/* CPP main program, using CPP Library.
- Copyright (C) 1995 Free Software Foundation, Inc.
+ Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002
+ Free Software Foundation, Inc.
Written by Per Bothner, 1994-95.
This program is free software; you can redistribute it and/or modify it
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
+#include "config.h"
+#include "system.h"
#include "cpplib.h"
-#include <stdio.h>
+#include "intl.h"
-#ifndef EMACS
-#include "config.h"
-#endif /* not EMACS */
+/* Encapsulates state used to convert the stream of tokens coming from
+ cpp_get_token back into a text file. */
+struct printer
+{
+ FILE *outf; /* Stream to write to. */
+ const struct line_map *map; /* Logical to physical line mappings. */
+ const cpp_token *prev; /* Previous token. */
+ const cpp_token *source; /* Source token for spacing. */
+ unsigned int line; /* Line currently being written. */
+ unsigned char printed; /* Nonzero if something output at line. */
+};
-extern char *getenv ();
+int main PARAMS ((int, char **));
+static void general_init PARAMS ((const char *));
+static void do_preprocessing PARAMS ((int, char **));
+static void setup_callbacks PARAMS ((void));
-cpp_reader parse_in;
-cpp_options options;
+/* General output routines. */
+static void scan_translation_unit PARAMS ((cpp_reader *));
+static void check_multiline_token PARAMS ((const cpp_string *));
+static int dump_macro PARAMS ((cpp_reader *, cpp_hashnode *, void *));
-/* More 'friendly' abort that prints the line and file.
- config.h can #define abort fancy_abort if you like that sort of thing. */
+static void print_line PARAMS ((const struct line_map *, unsigned int,
+ const char *));
+static void maybe_print_line PARAMS ((const struct line_map *, unsigned int));
-void
-fancy_abort ()
-{
- fatal ("Internal gcc abort.");
-}
+/* Callback routines for the parser. Most of these are active only
+ in specific modes. */
+static void cb_line_change PARAMS ((cpp_reader *, const cpp_token *, int));
+static void cb_define PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
+static void cb_undef PARAMS ((cpp_reader *, unsigned int, cpp_hashnode *));
+static void cb_include PARAMS ((cpp_reader *, unsigned int,
+ const unsigned char *, const cpp_token *));
+static void cb_ident PARAMS ((cpp_reader *, unsigned int,
+ const cpp_string *));
+static void cb_file_change PARAMS ((cpp_reader *, const struct line_map *));
+static void cb_def_pragma PARAMS ((cpp_reader *, unsigned int));
+
+const char *progname; /* Needs to be global. */
+static cpp_reader *pfile; /* An opaque handle. */
+static cpp_options *options; /* Options of pfile. */
+static struct printer print;
-\f
int
main (argc, argv)
int argc;
char **argv;
{
- char *p;
- int i;
- int argi = 1; /* Next argument to handle. */
- struct cpp_options *opts = &options;
+ general_init (argv[0]);
- p = argv[0] + strlen (argv[0]);
- while (p != argv[0] && p[-1] != '/') --p;
- progname = p;
+ /* Construct a reader with default language GNU C89. */
+ pfile = cpp_create_reader (CLK_GNUC89);
+ options = cpp_get_options (pfile);
+
+ do_preprocessing (argc, argv);
- init_parse_file (&parse_in);
- parse_in.data = opts;
+ if (cpp_destroy (pfile))
+ return FATAL_EXIT_CODE;
+
+ return SUCCESS_EXIT_CODE;
+}
+
+/* Store the program name, and set the locale. */
+static void
+general_init (argv0)
