path: root/gcc/pretty-print.c

/* Various declarations for language-independent pretty-print subroutines.
   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   Contributed by Gabriel Dos Reis <gdr@integrable-solutions.net>

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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */

#include "config.h"
#undef FLOAT /* This is for hpux. They should change hpux.  */
#undef FFS  /* Some systems define this in param.h.  */
#include "system.h"
#include "coretypes.h"
#include "intl.h"
#include "pretty-print.h"
#include "tree.h"

#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free  free

/* A pointer to the formatted diagnostic message.  */
#define pp_formatted_text_data(PP) \
   ((const char *) obstack_base (&pp_base (PP)->buffer->obstack))

/* Format an integer given by va_arg (ARG, type-specifier T) where
   type-specifier is a precision modifier as indicated by PREC.  F is
   a string used to construct the appropriate format-specifier.  */
#define pp_integer_with_precision(PP, ARG, PREC, T, F)       \
  do                                                         \
    switch (PREC)                                            \
      {                                                      \
      case 0:                                                \
        pp_scalar (PP, "%" F, va_arg (ARG, T));              \
        break;                                               \
                                                             \
      case 1:                                                \
        pp_scalar (PP, "%l" F, va_arg (ARG, long T));        \
        break;                                               \
                                                             \
      case 2:                                                \
        pp_scalar (PP, "%ll" F, va_arg (ARG, long long T));  \
        break;                                               \
                                                             \
      default:                                               \
        break;                                               \
      }                                                      \
  while (0)


/* Subroutine of pp_set_maximum_length.  Set up PRETTY-PRINTER's
   internal maximum characters per line.  */
static void
pp_set_real_maximum_length (pretty_printer *pp)
{
  /* If we're told not to wrap lines then do the obvious thing.  In case
     we'll emit prefix only once per message, it is appropriate
     not to increase unnecessarily the line-length cut-off.  */
  if (!pp_is_wrapping_line (pp)
      || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_ONCE
      || pp_prefixing_rule (pp) == DIAGNOSTICS_SHOW_PREFIX_NEVER)
    pp->maximum_length = pp_line_cutoff (pp);
  else
    {
      int prefix_length = pp->prefix ? strlen (pp->prefix) : 0;
      /* If the prefix is ridiculously too long, output at least
         32 characters.  */
      if (pp_line_cutoff (pp) - prefix_length < 32)
	pp->maximum_length = pp_line_cutoff (pp) + 32;
      else
	pp->maximum_length = pp_line_cutoff (pp);
    }
}

/* Clear PRETTY-PRINTER's output state.  */
static inline void
pp_clear_state (pretty_printer *pp)
{
  pp->emitted_prefix = false;
  pp_indentation (pp) = 0;
}

/* Flush the formatted text of PRETTY-PRINTER onto the attached stream.  */
void
pp_write_text_to_stream (pretty_printer *pp)
{
  const char *text = pp_formatted_text (pp);
  fputs (text, pp->buffer->stream);
  pp_clear_output_area (pp);
}

/* Wrap a text delimited by START and END into PRETTY-PRINTER.  */
static void
pp_wrap_text (pretty_printer *pp, const char *start, const char *end)
{
  bool wrapping_line = pp_is_wrapping_line (pp);

  while (start != end)
    {
      /* Dump anything bordered by whitespaces.  */
      {
	const char *p = start;
	while (p != end && !ISBLANK (*p) && *p != '\n')
	  ++p;
	if (wrapping_line
            && p - start >= pp_remaining_character_count_for_line (pp))
	  pp_newline (pp);
	pp_append_text (pp, start, p);
	start = p;
      }

      if (start != end && ISBLANK (*start))
	{
	  pp_space (pp);
	  ++start;
	}
      if (start != end && *start == '\n')
	{
	  pp_newline (pp);
	  ++start;
	}
    }
}

/* Same as pp_wrap_text but wrap text only when in line-wrapping mode.  */
static inline void
pp_maybe_wrap_text (pretty_printer *pp, const char *start, const char *end)
{
  if (pp_is_wrapping_line (pp))
    pp_wrap_text (pp, start, end);
  else
    pp_append_text (pp, start, end);
}

/* Append to the output area of PRETTY-PRINTER a string specified by its
   STARTing character and LENGTH.  */
static inline void
pp_append_r (pretty_printer *pp, const char *start, int length)
{
  obstack_grow (&pp->buffer->obstack, start, length);
  pp->buffer->line_length += length;
}

/* Insert enough spaces into the output area of PRETTY-PRINTER to bring
   the column position to the current indentation level, assuming that a
   newline has just been written to the buffer.  */
void
pp_base_indent (pretty_printer *pp)
{
  int n = pp_indentation (pp);
  int i;

  for (i = 0; i < n; ++i)
    pp_space (pp);
}

/* Prepare PP to format a message pointed to by TEXT, with tentative
   location LOCUS.  It is expected that a call to pp_format_text with
   exactly the same PP and TEXT arguments will follow.  This routine
   may modify the data in memory at TEXT and LOCP, and if it does,
   caller is expected to notice.

