binutils-gdb/ld/ldmisc.c

/* ldmisc.c
   Copyright (C) 1991-2017 Free Software Foundation, Inc.
   Written by Steve Chamberlain of Cygnus Support.

   This file is part of the GNU Binutils.

   This program 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 3 of the License, or
   (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libiberty.h"
#include "filenames.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"
#include "elf-bfd.h"
#include "coff-bfd.h"

/*
 %% literal %
 %A section name from a section
 %B filename from a bfd
 %C clever filename:linenumber with function
 %D like %C, but no function name
 %E current bfd error or errno
 %F error is fatal
 %G like %D, but only function name
 %H like %C but in addition emit section+offset
 %I filename from a lang_input_statement_type
 %P print program name
 %R info about a relent
 %S print script file and linenumber from etree_type.
 %T symbol name
 %V hex bfd_vma
 %W hex bfd_vma with 0x with no leading zeros taking up 8 spaces
 %X no object output, fail return
 %d integer, like printf
 %ld long, like printf
 %lu unsigned long, like printf
 %p native (host) void* pointer, like printf
 %s arbitrary string, like printf
 %u integer, like printf
 %v hex bfd_vma, no leading zeros
*/

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

  while (*fmt != '\0')
    {
      const char *str = fmt;
      while (*fmt != '%' && *fmt != '\0')
	fmt++;
      if (fmt != str)
	if (fwrite (str, 1, fmt - str, fp))
	  {
	    /* Ignore.  */
	  }

      if (*fmt == '%')
	{
	  fmt++;
	  switch (*fmt++)
	    {
	    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"));
		    break;
		  }
		else if (demangling)
		  {
		    char *demangled;

		    demangled = bfd_demangle (link_info.output_bfd, name,
					      DMGL_ANSI | DMGL_PARAMS);
		    if (demangled != NULL)
		      {
			fprintf (fp, "%s", demangled);
			free (demangled);
			break;
		      }
		  }
		fprintf (fp, "%s", name);
	      }
	      break;

	    case 'A':
	      /* section name from a section */
	      {
		asection *sec = va_arg (arg, asection *);
		bfd *abfd = sec->owner;
		const char *group = NULL;
		struct coff_comdat_info *ci;

		fprintf (fp, "%s", sec->name);
		if (abfd != NULL
		    && bfd_get_flavour (abfd) == bfd_target_elf_flavour
		    && elf_next_in_group (sec) != NULL
		    && (sec->flags & SEC_GROUP) == 0)
		  group = elf_group_name (sec);
		else if (abfd != NULL
			 && bfd_get_flavour (abfd) == bfd_target_coff_flavour
			 && (ci = bfd_coff_get_comdat_section (sec->owner,
							       sec)) != NULL)
		  group = ci->name;
		if (group != NULL)
		  fprintf (fp, "[%s]", group);
	      }
	      break;

	    case 'B':
	      /* filename from a bfd */
	      {
		bfd *abfd = va_arg (arg, bfd *);

		if (abfd == NULL)
		  fprintf (fp, "%s generated", program_name);
		else if (abfd->my_archive != NULL
			 && !bfd_is_thin_archive (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 (i->the_bfd->my_archive != NULL
		    && !bfd_is_thin_archive (i->the_bfd->my_archive))
		  fprintf (fp, "(%s)",
			   bfd_get_filename (i->the_bfd->my_archive));
		fprintf (fp, "%s", i->local_sym_name);
		if ((i->the_bfd->my_archive == NULL
		     || bfd_is_thin_archive (i->the_bfd->my_archive))
		    && filename_cmp (i->local_sym_name, i->filename) != 0)
		  fprintf (fp, " (%s)", i->filename);
	      }
	      break;

	    case 'S':
	      /* Print script file and linenumber.  */
	      {
		etree_type node;
		etree_type *tp = va_arg (arg, etree_type *);

		if (tp == NULL)
		  {
		    tp = &node;
		    tp->type.filename = ldlex_filename ();
		    tp->type.lineno = lineno;
		  }
		if (tp->type.filename != NULL)
		  fprintf (fp, "%s:%u", tp->type.filename, tp->type.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':
	    case 'H':
	      /* 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;
		static char *last_function;
		bfd *abfd;
		asection *section;
		bfd_vma offset;
		asymbol **asymbols = NULL;
		const char *filename;
		const char *functionname;
		unsigned int linenumber;
		bfd_boolean discard_last;
		bfd_boolean done;

