479 lines
14 KiB
C
479 lines
14 KiB
C
/* input_scrub.c - Break up input buffers into whole numbers of lines.
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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <errno.h> /* Need this to make errno declaration right */
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#include "as.h"
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#include "input-file.h"
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#include "sb.h"
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/*
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* O/S independent module to supply buffers of sanitised source code
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* to rest of assembler. We get sanitised input data of arbitrary length.
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* We break these buffers on line boundaries, recombine pieces that
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* were broken across buffers, and return a buffer of full lines to
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* the caller.
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* The last partial line begins the next buffer we build and return to caller.
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* The buffer returned to caller is preceeded by BEFORE_STRING and followed
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* by AFTER_STRING, as sentinels. The last character before AFTER_STRING
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* is a newline.
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* Also looks after line numbers, for e.g. error messages.
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*/
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/*
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* We don't care how filthy our buffers are, but our callers assume
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* that the following sanitation has already been done.
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*
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* No comments, reduce a comment to a space.
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* Reduce a tab to a space unless it is 1st char of line.
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* All multiple tabs and spaces collapsed into 1 char. Tab only
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* legal if 1st char of line.
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* # line file statements converted to .line x;.file y; statements.
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* Escaped newlines at end of line: remove them but add as many newlines
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* to end of statement as you removed in the middle, to synch line numbers.
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*/
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#define BEFORE_STRING ("\n")
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#define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */
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#define BEFORE_SIZE (1)
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#define AFTER_SIZE (1)
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static char *buffer_start; /*->1st char of full buffer area. */
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static char *partial_where; /*->after last full line in buffer. */
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static int partial_size; /* >=0. Number of chars in partial line in buffer. */
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static char save_source[AFTER_SIZE];
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/* Because we need AFTER_STRING just after last */
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/* full line, it clobbers 1st part of partial */
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/* line. So we preserve 1st part of partial */
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/* line here. */
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static unsigned int buffer_length; /* What is the largest size buffer that */
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/* input_file_give_next_buffer() could */
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/* return to us? */
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/* The index into an sb structure we are reading from. -1 if none. */
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static int sb_index = -1;
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/* If we are reading from an sb structure, this is it. */
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static sb from_sb;
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/* The number of nested sb structures we have included. */
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static int macro_nest;
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/* We can have more than one source file open at once, though the info for all
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but the latest one are saved off in a struct input_save. These files remain
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open, so we are limited by the number of open files allowed by the
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underlying OS. We may also sequentially read more than one source file in an
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assembly. */
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/* We must track the physical file and line number for error messages. We also
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track a "logical" file and line number corresponding to (C?) compiler
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source line numbers. Whenever we open a file we must fill in
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physical_input_file. So if it is NULL we have not opened any files yet. */
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static char *physical_input_file;
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static char *logical_input_file;
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typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
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/* A line ends in '\n' or eof. */
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static line_numberT physical_input_line;
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static int logical_input_line;
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/* Struct used to save the state of the input handler during include files */
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struct input_save
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{
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char *buffer_start;
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char *partial_where;
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int partial_size;
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char save_source[AFTER_SIZE];
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unsigned int buffer_length;
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char *physical_input_file;
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char *logical_input_file;
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line_numberT physical_input_line;
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int logical_input_line;
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int sb_index;
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sb from_sb;
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struct input_save *next_saved_file; /* Chain of input_saves */
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char *input_file_save; /* Saved state of input routines */
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char *saved_position; /* Caller's saved position in buf */
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};
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static struct input_save *input_scrub_push PARAMS ((char *saved_position));
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static char *input_scrub_pop PARAMS ((struct input_save *arg));
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static void as_1_char PARAMS ((unsigned int c, FILE * stream));
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/* Saved information about the file that .include'd this one. When we hit EOF,
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we automatically pop to that file. */
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static struct input_save *next_saved_file;
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/* Push the state of input reading and scrubbing so that we can #include.
