the symbol table. If
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state_pointer[1].sym == 0, this routine should not be called. */
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static int
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next_debug_entry (use_data_symbols, state_pointer)
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register int use_data_symbols;
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/* Next must be passed by reference! */
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struct line_debug_entry state_pointer[3];
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{
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register struct line_debug_entry
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*current = state_pointer,
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*next = state_pointer + 1,
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/* Used to store source file */
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*source = state_pointer + 2;
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struct file_entry *entry = (struct file_entry *) source->sym;
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struct localsymbol *endp = entry->symbols + entry->nsymbols;
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current->sym = next->sym;
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current->line = next->line;
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current->filename = next->filename;
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while (++(next->sym) < endp) {
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struct nlist *np = &next->sym->nzlist.nlist;
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/*
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* n_type is a char, and N_SOL, N_EINCL and N_BINCL are > 0x80,
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* so may look negative...therefore, must mask to low bits
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*/
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switch (np->n_type & 0xff) {
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case N_SLINE:
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if (use_data_symbols) continue;
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next->line = np->n_desc;
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return 1;
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case N_DSLINE:
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if (!use_data_symbols) continue;
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next->line = np->n_desc;
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return 1;
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#ifdef HAVE_SUN_STABS
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case N_EINCL:
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next->filename = source->filename;
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continue;
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#endif
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case N_SO:
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source->filename = np->n_un.n_strx + entry->strings;
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source->line++;
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#ifdef HAVE_SUN_STABS
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case N_BINCL:
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#endif
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case N_SOL:
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next->filename = np->n_un.n_strx + entry->strings;
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default:
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continue;
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}
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}
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next->sym = (struct localsymbol *)0;
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return 0;
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}
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/*
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* Create a structure to save the state of a scan through the debug symbols.
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* USE_DATA_SYMBOLS is set if we should be scanning for DSLINE's instead of
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* SLINE's. entry is the file entry which points at the symbols to use.
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*/
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static struct line_debug_entry *
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init_debug_scan(use_data_symbols, entry)
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int use_data_symbols;
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struct file_entry *entry;
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{
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struct localsymbol *lsp;
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struct line_debug_entry *state_pointer = (struct line_debug_entry *)
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xmalloc(3 * sizeof(struct line_debug_entry));
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register struct line_debug_entry
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*current = state_pointer,
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*next = state_pointer + 1,
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*source = state_pointer + 2; /* Used to store source file */
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for (lsp = entry->symbols; lsp < entry->symbols+entry->nsymbols; lsp++)
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if (lsp->nzlist.nlist.n_type == N_SO)
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break;
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if (lsp >= entry->symbols + entry->nsymbols) {
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/* I believe this translates to "We lose" */
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current->filename = next->filename = entry->filename;
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current->line = next->line = -1;
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current->sym = next->sym = (struct localsymbol *) 0;
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return state_pointer;
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}
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next->line = source->line = 0;
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next->filename = source->filename
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= (lsp->nzlist.nlist.n_un.n_strx + entry->strings);
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source->sym = (struct localsymbol *) entry;
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next->sym = lsp;
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/* To setup next */
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next_debug_entry(use_data_symbols, state_pointer);
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if (!next->sym) { /* No line numbers for this section; */
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/* setup output results as appropriate */
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if (source->line) {
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current->filename = source->filename = entry->filename;
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current->line = -1; /* Don't print lineno */
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} else {
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current->filename = source->filename;
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current->line = 0;
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}
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return state_pointer;
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}
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/* To setup current */
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next_debug_entry(use_data_symbols, state_pointer);
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return state_pointer;
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}
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/*
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* Takes an ADDRESS (in either text or data space) and a STATE_POINTER which
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* describes the current location in the implied scan through the debug
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* symbols within the file which ADDRESS is within, and returns the source
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* line number which corresponds to ADDRESS.
