mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-10 12:53:03 +00:00
4eeb7bc9a2
bison fails when trying to output a parser and a header under the same name. * src/files.c (compute_output_file_names): Refuse when parser and header have the same name.
544 lines
15 KiB
C
544 lines
15 KiB
C
/* Open and close files for bison,
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Copyright 1984, 1986, 1989, 1992, 2000, 2001, 2002
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Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "system.h"
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#include "getargs.h"
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#include "quote.h"
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#include "files.h"
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#include "gram.h"
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#include "error.h"
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#include "complain.h"
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/* From basename.c. Almost a lie, as it returns a char *. */
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const char *base_name PARAMS ((char const *name));
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/* From xstrndup.c. */
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char *xstrndup PARAMS ((const char *s, size_t n));
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FILE *finput = NULL;
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struct obstack action_obstack;
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struct obstack attrs_obstack;
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struct obstack table_obstack;
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struct obstack defines_obstack;
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struct obstack guard_obstack;
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struct obstack output_obstack;
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char *spec_outfile = NULL; /* for -o. */
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char *spec_file_prefix = NULL; /* for -b. */
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char *spec_name_prefix = NULL; /* for -p. */
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char *spec_verbose_file = NULL; /* for --verbose. */
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char *spec_graph_file = NULL; /* for -g. */
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char *spec_defines_file = NULL; /* for --defines. */
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char *infile = NULL;
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char *attrsfile = NULL;
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static char *full_base_name = NULL;
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static char *short_base_name = NULL;
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/* C source file extension (the parser source). */
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const char *src_extension = NULL;
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/* Header file extension (if option ``-d'' is specified). */
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const char *header_extension = NULL;
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/*--------------------------.
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| Is SUFFIX ending STRING? |
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`--------------------------*/
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int
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strsuffix (const char *string, const char *suffix)
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{
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size_t string_len = strlen (string);
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size_t suffix_len = strlen (suffix);
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if (suffix_len <= string_len)
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return !strcmp (string + string_len - suffix_len, suffix);
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else
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return 0;
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}
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/*-----------------------------------------------------------------.
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| Return a newly allocated string composed of the concatenation of |
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| STRING1, and STRING2. |
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`-----------------------------------------------------------------*/
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static char *
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stringappend (const char *string1, const char *string2)
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{
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size_t len = strlen (string1) + strlen (string2);
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char *res = XMALLOC (char, len + 1);
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char *cp;
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cp = stpcpy (res, string1);
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cp = stpcpy (cp, string2);
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return res;
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}
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/*-----------------------------------------------------------------.
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| Computes the macro name used to avoid double inclusion in the |
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| header of the parser and store it in header_macro_name. Be sure |
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| to produce valid CPP names (don't start with digit, remain |
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| alphanumerical + underscore). |
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`-----------------------------------------------------------------*/
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static char *
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compute_header_macro (void)
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{
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const char *prefix = "BISON_";
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char *macro_name, *cp;
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if (spec_defines_file)
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{
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macro_name = XMALLOC (char,
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strlen (prefix) +
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strlen (spec_defines_file) + 1);
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cp = stpcpy (macro_name, prefix);
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cp = stpcpy (cp, spec_defines_file);
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}
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else
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{
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macro_name = XMALLOC (char,
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strlen (prefix) +
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strlen (full_base_name) +
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strlen (header_extension) + 1);
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cp = stpcpy (macro_name, prefix);
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cp = stpcpy (cp, full_base_name);
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cp = stpcpy (cp, header_extension);
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}
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for (cp = macro_name; *cp; ++cp)
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if (islower (*cp))
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*cp = toupper (*cp);
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else if (!isalnum (*cp))
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*cp = '_';
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return macro_name;
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}
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/*-----------------------------------------------------------------.
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| Try to open file NAME with mode MODE, and print an error message |
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| if fails. |
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`-----------------------------------------------------------------*/
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FILE *
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xfopen (const char *name, const char *mode)
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{
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FILE *ptr;
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ptr = fopen (name, mode);
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if (!ptr)
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error (2, errno, _("cannot open file `%s'"), name);
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return ptr;
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}
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/*-------------------------------------------------------------.
