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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1998

    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.

*/

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

$Author: pwe $

$Date: 1998/03/15 16:00:36 $

$Revision: 1.2 $

$Log: dw2_locdata.c,v $

 * Revision 1.2  1998/03/15  16:00:36  pwe

 * regtrack dwarf dagnostics added

 *

 * Revision 1.1  1998/03/11  11:03:46  pwe

 * DWARF optimisation info

 *

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

#include "config.h"

#include "common_types.h"

#include "dg_types.h"

#include "dw2_config.h"

#include "dw2_basic.h"

#include "dw2_codes.h"

#include "dw2_iface.h"

#include "dw2_info.h"

#include "expmacs.h"

#include "tags.h"

#include "basicread.h"

#include "xalloc.h"

#include "externs.h"

#include "dg_aux.h"

#include "dw2_locdata.h"

/* Location list information is collected for each object, held via

   fields of the 'obtain_value' exp (which is a hold_tag). last is set if the

   object is master of a new location. bro is used to hold references to other

   objects that share this location (as a bro list).  no is label for shared

   location set.  pt holds other more temporary uses (via ll_item).

*/

#define	LOp_Non_Current 1

#define	LOp_Locked	2

#define	LOp_Const	3

#define	LOp_Shared	4

#define	LOp_Portion	5

typedef enum {

	LL_OPTLOCK = 1,

	LL_CONST,

	LL_RET,

	LL_REGSHARE,

	LL_MASTERSHARE

} loclist_key;

typedef struct rs_s {

	long		start;

	long		end;

	long		share;

	dg_name		nm;

	int		reg;

	struct rs_s	*next_share;

	struct rs_s	*next_loc;

} *regshare_item;

typedef struct rsl_s {

	dg_name		alloc;

	int		reg;

	regshare_item	items;

	struct rsl_s	*next;

} *regshare_list;

typedef struct ll_s {

	int		key:8;

	int		open:1;

	int		has_inner:1;

	union {

		dg_info		d;

		retrec		*r;

		regshare_item	l;

	} u;

	struct ll_s	*next;

	struct ll_s	*inner;

} *ll_item;

static ll_item *

ll_root(dg_name nm)

{

	exp x = nm->data.n_obj.obtain_val;

	exp * ref = & (pt(x));

	return(ll_item *)((void *)ref);

}

static ll_item

new_ll_item(loclist_key k, int o)

{

	ll_item ans = (ll_item)xmalloc(sizeof(struct ll_s));

	ans->key = k;

	ans->open = ans->has_inner = o;

	ans->next = (ll_item)0;

	ans->inner = (ll_item)0;

	return ans;

}

static regshare_list all_regshares = (regshare_list)0;

void *

dw_new_regshare(dg_name nm, int reg)

{

	regshare_list ans = (regshare_list)xmalloc(sizeof(struct rsl_s));

	ans->alloc = nm;

	ans->reg = reg;

	ans->items = (regshare_item)0;

	ans->next = all_regshares;

	all_regshares = ans;

	return (void *)ans;		/* actual type local to this file */

}

void

dw_add_regshare(void * w, dg_name nm, long start, long end)

{

	regshare_list holder = (regshare_list)w;

	regshare_item item = (regshare_item)xmalloc(sizeof(struct rs_s));

	item->start = start;

	item->end = end;

	item->share = 0;

	item->nm = nm;

	item->next_share = holder->items;

	item->next_loc = (regshare_item)0;

	holder->items = item;

	return;

}

obj_list *local_objects = (obj_list *)0;

static void

check_taggable(dg_name nm)

{

	if (!nm->mor || !nm->mor->this_tag) {

		IGNORE f_dg_tag_name(gen_tg_tag(), nm);

	}

	return;

}

void

set_locdata(obj_list this_obl)

{

	dg_name this_nm = this_obl.obj;

	while (this_nm) {

		if (this_nm->key == DGN_OBJECT) {

			exp x = this_nm->data.n_obj.obtain_val;

			exp id;

			if (x && (id = dw_has_location(son(x)), id)) {

				if (isglob(id)) {

					dg_name master =

					    brog(id)->dec_u.dec_val.diag_info;

					if (!master) {

						master = brog(id)->dec_u.dec_val.diag_info = this_nm;

					}

					if (master == this_nm) {

						setlast(x);

						no(x) = next_dwarf_label();

					} else {

						exp y = master->data.n_obj.obtain_val;

						setbro(x, bro(y));

						setbro(y,

						       (exp)((void *)this_nm));

						no(x) = no(y);

						check_taggable(master);

						check_taggable(this_nm);