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The return value is a 'void *' (fudged for old compilers) to a save
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area, which can be restored by passing it to input_scrub_pop(). */
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static struct input_save *
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input_scrub_push (saved_position)
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char *saved_position;
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{
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register struct input_save *saved;
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saved = (struct input_save *) xmalloc (sizeof *saved);
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saved->saved_position = saved_position;
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saved->buffer_start = buffer_start;
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saved->partial_where = partial_where;
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saved->partial_size = partial_size;
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saved->buffer_length = buffer_length;
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saved->physical_input_file = physical_input_file;
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saved->logical_input_file = logical_input_file;
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saved->physical_input_line = physical_input_line;
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saved->logical_input_line = logical_input_line;
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saved->sb_index = sb_index;
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saved->from_sb = from_sb;
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memcpy (saved->save_source, save_source, sizeof (save_source));
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saved->next_saved_file = next_saved_file;
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saved->input_file_save = input_file_push ();
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input_file_begin (); /* Reinitialize! */
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logical_input_line = -1;
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logical_input_file = (char *) NULL;
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buffer_length = input_file_buffer_size ();
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buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
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memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
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return saved;
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} /* input_scrub_push() */
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static char *
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input_scrub_pop (saved)
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struct input_save *saved;
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{
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char *saved_position;
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input_scrub_end (); /* Finish off old buffer */
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input_file_pop (saved->input_file_save);
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saved_position = saved->saved_position;
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buffer_start = saved->buffer_start;
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buffer_length = saved->buffer_length;
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physical_input_file = saved->physical_input_file;
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logical_input_file = saved->logical_input_file;
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physical_input_line = saved->physical_input_line;
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logical_input_line = saved->logical_input_line;
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sb_index = saved->sb_index;
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from_sb = saved->from_sb;
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partial_where = saved->partial_where;
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partial_size = saved->partial_size;
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next_saved_file = saved->next_saved_file;
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memcpy (save_source, saved->save_source, sizeof (save_source));
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free (saved);
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return saved_position;
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}
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void
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input_scrub_begin ()
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{
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know (strlen (BEFORE_STRING) == BEFORE_SIZE);
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know (strlen (AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
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input_file_begin ();
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buffer_length = input_file_buffer_size ();
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buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
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memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
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/* Line number things. */
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logical_input_line = -1;
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logical_input_file = (char *) NULL;
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physical_input_file = NULL; /* No file read yet. */
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next_saved_file = NULL; /* At EOF, don't pop to any other file */
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do_scrub_begin ();
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}
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void
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input_scrub_end ()
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{
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if (buffer_start)
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{
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free (buffer_start);
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buffer_start = 0;
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input_file_end ();
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}
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}
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/* Start reading input from a new file. */
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char * /* Return start of caller's part of buffer. */
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input_scrub_new_file (filename)
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char *filename;
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{
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input_file_open (filename, !flag_no_comments);
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physical_input_file = filename[0] ? filename : "{standard input}";
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physical_input_line = 0;
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partial_size = 0;
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return (buffer_start + BEFORE_SIZE);
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}
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/* Include a file from the current file. Save our state, cause it to
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be restored on EOF, and begin handling a new file. Same result as
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input_scrub_new_file. */
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char *
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input_scrub_include_file (filename, position)
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char *filename;
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char *position;
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{
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next_saved_file = input_scrub_push (position);
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return input_scrub_new_file (filename);
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}
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/* Start getting input from an sb structure. This is used when
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expanding a macro. */
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void
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input_scrub_include_sb (from, position)
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sb *from;
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char *position;
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{
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if (macro_nest > max_macro_nest)
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as_fatal ("macros nested too deeply");
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++macro_nest;
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next_saved_file = input_scrub_push (position);
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sb_new (&from_sb);
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/* Add the sentinel required by read.c. */
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sb_add_char (&from_sb, '\n');
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sb_add_sb (&from_sb, from);
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sb_index = 1;
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/* These variables are reset by input_scrub_push. Restore them
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since we are, after all, still at the same point in the file. */
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logical_input_line = next_saved_file->logical_input_line;
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logical_input_file = next_saved_file->logical_input_file;
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}
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void
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input_scrub_close ()
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{
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input_file_close ();
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}
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char *
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input_scrub_next_buffer (bufp)
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char **bufp;
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{
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register char *limit; /*->just after last char of buffer. */
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if (sb_index >= 0)
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{
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if (sb_index >= from_sb.len)
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{
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sb_kill (&from_sb);
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--macro_nest;
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partial_where = NULL;
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if (next_saved_file != NULL)
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*bufp = input_scrub_pop (next_saved_file);
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return partial_where;
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}
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partial_where = from_sb.ptr + from_sb.len;
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partial_size = 0;