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| Try to close file PTR, and print an error message if fails. |
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`-------------------------------------------------------------*/
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int
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xfclose (FILE *ptr)
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{
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int result;
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if (ptr == NULL)
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return 0;
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result = fclose (ptr);
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if (result == EOF)
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error (2, errno, _("cannot close file"));
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return result;
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}
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/*--------------------------------------------------.
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| Save the content of the obstack OBS in FILENAME. |
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`--------------------------------------------------*/
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static void
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obstack_save (struct obstack *obs, const char *filename)
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{
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FILE *out = xfopen (filename, "w");
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size_t size = obstack_object_size (obs);
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fwrite (obstack_finish (obs), 1, size, out);
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xfclose (out);
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}
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/*---------------------------------------------------------------------.
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| Output double inclusion protection macros and saves defines_obstack |
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`---------------------------------------------------------------------*/
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static void
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defines_obstack_save (const char *filename)
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{
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FILE *out = xfopen (filename, "w");
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size_t size = obstack_object_size (&defines_obstack);
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char *macro_name = compute_header_macro ();
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fprintf (out, "#ifndef %s\n", macro_name);
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fprintf (out, "# define %s\n\n", macro_name);
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fwrite (obstack_finish (&defines_obstack), 1, size, out);
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fprintf (out, "\n#endif /* not %s */\n", macro_name);
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free (macro_name);
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xfclose (out);
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}
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/*------------------------------------------------------------------.
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| Return the path to the skeleton which locaction might be given in |
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| ENVVAR, otherwise return SKELETON_NAME. |
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`------------------------------------------------------------------*/
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const char *
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skeleton_find (const char *envvar, const char *skeleton_name)
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{
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const char *res = getenv (envvar);
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#if (defined (MSDOS) && !defined(__DJGPP__)) || defined (_WIN32)
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const char *cp = getenv ("INIT");
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if (!res)
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{
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/* Skeleton file name without path */
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const char *skel_name = strrchr (skeleton_name, '/');
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if (!skel_name)
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skel_name = strrchr (skeleton_name, '\\');
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if (!skel_name)
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skel_name = skeleton_name;
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else
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++skel_name;
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/* File doesn't exist in current directory; try in INIT directory. */
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if (cp)
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{
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res = XMALLOC (char, strlen (cp) + strlen (skel_name) + 2);
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sprintf (res, "%s%c%s", cp, '\\', skel_name);
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}
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else if (access (skel_name, 4) == 0) /* Look in current dir. */
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res = skel_name;
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else
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{
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/* Look in program locations dir. */
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extern char *program_name;
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cp = strrchr(program_name, '\\');
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if (!cp)
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return skeleton_name;
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else
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++cp;
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res = XMALLOC (char, cp - program_name + strlen (skel_name) + 1);
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strncpy (res, program_name, cp - program_name);
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strcpy (res + (cp - program_name), skel_name);
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}
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}
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#endif /* (defined (MSDOS) && !defined (__DJGPP__)) || defined (_WIN32) */
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if (!res)
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res = skeleton_name;
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return res;
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}
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/*----------------------------------------------------------------.
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| Compute BASE_NAME, SHORT_BASE_NAME and output files extensions. |
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`----------------------------------------------------------------*/
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/* Replace all characters FROM by TO in the string IN.
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and returns a new allocated string. */
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static char *
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tr (const char *in, char from, char to)
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{
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char *temp;
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char *out;
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out = XMALLOC (char, strlen (in) + 1);
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for (temp = out; *in; in++, out++)
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if (*in == from)
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*out = to;
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else
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*out = *in;
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*out = 0;
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return (temp);
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}
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/* Computes extensions from the grammar file extension. */
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static void
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compute_exts_from_gf (const char *ext)
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{
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src_extension = tr (ext, 'y', 'c');
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src_extension = tr (src_extension, 'Y', 'C');
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header_extension = tr (ext, 'y', 'h');
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header_extension = tr (header_extension, 'Y', 'H');
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}
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/* Computes extensions from the given c source file extension. */
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static void
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compute_exts_from_src (const char *ext)
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{
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/* We use this function when the user specifies `-o' or `--output',
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so the extenions must be computed unconditionally from the file name
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given by this option. */
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src_extension = xstrdup (ext);
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header_extension = tr (ext, 'c', 'h');
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header_extension = tr (header_extension, 'C', 'H');
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}
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/* Decompose FILENAME in four parts: *BASE, *TAB, and *EXT, the fourth
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part, (the directory) is ranging from FILENAME to the char before
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*BASE, so we don't need an additional parameter.
