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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /gas/input-scrub.c
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19990502 sourceware importbinu_ss_19990502
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diff --git a/gas/input-scrub.c b/gas/input-scrub.c
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+/* input_scrub.c - Break up input buffers into whole numbers of lines.
+ Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 96, 1997
+ Free Software Foundation, Inc.
+
+ This file is part of GAS, the GNU Assembler.
+
+ GAS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ GAS is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GAS; see the file COPYING. If not, write to the Free
+ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+#include <errno.h> /* Need this to make errno declaration right */
+#include "as.h"
+#include "input-file.h"
+#include "sb.h"
+#include "listing.h"
+
+/*
+ * O/S independent module to supply buffers of sanitised source code
+ * to rest of assembler. We get sanitised input data of arbitrary length.
+ * We break these buffers on line boundaries, recombine pieces that
+ * were broken across buffers, and return a buffer of full lines to
+ * the caller.
+ * The last partial line begins the next buffer we build and return to caller.
+ * The buffer returned to caller is preceeded by BEFORE_STRING and followed
+ * by AFTER_STRING, as sentinels. The last character before AFTER_STRING
+ * is a newline.
+ * Also looks after line numbers, for e.g. error messages.
+ */
+
+/*
+ * We don't care how filthy our buffers are, but our callers assume
+ * that the following sanitation has already been done.
+ *
+ * No comments, reduce a comment to a space.
+ * Reduce a tab to a space unless it is 1st char of line.
+ * All multiple tabs and spaces collapsed into 1 char. Tab only
+ * legal if 1st char of line.
+ * # line file statements converted to .line x;.file y; statements.
+ * Escaped newlines at end of line: remove them but add as many newlines
+ * to end of statement as you removed in the middle, to synch line numbers.
+ */
+
+#define BEFORE_STRING ("\n")
+#define AFTER_STRING ("\0") /* memcpy of 0 chars might choke. */
+#define BEFORE_SIZE (1)
+#define AFTER_SIZE (1)
+
+static char *buffer_start; /*->1st char of full buffer area. */
+static char *partial_where; /*->after last full line in buffer. */
+static int partial_size; /* >=0. Number of chars in partial line in buffer. */
+static char save_source[AFTER_SIZE];
+/* Because we need AFTER_STRING just after last */
+/* full line, it clobbers 1st part of partial */
+/* line. So we preserve 1st part of partial */
+/* line here. */
+static unsigned int buffer_length; /* What is the largest size buffer that */
+/* input_file_give_next_buffer() could */
+/* return to us? */
+
+/* The index into an sb structure we are reading from. -1 if none. */
+static int sb_index = -1;
+
+/* If we are reading from an sb structure, this is it. */
+static sb from_sb;
+
+/* The number of nested sb structures we have included. */
+int macro_nest;
+
+/* We can have more than one source file open at once, though the info for all
+ but the latest one are saved off in a struct input_save. These files remain
+ open, so we are limited by the number of open files allowed by the
+ underlying OS. We may also sequentially read more than one source file in an
+ assembly. */
+
+/* We must track the physical file and line number for error messages. We also
+ track a "logical" file and line number corresponding to (C?) compiler
+ source line numbers. Whenever we open a file we must fill in
+ physical_input_file. So if it is NULL we have not opened any files yet. */
+
+static char *physical_input_file;
+static char *logical_input_file;
+
+typedef unsigned int line_numberT; /* 1-origin line number in a source file. */
+/* A line ends in '\n' or eof. */
+
+static line_numberT physical_input_line;
+static int logical_input_line;
+
+/* Struct used to save the state of the input handler during include files */
+struct input_save
+ {
+ char *buffer_start;
+ char *partial_where;
+ int partial_size;
+ char save_source[AFTER_SIZE];
+ unsigned int buffer_length;
+ char *physical_input_file;
+ char *logical_input_file;
+ line_numberT physical_input_line;
+ int logical_input_line;
+ int sb_index;
+ sb from_sb;
+ struct input_save *next_saved_file; /* Chain of input_saves */
+ char *input_file_save; /* Saved state of input routines */
+ char *saved_position; /* Caller's saved position in buf */
+ };
+
+static struct input_save *input_scrub_push PARAMS ((char *saved_position));
+static char *input_scrub_pop PARAMS ((struct input_save *arg));
+static void as_1_char PARAMS ((unsigned int c, FILE * stream));
+
+/* Saved information about the file that .include'd this one. When we hit EOF,
+ we automatically pop to that file. */
+
+static struct input_save *next_saved_file;
+
+/* Push the state of input reading and scrubbing so that we can #include.
