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/* Language-independent diagnostic subroutines for the GNU Compiler Collection

   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

   2009, 2010, 2011, 2012 Free Software Foundation, Inc.

   Contributed by Gabriel Dos Reis <gdr@codesourcery.com>

This file is part of GCC.

GCC 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, or (at your option) any later

version.

GCC 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 GCC; see the file COPYING3.  If not see

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

/* This file implements the language independent aspect of diagnostic

   message module.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "version.h"

#include "input.h"

#include "intl.h"

#include "diagnostic.h"

#define pedantic_warning_kind(DC)                       \

  ((DC)->pedantic_errors ? DK_ERROR : DK_WARNING)

#define permissive_error_kind(DC) ((DC)->permissive ? DK_WARNING : DK_ERROR)

#define permissive_error_option(DC) ((DC)->opt_permissive)

/* Prototypes.  */

static char *build_message_string (const char *, ...) ATTRIBUTE_PRINTF_1;

static void error_recursion (diagnostic_context *) ATTRIBUTE_NORETURN;

static void diagnostic_action_after_output (diagnostic_context *,

                                            diagnostic_info *);

static void real_abort (void) ATTRIBUTE_NORETURN;

/* Name of program invoked, sans directories.  */

const char *progname;

/* A diagnostic_context surrogate for stderr.  */

static diagnostic_context global_diagnostic_context;

diagnostic_context *global_dc = &global_diagnostic_context;

/* Return a malloc'd string containing MSG formatted a la printf.  The

   caller is responsible for freeing the memory.  */

static char *

build_message_string (const char *msg, ...)

{

  char *str;

  va_list ap;

  va_start (ap, msg);

  vasprintf (&str, msg, ap);

  va_end (ap);

  return str;

}

/* Same as diagnostic_build_prefix, but only the source FILE is given.  */

char *

file_name_as_prefix (const char *f)

{

  return build_message_string ("%s: ", f);

}

/* Initialize the diagnostic message outputting machinery.  */

void

diagnostic_initialize (diagnostic_context *context, int n_opts)

{

  int i;

  /* Allocate a basic pretty-printer.  Clients will replace this a

     much more elaborated pretty-printer if they wish.  */

  context->printer = XNEW (pretty_printer);

  pp_construct (context->printer, NULL, 0);

  /* By default, diagnostics are sent to stderr.  */

  context->printer->buffer->stream = stderr;

  /* By default, we emit prefixes once per message.  */

  context->printer->wrapping.rule = DIAGNOSTICS_SHOW_PREFIX_ONCE;

  memset (context->diagnostic_count, 0, sizeof context->diagnostic_count);

  context->some_warnings_are_errors = false;

  context->warning_as_error_requested = false;

  context->n_opts = n_opts;

  context->classify_diagnostic = XNEWVEC (diagnostic_t, n_opts);

  for (i = 0; i < n_opts; i++)

    context->classify_diagnostic[i] = DK_UNSPECIFIED;

  context->show_option_requested = false;

  context->abort_on_error = false;

  context->show_column = false;

  context->pedantic_errors = false;

  context->permissive = false;

  context->opt_permissive = 0;

  context->fatal_errors = false;

  context->dc_inhibit_warnings = false;

  context->dc_warn_system_headers = false;

  context->max_errors = 0;

  context->internal_error = NULL;

  diagnostic_starter (context) = default_diagnostic_starter;

  diagnostic_finalizer (context) = default_diagnostic_finalizer;

  context->option_enabled = NULL;

  context->option_state = NULL;

  context->option_name = NULL;

  context->last_module = 0;

  context->x_data = NULL;

  context->lock = 0;

  context->inhibit_notes_p = false;

}

/* Do any cleaning up required after the last diagnostic is emitted.  */

void

diagnostic_finish (diagnostic_context *context)

{

  /* Some of the errors may actually have been warnings.  */

  if (context->some_warnings_are_errors)

    {

      /* -Werror was given.  */

      if (context->warning_as_error_requested)

        pp_verbatim (context->printer,

                     _("%s: all warnings being treated as errors"),

                     progname);

      /* At least one -Werror= was given.  */

      else

        pp_verbatim (context->printer,

                     _("%s: some warnings being treated as errors"),

                     progname);

      pp_flush (context->printer);

