497e80a371
of unnecessary path components that are relics of cvs2svn. (These are directory moves)
459 lines
13 KiB
C
459 lines
13 KiB
C
/* Preprocess only, using cpplib.
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Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "cpplib.h"
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#include "../libcpp/internal.h"
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#include "tree.h"
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#include "c-common.h" /* For flags. */
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#include "c-pragma.h" /* For parse_in. */
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/* Encapsulates state used to convert a stream of tokens into a text
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file. */
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static struct
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{
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FILE *outf; /* Stream to write to. */
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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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int src_line; /* Line number currently being written. */
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unsigned char printed; /* Nonzero if something output at line. */
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bool first_time; /* pp_file_change hasn't been called yet. */
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} print;
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/* General output routines. */
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static void scan_translation_unit (cpp_reader *);
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static void scan_translation_unit_trad (cpp_reader *);
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static void account_for_newlines (const unsigned char *, size_t);
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static int dump_macro (cpp_reader *, cpp_hashnode *, void *);
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static void print_line (source_location, const char *);
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static void maybe_print_line (source_location);
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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 (cpp_reader *, const cpp_token *, int);
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static void cb_define (cpp_reader *, source_location, cpp_hashnode *);
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static void cb_undef (cpp_reader *, source_location, cpp_hashnode *);
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static void cb_include (cpp_reader *, source_location, const unsigned char *,
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const char *, int, const cpp_token **);
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static void cb_ident (cpp_reader *, source_location, const cpp_string *);
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static void cb_def_pragma (cpp_reader *, source_location);
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static void cb_read_pch (cpp_reader *pfile, const char *name,
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int fd, const char *orig_name);
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/* Preprocess and output. */
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void
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preprocess_file (cpp_reader *pfile)
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{
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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 (flag_no_output)
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{
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/* Scan -included buffers, then the main file. */
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while (pfile->buffer->prev)
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cpp_scan_nooutput (pfile);
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cpp_scan_nooutput (pfile);
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}
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else if (cpp_get_options (pfile)->traditional)
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scan_translation_unit_trad (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 elsewhere? */
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if (flag_dump_macros == 'M')
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cpp_forall_identifiers (pfile, dump_macro, NULL);
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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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}
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/* Set up the callbacks as appropriate. */
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void
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init_pp_output (FILE *out_stream)
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{
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cpp_callbacks *cb = cpp_get_callbacks (parse_in);
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if (!flag_no_output)
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{
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cb->line_change = cb_line_change;
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/* Don't emit #pragma or #ident directives if we are processing
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assembly language; the assembler may choke on them. */
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if (cpp_get_options (parse_in)->lang != CLK_ASM)
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{
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cb->ident = cb_ident;
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cb->def_pragma = cb_def_pragma;
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}
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}
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if (flag_dump_includes)
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cb->include = cb_include;
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if (flag_pch_preprocess)
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{
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cb->valid_pch = c_common_valid_pch;
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cb->read_pch = cb_read_pch;
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}
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if (flag_dump_macros == 'N' || flag_dump_macros == 'D')
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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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/* Initialize the print structure. Setting print.src_line to -1 here is
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a trick to guarantee that the first token of the file will cause
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a linemarker to be output by maybe_print_line. */
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print.src_line = -1;
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print.printed = 0;
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print.prev = 0;
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print.outf = out_stream;
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print.first_time = 1;
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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 (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
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&& 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_COMMENT)
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account_for_newlines (token->val.str.text, token->val.str.len);
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}
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}
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/* Adjust print.src_line for newlines embedded in output. */
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static void
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account_for_newlines (const unsigned char *str, size_t len)
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{
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while (len--)
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if (*str++ == '\n')
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print.src_line++;
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}
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/* Writes out a traditionally preprocessed file. */
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static void
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scan_translation_unit_trad (cpp_reader *pfile)
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{
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while (_cpp_read_logical_line_trad (pfile))
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{
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size_t len = pfile->out.cur - pfile->out.base;
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maybe_print_line (pfile->out.first_line);
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fwrite (pfile->out.base, 1, len, print.outf);
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print.printed = 1;
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if (!CPP_OPTION (pfile, discard_comments))
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account_for_newlines (pfile->out.base, len);
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}
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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 (source_location src_loc)
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{
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const struct line_map *map = linemap_lookup (&line_table, src_loc);
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int src_line = SOURCE_LINE (map, src_loc);
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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.src_line++;
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print.printed = 0;
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}
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if (src_line >= print.src_line && src_line < print.src_line + 8)
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{
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while (src_line > print.src_line)
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{
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putc ('\n', print.outf);
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print.src_line++;
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}
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}
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else
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print_line (src_loc, "");
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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 (source_location src_loc, 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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if (!flag_no_line_commands)
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{
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const struct line_map *map = linemap_lookup (&line_table, src_loc);
