xref: /openbsd-src/gnu/usr.bin/binutils/ld/ldmisc.c (revision 49975d4860c10c33c98009c5f02254dbca6129fd)

/* ldmisc.c
   Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   2000, 2002, 2003
   Free Software Foundation, Inc.
   Written by Steve Chamberlain of Cygnus Support.

   This file is part of GLD, the Gnu Linker.

   GLD is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GLD is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GLD; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

#include "bfd.h"
#include "bfdlink.h"
#include "sysdep.h"
#include "libiberty.h"
#include "demangle.h"
#include <stdarg.h>
#include "ld.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include <ldgram.h>
#include "ldlex.h"
#include "ldmain.h"
#include "ldfile.h"

/*
 %% literal %
 %F error is fatal
 %P print program name
 %S print script file and linenumber
 %E current bfd error or errno
 %I filename from a lang_input_statement_type
 %B filename from a bfd
 %T symbol name
 %X no object output, fail return
 %V hex bfd_vma
 %v hex bfd_vma, no leading zeros
 %W hex bfd_vma with 0x with no leading zeros taking up 8 spaces
 %C clever filename:linenumber with function
 %D like %C, but no function name
 %G like %D, but only function name
 %R info about a relent
 %s arbitrary string, like printf
 %d integer, like printf
 %u integer, like printf
*/

static void
vfinfo (FILE *fp, const char *fmt, va_list arg)
{
  bfd_boolean fatal = FALSE;

  while (*fmt != '\0')
    {
      while (*fmt != '%' && *fmt != '\0')
	{
	  putc (*fmt, fp);
	  fmt++;
	}

      if (*fmt == '%')
	{
	  fmt++;
	  switch (*fmt++)
	    {
	    default:
	      fprintf (fp, "%%%c", fmt[-1]);
	      break;

	    case '%':
	      /* literal % */
	      putc ('%', fp);
	      break;

	    case 'X':
	      /* no object output, fail return */
	      config.make_executable = FALSE;
	      break;

	    case 'V':
	      /* hex bfd_vma */
	      {
		bfd_vma value = va_arg (arg, bfd_vma);
		fprintf_vma (fp, value);
	      }
	      break;

	    case 'v':
	      /* hex bfd_vma, no leading zeros */
	      {
		char buf[100];
		char *p = buf;
		bfd_vma value = va_arg (arg, bfd_vma);
		sprintf_vma (p, value);
		while (*p == '0')
		  p++;
		if (!*p)
		  p--;
		fputs (p, fp);
	      }
	      break;

	    case 'W':
	      /* hex bfd_vma with 0x with no leading zeroes taking up
		 8 spaces.  */
	      {
		char buf[100];
		bfd_vma value;
		char *p;
		int len;

		value = va_arg (arg, bfd_vma);
		sprintf_vma (buf, value);
		for (p = buf; *p == '0'; ++p)
		  ;
		if (*p == '\0')
		  --p;
		len = strlen (p);
		while (len < 8)
		  {
		    putc (' ', fp);
		    ++len;
		  }
		fprintf (fp, "0x%s", p);
	      }
	      break;

	    case 'T':
	      /* Symbol name.  */
	      {
		const char *name = va_arg (arg, const char *);

		if (name == NULL || *name == 0)
		  fprintf (fp, _("no symbol"));
		else if (! demangling)
		  fprintf (fp, "%s", name);
		else
		  {
		    char *demangled;

		    demangled = demangle (name);
		    fprintf (fp, "%s", demangled);
		    free (demangled);
		  }
	      }
	      break;

	    case 'B':
	      /* filename from a bfd */
	      {
		bfd *abfd = va_arg (arg, bfd *);
		if (abfd->my_archive)
		  fprintf (fp, "%s(%s)", abfd->my_archive->filename,
			   abfd->filename);
		else
		  fprintf (fp, "%s", abfd->filename);
	      }
	      break;

	    case 'F':
	      /* Error is fatal.  */
	      fatal = TRUE;
	      break;

	    case 'P':
	      /* Print program name.  */
	      fprintf (fp, "%s", program_name);
	      break;

	    case 'E':
	      /* current bfd error or errno */
	      fprintf (fp, "%s", bfd_errmsg (bfd_get_error ()));
	      break;

	    case 'I':
	      /* filename from a lang_input_statement_type */
	      {
		lang_input_statement_type *i;

		i = va_arg (arg, lang_input_statement_type *);
		if (bfd_my_archive (i->the_bfd) != NULL)
		  fprintf (fp, "(%s)",
			   bfd_get_filename (bfd_my_archive (i->the_bfd)));
		fprintf (fp, "%s", i->local_sym_name);
		if (bfd_my_archive (i->the_bfd) == NULL
		    && strcmp (i->local_sym_name, i->filename) != 0)
		  fprintf (fp, " (%s)", i->filename);
	      }
	      break;