					}

				} else {

					int found = 0;

					obj_list * obl = local_objects;

					while (obl && !found) {

						dg_name nm = obl->obj;

						while (nm) {

							if (nm->key == DGN_OBJECT) {

								exp y = nm->data.n_obj.obtain_val;

								if (y && last(y) && dw_has_location(son(y)) == id) {

									setbro(x, bro(y));

									setbro(y, (exp)((void *)this_nm));

									no(x) = no(y);

									check_taggable(nm);

									check_taggable(this_nm);

									found = 1;

									break;

								}

							}

							if (!obl->islist) {

								break;

							}

							nm = nm->next;

						}

						obl = obl->next;

					}

					if (!found) {

						setlast(x);

						no(x) = next_dwarf_label();

						dw_allocated(this_nm, id);

					}

				}

			} else {

				no(x) = 0;

			}

		}

		if (!this_obl.islist) {

			break;

		}

		this_nm = this_nm->next;

	}

}

void

close_locdata(obj_list this_obl)

{

	dg_name this_nm = this_obl.obj;

	while (this_nm) {

		if (this_nm->key == DGN_OBJECT) {

			exp x = this_nm->data.n_obj.obtain_val;

			if (x && last(x)) {

				dw_deallocated(this_nm);

			}

		}

		if (!this_obl.islist) {

			break;

		}

		this_nm = this_nm->next;

	}

}

dg_name

find_equiv_object(exp e, int isc)

{

	obj_list *obl = local_objects;

	while (obl) {

		dg_name nm = obl->obj;

		while (nm) {

			if (nm->key == DGN_OBJECT) {

				exp x = nm->data.n_obj.obtain_val;

				if (isc) {

					if (x && name(son(x)) == cont_tag &&

					    dw_loc_equivalence(e,

							       son(son(x)))) {

						return nm;

					}

				} else {

					if (x && dw_loc_equivalence(e,

								    son(x))) {

						return nm;

					}

				}

			}

			if (!obl->islist) {

				break;

			}

			nm = nm->next;

		}

		obl = obl->next;

	}

	return(dg_name)0;

}

static dg_name

find_simple_object(exp e)

{

	/* e is name_tag for required object */

	obj_list *obl = local_objects;

	while (obl) {

		dg_name nm = obl->obj;

		while (nm) {

			if (nm->key == DGN_OBJECT) {

				exp x = nm->data.n_obj.obtain_val;

				while (x && (name(x) == hold_tag ||

					     name(x) == cont_tag ||

					     name(x) == reff_tag)) {

					x = son(x);

				}

				if ((x) && name(x) == name_tag &&

				    son(x) == son(e) &&

				    (no(x) <= no(e)) &&

				    (no(x) + shape_size(sh(x))) >=

				    (no(e) + shape_size(sh(e)))) {

					return nm;

				}

			}

			if (!obl->islist) {

				break;

			}

			nm = nm->next;

		}

		obl = obl->next;

	}

	return(dg_name)0;

}

void

set_optim_objects(dg_info optim, int start)

{

	objset *obj = optim->data.i_optim.objs;

	while (obj) {

		dg_name nm = obj->tg->p.nam;

		if (start) {

			ll_item *l = ll_root(nm);

			while (*l) {

				if ((*l)->open) {

					l = & ((*l)->inner);

				} else {

					l = & ((*l)->next);

				}

			}

			*l = new_ll_item(LL_OPTLOCK, 1);

			(*l)->u.d = optim;

		} else {

			ll_item l = *ll_root(nm);

			while (l->key != LL_OPTLOCK || l->u.d != optim) {

				if ((l)->open) {

					l = l->inner;

				} else {

					l = l->next;

				}

			}

			l->open = 0;

		}

		obj = obj->next;

	}

	return;

}

void

set_remval_object(dg_info rmv)

{

	dg_name nm = find_simple_object(son(rmv->data.i_remval.var));

	if (nm) {

		ll_item *l = ll_root(nm);

		while (*l) {

			if ((*l)->open) {

				l = &((*l)->inner);

			} else {

				l = &((*l)->next);

			}

		}

		*l = new_ll_item(LL_CONST, 0);

		(*l)->u.d = rmv;

	}

	return;

}

void

set_obj_rets(retrec * rec)

{

	obj_list *obl = local_objects;

	while (obl) {

		dg_name nm = obl->obj;

		while (nm) {

			if (nm->key == DGN_OBJECT) {

				exp x = nm->data.n_obj.obtain_val;

				while (x && (name(x) == hold_tag ||

					     name(x) == cont_tag ||

					     name(x) == reff_tag)) {

					x = son(x);