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size_t to_file_len = strlen (map->to_file);
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unsigned char *to_file_quoted =
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(unsigned char *) alloca (to_file_len * 4 + 1);
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unsigned char *p;
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print.src_line = SOURCE_LINE (map, src_loc);
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/* cpp_quote_string does not nul-terminate, so we have to do it
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ourselves. */
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p = cpp_quote_string (to_file_quoted,
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(unsigned char *) map->to_file, to_file_len);
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*p = '\0';
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fprintf (print.outf, "# %u \"%s\"%s",
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print.src_line == 0 ? 1 : print.src_line,
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to_file_quoted, 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 (cpp_reader *pfile, const cpp_token *token,
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int parsing_args)
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{
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source_location src_loc = token->src_loc;
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if (token->type == CPP_EOF || parsing_args)
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return;
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maybe_print_line (src_loc);
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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 (!CPP_OPTION (pfile, traditional))
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{
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const struct line_map *map = linemap_lookup (&line_table, src_loc);
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int spaces = SOURCE_COLUMN (map, src_loc) - 2;
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print.printed = 1;
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while (-- spaces >= 0)
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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 (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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const cpp_string *str)
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{
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maybe_print_line (line);
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fprintf (print.outf, "#ident %s\n", str->text);
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print.src_line++;
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}
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static void
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cb_define (cpp_reader *pfile, source_location line, cpp_hashnode *node)
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{
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maybe_print_line (line);
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fputs ("#define ", print.outf);
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/* 'D' is whole definition; 'N' is name only. */
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if (flag_dump_macros == 'D')
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fputs ((const char *) cpp_macro_definition (pfile, node),
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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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if (linemap_lookup (&line_table, line)->to_line != 0)
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print.src_line++;
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}
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static void
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cb_undef (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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cpp_hashnode *node)
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{
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maybe_print_line (line);
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fprintf (print.outf, "#undef %s\n", NODE_NAME (node));
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print.src_line++;
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}
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static void
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cb_include (cpp_reader *pfile ATTRIBUTE_UNUSED, source_location line,
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const unsigned char *dir, const char *header, int angle_brackets,
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const cpp_token **comments)
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{
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maybe_print_line (line);
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if (angle_brackets)
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fprintf (print.outf, "#%s <%s>", dir, header);
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else
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fprintf (print.outf, "#%s \"%s\"", dir, header);
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if (comments != NULL)
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{
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while (*comments != NULL)
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{
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if ((*comments)->flags & PREV_WHITE)
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putc (' ', print.outf);
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cpp_output_token (*comments, print.outf);
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++comments;
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}
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}
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putc ('\n', print.outf);
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print.src_line++;
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}
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/* Callback called when -fworking-director and -E to emit working
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directory in cpp output file. */
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void
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pp_dir_change (cpp_reader *pfile ATTRIBUTE_UNUSED, const char *dir)
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{
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size_t to_file_len = strlen (dir);
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unsigned char *to_file_quoted =
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(unsigned char *) alloca (to_file_len * 4 + 1);
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unsigned char *p;
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/* cpp_quote_string does not nul-terminate, so we have to do it ourselves. */
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p = cpp_quote_string (to_file_quoted, (unsigned char *) dir, to_file_len);
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*p = '\0';
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fprintf (print.outf, "# 1 \"%s//\"\n", to_file_quoted);
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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. */
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void
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pp_file_change (const struct line_map *map)
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{
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const char *flags = "";
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if (flag_no_line_commands)
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return;
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if (map != NULL)
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{
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if (print.first_time)
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{
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/* Avoid printing foo.i when the main file is foo.c. */
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if (!cpp_get_options (parse_in)->preprocessed)
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print_line (map->start_location, flags);
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print.first_time = 0;
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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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{
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const struct line_map *from = INCLUDED_FROM (&line_table, map);
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maybe_print_line (LAST_SOURCE_LINE_LOCATION (from));
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}
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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->start_location, flags);
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}
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}
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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 (cpp_reader *pfile, source_location line)
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{
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maybe_print_line (line);
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fputs ("#pragma ", print.outf);
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cpp_output_line (pfile, print.outf);
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print.src_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 (cpp_reader *pfile, cpp_hashnode *node, 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),
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print.outf);
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putc ('\n', print.outf);
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print.src_line++;
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}
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return 1;
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}
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/* Load in the PCH file NAME, open on FD. It was originally searched for
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by ORIG_NAME. Also, print out a #include command so that the PCH
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file can be loaded when the preprocessed output is compiled. */
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static void
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cb_read_pch (cpp_reader *pfile, const char *name,
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int fd, const char *orig_name ATTRIBUTE_UNUSED)
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{
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c_common_read_pch (pfile, name, fd, orig_name);
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fprintf (print.outf, "#pragma GCC pch_preprocess \"%s\"\n", name);
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print.src_line++;
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}
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