713 lines
16 KiB
C
713 lines
16 KiB
C
/* This is the Assembler Pre-Processor
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Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it 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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GAS 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 GAS; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Modified by Allen Wirfs-Brock, Instantiations Inc 2/90 */
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/* App, the assembler pre-processor. This pre-processor strips out excess
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spaces, turns single-quoted characters into a decimal constant, and turns
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# <number> <filename> <garbage> into a .line <number>\n.file <filename>
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pair. This needs better error-handling.
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*/
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#include <stdio.h>
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#include "as.h" /* For BAD_CASE() only */
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#if (__STDC__ != 1) && !defined(const)
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#define const /* Nothing */
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#endif
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static char lex[256];
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static const char symbol_chars[] =
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"$._ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
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#define LEX_IS_SYMBOL_COMPONENT 1
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#define LEX_IS_WHITESPACE 2
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#define LEX_IS_LINE_SEPARATOR 3
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#define LEX_IS_COMMENT_START 4
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#define LEX_IS_LINE_COMMENT_START 5
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#define LEX_IS_TWOCHAR_COMMENT_1ST 6
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#define LEX_IS_TWOCHAR_COMMENT_2ND 7
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#define LEX_IS_STRINGQUOTE 8
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#define LEX_IS_COLON 9
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#define LEX_IS_NEWLINE 10
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#define LEX_IS_ONECHAR_QUOTE 11
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#define IS_SYMBOL_COMPONENT(c) (lex[c] == LEX_IS_SYMBOL_COMPONENT)
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#define IS_WHITESPACE(c) (lex[c] == LEX_IS_WHITESPACE)
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#define IS_LINE_SEPARATOR(c) (lex[c] == LEX_IS_LINE_SEPARATOR)
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#define IS_COMMENT(c) (lex[c] == LEX_IS_COMMENT_START)
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#define IS_LINE_COMMENT(c) (lex[c] == LEX_IS_LINE_COMMENT_START)
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#define IS_NEWLINE(c) (lex[c] == LEX_IS_NEWLINE)
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/* FIXME-soon: The entire lexer/parser thingy should be
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built statically at compile time rather than dynamically
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each and every time the assembler is run. xoxorich. */
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void
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do_scrub_begin ()
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{
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const char *p;
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lex[' '] = LEX_IS_WHITESPACE;
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lex['\t'] = LEX_IS_WHITESPACE;
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lex['\n'] = LEX_IS_NEWLINE;
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lex[';'] = LEX_IS_LINE_SEPARATOR;
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lex['"'] = LEX_IS_STRINGQUOTE;
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#ifndef TC_HPPA
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lex['\''] = LEX_IS_ONECHAR_QUOTE;
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#endif
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lex[':'] = LEX_IS_COLON;
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#ifdef SINGLE_QUOTE_STRINGS
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lex['\''] = LEX_IS_STRINGQUOTE;
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#endif
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/* Note that these override the previous defaults, e.g. if ';'
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is a comment char, then it isn't a line separator. */
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for (p = symbol_chars; *p; ++p)
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{
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lex[(unsigned char) *p] = LEX_IS_SYMBOL_COMPONENT;
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} /* declare symbol characters */
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for (p = comment_chars; *p; p++)
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{
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lex[(unsigned char) *p] = LEX_IS_COMMENT_START;
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} /* declare comment chars */
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for (p = line_comment_chars; *p; p++)
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{
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lex[(unsigned char) *p] = LEX_IS_LINE_COMMENT_START;
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} /* declare line comment chars */
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for (p = line_separator_chars; *p; p++)
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{
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lex[(unsigned char) *p] = LEX_IS_LINE_SEPARATOR;
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} /* declare line separators */
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/* Only allow slash-star comments if slash is not in use */
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if (lex['/'] == 0)
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{
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lex['/'] = LEX_IS_TWOCHAR_COMMENT_1ST;
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}
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/* FIXME-soon. This is a bad hack but otherwise, we
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can't do c-style comments when '/' is a line
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comment char. xoxorich. */
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if (lex['*'] == 0)
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{
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lex['*'] = LEX_IS_TWOCHAR_COMMENT_2ND;
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}
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} /* do_scrub_begin() */
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FILE *scrub_file;
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int
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scrub_from_file ()
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{
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return getc (scrub_file);
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}
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void
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scrub_to_file (ch)
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int ch;
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{
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ungetc (ch, scrub_file);
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} /* scrub_to_file() */
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char *scrub_string;
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char *scrub_last_string;
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int
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scrub_from_string ()
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{
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return scrub_string == scrub_last_string ? EOF : *scrub_string++;
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} /* scrub_from_string() */
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void
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scrub_to_string (ch)
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int ch;
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{
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*--scrub_string = ch;
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} /* scrub_to_string() */
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/* Saved state of the scrubber */
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static int state;
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static int old_state;
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static char *out_string;
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static char out_buf[20];
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static int add_newlines = 0;
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/* Data structure for saving the state of app across #include's. Note that
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app is called asynchronously to the parsing of the .include's, so our
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state at the time .include is interpreted is completely unrelated.