+ The return value is a 'void *' (fudged for old compilers) to a save
+ area, which can be restored by passing it to input_scrub_pop(). */
+static struct input_save *
+input_scrub_push (saved_position)
+ char *saved_position;
+{
+ register struct input_save *saved;
+
+ saved = (struct input_save *) xmalloc (sizeof *saved);
+
+ saved->saved_position = saved_position;
+ saved->buffer_start = buffer_start;
+ saved->partial_where = partial_where;
+ saved->partial_size = partial_size;
+ saved->buffer_length = buffer_length;
+ saved->physical_input_file = physical_input_file;
+ saved->logical_input_file = logical_input_file;
+ saved->physical_input_line = physical_input_line;
+ saved->logical_input_line = logical_input_line;
+ saved->sb_index = sb_index;
+ saved->from_sb = from_sb;
+ memcpy (saved->save_source, save_source, sizeof (save_source));
+ saved->next_saved_file = next_saved_file;
+ saved->input_file_save = input_file_push ();
+
+ input_file_begin (); /* Reinitialize! */
+ logical_input_line = -1;
+ logical_input_file = (char *) NULL;
+ buffer_length = input_file_buffer_size ();
+ sb_index = -1;
+
+ buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
+ memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
+
+ return saved;
+} /* input_scrub_push() */
+
+static char *
+input_scrub_pop (saved)
+ struct input_save *saved;
+{
+ char *saved_position;
+
+ input_scrub_end (); /* Finish off old buffer */
+
+ input_file_pop (saved->input_file_save);
+ saved_position = saved->saved_position;
+ buffer_start = saved->buffer_start;
+ buffer_length = saved->buffer_length;
+ physical_input_file = saved->physical_input_file;
+ logical_input_file = saved->logical_input_file;
+ physical_input_line = saved->physical_input_line;
+ logical_input_line = saved->logical_input_line;
+ sb_index = saved->sb_index;
+ from_sb = saved->from_sb;
+ partial_where = saved->partial_where;
+ partial_size = saved->partial_size;
+ next_saved_file = saved->next_saved_file;
+ memcpy (save_source, saved->save_source, sizeof (save_source));
+
+ free (saved);
+ return saved_position;
+}
+
+
+void
+input_scrub_begin ()
+{
+ know (strlen (BEFORE_STRING) == BEFORE_SIZE);
+ know (strlen (AFTER_STRING) == AFTER_SIZE || (AFTER_STRING[0] == '\0' && AFTER_SIZE == 1));
+
+ input_file_begin ();
+
+ buffer_length = input_file_buffer_size ();
+
+ buffer_start = xmalloc ((BEFORE_SIZE + buffer_length + buffer_length + AFTER_SIZE));
+ memcpy (buffer_start, BEFORE_STRING, (int) BEFORE_SIZE);
+
+ /* Line number things. */
+ logical_input_line = -1;
+ logical_input_file = (char *) NULL;
+ physical_input_file = NULL; /* No file read yet. */
+ next_saved_file = NULL; /* At EOF, don't pop to any other file */
+ do_scrub_begin (flag_m68k_mri);
+}
+
+void
+input_scrub_end ()
+{
+ if (buffer_start)
+ {
+ free (buffer_start);
+ buffer_start = 0;
+ input_file_end ();
+ }
+}
+
+/* Start reading input from a new file. */
+
+char * /* Return start of caller's part of buffer. */
+input_scrub_new_file (filename)
+ char *filename;
+{
+ input_file_open (filename, !flag_no_comments);
+ physical_input_file = filename[0] ? filename : _("{standard input}");
+ physical_input_line = 0;
+
+ partial_size = 0;
+ return (buffer_start + BEFORE_SIZE);
+}
+
+
+/* Include a file from the current file. Save our state, cause it to
+ be restored on EOF, and begin handling a new file. Same result as