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*bufp = from_sb.ptr + sb_index;
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sb_index = from_sb.len;
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return partial_where;
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}
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*bufp = buffer_start + BEFORE_SIZE;
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if (partial_size)
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{
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memcpy (buffer_start + BEFORE_SIZE, partial_where,
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(unsigned int) partial_size);
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memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE);
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}
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limit = input_file_give_next_buffer (buffer_start
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+ BEFORE_SIZE
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+ partial_size);
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if (limit)
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{
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register char *p; /* Find last newline. */
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for (p = limit; *--p != '\n';);;
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++p;
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if (p <= buffer_start + BEFORE_SIZE)
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{
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as_fatal ("Source line too long. Please change file %s then rebuild assembler.", __FILE__);
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}
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partial_where = p;
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partial_size = limit - p;
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memcpy (save_source, partial_where, (int) AFTER_SIZE);
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memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE);
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}
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else
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{
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partial_where = 0;
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if (partial_size > 0)
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{
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as_warn ("Partial line at end of file ignored");
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}
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/* If we should pop to another file at EOF, do it. */
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if (next_saved_file)
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{
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*bufp = input_scrub_pop (next_saved_file); /* Pop state */
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/* partial_where is now correct to return, since we popped it. */
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}
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}
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return (partial_where);
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} /* input_scrub_next_buffer() */
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/*
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* The remaining part of this file deals with line numbers, error
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* messages and so on.
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*/
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int
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seen_at_least_1_file () /* TRUE if we opened any file. */
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{
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return (physical_input_file != NULL);
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}
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void
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bump_line_counters ()
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{
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if (sb_index < 0)
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{
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++physical_input_line;
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if (logical_input_line >= 0)
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++logical_input_line;
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}
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}
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/*
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* new_logical_line()
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*
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* Tells us what the new logical line number and file are.
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* If the line_number is -1, we don't change the current logical line
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* number. If it is -2, we decrement the logical line number (this is
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* to support the .appfile pseudo-op inserted into the stream by
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* do_scrub_chars).
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* If the fname is NULL, we don't change the current logical file name.
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*/
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void
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new_logical_line (fname, line_number)
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char *fname; /* DON'T destroy it! We point to it! */
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int line_number;
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{
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if (fname)
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{
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logical_input_file = fname;
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} /* if we have a file name */
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if (line_number >= 0)
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logical_input_line = line_number;
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else if (line_number == -2 && logical_input_line > 0)
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--logical_input_line;
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} /* new_logical_line() */
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/*
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* a s _ w h e r e ()
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*
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* Return the current file name and line number.
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* namep should be char * const *, but there are compilers which screw
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* up declarations like that, and it's easier to avoid it.
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*/
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void
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as_where (namep, linep)
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char **namep;
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unsigned int *linep;
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{
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if (logical_input_file != NULL
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&& (linep == NULL || logical_input_line >= 0))
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{
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*namep = logical_input_file;
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if (linep != NULL)
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*linep = logical_input_line;
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}
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else if (physical_input_file != NULL)
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{
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*namep = physical_input_file;
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if (linep != NULL)
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*linep = physical_input_line;
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}
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else
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{
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*namep = 0;
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if (linep != NULL)
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*linep = 0;
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}
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} /* as_where() */
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/*
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* a s _ h o w m u c h ()
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*
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* Output to given stream how much of line we have scanned so far.
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* Assumes we have scanned up to and including input_line_pointer.
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* No free '\n' at end of line.
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*/
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void
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as_howmuch (stream)
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FILE *stream; /* Opened for write please. */
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{
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register char *p; /* Scan input line. */
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/* register char c; JF unused */
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for (p = input_line_pointer - 1; *p != '\n'; --p)
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{
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}
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++p; /* p->1st char of line. */
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for (; p <= input_line_pointer; p++)
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{
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/* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
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as_1_char ((unsigned char) *p, stream);
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}
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}
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static void
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as_1_char (c, stream)
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unsigned int c;
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FILE *stream;
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{
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if (c > 127)
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{
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(void) putc ('%', stream);
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c -= 128;
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}
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if (c < 32)
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{
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(void) putc ('^', stream);
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c += '@';
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}
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(void) putc (c, stream);
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}
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/* end of input_scrub.c */
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