binutils-gdb/gdb/complaints.c

/* Support for complaint handling during symbol reading in GDB.

   Copyright (C) 1990, 1991, 1992, 1993, 1995, 1998, 1999, 2000, 2002, 2004,
   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "complaints.h"
#include "gdb_assert.h"
#include "command.h"
#include "gdbcmd.h"

extern void _initialize_complaints (void);

/* Should each complaint message be self explanatory, or should we assume that
   a series of complaints is being produced?  */

/* case 1: First message of a series that must
   start off with explanation.  case 2: Subsequent message of a series
   that needs no explanation (the user already knows we have a problem
   so we can just state our piece).  */
enum complaint_series {
  /* Isolated self explanatory message.  */
  ISOLATED_MESSAGE,
  /* First message of a series, includes an explanation.  */
  FIRST_MESSAGE,
  /* First message of a series, but does not need to include any sort
     of explanation.  */
  SHORT_FIRST_MESSAGE,
  /* Subsequent message of a series that needs no explanation (the
     user already knows we have a problem so we can just state our
     piece).  */
  SUBSEQUENT_MESSAGE
};

/* Structure to manage complaints about symbol file contents.  */

struct complain
{
  const char *file;
  int line;
  const char *fmt;
  int counter;
  struct complain *next;
};

/* The explanatory message that should accompany the complaint.  The
   message is in two parts - pre and post - that are printed around
   the complaint text.  */
struct explanation
{
  const char *prefix;
  const char *postfix;
};

struct complaints
{
  struct complain *root;

  /* Should each complaint be self explanatory, or should we assume
     that a series of complaints is being produced?  case 0: Isolated
     self explanatory message.  case 1: First message of a series that
     must start off with explanation.  case 2: Subsequent message of a
     series that needs no explanation (the user already knows we have
     a problem so we can just state our piece).  */
  int series;

  /* The explanatory messages that should accompany the complaint.
     NOTE: cagney/2002-08-14: In a desperate attempt at being vaguely
     i18n friendly, this is an array of two messages.  When present,
     the PRE and POST EXPLANATION[SERIES] are used to wrap the
     message.  */
  const struct explanation *explanation;
};

static struct complain complaint_sentinel;

/* The symbol table complaint table.  */

static struct explanation symfile_explanations[] = {
  { "During symbol reading, ", "." },
  { "During symbol reading...", "..."},
  { "", "..."},
  { "", "..."},
  { NULL, NULL }
};

static struct complaints symfile_complaint_book = {
  &complaint_sentinel,
  0,
  symfile_explanations
};
struct complaints *symfile_complaints = &symfile_complaint_book;

/* Wrapper function to, on-demand, fill in a complaints object.  */

static struct complaints *
get_complaints (struct complaints **c)
{
  if ((*c) != NULL)
    return (*c);
  (*c) = XMALLOC (struct complaints);
  (*c)->root = &complaint_sentinel;
  (*c)->series = ISOLATED_MESSAGE;
  (*c)->explanation = NULL;
  return (*c);
}

static struct complain * ATTRIBUTE_PRINTF (4, 0)
find_complaint (struct complaints *complaints, const char *file,
		int line, const char *fmt)
{
  struct complain *complaint;

  /* Find the complaint in the table.  A more efficient search
     algorithm (based on hash table or something) could be used.  But
     that can wait until someone shows evidence that this lookup is
     a real bottle neck.  */
  for (complaint = complaints->root;
       complaint != NULL;
       complaint = complaint->next)
    {
      if (complaint->fmt == fmt
	  && complaint->file == file
	  && complaint->line == line)
	return complaint;
    }

  /* Oops not seen before, fill in a new complaint.  */
  complaint = XMALLOC (struct complain);
  complaint->fmt = fmt;
  complaint->file = file;
  complaint->line = line;
  complaint->counter = 0;
  complaint->next = NULL;

  /* File it, return it.  */
  complaint->next = complaints->root;
  complaints->root = complaint;
  return complaint;
}


/* How many complaints about a particular thing should be printed
   before we stop whining about it?  Default is no whining at all,
   since so many systems have ill-constructed symbol files.  */

static int stop_whining = 0;

