sim/igen/lf.c

/* The IGEN simulator generator for GDB, the GNU Debugger.

   Copyright 2002-2023 Free Software Foundation, Inc.

   Contributed by Andrew Cagney.

   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 <stdbool.h>
#include <stdio.h>
#include <stdarg.h>
#include <ctype.h>

#include "misc.h"
#include "lf.h"

#include <stdlib.h>
#include <string.h>

struct _lf
{
  FILE *stream;
  int line_nr;			/* nr complete lines written, curr line is line_nr+1 */
  int indent;
  int line_blank;
  const char *name;		/* Output name with diagnostics.  */
  const char *filename;		/* Output filename.  */
  char *tmpname;		/* Temporary output filename.  */
  const char *program;
  lf_file_references references;
  lf_file_type type;
};


lf *
lf_open (const char *name,
	 const char *real_name,
	 lf_file_references references,
	 lf_file_type type, const char *program)
{
  /* create a file object */
  lf *new_lf = ZALLOC (lf);
  ASSERT (new_lf != NULL);
  new_lf->references = references;
  new_lf->type = type;
  new_lf->name = (real_name == NULL ? name : real_name);
  new_lf->filename = name;
  new_lf->program = program;
  /* attach to stdout if pipe */
  if (!strcmp (name, "-"))
    {
      new_lf->stream = stdout;
    }
  else
    {
      /* create a new file */
      char *tmpname = zalloc (strlen (name) + 5);
      sprintf (tmpname, "%s.tmp", name);
      new_lf->filename = name;
      new_lf->tmpname = tmpname;
      new_lf->stream = fopen (tmpname, "w+");
      if (new_lf->stream == NULL)
	{
	  perror (name);
	  exit (1);
	}
    }
  return new_lf;
}


lf_file_type
lf_get_file_type (const lf *file)
{
  return file->type;
}


void
lf_close (lf *file)
{
  FILE *fp;
  bool update = true;

  /* If we wrote to stdout, no house keeping needed.  */
  if (file->stream == stdout)
    return;

  /* Rename the temp file to the real file if it's changed.  */
  fp = fopen (file->filename, "r");
  if (fp != NULL)
    {
      off_t len;

      fseek (fp, 0, SEEK_END);
      len = ftell (fp);

      if (len == ftell (file->stream))
	{
	  off_t off;
	  size_t cnt;
	  char *oldbuf = zalloc (len);
	  char *newbuf = zalloc (len);

	  rewind (fp);
	  off = 0;
	  while ((cnt = fread (oldbuf + off, 1, len - off, fp)) > 0)
	    off += cnt;
	  ASSERT (off == len);

	  rewind (file->stream);
	  off = 0;
	  while ((cnt = fread (newbuf + off, 1, len - off, file->stream)) > 0)
	    off += cnt;
	  ASSERT (off == len);

	  if (memcmp (oldbuf, newbuf, len) == 0)
	    update = false;
	}

      fclose (fp);
    }

  if (fclose (file->stream))
    {
      perror ("lf_close.fclose");
      exit (1);
    }

  if (update)
    {
      if (rename (file->tmpname, file->filename) != 0)
	{
	  perror ("lf_close.rename");
	  exit (1);
	}
    }
  else
    {
      if (remove (file->tmpname) != 0)
	{
	  perror ("lf_close.unlink");
	  exit (1);
	}
    }

  free (file->tmpname);
  free (file);
}


int
lf_putchr (lf *file, const char chr)
{
  int nr = 0;
  if (chr == '\n')
    {
      file->line_nr += 1;
      file->line_blank = 1;
    }
  else if (file->line_blank)
    {
      int pad;
      for (pad = file->indent; pad > 0; pad--)
	putc (' ', file->stream);
      nr += file->indent;
      file->line_blank = 0;
    }
  putc (chr, file->stream);
  nr += 1;
  return nr;
}

int
lf_write (lf *file, const char *string, int strlen_string)
{
  int nr = 0;
  int i;
  for (i = 0; i < strlen_string; i++)
    nr += lf_putchr (file, string[i]);
  return nr;
}


void
lf_indent_suppress (lf *file)
{
  file->line_blank = 0;
}


int
lf_putstr (lf *file, const char *string)
{
  int nr = 0;
  const char *chp;
  if (string != NULL)
    {
      for (chp = string; *chp != '\0'; chp++)
	{
	  nr += lf_putchr (file, *chp);
	}
    }
  return nr;
}

static int
do_lf_putunsigned (lf *file, unsigned u)
{
  int nr = 0;
  if (u > 0)
    {
      nr += do_lf_putunsigned (file, u / 10);
      nr += lf_putchr (file, (u % 10) + '0');
    }
  return nr;
}


int
lf_putint (lf *file, int decimal)
{
  int nr = 0;
  if (decimal == 0)
    nr += lf_putchr (file, '0');
  else if (decimal < 0)
    {
      nr += lf_putchr (file, '-');
      nr += do_lf_putunsigned (file, -decimal);
    }
  else if (decimal > 0)
    {
      nr += do_lf_putunsigned (file, decimal);
    }
  else
    ASSERT (0);
  return nr;
}


int
lf_printf (lf *file, const char *fmt, ...)
{
  int nr = 0;
  char buf[1024];
  va_list ap;