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*/
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static int
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address_to_line(address, state_pointer)
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unsigned long address;
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/* Next must be passed by reference! */
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struct line_debug_entry state_pointer[3];
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{
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struct line_debug_entry
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*current = state_pointer, *next = state_pointer + 1;
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struct line_debug_entry *tmp_pointer;
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int use_data_symbols;
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if (next->sym)
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use_data_symbols =
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(next->sym->nzlist.nlist.n_type & N_TYPE) == N_DATA;
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else
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return current->line;
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/* Go back to the beginning if we've already passed it. */
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if (current->sym->nzlist.nlist.n_value > address) {
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tmp_pointer = init_debug_scan(use_data_symbols,
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(struct file_entry *)
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((state_pointer + 2)->sym));
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state_pointer[0] = tmp_pointer[0];
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state_pointer[1] = tmp_pointer[1];
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state_pointer[2] = tmp_pointer[2];
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free(tmp_pointer);
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}
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/* If we're still in a bad way, return -1, meaning invalid line. */
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if (current->sym->nzlist.nlist.n_value > address)
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return -1;
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while (next->sym
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&& next->sym->nzlist.nlist.n_value <= address
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&& next_debug_entry(use_data_symbols, state_pointer));
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return current->line;
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}
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/* Macros for manipulating bitvectors. */
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#define BIT_SET_P(bv, index) ((bv)[(index) >> 3] & 1 << ((index) & 0x7))
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#define SET_BIT(bv, index) ((bv)[(index) >> 3] |= 1 << ((index) & 0x7))
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/*
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* This routine will scan through the relocation data of file ENTRY, printing
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* out references to undefined symbols and references to symbols defined in
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* files with N_WARNING symbols. If DATA_SEGMENT is non-zero, it will scan
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* the data relocation segment (and use N_DSLINE symbols to track line
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* number); otherwise it will scan the text relocation segment. Warnings
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* will be printed on the output stream OUTFILE. Eventually, every nlist
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* symbol mapped through will be marked in the NLIST_BITVECTOR, so we don't
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* repeat ourselves when we scan the nlists themselves.
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*/
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static void
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do_relocation_warnings(entry, data_segment, outfile, nlist_bitvector)
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struct file_entry *entry;
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int data_segment;
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FILE *outfile;
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unsigned char *nlist_bitvector;
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{
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struct relocation_info *reloc, *reloc_start =
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data_segment ? entry->datarel : entry->textrel;
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int reloc_size = (data_segment ? entry->ndatarel : entry->ntextrel);
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int start_of_segment = (data_segment ?
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entry->data_start_address :
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entry->text_start_address);
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struct localsymbol *start_of_syms = entry->symbols;
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struct line_debug_entry *state_pointer =
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init_debug_scan(data_segment != 0, entry);
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register struct line_debug_entry *current = state_pointer;
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/* Assigned to generally static values; should not be written into. */
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char *errfmt;
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/*
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* Assigned to alloca'd values cand copied into; should be freed when
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* done.
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*/
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char *errmsg;
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int invalidate_line_number;
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/*
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* We need to sort the relocation info here. Sheesh, so much effort
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* for one lousy error optimization.
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*/
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qsort(reloc_start, reloc_size, sizeof(struct relocation_info),
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relocation_entries_relation);
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for (reloc = reloc_start;
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reloc < (reloc_start + reloc_size);
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reloc++) {
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register struct localsymbol *s;
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register symbol *g;
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/*
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* If the relocation isn't resolved through a symbol,
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* continue
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*/
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if (!RELOC_EXTERN_P(reloc))
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continue;
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s = &entry->symbols[RELOC_SYMBOL(reloc)];
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/*
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* Local symbols shouldn't ever be used by relocation info,
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* so the next should be safe. This is, of course, wrong.
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* References to local BSS symbols can be the targets of
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* relocation info, and they can (must) be resolved through
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* symbols. However, these must be defined properly, (the
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* assembler would have caught it otherwise), so we can
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* ignore these cases.