				}

				if ((x) && name(x) == name_tag &&

				    !isdiscarded(x) &&

				    !isglob(son(x))) {

					ll_item *l = ll_root(nm);

					while (*l) {

						if ((*l)->open) {

							l = &((*l)->inner);

						} else {

							l = &((*l)->next);

						}

					}

					*l = new_ll_item(LL_RET, 0);

					(*l)->u.r = rec;

				}

			}

			if (!obl->islist) {

				break;

			}

			nm = nm->next;

		}

		obl = obl->next;

	}

	return;

}

static ll_item

find_ll_item(dg_name nm, loclist_key k, int force)

{

	ll_item *ll = ll_root(nm);

	ll_item l = *ll;

	while (l && l->key != k) {

		l = l->next;

	}

	if (!l && force) {

		l = new_ll_item(k, 0);

		l->u.l = (regshare_item)0;

		l->next = *ll;

		*ll = l;

	}

	return l;

}

static void

out_regshare_set(regshare_item it)

{

	regshare_item this = it;

	while (this) {

		dg_name nm = this->nm;

		if (nm) {

			regshare_item look = it;

			while (look->nm != nm) {

				/* avoid duplicates */

				look = look->next_share;

			}

			if (look == this) {

				dw_at_ext_address(nm->mor->this_tag);

			}

		}

		this = this->next_share;

	}

	return;

}

void

init_dw_locdata(void)

{

	all_regshares = (regshare_list)0;

	local_objects = (obj_list *)0;

	dw_all_deallocated();

	return;

}

void

complete_dw_locdata(void)

{

	regshare_list top_l = all_regshares;

	while (top_l) {

		dg_name master = top_l->alloc;

		int reg = top_l->reg;

		regshare_item regitem = top_l->items;

		dg_name nm;

		if (master) {

			while (regitem) {

				nm = master;

				do {

					if (regitem->nm == nm) {

						regitem->nm = (dg_name)0;

						break;

					}

					nm = (dg_name)((void *)bro(nm->data.n_obj.obtain_val));

				} while (nm);

				if (!nm) {

					/* regitem not in allocation shareset */

					ll_item l =

					    find_ll_item(master,

							 LL_MASTERSHARE, 1);

					if (!l->u.l) {

						/* start of extra share list

						 * for master */

						l->u.l = regitem;

					}

					regitem->share =

					    no(master->data.n_obj.obtain_val);

					regitem->reg = reg;

					l = find_ll_item(regitem->nm,

							 LL_REGSHARE, 1);

					regitem->next_loc = l->u.l;

					l->u.l = regitem;

					check_taggable(regitem->nm);

					check_taggable(master);

				}

				regitem = regitem->next_share;

			}

		} else {

			long share = 0;

			master = nm = (dg_name)0;

			while (regitem) {

				if (!master) {

					master = regitem->nm;

				}

				if (!nm) {

					nm = regitem->nm;

				}

				if (nm != master) {

					share = next_dwarf_label();

					break;

				}

				regitem = regitem->next_share;

			}

			regitem = top_l->items;

			while (regitem) {

				ll_item l = find_ll_item(regitem->nm,

							 LL_REGSHARE, 1);

				regitem->share = share;

				if (share) {

					check_taggable(regitem->nm);

				}

				regitem->reg = reg;

				regitem->next_loc = l->u.l;

				l->u.l = regitem;

				regitem = regitem->next_share;

			}

			if (share) {

				enter_section("debug_loc");

				out_dwf_label(share, 1);

				out_regshare_set(top_l->items);

				exit_section();

			}

		}

		top_l = top_l->next;

	}

	return;

}

static int

obj_decide(ll_item l)

{

	int ans = 0, x;

	while (l && ans < 2) {

		switch (l->key) {

		case LL_OPTLOCK:

		case LL_CONST:

		case LL_MASTERSHARE:

			return 2;

		case LL_RET:

			if (!ans) {

				ans = 1;

			}

			break;

		case LL_REGSHARE: {

			regshare_item rs = l->u.l;

			while (rs && ans<2) {

				if (rs->share) {

					ans = 2;

				} else if (!ans) {

					ans = 1;

				}

				rs = rs->next_loc;

			}

			break;

		}

		}

		if (l->has_inner && (x = obj_decide(l->inner), x > ans)) {

			ans = x;

		}

		l = l->next;

	}

	return ans;

