477 lines
13 KiB
C
477 lines
13 KiB
C
/* CPP main program, using CPP Library.
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Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Written by Per Bothner, 1994-95.
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This program 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 the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU 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 this program; if not, write to the Free Software
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Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "intl.h"
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/* Encapsulates state used to convert the stream of tokens coming from
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cpp_get_token back into a text file. */
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struct printer
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{
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FILE *outf; /* Stream to write to. */
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const struct line_map *map; /* Logical to physical line mappings. */
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const cpp_token *prev; /* Previous token. */
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const cpp_token *source; /* Source token for spacing. */
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unsigned int line; /* Line currently being written. */
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unsigned char printed; /* Nonzero if something output at line. */
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};
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int main PARAMS ((int, char **));
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static void general_init PARAMS ((const char *));
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static void do_preprocessing PARAMS ((int, char **));
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static void setup_callbacks PARAMS ((void));
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/* General output routines. */
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static void scan_translation_unit PARAMS ((cpp_reader *));
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static void check_multiline_token PARAMS ((const cpp_string *));
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static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
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static void print_line PARAMS ((const struct line_map *, unsigned int,
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const char *));
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static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
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/* Callback routines for the parser. Most of these are active only
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in specific modes. */
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static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
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static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
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static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
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static void cb_include PARAMS ((cpp_reader *, unsigned int,
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const unsigned char *, const cpp_token *));
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static void cb_ident PARAMS ((cpp_reader *, unsigned int,
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const cpp_string *));
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static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
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static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
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const char *progname; /* Needs to be global. */
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static cpp_reader *pfile; /* An opaque handle. */
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static cpp_options *options; /* Options of pfile. */
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static struct printer print;
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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general_init (argv[0]);
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/* Construct a reader with default language GNU C89. */
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pfile = cpp_create_reader (CLK_GNUC89);
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options = cpp_get_options (pfile);
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do_preprocessing (argc, argv);
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if (cpp_destroy (pfile))
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return FATAL_EXIT_CODE;
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return SUCCESS_EXIT_CODE;
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}
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/* Store the program name, and set the locale. */
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static void
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general_init (argv0)
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const char *argv0;
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{
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progname = argv0 + strlen (argv0);
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while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
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--progname;
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xmalloc_set_program_name (progname);
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hex_init ();
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gcc_init_libintl ();
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}
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/* Handle switches, preprocess and output. */
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static void
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do_preprocessing (argc, argv)
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int argc;
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char **argv;
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{
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int argi = 1; /* Next argument to handle. */
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argi += cpp_handle_options (pfile, argc - argi , argv + argi);
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if (CPP_FATAL_ERRORS (pfile))
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return;
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if (argi < argc)
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{
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cpp_fatal (pfile, "invalid option %s", argv[argi]);
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return;
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}
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cpp_post_options (pfile);
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if (CPP_FATAL_ERRORS (pfile))
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return;
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/* If cpp_handle_options saw --help or --version on the command
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line, it will have set pfile->help_only to indicate this. Exit
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successfully. [The library does not exit itself, because
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e.g. cc1 needs to print its own --help message at this point.] */
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if (options->help_only)
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return;
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/* Initialize the printer structure. Setting print.line to -1 here
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is a trick to guarantee that the first token of the file will
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cause a linemarker to be output by maybe_print_line. */
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print.line = (unsigned int) -1;
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print.printed = 0;
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print.prev = 0;
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print.map = 0;
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/* Open the output now. We must do so even if no_output is on,
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because there may be other output than from the actual
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preprocessing (e.g. from -dM). */
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if (options->out_fname[0] == '\0')
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print.outf = stdout;
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else
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{
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print.outf = fopen (options->out_fname, "w");
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if (print.outf == NULL)
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{
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cpp_notice_from_errno (pfile, options->out_fname);
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return;
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}
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}
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setup_callbacks ();
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if (cpp_read_main_file (pfile, options->in_fname, NULL))
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{
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cpp_finish_options (pfile);
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/* A successful cpp_read_main_file guarantees that we can call
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cpp_scan_nooutput or cpp_get_token next. */
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if (options->no_output)
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cpp_scan_nooutput (pfile);
