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/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/*** rstack.c --- Renaming stack ADT.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 *** Commentary:

 *

 * This file implements the renaming stack routines.  They are mainly used by

 * the output routines to do scoping of inlined rules.

 *

 *** Change Log:

 * $Log: rstack.c,v $

 * Revision 1.1.1.1  1998/01/17  15:57:46  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/15  09:58:31  smf

 * Brought into line with OSSG C Coding Standards Document, as per

 * "CR94_178.sid+tld-update".

 *

 * Revision 1.1.1.1  1994/07/25  16:04:37  smf

 * Initial import of SID 1.8 non shared files.

 *

**/

/****************************************************************************/

#include "rstack.h"

#include "action.h"

#include "basic.h"

#include "name.h"

#include "rule.h"

#include "type.h"

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

void

rstack_init PROTO_N ((rstack))

	    PROTO_T (RStackP rstack)

{

    rstack->head = NIL (TransStackEntryP);

}

void

rstack_push_frame PROTO_N ((rstack))

		  PROTO_T (RStackP rstack)

{

    TransStackEntryP frame = ALLOCATE (TransStackEntryT);

    frame->next = rstack->head;

    rtrans_init (&(frame->translator));

    rstack->head = frame;

}

void

rstack_compute_formal_renaming PROTO_N ((rstack, names))

			       PROTO_T (RStackP    rstack X

					TypeTupleP names)

{

    ASSERT (rstack->head);

    types_compute_formal_renaming (names, &(rstack->head->translator));

}

void

rstack_compute_formal_inlining PROTO_N ((rstack, names, renames))

			       PROTO_T (RStackP    rstack X

					TypeTupleP names X

					TypeTupleP renames)

{

    SaveRStackT state;

    ASSERT (rstack->head);

    state.head = rstack->head->next;

    types_compute_formal_inlining (names, renames, &(rstack->head->translator),

				   &state);

}

void

rstack_compute_local_renaming PROTO_N ((rstack, names, exclude, table))

			      PROTO_T (RStackP    rstack X

				       TypeTupleP names X

				       TypeTupleP exclude X

				       TableP     table)

{

    SaveRStackT state;

    ASSERT (rstack->head);

    state.head = rstack->head->next;

    types_compute_local_renaming (names, exclude, &(rstack->head->translator),

				  &state, table);

}

void

rstack_add_translation PROTO_N ((rstack, from, to, type, reference))

		       PROTO_T (RStackP rstack X

				EntryP  from X

				EntryP  to X

				EntryP  type X

				BoolT   reference)

{

    ASSERT (rstack->head);

    rtrans_add_translation (&(rstack->head->translator), from, to, type,

			    reference);

}

void

rstack_save_state PROTO_N ((rstack, state))

		  PROTO_T (RStackP     rstack X

			   SaveRStackP state)

{

    state->head = rstack->head;

}

EntryP

rstack_get_translation PROTO_N ((state, entry, type_ref, reference_ref))

		       PROTO_T (SaveRStackP state X

				EntryP      entry X

				EntryP     *type_ref X

				BoolT      *reference_ref)

{

    TransStackEntryP frame = state->head;

    while (frame) {

	EntryP translation;

	translation = rtrans_get_translation (&(frame->translator), entry,

					      type_ref, reference_ref);

	if (translation) {

	    return (translation);

	}

	frame = frame->next;

    }

    return (NIL (EntryP));

}

void

rstack_apply_for_non_locals PROTO_N ((non_local_stack, state, proc, closure))

			    PROTO_T (RStackP     non_local_stack X

				     SaveRStackP state X

				     void      (*proc) PROTO_S ((EntryP,

								 EntryP,

								 GenericP)) X

				     GenericP    closure)

{

    TransStackEntryP frame = non_local_stack->head;

    if ((frame != NIL (TransStackEntryP)) && (state->head)) {

	TransStackEntryP limit = state->head->next;

	for (; frame != limit; frame = frame->next) {

	    rtrans_apply_for_non_locals (&(frame->translator), proc, closure);

	}

    }

}

void

rstack_pop_frame PROTO_N ((rstack))

		 PROTO_T (RStackP rstack)

{

    TransStackEntryP frame = rstack->head;

    rstack->head = frame->next;

    rtrans_destroy (&(frame->translator));

    DEALLOCATE (frame);

}

void

rstack_destroy PROTO_N ((rstack))

	       PROTO_T (RStackP rstack)

{

    while (rstack->head) {

	rstack_pop_frame (rstack);

    }

}

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../library")

 * eval: (include::add-path-entry "../generated")

 * end:

**/