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*EXT points to the last period in the basename, or NULL if none.
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If there is no *EXT, *TAB is NULL. Otherwise, *TAB points to
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`.tab' or `_tab' if present right before *EXT, or is NULL. *TAB
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cannot be equal to *BASE.
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None are allocated, they are simply pointers to parts of FILENAME.
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Examples:
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'/tmp/foo.tab.c' -> *BASE = 'foo.tab.c', *TAB = '.tab.c', *EXT =
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'.c'
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'foo.c' -> *BASE = 'foo.c', *TAB = NULL, *EXT = '.c'
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'tab.c' -> *BASE = 'tab.c', *TAB = NULL, *EXT = '.c'
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'.tab.c' -> *BASE = '.tab.c', *TAB = NULL, *EXT = '.c'
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'foo.tab' -> *BASE = 'foo.tab', *TAB = NULL, *EXT = '.tab'
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'foo_tab' -> *BASE = 'foo_tab', *TAB = NULL, *EXT = NULL
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'foo' -> *BASE = 'foo', *TAB = NULL, *EXT = NULL. */
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static void
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filename_split (const char *filename,
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const char **base, const char **tab, const char **ext)
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{
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*base = base_name (filename);
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/* Look for the extension, i.e., look for the last dot. */
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*ext = strrchr (*base, '.');
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*tab = NULL;
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/* If there is an exentension, check if there is a `.tab' part right
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before. */
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if (*ext
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&& (*ext - *base) > (int) strlen (".tab")
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&& (!strncmp (*ext - strlen (".tab"), ".tab", strlen (".tab"))
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|| !strncmp (*ext - strlen ("_tab"), "_tab", strlen ("_tab"))))
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*tab = *ext - strlen (".tab");
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}
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/* FIXME: Should use xstrndup. */
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static void
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compute_base_names (void)
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{
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const char *base, *tab, *ext;
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/* If --output=foo.c was specified (SPEC_OUTFILE == foo.c),
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BASE_NAME and SHORT_BASE_NAME are `foo'.
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If --output=foo.tab.c was specified, BASE_NAME is `foo.tab' and
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SHORT_BASE_NAME is `foo'.
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The precise -o name will be used for FTABLE. For other output
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files, remove the ".c" or ".tab.c" suffix. */
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if (spec_outfile)
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{
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filename_split (spec_outfile, &base, &tab, &ext);
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/* The full base name goes up the EXT, excluding it. */
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full_base_name =
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xstrndup (spec_outfile,
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(strlen (spec_outfile) - (ext ? strlen (ext) : 0)));
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/* The short base name goes up to TAB, excluding it. */
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short_base_name =
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xstrndup (spec_outfile,
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(strlen (spec_outfile)
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- (tab ? strlen (tab) : (ext ? strlen (ext) : 0))));
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if (ext)
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compute_exts_from_src (ext);
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}
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/* If --file-prefix=foo was specified, FULL_BASE_NAME = `foo.tab'
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and SHORT_BASE_NAME = `foo'.