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

		if (abfd != NULL)
		  {
		    if (!bfd_generic_link_read_symbols (abfd))
		      einfo (_("%B%F: could not read symbols: %E\n"), abfd);

		    asymbols = bfd_get_outsymbols (abfd);
		  }

		/* The GNU Coding Standard requires that error messages
		   be of the form:

		     source-file-name:lineno: message

		   We do not always have a line number available so if
		   we cannot find them we print out the section name and
		   offset instead.  */
		discard_last = TRUE;
		if (abfd != NULL
		    && bfd_find_nearest_line (abfd, section, asymbols, offset,
					      &filename, &functionname,
					      &linenumber))
		  {
		    if (functionname != NULL
			&& (fmt[-1] == 'C' || fmt[-1] == 'H'))
		      {
			/* Detect the case where we are printing out a
			   message for the same function as the last
			   call to vinfo ("%C").  In this situation do
			   not print out the ABFD filename or the
			   function name again.  Note - we do still
			   print out the source filename, as this will
			   allow programs that parse the linker's output
			   (eg emacs) to correctly locate multiple
			   errors in the same source file.  */
			if (last_bfd == NULL
			    || last_function == NULL
			    || last_bfd != abfd
			    || (last_file == NULL) != (filename == NULL)
			    || (filename != NULL
				&& filename_cmp (last_file, filename) != 0)
			    || strcmp (last_function, functionname) != 0)
			  {
			    lfinfo (fp, _("%B: In function `%T':\n"),
				    abfd, functionname);

			    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;
		      }
		    else
		      lfinfo (fp, "%B:", abfd);

		    if (filename != NULL)
		      fprintf (fp, "%s:", filename);

		    done = fmt[-1] != 'H';
		    if (functionname != NULL && fmt[-1] == 'G')
		      lfinfo (fp, "%T", functionname);
		    else if (filename != NULL && linenumber != 0)
		      fprintf (fp, "%u%s", linenumber, done ? "" : ":");
		    else
		      done = FALSE;
		  }
		else
		  {
		    lfinfo (fp, "%B:", abfd);
		    done = FALSE;
		  }
		if (!done)
		  lfinfo (fp, "(%A+0x%v)", section, offset);

		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 'p':
	      /* native (host) void* pointer, like printf */
	      fprintf (fp, "%p", va_arg (arg, void *));
	      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;

	    case 'l':
	      if (*fmt == 'd')
		{
		  fprintf (fp, "%ld", va_arg (arg, long));
		  ++fmt;
		  break;
		}
	      else if (*fmt == 'u')
		{
		  fprintf (fp, "%lu", va_arg (arg, unsigned long));
		  ++fmt;
		  break;
		}
	      /* Fallthru */

	    default:
	      fprintf (fp, "%%%c", fmt[-1]);
	      break;
	    }
	}
    }

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

  if (fatal)
    xexit (1);
}

/* 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, FALSE);
  va_end (arg);
}

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

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

  fflush (stdout);
  va_start (arg, fmt);
  vfinfo (stderr, fmt, arg, TRUE);
  va_end (arg);
  fflush (stderr);
}

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, ...)
{
  if (config.map_file != NULL)
    {
      va_list arg;

      va_start (arg, fmt);
      if (fmt[0] == '%' && fmt[1] == '!' && fmt[2] == 0)
	{
	  /* Stash info about --as-needed shared libraries.  Print
	     later so they don't appear intermingled with archive
	     library info.  */
	  struct asneeded_minfo *m = xmalloc (sizeof *m);

	  m->next = NULL;
	  m->soname = va_arg (arg, const char *);
	  m->ref = va_arg (arg, bfd *);
	  m->name = va_arg (arg, const char *);
	  *asneeded_list_tail = m;
	  asneeded_list_tail = &m->next;
	}
      else
	vfinfo (config.map_file, fmt, arg, FALSE);
      va_end (arg);
    }
}

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

  va_start (arg, fmt);
  vfinfo (file, fmt, arg, FALSE);
  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:%d in %s\n"),
	   file, line, fn);
  else
    einfo (_("%P: internal error: aborting at %s:%d\n"),
	   file, line);
  einfo (_("%P%F: please report this bug\n"));
  xexit (1);
}