  va_start (ap, fmt);
  vsprintf (buf, fmt, ap);
  /* FIXME - this is really stuffed but so is vsprintf() on a sun! */
  ASSERT (strlen (buf) < sizeof (buf));
  nr += lf_putstr (file, buf);
  va_end (ap);
  return nr;
}


int
lf_print__line_ref (lf *file, const line_ref *line)
{
  return lf_print__external_ref (file, line->line_nr, line->file_name);
}

int
lf_print__external_ref (lf *file, int line_nr, const char *file_name)
{
  int nr = 0;
  switch (file->references)
    {
    case lf_include_references:
      lf_indent_suppress (file);
      nr += lf_putstr (file, "#line ");
      nr += lf_putint (file, line_nr);
      nr += lf_putstr (file, " \"");
      nr += lf_putstr (file, file_name);
      nr += lf_putstr (file, "\"\n");
      break;
    case lf_omit_references:
      nr += lf_putstr (file, "/* ");
      nr += lf_putstr (file, file_name);
      nr += lf_putstr (file, ":");
      nr += lf_putint (file, line_nr);
      nr += lf_putstr (file, "*/\n");
      break;
    }
  return nr;
}

int
lf_print__internal_ref (lf *file)
{
  int nr = 0;
  nr += lf_print__external_ref (file, file->line_nr + 2, file->name);
  /* line_nr == last_line, want to number from next */
  return nr;
}

void
lf_indent (lf *file, int delta)
{
  file->indent += delta;
}


int
lf_print__gnu_copyleft (lf *file)
{
  int nr = 0;
  switch (file->type)
    {
    case lf_is_c:
    case lf_is_h:
      nr += lf_printf (file, "\
/* This file is part of GDB.\n\
\n\
   Copyright 2002, 2007 Free Software Foundation, Inc.\n\
\n\
   This program is free software; you can redistribute it and/or modify\n\
   it under the terms of the GNU General Public License as published by\n\
   the Free Software Foundation; either version 3 of the License, or\n\
   (at your option) any later version.\n\
\n\
   This program is distributed in the hope that it will be useful,\n\
   but WITHOUT ANY WARRANTY; without even the implied warranty of\n\
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n\
   GNU General Public License for more details.\n\
\n\
   You should have received a copy of the GNU General Public License\n\
   along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\
\n\
   --\n\
\n\
   This file was generated by the program %s */\n\
", filter_filename (file->program));
      break;
    default:
      ASSERT (0);
      break;
    }
  return nr;
}


int
lf_putbin (lf *file, int decimal, int width)
{
  int nr = 0;
  int bit;
  ASSERT (width > 0);
  for (bit = 1 << (width - 1); bit != 0; bit >>= 1)
    {
      if (decimal & bit)
	nr += lf_putchr (file, '1');
      else
	nr += lf_putchr (file, '0');
    }
  return nr;
}

int
lf_print__this_file_is_empty (lf *file, const char *reason)
{
  int nr = 0;
  switch (file->type)
    {
    case lf_is_c:
    case lf_is_h:
      nr += lf_printf (file,
		       "/* This generated file (%s) is intentionally left blank",
		       file->name);
      if (reason != NULL)
	nr += lf_printf (file, " - %s", reason);
      nr += lf_printf (file, " */\n");
      break;
    default:
      ERROR ("Bad switch");
    }
  return nr;
}

int
lf_print__ucase_filename (lf *file)
{
  int nr = 0;
  const char *chp = file->name;
  while (*chp != '\0')
    {
      char ch = *chp;
      if (islower (ch))
	{
	  nr += lf_putchr (file, toupper (ch));
	}
      else if (ch == '.')
	nr += lf_putchr (file, '_');
      else
	nr += lf_putchr (file, ch);
      chp++;
    }
  return nr;
}

int
lf_print__file_start (lf *file)
{
  int nr = 0;
  switch (file->type)
    {
    case lf_is_h:
    case lf_is_c:
      nr += lf_print__gnu_copyleft (file);
      nr += lf_printf (file, "\n");
      nr += lf_printf (file, "#ifndef ");
      nr += lf_print__ucase_filename (file);
      nr += lf_printf (file, "\n");
      nr += lf_printf (file, "#define ");
      nr += lf_print__ucase_filename (file);
      nr += lf_printf (file, "\n");
      nr += lf_printf (file, "\n");
      break;
    default:
      ASSERT (0);
    }
  return nr;
}


int
lf_print__file_finish (lf *file)
{
  int nr = 0;
  switch (file->type)
    {
    case lf_is_h:
    case lf_is_c:
      nr += lf_printf (file, "\n");
      nr += lf_printf (file, "#endif /* _");
      nr += lf_print__ucase_filename (file);
      nr += lf_printf (file, "_*/\n");
      break;
    default:
      ASSERT (0);
    }
  return nr;
}


int
lf_print__function_type (lf *file,
			 const char *type,
			 const char *prefix, const char *trailing_space)
{
  int nr = 0;
  nr += lf_printf (file, "%s\\\n(%s)", prefix, type);
  if (trailing_space != NULL)
    nr += lf_printf (file, "%s", trailing_space);
  return nr;
}

int
lf_print__function_type_function (lf *file,
				  print_function * print_type,
				  const char *prefix,
				  const char *trailing_space)
{
  int nr = 0;
  nr += lf_printf (file, "%s\\\n(", prefix);
  nr += print_type (file);
  nr += lf_printf (file, ")");
  if (trailing_space != NULL)
    nr += lf_printf (file, "%s", trailing_space);
  return nr;
}