	    case 'S':
	      /* Print script file and linenumber.  */
	      if (parsing_defsym)
		fprintf (fp, "--defsym %s", lex_string);
	      else if (ldfile_input_filename != NULL)
		fprintf (fp, "%s:%u", ldfile_input_filename, lineno);
	      else
		fprintf (fp, _("built in linker script:%u"), lineno);
	      break;

	    case 'R':
	      /* Print all that's interesting about a relent.  */
	      {
		arelent *relent = va_arg (arg, arelent *);

		lfinfo (fp, "%s+0x%v (type %s)",
			(*(relent->sym_ptr_ptr))->name,
			relent->addend,
			relent->howto->name);
	      }
	      break;

	    case 'C':
	    case 'D':
	    case 'G':
	      /* Clever filename:linenumber with function name if possible.
		 The arguments are a BFD, a section, and an offset.  */
	      {
		static bfd *last_bfd;
		static char *last_file = NULL;
		static char *last_function = NULL;
		bfd *abfd;
		asection *section;
		bfd_vma offset;
		lang_input_statement_type *entry;
		asymbol **asymbols;
		const char *filename;
		const char *functionname;
		unsigned int linenumber;
		bfd_boolean discard_last;

		abfd = va_arg (arg, bfd *);
		section = va_arg (arg, asection *);
		offset = va_arg (arg, bfd_vma);

		entry = (lang_input_statement_type *) abfd->usrdata;
		if (entry != (lang_input_statement_type *) NULL
		    && entry->asymbols != (asymbol **) NULL)
		  asymbols = entry->asymbols;
		else
		  {
		    long symsize;
		    long symbol_count;

		    symsize = bfd_get_symtab_upper_bound (abfd);
		    if (symsize < 0)
		      einfo (_("%B%F: could not read symbols\n"), abfd);
		    asymbols = xmalloc (symsize);
		    symbol_count = bfd_canonicalize_symtab (abfd, asymbols);
		    if (symbol_count < 0)
		      einfo (_("%B%F: could not read symbols\n"), abfd);
		    if (entry != (lang_input_statement_type *) NULL)
		      {
			entry->asymbols = asymbols;
			entry->symbol_count = symbol_count;
		      }
		  }

		lfinfo (fp, "%B(%s+0x%v)", abfd, section->name, offset);

		discard_last = TRUE;
		if (bfd_find_nearest_line (abfd, section, asymbols, offset,
					   &filename, &functionname,
					   &linenumber))
		  {
		    bfd_boolean need_colon = TRUE;

		    if (functionname != NULL && fmt[-1] == 'C')
		      {
			if (last_bfd == NULL
			    || last_file == NULL
			    || last_function == NULL
			    || last_bfd != abfd
			    || (filename != NULL
				&& strcmp (last_file, filename) != 0)
			    || strcmp (last_function, functionname) != 0)
			  {
			    lfinfo (fp, _(": In function `%T':\n"),
				    functionname);
			    need_colon = FALSE;

			    last_bfd = abfd;
			    if (last_file != NULL)
			      free (last_file);
			    last_file = NULL;
			    if (filename)
			      last_file = xstrdup (filename);
			    if (last_function != NULL)
			      free (last_function);
			    last_function = xstrdup (functionname);
			  }
			discard_last = FALSE;
		      }

		    if (filename != NULL)
		      {
			if (need_colon)
			  putc (':', fp);
			fputs (filename, fp);
		      }

		    if (functionname != NULL && fmt[-1] == 'G')
		      lfinfo (fp, ":%T", functionname);
		    else if (filename != NULL && linenumber != 0)
		      fprintf (fp, ":%u", linenumber);
		  }

		if (asymbols != NULL && entry == NULL)
		  free (asymbols);

		if (discard_last)
		  {
		    last_bfd = NULL;
		    if (last_file != NULL)
		      {
			free (last_file);
			last_file = NULL;
		      }
		    if (last_function != NULL)
		      {
			free (last_function);
			last_function = NULL;
		      }
		  }
	      }
	      break;

	    case 's':
	      /* arbitrary string, like printf */
	      fprintf (fp, "%s", va_arg (arg, char *));
	      break;

	    case 'd':
	      /* integer, like printf */
	      fprintf (fp, "%d", va_arg (arg, int));
	      break;

	    case 'u':
	      /* unsigned integer, like printf */
	      fprintf (fp, "%u", va_arg (arg, unsigned int));
	      break;
	    }
	}
    }

  if (config.fatal_warnings)
    config.make_executable = FALSE;

  if (fatal)
    xexit (1);
}

/* Wrapper around cplus_demangle.  Strips leading underscores and
   other such chars that would otherwise confuse the demangler.  */

char *
demangle (const char *name)
{
  char *res;
  const char *p;

  if (output_bfd != NULL
      && bfd_get_symbol_leading_char (output_bfd) == name[0])
    ++name;

