19990502 sourceware importbinu_ss_19990502

1 files changed, 521 insertions, 0 deletions

diff --git a/gas/input-scrub.c b/gas/input-scrub.c
new file mode 100644
index 0000000..46a3bb3
--- /dev/null
+++ b/gas/input-scrub.c
@@ -0,0 +1,521 @@
+/* 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 */