   Currently, all this does is notice a %H or %J escape at the beginning
   of the string, and update LOCUS to match.  */
void
pp_base_prepare_to_format (pretty_printer *pp ATTRIBUTE_UNUSED,
			   text_info *text,
			   location_t *locus)
{
  const char *p = text->format_spec;
  tree t;

  /* Extract the location information if any.  */
  if (p[0] == '%')
    switch (p[1])
      {
      case 'H':
	*locus = *va_arg (*text->args_ptr, location_t *);
	text->format_spec = p + 2;
	break;

      case 'J':
	t = va_arg (*text->args_ptr, tree);
	*locus = DECL_SOURCE_LOCATION (t);
	text->format_spec = p + 2;
	break;
      }
}


/* Format a message pointed to by TEXT.  The following format specifiers are
   recognized as being client independent:
   %d, %i: (signed) integer in base ten.
   %u: unsigned integer in base ten.
   %o: unsigned integer in base eight.
   %x: unsigned integer in base sixteen.
   %ld, %li, %lo, %lu, %lx: long versions of the above.
   %lld, %lli, %llo, %llu, %llx: long long versions.
   %wd, %wi, %wo, %wu, %wx: HOST_WIDE_INT versions.
   %c: character.
   %s: string.
   %p: pointer.
   %m: strerror(text->err_no) - does not consume a value from args_ptr.
   %%: '%'.
   %<: opening quote.
   %>: closing quote.
   %': apostrophe (should only be used in untranslated messages;
       translations should use appropriate punctuation directly).
   %.*s: a substring the length of which is specified by an integer.
   %H: location_t.
   Flag 'q': quote formatted text (must come immediately after '%').  */
void
pp_base_format_text (pretty_printer *pp, text_info *text)
{
  for (; *text->format_spec; ++text->format_spec)
    {
      int precision = 0;
      bool wide = false;
      bool quoted = false;

      /* Ignore text.  */
      {
	const char *p = text->format_spec;
	while (*p && *p != '%')
	  ++p;
	pp_wrap_text (pp, text->format_spec, p);
        text->format_spec = p;
      }

      if (*text->format_spec == '\0')
	break;

      /* We got a '%'.  Check for 'q', then parse precision modifiers,
	 if any.  */
      if (*++text->format_spec == 'q')
	{
	  quoted = true;
	  ++text->format_spec;
	}
      switch (*text->format_spec)
        {
        case 'w':
          wide = true;
          ++text->format_spec;
          break;

        case 'l':
          do
            ++precision;
          while (*++text->format_spec == 'l');
          break;

        default:
          break;
        }
      /* We don't support precision beyond that of "long long".  */
      gcc_assert (precision <= 2);

      if (quoted)
	pp_string (pp, open_quote);
      switch (*text->format_spec)
	{
	case 'c':
	  pp_character (pp, va_arg (*text->args_ptr, int));
	  break;

	case 'd':
	case 'i':
          if (wide)
            pp_wide_integer (pp, va_arg (*text->args_ptr, HOST_WIDE_INT));
          else
            pp_integer_with_precision
              (pp, *text->args_ptr, precision, int, "d");
	  break;

	case 'o':
          if (wide)
            pp_scalar (pp, "%" HOST_WIDE_INT_PRINT "o",
                       va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
          else
            pp_integer_with_precision
              (pp, *text->args_ptr, precision, unsigned, "u");
	  break;

	case 's':
	  pp_string (pp, va_arg (*text->args_ptr, const char *));
	  break;

        case 'p':
          pp_pointer (pp, va_arg (*text->args_ptr, void *));
          break;

	case 'u':
          if (wide)
            pp_scalar (pp, HOST_WIDE_INT_PRINT_UNSIGNED,
                       va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
          else
            pp_integer_with_precision
              (pp, *text->args_ptr, precision, unsigned, "u");
	  break;