+ const char *argv0;
+{
+ progname = argv0 + strlen (argv0);
+
+ while (progname != argv0 && ! IS_DIR_SEPARATOR (progname[-1]))
+ --progname;
+
+ xmalloc_set_program_name (progname);
+
+ hex_init ();
+ gcc_init_libintl ();
+}
+
+/* Handle switches, preprocess and output. */
+static void
+do_preprocessing (argc, argv)
+ int argc;
+ char **argv;
+{
+ int argi = 1; /* Next argument to handle. */
+
+ argi += cpp_handle_options (pfile, argc - argi , argv + argi);
+ if (CPP_FATAL_ERRORS (pfile))
+ return;
- init_parse_options (opts);
-
- argi += cpp_handle_options (&parse_in, argc - argi , argv + argi);
if (argi < argc)
- fatal ("Invalid option `%s'", argv[argi]);
- parse_in.show_column = 1;
+ {
+ cpp_fatal (pfile, "invalid option %s", argv[argi]);
+ return;
+ }
+
+ cpp_post_options (pfile);
+ if (CPP_FATAL_ERRORS (pfile))
+ return;
+
+ /* If cpp_handle_options saw --help or --version on the command
+ line, it will have set pfile->help_only to indicate this. Exit
+ successfully. [The library does not exit itself, because
+ e.g. cc1 needs to print its own --help message at this point.] */
+ if (options->help_only)
+ return;
+
+ /* Initialize the printer structure. Setting print.line to -1 here
+ is a trick to guarantee that the first token of the file will
+ cause a linemarker to be output by maybe_print_line. */
+ print.line = (unsigned int) -1;
+ print.printed = 0;
+ print.prev = 0;
+ print.map = 0;
+
+ /* Open the output now. We must do so even if no_output is on,
+ because there may be other output than from the actual
+ preprocessing (e.g. from -dM). */
+ if (options->out_fname[0] == '\0')
+ print.outf = stdout;
+ else
+ {
+ print.outf = fopen (options->out_fname, "w");
+ if (print.outf == NULL)
+ {
+ cpp_notice_from_errno (pfile, options->out_fname);
+ return;
+ }
+ }
+
+ setup_callbacks ();
+
+ if (cpp_read_main_file (pfile, options->in_fname, NULL))
+ {
+ cpp_finish_options (pfile);
+
+ /* A successful cpp_read_main_file guarantees that we can call
+ cpp_scan_nooutput or cpp_get_token next. */
+ if (options->no_output)
+ cpp_scan_nooutput (pfile);
+ else
+ scan_translation_unit (pfile);
+
+ /* -dM command line option. Should this be in cpp_finish? */
+ if (options->dump_macros == dump_only)
+ cpp_forall_identifiers (pfile, dump_macro, NULL);
+
+ cpp_finish (pfile);
+ }
+
+ /* Flush any pending output. */
+ if (print.printed)
+ putc ('\n', print.outf);
+
+ if (ferror (print.outf) || fclose (print.outf))
+ cpp_notice_from_errno (pfile, options->out_fname);
+}
+
+/* Set up the callbacks as appropriate. */
+static void
+setup_callbacks ()
+{
+ cpp_callbacks *cb = cpp_get_callbacks (pfile);
+
+ if (! options->no_output)
+ {
+ cb->line_change = cb_line_change;
+ cb->ident = cb_ident;
+ cb->def_pragma = cb_def_pragma;
+ if (! options->no_line_commands)
+ cb->file_change = cb_file_change;
+ }
- i = push_parse_file (&parse_in, opts->in_fname);
- if (i != SUCCESS_EXIT_CODE)
- return i;
+ if (options->dump_includes)
+ cb->include = cb_include;
- /* Now that we know the input file is valid, open the output. */
+ if (options->dump_macros == dump_names
+ || options->dump_macros == dump_definitions)
+ {
+ cb->define = cb_define;
+ cb->undef = cb_undef;
+ }
+}
- if (!opts->out_fname || !strcmp (opts->out_fname, ""))
- opts->out_fname = "stdout";
- else if (! freopen (opts->out_fname, "w", stdout))