    }

}

/* Initialize DIAGNOSTIC, where the message MSG has already been

   translated.  */

void

diagnostic_set_info_translated (diagnostic_info *diagnostic, const char *msg,

                                va_list *args, location_t location,

                                diagnostic_t kind)

{

  diagnostic->message.err_no = errno;

  diagnostic->message.args_ptr = args;

  diagnostic->message.format_spec = msg;

  diagnostic->location = location;

  diagnostic->override_column = 0;

  diagnostic->kind = kind;

  diagnostic->option_index = 0;

}

/* Initialize DIAGNOSTIC, where the message GMSGID has not yet been

   translated.  */

void

diagnostic_set_info (diagnostic_info *diagnostic, const char *gmsgid,

                     va_list *args, location_t location,

                     diagnostic_t kind)

{

  diagnostic_set_info_translated (diagnostic, _(gmsgid), args, location, kind);

}

/* Return a malloc'd string describing a location.  The caller is

   responsible for freeing the memory.  */

char *

diagnostic_build_prefix (diagnostic_context *context,

                         diagnostic_info *diagnostic)

{

  static const char *const diagnostic_kind_text[] = {

#define DEFINE_DIAGNOSTIC_KIND(K, T) (T),

#include "diagnostic.def"

#undef DEFINE_DIAGNOSTIC_KIND

    "must-not-happen"

  };

  const char *text = _(diagnostic_kind_text[diagnostic->kind]);

  expanded_location s = expand_location (diagnostic->location);

  if (diagnostic->override_column)

    s.column = diagnostic->override_column;

  gcc_assert (diagnostic->kind < DK_LAST_DIAGNOSTIC_KIND);

  return

    (s.file == NULL

     ? build_message_string ("%s: %s", progname, text)

     : context->show_column

     ? build_message_string ("%s:%d:%d: %s", s.file, s.line, s.column, text)

     : build_message_string ("%s:%d: %s", s.file, s.line, text));

}

/* Take any action which is expected to happen after the diagnostic

   is written out.  This function does not always return.  */

static void

diagnostic_action_after_output (diagnostic_context *context,

                                diagnostic_info *diagnostic)

{

  switch (diagnostic->kind)

    {

    case DK_DEBUG:

    case DK_NOTE:

    case DK_ANACHRONISM:

    case DK_WARNING:

      break;

    case DK_ERROR:

    case DK_SORRY:

      if (context->abort_on_error)

        real_abort ();

      if (context->fatal_errors)

        {

          fnotice (stderr, "compilation terminated due to -Wfatal-errors.\n");

          diagnostic_finish (context);

          exit (FATAL_EXIT_CODE);

        }

      if (context->max_errors != 0

          && ((unsigned) (diagnostic_kind_count (context, DK_ERROR)

                          + diagnostic_kind_count (context, DK_SORRY))

              >= context->max_errors))

        {

          fnotice (stderr,

                   "compilation terminated due to -fmax-errors=%u.\n",

                   context->max_errors);

          diagnostic_finish (context);

          exit (FATAL_EXIT_CODE);

        }

      break;

    case DK_ICE:

      if (context->abort_on_error)

        real_abort ();

      fnotice (stderr, "Please submit a full bug report,\n"

               "with preprocessed source if appropriate.\n"

               "See %s for instructions.\n", bug_report_url);

      exit (ICE_EXIT_CODE);

    case DK_FATAL:

      if (context->abort_on_error)

        real_abort ();

      diagnostic_finish (context);

      fnotice (stderr, "compilation terminated.\n");

      exit (FATAL_EXIT_CODE);

    default:

      gcc_unreachable ();

    }

}

void

diagnostic_report_current_module (diagnostic_context *context, location_t where)

{

  const struct line_map *map = NULL;

  if (pp_needs_newline (context->printer))

    {

      pp_newline (context->printer);

      pp_needs_newline (context->printer) = false;

    }

  if (where <= BUILTINS_LOCATION)

    return;

  linemap_resolve_location (line_table, where,

                            LRK_MACRO_DEFINITION_LOCATION,

                            &map);

  if (map && diagnostic_last_module_changed (context, map))

    {

      diagnostic_set_last_module (context, map);

      if (! MAIN_FILE_P (map))