/* Print a complaint, and link the complaint block into a chain for
   later handling.  */

static void ATTRIBUTE_PRINTF (4, 0)
vcomplaint (struct complaints **c, const char *file, int line, const char *fmt,
	    va_list args)
{
  struct complaints *complaints = get_complaints (c);
  struct complain *complaint = find_complaint (complaints, file, line, fmt);
  enum complaint_series series;

  gdb_assert (complaints != NULL);

  complaint->counter++;
  if (complaint->counter > stop_whining)
    return;

  if (info_verbose)
    series = SUBSEQUENT_MESSAGE;
  else
    series = complaints->series;

  if (complaint->file != NULL)
    internal_vwarning (complaint->file, complaint->line, complaint->fmt, args);
  else if (deprecated_warning_hook)
    (*deprecated_warning_hook) (complaint->fmt, args);
  else
    {
      if (complaints->explanation == NULL)
	/* A [v]warning() call always appends a newline.  */
	vwarning (complaint->fmt, args);
      else
	{
	  char *msg;
	  struct cleanup *cleanups;
	  msg = xstrvprintf (complaint->fmt, args);
	  cleanups = make_cleanup (xfree, msg);
	  wrap_here ("");
	  if (series != SUBSEQUENT_MESSAGE)
	    begin_line ();
	  /* XXX: i18n */
	  fprintf_filtered (gdb_stderr, "%s%s%s",
			    complaints->explanation[series].prefix, msg,
			    complaints->explanation[series].postfix);
	  /* Force a line-break after any isolated message.  For the
             other cases, clear_complaints() takes care of any missing
             trailing newline, the wrap_here() is just a hint.  */
	  if (series == ISOLATED_MESSAGE)
	    /* It would be really nice to use begin_line() here.
	       Unfortunately that function doesn't track GDB_STDERR and
	       consequently will sometimes supress a line when it
	       shouldn't.  */
	    fputs_filtered ("\n", gdb_stderr);
	  else
	    wrap_here ("");
	  do_cleanups (cleanups);
	}
    }

  switch (series)
    {
    case ISOLATED_MESSAGE:
      break;
    case FIRST_MESSAGE:
      complaints->series = SUBSEQUENT_MESSAGE;
      break;
    case SUBSEQUENT_MESSAGE:
    case SHORT_FIRST_MESSAGE:
      complaints->series = SUBSEQUENT_MESSAGE;
      break;
    }

  /* If GDB dumps core, we'd like to see the complaints first.
     Presumably GDB will not be sending so many complaints that this
     becomes a performance hog.  */

  gdb_flush (gdb_stderr);
}

void
complaint (struct complaints **complaints, const char *fmt, ...)
{
  va_list args;

  va_start (args, fmt);
  vcomplaint (complaints, NULL/*file*/, 0/*line*/, fmt, args);
  va_end (args);
}

void
internal_complaint (struct complaints **complaints, const char *file,
		    int line, const char *fmt, ...)
{
  va_list args;
  va_start (args, fmt);
  vcomplaint (complaints, file, line, fmt, args);
  va_end (args);
}

/* Clear out / initialize all complaint counters that have ever been
   incremented.  If LESS_VERBOSE is 1, be less verbose about
   successive complaints, since the messages are appearing all
   together during a command that is reporting a contiguous block of
   complaints (rather than being interleaved with other messages).  If
   noisy is 1, we are in a noisy command, and our caller will print
   enough context for the user to figure it out.  */

void
clear_complaints (struct complaints **c, int less_verbose, int noisy)
{
  struct complaints *complaints = get_complaints (c);
  struct complain *p;

  for (p = complaints->root; p != NULL; p = p->next)
    {
      p->counter = 0;
    }

  switch (complaints->series)
    {
    case FIRST_MESSAGE:
      /* Haven't yet printed anything.  */
      break;
    case SHORT_FIRST_MESSAGE:
      /* Haven't yet printed anything.  */
      break;
    case ISOLATED_MESSAGE:
      /* The code above, always forces a line-break.  No need to do it
         here.  */
      break;
    case SUBSEQUENT_MESSAGE:
      /* It would be really nice to use begin_line() here.
         Unfortunately that function doesn't track GDB_STDERR and
         consequently will sometimes supress a line when it shouldn't.  */
      fputs_unfiltered ("\n", gdb_stderr);
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }

  if (!less_verbose)
    complaints->series = ISOLATED_MESSAGE;
  else if (!noisy)
    complaints->series = FIRST_MESSAGE;
  else
    complaints->series = SHORT_FIRST_MESSAGE;
}

static void
complaints_show_value (struct ui_file *file, int from_tty,
		       struct cmd_list_element *cmd, const char *value)
{
  fprintf_filtered (file, _("Max number of complaints about incorrect"
			    " symbols is %s.\n"),
		    value);
}

void
_initialize_complaints (void)
{
  add_setshow_zinteger_cmd ("complaints", class_support, &stop_whining, _("\
Set max number of complaints about incorrect symbols."), _("\
Show max number of complaints about incorrect symbols."), NULL,
			    NULL, complaints_show_value,
			    &setlist, &showlist);
}