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else
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scan_translation_unit (pfile);
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/* -dM command line option. Should this be in cpp_finish? */
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if (options->dump_macros == dump_only)
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cpp_forall_identifiers (pfile, dump_macro, NULL);
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cpp_finish (pfile);
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}
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/* Flush any pending output. */
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if (print.printed)
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putc ('\n', print.outf);
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if (ferror (print.outf) || fclose (print.outf))
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cpp_notice_from_errno (pfile, options->out_fname);
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}
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/* Set up the callbacks as appropriate. */
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static void
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setup_callbacks ()
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{
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cpp_callbacks *cb = cpp_get_callbacks (pfile);
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if (! options->no_output)
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{
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cb->line_change = cb_line_change;
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cb->ident = cb_ident;
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cb->def_pragma = cb_def_pragma;
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if (! options->no_line_commands)
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cb->file_change = cb_file_change;
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}
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if (options->dump_includes)
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cb->include = cb_include;
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if (options->dump_macros == dump_names
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|| options->dump_macros == dump_definitions)
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{
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cb->define = cb_define;
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cb->undef = cb_undef;
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}
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}
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/* Writes out the preprocessed file, handling spacing and paste
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avoidance issues. */
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static void
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scan_translation_unit (pfile)
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cpp_reader *pfile;
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{
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bool avoid_paste = false;
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print.source = NULL;
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for (;;)
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{
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const cpp_token *token = cpp_get_token (pfile);
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if (token->type == CPP_PADDING)
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{
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avoid_paste = true;
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if (print.source == NULL
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|| (!(print.source->flags & PREV_WHITE)
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&& token->val.source == NULL))
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print.source = token->val.source;
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continue;
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}
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if (token->type == CPP_EOF)
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break;
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/* Subtle logic to output a space if and only if necessary. */
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if (avoid_paste)
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{
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if (print.source == NULL)
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print.source = token;
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if (print.source->flags & PREV_WHITE
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|| (print.prev && cpp_avoid_paste (pfile, print.prev, token))
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|| (print.prev == NULL && token->type == CPP_HASH))
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putc (' ', print.outf);
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}
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else if (token->flags & PREV_WHITE)
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putc (' ', print.outf);
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avoid_paste = false;
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print.source = NULL;
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print.prev = token;
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cpp_output_token (token, print.outf);
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if (token->type == CPP_STRING || token->type == CPP_WSTRING
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|| token->type == CPP_COMMENT)
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check_multiline_token (&token->val.str);
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}
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}
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/* Adjust print.line for newlines embedded in tokens. */
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static void
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check_multiline_token (str)
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const cpp_string *str;
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{
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unsigned int i;
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for (i = 0; i < str->len; i++)
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if (str->text[i] == '\n')
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print.line++;
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}
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/* If the token read on logical line LINE needs to be output on a
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different line to the current one, output the required newlines or
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a line marker, and return 1. Otherwise return 0. */
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static void
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maybe_print_line (map, line)
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const struct line_map *map;
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unsigned int line;
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{
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/* End the previous line of text. */
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if (print.printed)
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{
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putc ('\n', print.outf);
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print.line++;
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print.printed = 0;
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}
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if (line >= print.line && line < print.line + 8)
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{
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while (line > print.line)
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{
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putc ('\n', print.outf);
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print.line++;
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}
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}
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else
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print_line (map, line, "");
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}
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/* Output a line marker for logical line LINE. Special flags are "1"
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or "2" indicating entering or leaving a file. */
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static void
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print_line (map, line, special_flags)
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const struct line_map *map;
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unsigned int line;
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const char *special_flags;
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{
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/* End any previous line of text. */
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if (print.printed)
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putc ('\n', print.outf);
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print.printed = 0;
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print.line = line;
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if (! options->no_line_commands)
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{
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fprintf (print.outf, "# %u \"%s\"%s",
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SOURCE_LINE (map, print.line), map->to_file, special_flags);
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if (map->sysp == 2)
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fputs (" 3 4", print.outf);
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else if (map->sysp == 1)