+ input_scrub_new_file. */
+
+char *
+input_scrub_include_file (filename, position)
+ char *filename;
+ char *position;
+{
+ next_saved_file = input_scrub_push (position);
+ return input_scrub_new_file (filename);
+}
+
+/* Start getting input from an sb structure. This is used when
+ expanding a macro. */
+
+void
+input_scrub_include_sb (from, position)
+ sb *from;
+ char *position;
+{
+ if (macro_nest > max_macro_nest)
+ as_fatal (_("macros nested too deeply"));
+ ++macro_nest;
+
+ next_saved_file = input_scrub_push (position);
+
+ sb_new (&from_sb);
+ if (from->len >= 1 && from->ptr[0] != '\n')
+ {
+ /* Add the sentinel required by read.c. */
+ sb_add_char (&from_sb, '\n');
+ }
+ sb_add_sb (&from_sb, from);
+ sb_index = 1;
+
+ /* These variables are reset by input_scrub_push. Restore them
+ since we are, after all, still at the same point in the file. */
+ logical_input_line = next_saved_file->logical_input_line;
+ logical_input_file = next_saved_file->logical_input_file;
+}
+
+void
+input_scrub_close ()
+{
+ input_file_close ();
+}
+
+char *
+input_scrub_next_buffer (bufp)
+ char **bufp;
+{
+ register char *limit; /*->just after last char of buffer. */
+
+ if (sb_index >= 0)
+ {
+ if (sb_index >= from_sb.len)
+ {
+ sb_kill (&from_sb);
+ cond_finish_check (macro_nest);
+ --macro_nest;
+ partial_where = NULL;
+ if (next_saved_file != NULL)
+ *bufp = input_scrub_pop (next_saved_file);
+ return partial_where;
+ }
+
+ partial_where = from_sb.ptr + from_sb.len;
+ partial_size = 0;
+ *bufp = from_sb.ptr + sb_index;
+ sb_index = from_sb.len;
+ return partial_where;
+ }
+
+ *bufp = buffer_start + BEFORE_SIZE;
+
+ if (partial_size)
+ {
+ memcpy (buffer_start + BEFORE_SIZE, partial_where,
+ (unsigned int) partial_size);
+ memcpy (buffer_start + BEFORE_SIZE, save_source, AFTER_SIZE);
+ }
+ limit = input_file_give_next_buffer (buffer_start
+ + BEFORE_SIZE
+ + partial_size);
+ if (limit)
+ {
+ register char *p; /* Find last newline. */
+
+ for (p = limit - 1; *p != '\n'; --p)
+ ;
+ ++p;
+
+ while (p <= buffer_start + BEFORE_SIZE)
+ {
+ int limoff;
+
+ limoff = limit - buffer_start;
+ buffer_length += input_file_buffer_size ();
+ buffer_start = xrealloc (buffer_start,
+ (BEFORE_SIZE
+ + 2 * buffer_length
+ + AFTER_SIZE));
+ *bufp = buffer_start + BEFORE_SIZE;
+ limit = input_file_give_next_buffer (buffer_start + limoff);
+
+ if (limit == NULL)
+ {
+ as_warn (_("partial line at end of file ignored"));
+ partial_where = NULL;
+ if (next_saved_file)
+ *bufp = input_scrub_pop (next_saved_file);
+ return NULL;
+ }
+
+ for (p = limit - 1; *p != '\n'; --p)
+ ;
+ ++p;
+ }
+
+ partial_where = p;
+ partial_size = limit - p;
+ memcpy (save_source, partial_where, (int) AFTER_SIZE);
+ memcpy (partial_where, AFTER_STRING, (int) AFTER_SIZE);
+ }
+ else
+ {
+ partial_where = 0;
+ if (partial_size > 0)
+ {
+ as_warn (_("Partial line at end of file ignored"));
+ }
+
+ /* Tell the listing we've finished the file. */
+ LISTING_EOF ();
+
+ /* If we should pop to another file at EOF, do it. */
+ if (next_saved_file)
+ {
+ *bufp = input_scrub_pop (next_saved_file); /* Pop state */
+ /* partial_where is now correct to return, since we popped it. */
+ }
+ }
+ return (partial_where);
+} /* input_scrub_next_buffer() */
+
+/*
+ * The remaining part of this file deals with line numbers, error
+ * messages and so on.