	case 'x':
          if (wide)
            pp_scalar (pp, HOST_WIDE_INT_PRINT_HEX,
                       va_arg (*text->args_ptr, unsigned HOST_WIDE_INT));
          else
            pp_integer_with_precision
              (pp, *text->args_ptr, precision, unsigned, "x");
	  break;

	case 'm':
	  pp_string (pp, xstrerror (text->err_no));
	  break;

	case '%':
	  pp_character (pp, '%');
	  break;

	case '<':
	  pp_string (pp, open_quote);
	  break;

	case '>':
	case '\'':
	  pp_string (pp, close_quote);
	  break;

        case 'H':
          {
            location_t *locus = va_arg (*text->args_ptr, location_t *);
	    expanded_location s = expand_location (*locus);
            pp_string (pp, "file '");
            pp_string (pp, s.file);
            pp_string (pp, "', line ");
            pp_decimal_int (pp, s.line);
          }
          break;

	case '.':
	  {
	    int n;
	    const char *s;
	    /* We handle no precision specifier but '%.*s'.  */
	    ++text->format_spec;
	    gcc_assert (*text->format_spec == '*');
	    ++text->format_spec;
	    gcc_assert (*text->format_spec == 's');

	    n = va_arg (*text->args_ptr, int);
	    s = va_arg (*text->args_ptr, const char *);
	    pp_append_text (pp, s, s + n);
	  }
	  break;

	default:
          if (!pp_format_decoder (pp) || !(*pp_format_decoder (pp)) (pp, text))
	    {
	      /* Hmmm.  The client failed to install a format translator
                 but called us with an unrecognized format.  Or, maybe, the
                 translated string just contains an invalid format, or
                 has formats in the wrong order.  Sorry.  */
	      abort ();
	    }
	}
      if (quoted)
	pp_string (pp, close_quote);
    }
}

/* Helper subroutine of output_verbatim and verbatim. Do the appropriate
   settings needed by BUFFER for a verbatim formatting.  */
void
pp_base_format_verbatim (pretty_printer *pp, text_info *text)
{
  diagnostic_prefixing_rule_t rule = pp_prefixing_rule (pp);
  int line_cutoff = pp_line_cutoff (pp);

  /* Set verbatim mode.  */
  pp->prefixing_rule = DIAGNOSTICS_SHOW_PREFIX_NEVER;
  pp_line_cutoff (pp) = 0;
  /* Do the actual formatting.  */
  pp_format_text (pp, text);
  /* Restore previous settings.  */
  pp_prefixing_rule (pp) = rule;
  pp_line_cutoff (pp) = line_cutoff;
}

/* Flush the content of BUFFER onto the attached stream.  */
void
pp_base_flush (pretty_printer *pp)
{
  pp_write_text_to_stream (pp);
  pp_clear_state (pp);
  fputc ('\n', pp->buffer->stream);
  fflush (pp->buffer->stream);
  pp_needs_newline (pp) = false;
}

/* Sets the number of maximum characters per line PRETTY-PRINTER can
   output in line-wrapping mode.  A LENGTH value 0 suppresses
   line-wrapping.  */
void
pp_base_set_line_maximum_length (pretty_printer *pp, int length)
{
  pp_line_cutoff (pp) = length;
  pp_set_real_maximum_length (pp);
}

/* Clear PRETTY-PRINTER output area text info.  */
void
pp_base_clear_output_area (pretty_printer *pp)
{
  obstack_free (&pp->buffer->obstack, obstack_base (&pp->buffer->obstack));
  pp->buffer->line_length = 0;
}

/* Set PREFIX for PRETTY-PRINTER.  */
void
pp_base_set_prefix (pretty_printer *pp, const char *prefix)
{
  pp->prefix = prefix;
  pp_set_real_maximum_length (pp);
  pp->emitted_prefix = false;
  pp_indentation (pp) = 0;
}

/* Free PRETTY-PRINTER's prefix, a previously malloc()'d string.  */
void
pp_base_destroy_prefix (pretty_printer *pp)
{
  if (pp->prefix != NULL)
    {
      free ((char *) pp->prefix);
      pp->prefix = NULL;
    }
}

/* Write out PRETTY-PRINTER's prefix.  */
void
pp_base_emit_prefix (pretty_printer *pp)
{
  if (pp->prefix != NULL)
    {
      switch (pp_prefixing_rule (pp))
	{
	default:
	case DIAGNOSTICS_SHOW_PREFIX_NEVER:
	  break;

	case DIAGNOSTICS_SHOW_PREFIX_ONCE:
	  if (pp->emitted_prefix)
	    {
	      pp_base_indent (pp);
	      break;
	    }
	  pp_indentation (pp) += 3;
	  /* Fall through.  */

	case DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE:
	  {
	    int prefix_length = strlen (pp->prefix);
	    pp_append_r (pp, pp->prefix, prefix_length);
	    pp->emitted_prefix = true;
	  }
	  break;
	}
    }
}