  /* This is a hack for better error reporting on XCOFF, PowerPC64-ELF
     or the MS PE format.  These formats have a number of leading '.'s
     on at least some symbols, so we remove all dots to avoid
     confusing the demangler.  */
  p = name;
  while (*p == '.')
    ++p;

  res = cplus_demangle (p, DMGL_ANSI | DMGL_PARAMS);
  if (res)
    {
      size_t dots = p - name;

      /* Now put back any stripped dots.  */
      if (dots != 0)
	{
	  size_t len = strlen (res) + 1;
	  char *add_dots = xmalloc (len + dots);

	  memcpy (add_dots, name, dots);
	  memcpy (add_dots + dots, res, len);
	  free (res);
	  res = add_dots;
	}
      return res;
    }
  return xstrdup (name);
}

/* Format info message and print on stdout.  */

/* (You would think this should be called just "info", but then you
   would be hosed by LynxOS, which defines that name in its libc.)  */

void
info_msg (const char *fmt, ...)
{
  va_list arg;

  va_start (arg, fmt);
  vfinfo (stdout, fmt, arg);
  va_end (arg);
}

/* ('e' for error.) Format info message and print on stderr.  */

void
einfo (const char *fmt, ...)
{
  va_list arg;
  char buf[BUFSIZ];

  setvbuf(stderr, buf, _IOFBF, sizeof(buf));
  va_start (arg, fmt);
  vfinfo (stderr, fmt, arg);
  va_end (arg);
  fflush(stderr);
  setvbuf(stderr, NULL, _IONBF, 0);
}

void
info_assert (const char *file, unsigned int line)
{
  einfo (_("%F%P: internal error %s %d\n"), file, line);
}

/* ('m' for map) Format info message and print on map.  */

void
minfo (const char *fmt, ...)
{
  va_list arg;

  va_start (arg, fmt);
  vfinfo (config.map_file, fmt, arg);
  va_end (arg);
}

void
lfinfo (FILE *file, const char *fmt, ...)
{
  va_list arg;

  va_start (arg, fmt);
  vfinfo (file, fmt, arg);
  va_end (arg);
}

/* Functions to print the link map.  */

void
print_space (void)
{
  fprintf (config.map_file, " ");
}

void
print_nl (void)
{
  fprintf (config.map_file, "\n");
}

/* A more or less friendly abort message.  In ld.h abort is defined to
   call this function.  */

void
ld_abort (const char *file, int line, const char *fn)
{
  if (fn != NULL)
    einfo (_("%P: internal error: aborting at %s line %d in %s\n"),
	   file, line, fn);
  else
    einfo (_("%P: internal error: aborting at %s line %d\n"),
	   file, line);
  einfo (_("%P%F: please report this bug\n"));
  xexit (1);
}

bfd_boolean
error_handler (int id, const char *fmt, ...)
{
  va_list arg;

  va_start (arg, fmt);

  switch (id)
    {
    default:
      break;

    /* We can be called with

	error_handler (-LD_DEFINITION_IN_DISCARDED_SECTION, "", 0);

	to make this error non-fatal and

	error_handler (-LD_DEFINITION_IN_DISCARDED_SECTION, "", 1);

	to make this error fatal.  */
    case -LD_DEFINITION_IN_DISCARDED_SECTION:
    case LD_DEFINITION_IN_DISCARDED_SECTION:
      {
	static struct bfd_hash_table *hash;
	static int fatal = 1;
	const char *name;

	if (id == -LD_DEFINITION_IN_DISCARDED_SECTION)
	  {
	    fatal = va_arg (arg, int);
	    goto out;
	  }

	name = va_arg (arg, const char *);
	/* Only warn once about a particular undefined symbol.  */
	if (hash == NULL)
	  {
	    hash = xmalloc (sizeof (struct bfd_hash_table));
	    if (! bfd_hash_table_init (hash, bfd_hash_newfunc))
	      einfo (_("%F%P: bfd_hash_table_init failed: %E\n"));
	  }

	if (bfd_hash_lookup (hash, name, FALSE, FALSE) != NULL)
	  goto out;

	if (bfd_hash_lookup (hash, name, TRUE, TRUE) == NULL)
	  einfo (_("%F%P: bfd_hash_lookup failed: %E\n"));

	if (fatal)
	  config.make_executable = FALSE;
      }
      break;
    }
  vfinfo (stderr, fmt, arg);

out:
  va_end (arg);
  return TRUE;
}