- cpp_pfatal_with_name (&parse_in, opts->out_fname);
+/* Writes out the preprocessed file, handling spacing and paste
+ avoidance issues. */
+static void
+scan_translation_unit (pfile)
+ cpp_reader *pfile;
+{
+ bool avoid_paste = false;
+ print.source = NULL;
for (;;)
{
- enum cpp_token kind;
- if (! opts->no_output)
+ const cpp_token *token = cpp_get_token (pfile);
+
+ if (token->type == CPP_PADDING)
{
- fwrite (parse_in.token_buffer, 1, CPP_WRITTEN (&parse_in), stdout);
+ avoid_paste = true;
+ if (print.source == NULL
+ || (!(print.source->flags & PREV_WHITE)
+ && token->val.source == NULL))
+ print.source = token->val.source;
+ continue;
}
- parse_in.limit = parse_in.token_buffer;
- kind = cpp_get_token (&parse_in);
- if (kind == CPP_EOF)
+
+ if (token->type == CPP_EOF)
break;
+
+ /* Subtle logic to output a space if and only if necessary. */
+ if (avoid_paste)
+ {
+ if (print.source == NULL)
+ print.source = token;
+ if (print.source->flags & PREV_WHITE
+ || (print.prev && cpp_avoid_paste (pfile, print.prev, token))
+ || (print.prev == NULL && token->type == CPP_HASH))
+ putc (' ', print.outf);
+ }
+ else if (token->flags & PREV_WHITE)
+ putc (' ', print.outf);
+
+ avoid_paste = false;
+ print.source = NULL;
+ print.prev = token;
+ cpp_output_token (token, print.outf);
+
+ if (token->type == CPP_STRING || token->type == CPP_WSTRING
+ || token->type == CPP_COMMENT)
+ check_multiline_token (&token->val.str);
}
+}
+
+/* Adjust print.line for newlines embedded in tokens. */
+static void
+check_multiline_token (str)
+ const cpp_string *str;
+{
+ unsigned int i;
- cpp_finish (&parse_in);
+ for (i = 0; i < str->len; i++)
+ if (str->text[i] == '\n')
+ print.line++;
+}
+
+/* If the token read on logical line LINE needs to be output on a
+ different line to the current one, output the required newlines or
+ a line marker, and return 1. Otherwise return 0. */
+static void
+maybe_print_line (map, line)
+ const struct line_map *map;
+ unsigned int line;
+{
+ /* End the previous line of text. */
+ if (print.printed)
+ {
+ putc ('\n', print.outf);
+ print.line++;
+ print.printed = 0;
+ }
+
+ if (line >= print.line && line < print.line + 8)
+ {
+ while (line > print.line)
+ {
+ putc ('\n', print.outf);
+ print.line++;
+ }
+ }
+ else
+ print_line (map, line, "");
+}
+
+/* Output a line marker for logical line LINE. Special flags are "1"
+ or "2" indicating entering or leaving a file. */
+static void
+print_line (map, line, special_flags)
+ const struct line_map *map;
+ unsigned int line;
+ const char *special_flags;
+{
+ /* End any previous line of text. */
+ if (print.printed)
+ putc ('\n', print.outf);
+ print.printed = 0;
+
+ print.line = line;
+ if (! options->no_line_commands)
+ {
+ fprintf (print.outf, "# %u \"%s\"%s",
+ SOURCE_LINE (map, print.line), map->to_file, special_flags);
+
+ if (map->sysp == 2)
+ fputs (" 3 4", print.outf);
+ else if (map->sysp == 1)
+ fputs (" 3", print.outf);
+
+ putc ('\n', print.outf);
+ }
+}
+
+/* Called when a line of output is started. TOKEN is the first token
+ of the line, and at end of file will be CPP_EOF. */
+static void
+cb_line_change (pfile, token, parsing_args)
+ cpp_reader *pfile ATTRIBUTE_UNUSED;
+ const cpp_token *token;
+ int parsing_args;
+{
+ if (token->type == CPP_EOF || parsing_args)
+ return;
+
+ maybe_print_line (print.map, token->line);
+ print.printed = 1;
