/* Begin include file alm_xref_nodes.incl.pl1.
   This file defines the structures of the two nodes which make up the symbol tree
   maintained by ALM (table_) for use in generating the cross-reference.
   First written on 07/23/72 at 14:54:03 by R F Mabee.
   Last modified on 07/27/72 at 08:48:06 by R F Mabee. */

 declare	1 symbol_tree_node based aligned,		/* Binary name tree, sorted alphabetically. */
	  2 high_sublist fixed binary,		/* Relative pointer to symbol_tree_node.name_rel. */
	  2 low_sublist fixed binary,
	  2 line_list_forward_rel bit (18) unaligned,	/* Thread of line number nodes. */
	  2 line_list_backward_rel bit (18) unaligned,	/* They are doubly threaded. */
	/* Above prefix must occupy three words, as pointers all point at next item. */
	  2 name_rel bit (18) unaligned,		/* Relative pointer to ACC symbol name. */
	  2 next_rel bit (18) unaligned,		/* Hash bucket thread. */
	  2 flags bit (18) unaligned,		/* Used by table_. */
	  2 value bit (18) unaligned,		/* Value associated with symbol. */
	  2 location_counter bit (18) unaligned, /* Relative pointer to l.c. bead. */
	  2 filler bit (18) unaligned,	/* Probably used, not needed for xref. */
	  2 origin bit (18) unaligned,	/* Origin for a location counter node. */
	  2 padding bit (18) unaligned;	/* So PL/I does right thing with above. */
	/* The format of the rest of the node depends on what kind of symbol it is,
	    which is why the line list is put before the visible part of the node. */

 declare	1 line_node based aligned,			/* Sorted list of referencing line numbers. */
	  2 forward_rel bit (18) unaligned,		/* Thread of line_nodes. */
	  2 backward_rel bit (18) unaligned,		/* Doubly threaded. */
	  2 line_no fixed binary;			/* Combined line number and relative address of file name node. */

/* End of include file alm_xref_nodes.incl.pl1. */


*/
                                          -----------------------------------------------------------


Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group Bull including Bull HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell Bull Inc., Groupe Bull
and Bull HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for 
managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

                                          -----------------------------------------------------------

Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, Bull or Bull HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by Bull HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved

*/