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That's why we have to save it all. */
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struct app_save
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{
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int state;
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int old_state;
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char *out_string;
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char out_buf[sizeof (out_buf)];
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int add_newlines;
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char *scrub_string;
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char *scrub_last_string;
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FILE *scrub_file;
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};
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char *
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app_push ()
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{
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register struct app_save *saved;
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saved = (struct app_save *) xmalloc (sizeof (*saved));
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saved->state = state;
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saved->old_state = old_state;
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saved->out_string = out_string;
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memcpy (saved->out_buf, out_buf, sizeof (out_buf));
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saved->add_newlines = add_newlines;
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saved->scrub_string = scrub_string;
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saved->scrub_last_string = scrub_last_string;
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saved->scrub_file = scrub_file;
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/* do_scrub_begin() is not useful, just wastes time. */
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return (char *) saved;
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}
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void
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app_pop (arg)
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char *arg;
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{
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register struct app_save *saved = (struct app_save *) arg;
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/* There is no do_scrub_end (). */
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state = saved->state;
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old_state = saved->old_state;
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out_string = saved->out_string;
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memcpy (out_buf, saved->out_buf, sizeof (out_buf));
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add_newlines = saved->add_newlines;
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scrub_string = saved->scrub_string;
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scrub_last_string = saved->scrub_last_string;
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scrub_file = saved->scrub_file;
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free (arg);
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} /* app_pop() */
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/* @@ This assumes that \n &c are the same on host and target. This is not
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necessarily true. */
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int
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process_escape (ch)
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char ch;
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{
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switch (ch)
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{
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case 'b':
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return '\b';
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case 'f':
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return '\f';
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case 'n':
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return '\n';
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case 'r':
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return '\r';
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case 't':
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return '\t';
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case '\'':
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return '\'';
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case '"':
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return '\"';
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default:
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return ch;
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}
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}
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int
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do_scrub_next_char (get, unget)
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int (*get) ();
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void (*unget) ();
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{
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/*State 0: beginning of normal line
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1: After first whitespace on line (flush more white)
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2: After first non-white (opcode) on line (keep 1white)
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3: after second white on line (into operands) (flush white)
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4: after putting out a .line, put out digits
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5: parsing a string, then go to old-state
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6: putting out \ escape in a "d string.
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7: After putting out a .appfile, put out string.
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8: After putting out a .appfile string, flush until newline.