        {

          map = INCLUDED_FROM (line_table, map);

          if (context->show_column)

            pp_verbatim (context->printer,

                         "In file included from %s:%d:%d",

                         LINEMAP_FILE (map),

                         LAST_SOURCE_LINE (map), LAST_SOURCE_COLUMN (map));

          else

            pp_verbatim (context->printer,

                         "In file included from %s:%d",

                         LINEMAP_FILE (map), LAST_SOURCE_LINE (map));

          while (! MAIN_FILE_P (map))

            {

              map = INCLUDED_FROM (line_table, map);

              pp_verbatim (context->printer,

                           ",\n                 from %s:%d",

                           LINEMAP_FILE (map), LAST_SOURCE_LINE (map));

            }

          pp_verbatim (context->printer, ":");

          pp_newline (context->printer);

        }

    }

}

void

default_diagnostic_starter (diagnostic_context *context,

                            diagnostic_info *diagnostic)

{

  diagnostic_report_current_module (context, diagnostic->location);

  pp_set_prefix (context->printer, diagnostic_build_prefix (context,

                                                            diagnostic));

}

void

default_diagnostic_finalizer (diagnostic_context *context,

                              diagnostic_info *diagnostic ATTRIBUTE_UNUSED)

{

  pp_destroy_prefix (context->printer);

}

/* Interface to specify diagnostic kind overrides.  Returns the

   previous setting, or DK_UNSPECIFIED if the parameters are out of

   range.  */

diagnostic_t

diagnostic_classify_diagnostic (diagnostic_context *context,

                                int option_index,

                                diagnostic_t new_kind,

                                location_t where)

{

  diagnostic_t old_kind;

  if (option_index <= 0

      || option_index >= context->n_opts

      || new_kind >= DK_LAST_DIAGNOSTIC_KIND)

    return DK_UNSPECIFIED;

  old_kind = context->classify_diagnostic[option_index];

  /* Handle pragmas separately, since we need to keep track of *where*

     the pragmas were.  */

  if (where != UNKNOWN_LOCATION)

    {

      int i;

      for (i = context->n_classification_history - 1; i >= 0; i --)

        if (context->classification_history[i].option == option_index)

          {

            old_kind = context->classification_history[i].kind;

            break;

          }

      i = context->n_classification_history;

      context->classification_history =

        (diagnostic_classification_change_t *) xrealloc (context->classification_history, (i + 1)

                                                         * sizeof (diagnostic_classification_change_t));

      context->classification_history[i].location = where;

      context->classification_history[i].option = option_index;

      context->classification_history[i].kind = new_kind;

      context->n_classification_history ++;

    }

  else

    context->classify_diagnostic[option_index] = new_kind;

  return old_kind;

}

/* Save all diagnostic classifications in a stack.  */

void

diagnostic_push_diagnostics (diagnostic_context *context, location_t where ATTRIBUTE_UNUSED)

{

  context->push_list = (int *) xrealloc (context->push_list, (context->n_push + 1) * sizeof (int));

  context->push_list[context->n_push ++] = context->n_classification_history;

}

/* Restore the topmost classification set off the stack.  If the stack

   is empty, revert to the state based on command line parameters.  */

void

diagnostic_pop_diagnostics (diagnostic_context *context, location_t where)

{

  int jump_to;

  int i;

  if (context->n_push)

    jump_to = context->push_list [-- context->n_push];

  else

    jump_to = 0;

  i = context->n_classification_history;

  context->classification_history =

    (diagnostic_classification_change_t *) xrealloc (context->classification_history, (i + 1)

                                                     * sizeof (diagnostic_classification_change_t));

  context->classification_history[i].location = where;

  context->classification_history[i].option = jump_to;

  context->classification_history[i].kind = DK_POP;

  context->n_classification_history ++;

}

/* Report a diagnostic message (an error or a warning) as specified by

   DC.  This function is *the* subroutine in terms of which front-ends

   should implement their specific diagnostic handling modules.  The

   front-end independent format specifiers are exactly those described

   in the documentation of output_format.