+ */
+
+
+int
+seen_at_least_1_file () /* TRUE if we opened any file. */
+{
+ return (physical_input_file != NULL);
+}
+
+void
+bump_line_counters ()
+{
+ if (sb_index < 0)
+ {
+ ++physical_input_line;
+ if (logical_input_line >= 0)
+ ++logical_input_line;
+ }
+}
+
+/*
+ * new_logical_line()
+ *
+ * Tells us what the new logical line number and file are.
+ * If the line_number is -1, we don't change the current logical line
+ * number. If it is -2, we decrement the logical line number (this is
+ * to support the .appfile pseudo-op inserted into the stream by
+ * do_scrub_chars).
+ * If the fname is NULL, we don't change the current logical file name.
+ * Returns nonzero if the filename actually changes.
+ */
+int
+new_logical_line (fname, line_number)
+ char *fname; /* DON'T destroy it! We point to it! */
+ int line_number;
+{
+ if (line_number >= 0)
+ logical_input_line = line_number;
+ else if (line_number == -2 && logical_input_line > 0)
+ --logical_input_line;
+
+ if (fname
+ && (logical_input_file == NULL
+ || strcmp (logical_input_file, fname)))
+ {
+ logical_input_file = fname;
+ return 1;
+ }
+ else
+ return 0;
+} /* new_logical_line() */
+
+/*
+ * a s _ w h e r e ()
+ *
+ * Return the current file name and line number.
+ * namep should be char * const *, but there are compilers which screw
+ * up declarations like that, and it's easier to avoid it.
+ */
+void
+as_where (namep, linep)
+ char **namep;
+ unsigned int *linep;
+{
+ if (logical_input_file != NULL
+ && (linep == NULL || logical_input_line >= 0))
+ {
+ *namep = logical_input_file;
+ if (linep != NULL)
+ *linep = logical_input_line;
+ }
+ else if (physical_input_file != NULL)
+ {
+ *namep = physical_input_file;
+ if (linep != NULL)
+ *linep = physical_input_line;
+ }
+ else
+ {
+ *namep = 0;
+ if (linep != NULL)
+ *linep = 0;
+ }
+} /* as_where() */
+
+
+
+
+/*
+ * a s _ h o w m u c h ()
+ *
+ * Output to given stream how much of line we have scanned so far.
+ * Assumes we have scanned up to and including input_line_pointer.
+ * No free '\n' at end of line.
+ */
+void
+as_howmuch (stream)
+ FILE *stream; /* Opened for write please. */
+{
+ register char *p; /* Scan input line. */
+ /* register char c; JF unused */
+
+ for (p = input_line_pointer - 1; *p != '\n'; --p)
+ {
+ }
+ ++p; /* p->1st char of line. */
+ for (; p <= input_line_pointer; p++)
+ {
+ /* Assume ASCII. EBCDIC & other micro-computer char sets ignored. */
+ as_1_char ((unsigned char) *p, stream);
+ }
+}
+
+static void
+as_1_char (c, stream)
+ unsigned int c;
+ FILE *stream;
+{
+ if (c > 127)
+ {
+ (void) putc ('%', stream);
+ c -= 128;
+ }
+ if (c < 32)
+ {
+ (void) putc ('^', stream);
+ c += '@';
+ }
+ (void) putc (c, stream);
+}
+
+/* end of input_scrub.c */