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9: After seeing symbol char in state 3 (keep 1white after symchar)
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10: After seeing whitespace in state 9 (keep white before symchar)
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-1: output string in out_string and go to the state in old_state
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-2: flush text until a '*' '/' is seen, then go to state old_state
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*/
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/* I added states 9 and 10 because the MIPS ECOFF assembler uses
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constructs like ``.loc 1 20''. This was turning into ``.loc
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120''. States 9 and 10 ensure that a space is never dropped in
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between characters which could appear in a identifier. Ian
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Taylor, ian@cygnus.com. */
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register int ch, ch2 = 0;
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switch (state)
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{
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case -1:
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ch = *out_string++;
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if (*out_string == 0)
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{
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state = old_state;
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old_state = 3;
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}
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return ch;
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case -2:
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for (;;)
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{
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do
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{
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ch = (*get) ();
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}
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while (ch != EOF && ch != '\n' && ch != '*');
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if (ch == '\n' || ch == EOF)
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return ch;
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/* At this point, ch must be a '*' */
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while ((ch = (*get) ()) == '*')
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{
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;
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}
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if (ch == EOF || ch == '/')
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break;
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(*unget) (ch);
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}
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state = old_state;
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return ' ';
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case 4:
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ch = (*get) ();
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if (ch == EOF || (ch >= '0' && ch <= '9'))
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return ch;
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else
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{
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while (ch != EOF && IS_WHITESPACE (ch))
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ch = (*get) ();
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if (ch == '"')
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{
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(*unget) (ch);
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out_string = "\n.appfile ";
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old_state = 7;
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state = -1;
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return *out_string++;
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}
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else
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{
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while (ch != EOF && ch != '\n')
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ch = (*get) ();
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state = 0;
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return ch;
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}
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}
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case 5:
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ch = (*get) ();
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if (lex[ch] == LEX_IS_STRINGQUOTE)
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{
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state = old_state;
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return ch;
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}
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else if (ch == '\\')
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{
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state = 6;
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return ch;
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}
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else if (ch == EOF)
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{
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as_warn ("End of file in string: inserted '\"'");
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state = old_state;
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(*unget) ('\n');
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return '"';
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}
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else
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{
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return ch;
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}
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case 6:
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state = 5;
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ch = (*get) ();
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switch (ch)
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{
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/* Handle strings broken across lines, by turning '\n' into
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'\\' and 'n'. */
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case '\n':
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(*unget) ('n');
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add_newlines++;
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return '\\';
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case '"':
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case '\\':
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#ifdef TC_HPPA
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case 'x': /* '\\x' introduces escaped sequences on the PA */
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#endif
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case 'b':
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case 'f':
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case 'n':
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case 'r':