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*/
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if (!(s->nzlist.nz_type & N_EXT))
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continue;
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g = s->symbol;
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errmsg = 0;
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if (!g->defined && !g->so_defined && list_unresolved_refs) { /* Reference */
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/* Mark as being noted by relocation warning pass. */
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SET_BIT(nlist_bitvector, s - start_of_syms);
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if (g->undef_refs >= MAX_UREFS_PRINTED) /* Listed too many */
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continue;
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/* Undefined symbol which we should mention */
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|
||
if (++(g->undef_refs) == MAX_UREFS_PRINTED) {
|
||
errfmt = "More undefined symbol %s refs follow";
|
||
invalidate_line_number = 1;
|
||
} else {
|
||
errfmt = "Undefined symbol %s referenced from %s segment";
|
||
invalidate_line_number = 0;
|
||
}
|
||
} else { /* Defined */
|
||
/* Potential symbol warning here */
|
||
if (!g->warning)
|
||
continue;
|
||
|
||
/* Mark as being noted by relocation warning pass. */
|
||
SET_BIT(nlist_bitvector, s - start_of_syms);
|
||
|
||
errfmt = 0;
|
||
errmsg = g->warning;
|
||
invalidate_line_number = 0;
|
||
}
|
||
|
||
|
||
/* If errfmt == 0, errmsg has already been defined. */
|
||
if (errfmt != 0) {
|
||
char *nm;
|
||
|
||
nm = g->name;
|
||
errmsg = (char *) xmalloc(strlen(errfmt) + strlen(nm) + 1);
|
||
sprintf(errmsg, errfmt, nm, data_segment ? "data" : "text");
|
||
if (nm != g->name)
|
||
free(nm);
|
||
}
|
||
address_to_line(RELOC_ADDRESS(reloc) + start_of_segment,
|
||
state_pointer);
|
||
|
||
if (current->line >= 0)
|
||
fprintf(outfile, "%s:%d: %s\n", current->filename,
|
||
invalidate_line_number ? 0 : current->line, errmsg);
|
||
else
|
||
fprintf(outfile, "%s: %s\n", current->filename, errmsg);
|
||
|
||
if (errfmt != 0)
|
||
free(errmsg);
|
||
}
|
||
|
||
free(state_pointer);
|
||
}
|
||
|
||
/*
|
||
* Print on OUTFILE a list of all warnings generated by references and/or
|
||
* definitions in the file ENTRY. List source file and line number if
|
||
* possible, just the .o file if not.
|
||
*/
|
||
|
||
void
|
||
do_file_warnings (entry, outfile)
|
||
struct file_entry *entry;
|
||
FILE *outfile;
|
||
{
|
||
int number_of_syms = entry->nsymbols;
|
||
unsigned char *nlist_bitvector = (unsigned char *)
|
||
alloca ((number_of_syms >> 3) + 1);
|
||
struct line_debug_entry *text_scan, *data_scan;
|
||
int i;
|
||
char *errfmt, *file_name;
|
||
int line_number;
|
||
int dont_allow_symbol_name;
|
||
|
||
bzero (nlist_bitvector, (number_of_syms >> 3) + 1);
|
||
|
||
/* Read in the files strings if they aren't available */
|
||
if (!entry->strings) {
|
||
int desc;
|
||
|
||
entry->strings = (char *) alloca (entry->string_size);
|
||
desc = file_open (entry);
|
||
read_entry_strings (desc, entry);
|
||
}
|
||
|
||
if (! entry->is_dynamic) {
|
||
/* Do text warnings based on a scan through the relocation info. */
|
||
do_relocation_warnings (entry, 0, outfile, nlist_bitvector);
|
||
|
||
/* Do data warnings based on a scan through the relocation info. */
|
||
do_relocation_warnings (entry, 1, outfile, nlist_bitvector);
|
||
}
|
||
|
||
/* Scan through all of the nlist entries in this file and pick up
|
||
anything that the scan through the relocation stuff didn't. */
|
||
|
||
text_scan = init_debug_scan (0, entry);