+ print.prev = 0;
+ print.source = 0;
+
+ /* Supply enough spaces to put this token in its original column,
+ one space per column greater than 2, since scan_translation_unit
+ will provide a space if PREV_WHITE. Don't bother trying to
+ reconstruct tabs; we can't get it right in general, and nothing
+ ought to care. Some things do care; the fault lies with them. */
+ if (token->col > 2)
+ {
+ unsigned int spaces = token->col - 2;
+
+ while (spaces--)
+ putc (' ', print.outf);
+ }
+}
+
+static void
+cb_ident (pfile, line, str)
+ cpp_reader *pfile ATTRIBUTE_UNUSED;
+ unsigned int line;
+ const cpp_string * str;
+{
+ maybe_print_line (print.map, line);
+ fprintf (print.outf, "#ident \"%s\"\n", str->text);
+ print.line++;
+}
+
+static void
+cb_define (pfile, line, node)
+ cpp_reader *pfile;
+ unsigned int line;
+ cpp_hashnode *node;
+{
+ maybe_print_line (print.map, line);
+ fputs ("#define ", print.outf);
+
+ /* -dD command line option. */
+ if (options->dump_macros == dump_definitions)
+ fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
+ else
+ fputs ((const char *) NODE_NAME (node), print.outf);
+
+ putc ('\n', print.outf);
+ print.line++;
+}
+
+static void
+cb_undef (pfile, line, node)
+ cpp_reader *pfile ATTRIBUTE_UNUSED;
+ unsigned int line;
+ cpp_hashnode *node;
+{
+ maybe_print_line (print.map, line);
+ fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
+ print.line++;
+}
+
+static void
+cb_include (pfile, line, dir, header)
+ cpp_reader *pfile;
+ unsigned int line;
+ const unsigned char *dir;
+ const cpp_token *header;
+{
+ maybe_print_line (print.map, line);
+ fprintf (print.outf, "#%s %s\n", dir, cpp_token_as_text (pfile, header));
+ print.line++;
+}
+
+/* The file name, line number or system header flags have changed, as
+ described in MAP. From this point on, the old print.map might be
+ pointing to freed memory, and so must not be dereferenced. */
+
+static void
+cb_file_change (pfile, map)
+ cpp_reader *pfile ATTRIBUTE_UNUSED;
+ const struct line_map *map;
+{
+ const char *flags = "";
+
+ /* First time? */
+ if (print.map == NULL)
+ {
+ /* Avoid printing foo.i when the main file is foo.c. */
+ if (!options->preprocessed)
+ print_line (map, map->from_line, flags);
+ }
+ else
+ {
+ /* Bring current file to correct line when entering a new file. */
+ if (map->reason == LC_ENTER)
+ maybe_print_line (map - 1, map->from_line - 1);
+
+ if (map->reason == LC_ENTER)
+ flags = " 1";
+ else if (map->reason == LC_LEAVE)
+ flags = " 2";
+ print_line (map, map->from_line, flags);
+ }
+
+ print.map = map;
+}
+
+/* Copy a #pragma directive to the preprocessed output. */
+static void
+cb_def_pragma (pfile, line)
+ cpp_reader *pfile;
+ unsigned int line;
+{
+ maybe_print_line (print.map, line);
+ fputs ("#pragma ", print.outf);
+ cpp_output_line (pfile, print.outf);
+ print.line++;
+}
+
+/* Dump out the hash table. */
+static int
+dump_macro (pfile, node, v)
+ cpp_reader *pfile;
+ cpp_hashnode *node;
+ void *v ATTRIBUTE_UNUSED;
+{
+ if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN))
+ {
+ fputs ("#define ", print.outf);
+ fputs ((const char *) cpp_macro_definition (pfile, node), print.outf);
+ putc ('\n', print.outf);
+ print.line++;
+ }
- if (parse_in.errors)
- exit (FATAL_EXIT_CODE);
- exit (SUCCESS_EXIT_CODE);
+ return 1;
}
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