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Construct names from it. */
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else
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{
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if (spec_file_prefix)
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{
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/* If --file-prefix=foo was specified, SHORT_BASE_NAME =
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`foo'. */
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short_base_name = xstrdup (spec_file_prefix);
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}
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else if (yacc_flag)
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{
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/* If --yacc, then the output is `y.tab.c'. */
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short_base_name = xstrdup ("y");
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}
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else
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{
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/* Otherwise, the short base name is computed from the input
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grammar: `foo.yy' => `foo'. */
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filename_split (infile, &base, &tab, &ext);
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short_base_name =
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xstrndup (infile,
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(strlen (infile) - (ext ? strlen (ext) : 0)));
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}
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/* In these cases, always append `.tab'. */
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full_base_name = XMALLOC (char,
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strlen (short_base_name)
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+ strlen (EXT_TAB) + 1);
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stpcpy (stpcpy (full_base_name, short_base_name), EXT_TAB);
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/* Computes the extensions from the grammar file name. */
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filename_split (infile, &base, &tab, &ext);
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if (ext && !yacc_flag)
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compute_exts_from_gf (ext);
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}
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}
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/*-------------------------------------------------------.
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| Close the open files, compute the output files names. |
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`-------------------------------------------------------*/
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void
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compute_output_file_names (void)
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{
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compute_base_names ();
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/* If not yet done. */
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if (!src_extension)
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src_extension = ".c";
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if (!header_extension)
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header_extension = ".h";
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/* It the defines filename if not given, we create it. */
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if (!spec_defines_file)
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spec_defines_file = stringappend (full_base_name, header_extension);
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if (defines_flag)
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{
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/* This is really Q&D, but I don't want to spend time on issues
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which will be different with 1.50. */
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const char *parser_filename = NULL;
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if (spec_outfile)
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parser_filename = spec_outfile;
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else
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parser_filename = stringappend (full_base_name, src_extension);
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if (!strcmp (spec_defines_file, parser_filename))
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fatal ("header and parser would be both named %s",
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quote (parser_filename));
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}
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/* It the graph filename if not given, we create it. */
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if (!spec_graph_file)
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spec_graph_file = stringappend (short_base_name, ".vcg");
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spec_verbose_file = stringappend (short_base_name, EXT_OUTPUT);
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attrsfile = stringappend (short_base_name, EXT_STYPE_H);
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attrsfile = stringappend (attrsfile, EXT_TYPE (header_extension));
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}
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/*-----------------------------------------------------------------.
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| Open the input file. Look for the skeletons. Find the names of |
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| the output files. Prepare the obstacks. |
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`-----------------------------------------------------------------*/
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void
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open_files (void)
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{
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finput = xfopen (infile, "r");
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/* Initialize the obstacks. */
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obstack_init (&action_obstack);
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obstack_init (&attrs_obstack);
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obstack_init (&table_obstack);
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obstack_init (&defines_obstack);
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obstack_init (&guard_obstack);
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obstack_init (&output_obstack);
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}
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/*-----------------------.
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| Close the open file.. |
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`-----------------------*/
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void
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close_files (void)
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{
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xfclose (finput);
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}
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/*---------------------------.
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| Produce the output files. |
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`---------------------------*/
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void
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output_files (void)
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{
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/* Output the main file. */
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if (spec_outfile)
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obstack_save (&table_obstack, spec_outfile);
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else
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obstack_save (&table_obstack,
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stringappend (full_base_name, src_extension));
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obstack_free (&table_obstack, NULL);
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/* Output the header file if wanted. */
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if (defines_flag)
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defines_obstack_save (spec_defines_file);
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obstack_free (&defines_obstack, NULL);
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/* If we output only the table, dump the actions in ACTFILE. */
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if (no_parser_flag)
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obstack_save (&action_obstack, stringappend (short_base_name, ".act"));
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obstack_free (&action_obstack, NULL);
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/* If we produced a semantic parser ATTRS_OBSTACK must be dumped
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into its own file, ATTTRSFILE. */
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if (semantic_parser)
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{
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char *temp_name;
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obstack_save (&attrs_obstack, attrsfile);
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||
obstack_free (&attrs_obstack, NULL);
|
||
temp_name = stringappend (short_base_name, EXT_GUARD_C);
|
||
temp_name = stringappend (temp_name, EXT_TYPE (src_extension));
|
||
obstack_save (&guard_obstack, temp_name);
|
||
obstack_free (&guard_obstack, NULL);
|
||
}
|
||
}
|