   Return true if a diagnostic was printed, false otherwise.  */

bool

diagnostic_report_diagnostic (diagnostic_context *context,

                              diagnostic_info *diagnostic)

{

  location_t location = diagnostic->location;

  diagnostic_t orig_diag_kind = diagnostic->kind;

  const char *saved_format_spec;

  /* Give preference to being able to inhibit warnings, before they

     get reclassified to something else.  */

  if ((diagnostic->kind == DK_WARNING || diagnostic->kind == DK_PEDWARN)

      && !diagnostic_report_warnings_p (context, location))

    return false;

  if (diagnostic->kind == DK_PEDWARN)

    {

      diagnostic->kind = pedantic_warning_kind (context);

      /* We do this to avoid giving the message for -pedantic-errors.  */

      orig_diag_kind = diagnostic->kind;

    }

  if (diagnostic->kind == DK_NOTE && context->inhibit_notes_p)

    return false;

  if (context->lock > 0)

    {

      /* If we're reporting an ICE in the middle of some other error,

         try to flush out the previous error, then let this one

         through.  Don't do this more than once.  */

      if (diagnostic->kind == DK_ICE && context->lock == 1)

        pp_flush (context->printer);

      else

        error_recursion (context);

    }

  /* If the user requested that warnings be treated as errors, so be

     it.  Note that we do this before the next block so that

     individual warnings can be overridden back to warnings with

     -Wno-error=*.  */

  if (context->warning_as_error_requested

      && diagnostic->kind == DK_WARNING)

    {

      diagnostic->kind = DK_ERROR;

    }

  if (diagnostic->option_index)

    {

      diagnostic_t diag_class = DK_UNSPECIFIED;

      /* This tests if the user provided the appropriate -Wfoo or

         -Wno-foo option.  */

      if (! context->option_enabled (diagnostic->option_index,

                                     context->option_state))

        return false;

      /* This tests for #pragma diagnostic changes.  */

      if (context->n_classification_history > 0)

        {

          int i;

          /* FIXME: Stupid search.  Optimize later. */

          for (i = context->n_classification_history - 1; i >= 0; i --)

            {

              if (linemap_location_before_p

                  (line_table,

                   context->classification_history[i].location,

                   location))

                {

                  if (context->classification_history[i].kind == (int) DK_POP)

                    {

                      i = context->classification_history[i].option;

                      continue;

                    }

                  if (context->classification_history[i].option == diagnostic->option_index)

                    {

                      diag_class = context->classification_history[i].kind;

                      if (diag_class != DK_UNSPECIFIED)

                        diagnostic->kind = diag_class;

                      break;

                    }

                }

            }

        }

      /* This tests if the user provided the appropriate -Werror=foo

         option.  */

      if (diag_class == DK_UNSPECIFIED

          && context->classify_diagnostic[diagnostic->option_index] != DK_UNSPECIFIED)

        {

          diagnostic->kind = context->classify_diagnostic[diagnostic->option_index];

        }

      /* This allows for future extensions, like temporarily disabling

         warnings for ranges of source code.  */

      if (diagnostic->kind == DK_IGNORED)

        return false;

    }

  if (orig_diag_kind == DK_WARNING && diagnostic->kind == DK_ERROR)

    context->some_warnings_are_errors = true;

  context->lock++;

  if (diagnostic->kind == DK_ICE)

    {

#ifndef ENABLE_CHECKING

      /* When not checking, ICEs are converted to fatal errors when an

         error has already occurred.  This is counteracted by

         abort_on_error.  */

      if ((diagnostic_kind_count (context, DK_ERROR) > 0

           || diagnostic_kind_count (context, DK_SORRY) > 0)

          && !context->abort_on_error)

        {

          expanded_location s = expand_location (diagnostic->location);

          fnotice (stderr, "%s:%d: confused by earlier errors, bailing out\n",

                   s.file, s.line);

          exit (ICE_EXIT_CODE);

        }

#endif

      if (context->internal_error)

        (*context->internal_error) (context,

                                    diagnostic->message.format_spec,

                                    diagnostic->message.args_ptr);

    }

  ++diagnostic_kind_count (context, diagnostic->kind);

  saved_format_spec = diagnostic->message.format_spec;

  if (context->show_option_requested)

    {

      char *option_text;

      option_text = context->option_name (context, diagnostic->option_index,

                                          orig_diag_kind, diagnostic->kind);

      if (option_text)

        {

          diagnostic->message.format_spec

            = ACONCAT ((diagnostic->message.format_spec,

                        " ",

                        "[", option_text, "]",

                        NULL));

          free (option_text);

        }

    }

  diagnostic->message.locus = &diagnostic->location;

  diagnostic->message.x_data = &diagnostic->x_data;

  diagnostic->x_data = NULL;

  pp_format (context->printer, &diagnostic->message);

  (*diagnostic_starter (context)) (context, diagnostic);

  pp_output_formatted_text (context->printer);