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case 't':
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#ifdef BACKSLASH_V
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case 'v':
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#endif /* BACKSLASH_V */
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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break;
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#if defined(IGNORE_NONSTANDARD_ESCAPES) | defined(ONLY_STANDARD_ESCAPES)
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default:
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as_warn ("Unknown escape '\\%c' in string: Ignored", ch);
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break;
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#else /* ONLY_STANDARD_ESCAPES */
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default:
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/* Accept \x as x for any x */
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break;
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#endif /* ONLY_STANDARD_ESCAPES */
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case EOF:
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as_warn ("End of file in string: '\"' inserted");
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return '"';
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}
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return ch;
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case 7:
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ch = (*get) ();
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state = 5;
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old_state = 8;
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return ch;
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case 8:
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do
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ch = (*get) ();
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while (ch != '\n');
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state = 0;
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return ch;
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}
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/* OK, we are somewhere in states 0 through 4 or 9 through 10 */
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/* flushchar: */
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ch = (*get) ();
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recycle:
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if (ch == EOF)
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{
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if (state != 0)
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as_warn ("End of file not at end of a line: Newline inserted.");
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return ch;
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}
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switch (lex[ch])
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{
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case LEX_IS_WHITESPACE:
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do
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ch = (*get) ();
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while (ch != EOF && IS_WHITESPACE (ch));
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if (ch == EOF)
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return ch;
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if (IS_COMMENT (ch) || (state == 0 && IS_LINE_COMMENT (ch)) || ch == '/' || IS_LINE_SEPARATOR (ch))
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{
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goto recycle;
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}
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#ifdef MRI
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(*unget) (ch); /* Put back */
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return ' '; /* Always return one space at start of line */
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#endif
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/* If we're in state 2, we've seen a non-white
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character followed by whitespace. If the next
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character is ':', this is whitespace after a label
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name which we can ignore. */
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if (state == 2 && lex[ch] == LEX_IS_COLON)
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{
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state = 0;
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return ch;
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}
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switch (state)
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{
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case 0:
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state++;
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goto recycle; /* Punted leading sp */
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case 1:
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BAD_CASE (state); /* We can't get here */
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case 2:
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state = 3;
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(*unget) (ch);
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return ' '; /* Sp after opco */
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case 3:
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goto recycle; /* Sp in operands */
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case 9:
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case 10:
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state = 10; /* Sp after symbol char */
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goto recycle;
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default:
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BAD_CASE (state);
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}
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break;
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case LEX_IS_TWOCHAR_COMMENT_1ST:
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ch2 = (*get) ();
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if (ch2 != EOF && lex[ch2] == LEX_IS_TWOCHAR_COMMENT_2ND)
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{
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for (;;)
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{
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do
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{
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ch2 = (*get) ();
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if (ch2 != EOF && IS_NEWLINE (ch2))
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add_newlines++;
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}
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while (ch2 != EOF &&
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(lex[ch2] != LEX_IS_TWOCHAR_COMMENT_2ND));
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while (ch2 != EOF &&
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(lex[ch2] == LEX_IS_TWOCHAR_COMMENT_2ND))
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{
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ch2 = (*get) ();
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}