/* Construct a PRETTY-PRINTER with PREFIX and of MAXIMUM_LENGTH
   characters per line.  */
void
pp_construct (pretty_printer *pp, const char *prefix, int maximum_length)
{
  memset (pp, 0, sizeof (pretty_printer));
  pp->buffer = xcalloc (1, sizeof (output_buffer));
  obstack_init (&pp->buffer->obstack);
  pp->buffer->stream = stderr;
  pp_line_cutoff (pp) = maximum_length;
  pp_prefixing_rule (pp) = DIAGNOSTICS_SHOW_PREFIX_ONCE;
  pp_set_prefix (pp, prefix);
}

/* Append a string delimited by START and END to the output area of
   PRETTY-PRINTER.  No line wrapping is done.  However, if beginning a
   new line then emit PRETTY-PRINTER's prefix and skip any leading
   whitespace if appropriate.  The caller must ensure that it is
   safe to do so.  */
void
pp_base_append_text (pretty_printer *pp, const char *start, const char *end)
{
  /* Emit prefix and skip whitespace if we're starting a new line.  */
  if (pp->buffer->line_length == 0)
    {
      pp_emit_prefix (pp);
      if (pp_is_wrapping_line (pp))
	while (start != end && *start == ' ')
	  ++start;
    }
  pp_append_r (pp, start, end - start);
}

/* Finishes constructing a NULL-terminated character string representing
   the PRETTY-PRINTED text.  */
const char *
pp_base_formatted_text (pretty_printer *pp)
{
  obstack_1grow (&pp->buffer->obstack, '\0');
  return pp_formatted_text_data (pp);
}

/*  Return a pointer to the last character emitted in PRETTY-PRINTER's
    output area.  A NULL pointer means no character available.  */
const char *
pp_base_last_position_in_text (const pretty_printer *pp)
{
  const char *p = NULL;
  struct obstack *text = &pp->buffer->obstack;

  if (obstack_base (text) != obstack_next_free (text))
    p = ((const char *) obstack_next_free (text)) - 1;
  return p;
}

/* Return the amount of characters PRETTY-PRINTER can accept to
   make a full line.  Meaningful only in line-wrapping mode.  */
int
pp_base_remaining_character_count_for_line (pretty_printer *pp)
{
  return pp->maximum_length - pp->buffer->line_length;
}


/* Format a message into BUFFER a la printf.  */
void
pp_printf (pretty_printer *pp, const char *msg, ...)
{
  text_info text;
  va_list ap;

  va_start (ap, msg);
  text.err_no = errno;
  text.args_ptr = &ap;
  text.format_spec = msg;
  pp_format_text (pp, &text);
  va_end (ap);
}


/* Output MESSAGE verbatim into BUFFER.  */
void
pp_verbatim (pretty_printer *pp, const char *msg, ...)
{
  text_info text;
  va_list ap;

  va_start (ap, msg);
  text.err_no = errno;
  text.args_ptr = &ap;
  text.format_spec = msg;
  pp_format_verbatim (pp, &text);
  va_end (ap);
}



/* Have PRETTY-PRINTER start a new line.  */
void
pp_base_newline (pretty_printer *pp)
{
  obstack_1grow (&pp->buffer->obstack, '\n');
  pp->buffer->line_length = 0;
}

/* Have PRETTY-PRINTER add a CHARACTER.  */
void
pp_base_character (pretty_printer *pp, int c)
{
  if (pp_is_wrapping_line (pp)
      && pp_remaining_character_count_for_line (pp) <= 0)
    {
      pp_newline (pp);
      if (ISSPACE (c))
        return;
    }
  obstack_1grow (&pp->buffer->obstack, c);
  ++pp->buffer->line_length;
}

/* Append a STRING to the output area of PRETTY-PRINTER; the STRING may
   be line-wrapped if in appropriate mode.  */
void
pp_base_string (pretty_printer *pp, const char *str)
{
  pp_maybe_wrap_text (pp, str, str + (str ? strlen (str) : 0));
}

/* Maybe print out a whitespace if needed.  */

void
pp_base_maybe_space (pretty_printer *pp)
{
  if (pp_base (pp)->padding != pp_none)
    {
      pp_space (pp);
      pp_base (pp)->padding = pp_none;
    }
}