  (*diagnostic_finalizer (context)) (context, diagnostic);

  pp_flush (context->printer);

  diagnostic_action_after_output (context, diagnostic);

  diagnostic->message.format_spec = saved_format_spec;

  diagnostic->x_data = NULL;

  context->lock--;

  return true;

}

/* Given a partial pathname as input, return another pathname that

   shares no directory elements with the pathname of __FILE__.  This

   is used by fancy_abort() to print `Internal compiler error in expr.c'

   instead of `Internal compiler error in ../../GCC/gcc/expr.c'.  */

const char *

trim_filename (const char *name)

{

  static const char this_file[] = __FILE__;

  const char *p = name, *q = this_file;

  /* First skip any "../" in each filename.  This allows us to give a proper

     reference to a file in a subdirectory.  */

  while (p[0] == '.' && p[1] == '.' && IS_DIR_SEPARATOR (p[2]))

    p += 3;

  while (q[0] == '.' && q[1] == '.' && IS_DIR_SEPARATOR (q[2]))

    q += 3;

  /* Now skip any parts the two filenames have in common.  */

  while (*p == *q && *p != 0 && *q != 0)

    p++, q++;

  /* Now go backwards until the previous directory separator.  */

  while (p > name && !IS_DIR_SEPARATOR (p[-1]))

    p--;

  return p;

}

/* Standard error reporting routines in increasing order of severity.

   All of these take arguments like printf.  */

/* Text to be emitted verbatim to the error message stream; this

   produces no prefix and disables line-wrapping.  Use rarely.  */

void

verbatim (const char *gmsgid, ...)

{

  text_info text;

  va_list ap;

  va_start (ap, gmsgid);

  text.err_no = errno;

  text.args_ptr = ≈

  text.format_spec = _(gmsgid);

  text.locus = NULL;

  text.x_data = NULL;

  pp_format_verbatim (global_dc->printer, &text);

  pp_flush (global_dc->printer);

  va_end (ap);

}

bool

emit_diagnostic (diagnostic_t kind, location_t location, int opt,

                 const char *gmsgid, ...)

{

  diagnostic_info diagnostic;

  va_list ap;

  va_start (ap, gmsgid);

  if (kind == DK_PERMERROR)

    {

      diagnostic_set_info (&diagnostic, gmsgid, &ap, location,

                           permissive_error_kind (global_dc));

      diagnostic.option_index = permissive_error_option (global_dc);

    }

  else {

      diagnostic_set_info (&diagnostic, gmsgid, &ap, location, kind);

      if (kind == DK_WARNING || kind == DK_PEDWARN)

        diagnostic.option_index = opt;

  }

  va_end (ap);

  return report_diagnostic (&diagnostic);

}

/* An informative note at LOCATION.  Use this for additional details on an error

   message.  */

void

inform (location_t location, const char *gmsgid, ...)

{

  diagnostic_info diagnostic;

  va_list ap;

  va_start (ap, gmsgid);

  diagnostic_set_info (&diagnostic, gmsgid, &ap, location, DK_NOTE);

  report_diagnostic (&diagnostic);

  va_end (ap);

}

/* An informative note at LOCATION.  Use this for additional details on an

   error message.  */

void

inform_n (location_t location, int n, const char *singular_gmsgid,

          const char *plural_gmsgid, ...)

{

  diagnostic_info diagnostic;

  va_list ap;

  va_start (ap, plural_gmsgid);

  diagnostic_set_info_translated (&diagnostic,

                                  ngettext (singular_gmsgid, plural_gmsgid, n),

                                  &ap, location, DK_NOTE);

  report_diagnostic (&diagnostic);

  va_end (ap);

}

/* A warning at INPUT_LOCATION.  Use this for code which is correct according

   to the relevant language specification but is likely to be buggy anyway.

   Returns true if the warning was printed, false if it was inhibited.  */

bool

warning (int opt, const char *gmsgid, ...)

{

  diagnostic_info diagnostic;

  va_list ap;

  va_start (ap, gmsgid);

  diagnostic_set_info (&diagnostic, gmsgid, &ap, input_location, DK_WARNING);

  diagnostic.option_index = opt;

  va_end (ap);

  return report_diagnostic (&diagnostic);

}

/* A warning at LOCATION.  Use this for code which is correct according to the

   relevant language specification but is likely to be buggy anyway.