}

int

decide_ll_type(exp x)

{

	/* 1 if need location list, 2 if extension list */

	ll_item l = (ll_item)((void *)(pt(x)));

	if ((last(x) && bro(x)) || (!last(x) && no(x))) {

		/* main location is shared */

		return 2;

	} else {

		return obj_decide(l);

	}

}

static long startlab;

static int ll_ok;

static exp obval;

static void

loclist_portion(ll_item l)

{

	while (l) {

		switch (l->key) {

		case LL_CONST:

			ll_ok = 0;

			break;

		case LL_RET: {

			long endlab = l->u.r->lab;

			if (ll_ok && endlab != startlab) {

				out_loc_range(startlab, endlab, 0);

				dw2_locate_exp(obval, 0, 1);

			}

			startlab = l->u.r->over;

			break;

		}

		case LL_REGSHARE: {

			regshare_item rs = l->u.l;

			while (rs) {

				out_loc_range(rs->start, rs->end, 1);

				out16();

				if (rs->reg < 32) {

					outn((long)1);

					outnl();

					out8();

					outn((long)(DW_OP_reg0 + rs->reg));

				} else {

					outn((long)(1 + uleb128_length((unsigned long)rs->reg)));

					outnl();

					out8();

					outn((long)DW_OP_regx);

					outs(", ");

					uleb128((unsigned long)rs->reg);

				}

				outnl();

				rs = rs->next_loc;

			}

		}

		default:

			break;

		}

		if (l->has_inner) {

			loclist_portion(l->inner);

		}

		l = l->next;

	}

	return;

}

void

out_obj_loclist(long l1, long l2, exp x)

{

	ll_item l = (ll_item)((void *)(pt(x)));

	startlab = l1;

	ll_ok = 1;

	obval = son(x);

	loclist_portion(l);

	if (ll_ok && l2 != startlab) {

		out_loc_range(startlab, l2, 0);

		dw2_locate_exp(obval, 0, 1);

	}

	return;

}

static void

extlist_portion(ll_item l)

{

	while (l) {

		switch (l->key) {

		case LL_CONST: {

			long here = l->u.d->data.i_remval.lo_pc;

			if (ll_ok && here != startlab) {

				out_loc_range(startlab, here, 0);

				dw_at_data(1, LOp_Const);

				dw_out_const(obval);

			}

			startlab = here;

			ll_ok = 1;

			obval = l->u.d->data.i_remval.val;

			break;

		}

		case LL_OPTLOCK:

			out_loc_range(l->u.d->data.i_optim.lo_pc,

				      l->u.d->data.i_optim.hi_pc, 0);

			dw_at_data(1, LOp_Locked);

			dw_at_data(1, l->u.d->data.i_optim.reason);

			break;

		case LL_REGSHARE: {

			regshare_item rs = l->u.l;

			while (rs) {

				if (rs->share) {

					out_loc_range(rs->start, rs->end, 1);

					dw_at_data(1, LOp_Shared);

					dw_at_address(rs->share);

				}

				rs = rs->next_loc;

			}

		}

		default:

			break;

		}

		if (l->has_inner) {

			loclist_portion(l->inner);

		}

		l = l->next;

	}

	return;

}

void

out_obj_extloclist(long l1, long l2, exp x)

{

	ll_item l = (ll_item)((void *)(pt(x)));

	if ((last(x) && bro(x)) || (!last(x) && no(x))) {

		/* main location is shared */

		out_loc_range(l1, l2, 0);

		dw_at_data(1, LOp_Shared);

		dw_at_address(no(x));

	}

	startlab = l1;

	ll_ok = 0;

	if (l) {

		extlist_portion(l);

	}

	if (ll_ok && l2 != startlab) {

		out_loc_range(startlab, l2, 0);

		dw_at_data(1, LOp_Const);

		dw_out_const(obval);

	}

	return;

}

void

out_obj_shared_set(dg_name dn)

{

	exp x = dn->data.n_obj.obtain_val;

	ll_item l = find_ll_item(dn, LL_MASTERSHARE, 0);

	if (last(x) && (bro(x) || l)) {

		out_dwf_label(no(x), 1);

		dw_at_ext_address(dn->mor->this_tag);

		while (bro(x)) {

			dg_name nm = (dg_name)((void *)bro(x));

			dw_at_ext_address(nm->mor->this_tag);

			x = nm->data.n_obj.obtain_val;

		}

		if (l) {

			out_regshare_set(l->u.l);

		}

		out32();

		outs("0");

		outnl_comment("share list end");

	}

	return;

}