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fputs (" 3", print.outf);
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putc ('\n', print.outf);
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}
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}
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/* Called when a line of output is started. TOKEN is the first token
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of the line, and at end of file will be CPP_EOF. */
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static void
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cb_line_change (pfile, token, parsing_args)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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const cpp_token *token;
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int parsing_args;
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{
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if (token->type == CPP_EOF || parsing_args)
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return;
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maybe_print_line (print.map, token->line);
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print.printed = 1;
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print.prev = 0;
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print.source = 0;
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/* Supply enough spaces to put this token in its original column,
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one space per column greater than 2, since scan_translation_unit
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will provide a space if PREV_WHITE. Don't bother trying to
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reconstruct tabs; we can't get it right in general, and nothing
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ought to care. Some things do care; the fault lies with them. */
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if (token->col > 2)
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{
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unsigned int spaces = token->col - 2;
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while (spaces--)
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putc (' ', print.outf);
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}
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}
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static void
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cb_ident (pfile, line, str)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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unsigned int line;
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const cpp_string * str;
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{
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maybe_print_line (print.map, line);
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fprintf (print.outf, "#ident \"%s\"\n", str->text);
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print.line++;
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}
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static void
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cb_define (pfile, line, node)
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cpp_reader *pfile;
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unsigned int line;
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cpp_hashnode *node;
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{
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maybe_print_line (print.map, line);
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fputs ("#define ", print.outf);
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/* -dD command line option. */
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if (options->dump_macros == dump_definitions)
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fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
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else
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fputs ((const char *) NODE_NAME (node), print.outf);
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putc ('\n', print.outf);
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print.line++;
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}
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static void
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cb_undef (pfile, line, node)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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unsigned int line;
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cpp_hashnode *node;
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{
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maybe_print_line (print.map, line);
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fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
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print.line++;
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}
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static void
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cb_include (pfile, line, dir, header)
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cpp_reader *pfile;
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unsigned int line;
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const unsigned char *dir;
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const cpp_token *header;
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{
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maybe_print_line (print.map, line);
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fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
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print.line++;
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}
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/* The file name, line number or system header flags have changed, as
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described in MAP. From this point on, the old print.map might be
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pointing to freed memory, and so must not be dereferenced. */
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static void
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cb_file_change (pfile, map)
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cpp_reader *pfile ATTRIBUTE_UNUSED;
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const struct line_map *map;
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{
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const char *flags = "";
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/* First time? */
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if (print.map == NULL)
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{
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/* Avoid printing foo.i when the main file is foo.c. */
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if (!options->preprocessed)
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print_line (map, map->from_line, flags);
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}
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else
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{
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/* Bring current file to correct line when entering a new file. */
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if (map->reason == LC_ENTER)
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maybe_print_line (map - 1, map->from_line - 1);
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if (map->reason == LC_ENTER)
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flags = " 1";
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else if (map->reason == LC_LEAVE)
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flags = " 2";
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print_line (map, map->from_line, flags);
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}
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print.map = map;
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}
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/* Copy a #pragma directive to the preprocessed output. */
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static void
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cb_def_pragma (pfile, line)
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cpp_reader *pfile;
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unsigned int line;
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{
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maybe_print_line (print.map, line);
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fputs ("#pragma ", print.outf);
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cpp_output_line (pfile, print.outf);
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print.line++;
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}
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/* Dump out the hash table. */
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static int
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dump_macro (pfile, node, v)
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cpp_reader *pfile;
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cpp_hashnode *node;
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void *v ATTRIBUTE_UNUSED;
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{
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if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
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{
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fputs ("#define ", print.outf);
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fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
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putc ('\n', print.outf);
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print.line++;
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}
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return 1;
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}
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