|
||
data_scan = init_debug_scan (1, entry);
|
||
|
||
for (i = 0; i < number_of_syms; i++) {
|
||
struct nlist *s;
|
||
struct glosym *g;
|
||
|
||
g = entry->symbols[i].symbol;
|
||
s = &entry->symbols[i].nzlist.nlist;
|
||
|
||
if (!(s->n_type & N_EXT))
|
||
continue;
|
||
|
||
if (!g->referenced) {
|
||
#if 0
|
||
/* Check for undefined shobj symbols */
|
||
struct localsymbol *lsp;
|
||
register int type;
|
||
|
||
for (lsp = g->dynrefs; lsp; lsp = lsp->next) {
|
||
type = lsp->nlist.n_type;
|
||
if ((type & N_EXT) &&
|
||
type != (N_UNDF | N_EXT)) {
|
||
break;
|
||
}
|
||
}
|
||
if (type == (N_UNDF | N_EXT)) {
|
||
fprintf(stderr,
|
||
"Undefined symbol %s referenced from %s\n",
|
||
g->name,
|
||
get_file_name(entry));
|
||
}
|
||
#endif
|
||
continue;
|
||
}
|
||
|
||
if (undefined_global_sym_count == 0)
|
||
/* No undefined symbols in rel files */
|
||
continue;
|
||
|
||
dont_allow_symbol_name = 0;
|
||
|
||
if (list_multiple_defs && g->multiply_defined) {
|
||
errfmt = "Definition of symbol %s (multiply defined)";
|
||
switch (s->n_type) {
|
||
case N_TEXT | N_EXT:
|
||
line_number = address_to_line (s->n_value, text_scan);
|
||
file_name = text_scan[0].filename;
|
||
break;
|
||
case N_DATA | N_EXT:
|
||
line_number = address_to_line (s->n_value, data_scan);
|
||
file_name = data_scan[0].filename;
|
||
break;
|
||
#if 0
|
||
case N_SETA | N_EXT:
|
||
case N_SETT | N_EXT:
|
||
case N_SETD | N_EXT:
|
||
case N_SETB | N_EXT:
|
||
if (g->multiply_defined == 2)
|
||
continue;
|
||
errfmt = "First set element definition of symbol %s (multiply defined)";
|
||
break;
|
||
#endif
|
||
default:
|
||
/* Don't print out multiple defs
|
||
at references.*/
|
||
continue;
|
||
}
|
||
|
||
} else if (BIT_SET_P (nlist_bitvector, i))
|
||
continue;
|
||
else if (list_unresolved_refs && !g->defined && !g->so_defined) {
|
||
if (g->undef_refs >= MAX_UREFS_PRINTED)
|
||
continue;
|
||
|
||
if (++(g->undef_refs) == MAX_UREFS_PRINTED)
|
||
errfmt = "More undefined \"%s\" refs follow";
|
||
else
|
||
errfmt = "Undefined symbol \"%s\" referenced";
|
||
line_number = -1;
|
||
} else if (g->warning) {
|
||
/*
|
||
* There are two cases in which we don't want to do
|
||
* this. The first is if this is a definition instead
|
||
* do a reference. The second is if it's the reference
|
||
* used by the warning stabs itself.
|
||
*/
|
||
if (s->n_type != (N_EXT | N_UNDF)
|
||
|| (i && (s-1)->n_type == N_WARNING))
|
||
continue;
|
||
|
||
errfmt = g->warning;
|
||
line_number = -1;
|
||
dont_allow_symbol_name = 1;
|
||
} else
|
||
continue;
|
||
|
||
if (line_number == -1)
|
||
fprintf (outfile, "%s: ", entry->filename);
|
||
else
|
||
fprintf (outfile, "%s:%d: ", file_name, line_number);
|
||
|
||
if (dont_allow_symbol_name)
|
||
fprintf (outfile, "%s", errfmt);
|
||
else
|
||
fprintf (outfile, errfmt, g->name);
|
||
|
||
fputc ('\n', outfile);
|
||
}
|
||
free (text_scan);
|
||
free (data_scan);
|
||
entry->strings = 0; /* Since it will dissapear anyway. */
|
||
}
|
||
|
||
int
|
||
do_warnings(outfile)
|
||
FILE *outfile;
|
||
{
|
||
list_unresolved_refs = !relocatable_output &&
|
||
(undefined_global_sym_count || undefined_shobj_sym_count);
|
||
list_warning_symbols = warning_count;
|
||
list_multiple_defs = multiple_def_count != 0;
|
||
|
||
if (!(list_unresolved_refs ||
|
||
list_warning_symbols || list_multiple_defs))
|
||
/* No need to run this routine */
|
||
return 1;
|
||
|
||
if (entry_symbol && !entry_symbol->defined)
|
||
fprintf (outfile, "Undefined entry symbol %s\n",
|
||
entry_symbol->name);
|
||
each_file (do_file_warnings, outfile);
|
||
|
||
if (list_unresolved_refs || list_multiple_defs)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|