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if (ch2 == EOF
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|| lex[ch2] == LEX_IS_TWOCHAR_COMMENT_1ST)
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break;
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(*unget) (ch);
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}
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if (ch2 == EOF)
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as_warn ("End of file in multiline comment");
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ch = ' ';
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goto recycle;
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}
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else
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{
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if (ch2 != EOF)
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(*unget) (ch2);
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if (state == 9 || state == 10)
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state = 3;
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return ch;
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}
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break;
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case LEX_IS_STRINGQUOTE:
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if (state == 9 || state == 10)
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old_state = 3;
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else
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old_state = state;
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state = 5;
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return ch;
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#ifndef MRI
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#ifndef IEEE_STYLE
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case LEX_IS_ONECHAR_QUOTE:
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ch = (*get) ();
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if (ch == EOF)
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{
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as_warn ("End-of-file after a one-character quote; \\000 inserted");
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ch = 0;
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}
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if (ch == '\\')
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{
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ch = (*get) ();
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ch = process_escape (ch);
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}
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sprintf (out_buf, "%d", (int) (unsigned char) ch);
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/* None of these 'x constants for us. We want 'x'. */
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if ((ch = (*get) ()) != '\'')
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{
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#ifdef REQUIRE_CHAR_CLOSE_QUOTE
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as_warn ("Missing close quote: (assumed)");
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#else
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(*unget) (ch);
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#endif
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}
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if (strlen (out_buf) == 1)
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{
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return out_buf[0];
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}
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if (state == 9 || state == 10)
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old_state = 3;
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else
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old_state = state;
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state = -1;
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out_string = out_buf;
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return *out_string++;
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#endif
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#endif
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case LEX_IS_COLON:
|
|
if (state == 9 || state == 10)
|
|
state = 3;
|
|
else if (state != 3)
|
|
state = 0;
|
|
return ch;
|
|
|
|
case LEX_IS_NEWLINE:
|
|
/* Roll out a bunch of newlines from inside comments, etc. */
|
|
if (add_newlines)
|
|
{
|
|
--add_newlines;
|
|
(*unget) (ch);
|
|
}
|
|
/* fall thru into... */
|
|
|
|
case LEX_IS_LINE_SEPARATOR:
|
|
state = 0;
|
|
return ch;
|
|
|
|
case LEX_IS_LINE_COMMENT_START:
|
|
if (state == 0) /* Only comment at start of line. */
|
|
{
|
|
/* FIXME-someday: The two character comment stuff was badly
|
|
thought out. On i386, we want '/' as line comment start
|
|
AND we want C style comments. hence this hack. The
|
|
whole lexical process should be reworked. xoxorich. */
|
|
if (ch == '/')
|
|
{
|
|
ch2 = (*get) ();
|
|
if (ch2 == '*')
|
|
{
|
|
state = -2;
|
|
return (do_scrub_next_char (get, unget));
|
|
}
|
|
else
|
|
{
|
|
(*unget) (ch2);
|
|
}
|
|
} /* bad hack */
|
|
|
|
do
|
|
ch = (*get) ();
|
|
while (ch != EOF && IS_WHITESPACE (ch));
|
|
if (ch == EOF)
|
|
{
|
|
as_warn ("EOF in comment: Newline inserted");
|
|
return '\n';
|
|
}
|
|
if (ch < '0' || ch > '9')
|
|
{
|
|
/* Non-numerics: Eat whole comment line */
|
|
while (ch != EOF && !IS_NEWLINE (ch))
|
|
ch = (*get) ();
|
|
if (ch == EOF)
|
|
as_warn ("EOF in Comment: Newline inserted");
|
|
state = 0;
|
|
return '\n';
|
|
}
|
|
/* Numerics begin comment. Perhaps CPP `# 123 "filename"' */
|
|
(*unget) (ch);
|
|
old_state = 4;
|
|
state = -1;
|
|
out_string = ".appline ";
|
|
return *out_string++;
|
|
}
|
|
|
|
/* We have a line comment character which is not at the start of
|
|
a line. If this is also a normal comment character, fall
|
|
through. Otherwise treat it as a default character. */
|
|
if (strchr (comment_chars, ch) == NULL)
|
|
goto de_fault;
|
|
/* Fall through. */
|
|
case LEX_IS_COMMENT_START:
|
|
do
|
|
ch = (*get) ();
|
|
while (ch != EOF && !IS_NEWLINE (ch));
|
|
if (ch == EOF)
|
|
as_warn ("EOF in comment: Newline inserted");
|
|
state = 0;
|
|
return '\n';
|
|
|
|
case LEX_IS_SYMBOL_COMPONENT:
|
|
if (state == 10)
|
|
{
|
|
/* This is a symbol character following another symbol
|
|
character, with whitespace in between. We skipped the
|
|
whitespace earlier, so output it now. */
|
|
(*unget) (ch);
|
|
state = 3;
|
|
return ' ';
|
|
}
|
|
if (state == 3)
|
|
state = 9;
|
|
/* Fall through. */
|
|
default:
|
|
de_fault:
|
|
/* Some relatively `normal' character. */
|
|
if (state == 0)
|
|
{
|
|
state = 2; /* Now seeing opcode */
|
|
return ch;
|
|
}
|
|
else if (state == 1)
|
|
{
|
|
state = 2; /* Ditto */
|
|
return ch;
|
|
}
|
|
else if (state == 9)
|
|
{
|
|
if (lex[ch] != LEX_IS_SYMBOL_COMPONENT)
|
|
state = 3;
|
|
return ch;
|
|
}
|
|
else if (state == 10)
|
|
{
|
|
state = 3;
|
|
return ch;
|
|
}
|
|
else
|
|
{
|
|
return ch; /* Opcode or operands already */
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
#ifdef TEST
|
|
|
|
const char comment_chars[] = "|";
|
|
const char line_comment_chars[] = "#";
|
|
|
|
main ()
|
|
{
|
|
int ch;
|
|
|
|
app_begin ();
|
|
while ((ch = do_scrub_next_char (stdin)) != EOF)
|
|
putc (ch, stdout);
|
|
}
|
|
|
|
as_warn (str)
|
|
char *str;
|
|
{
|
|
fputs (str, stderr);
|
|
putc ('\n', stderr);
|
|
}
|
|
|
|
#endif
|
|
|
|
/* end of app.c */
|