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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.

*/

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

$Author: pwe $

$Date: 1998/03/11 11:03:24 $

$Revision: 1.4 $

$Log: inline.c,v $

 * Revision 1.4  1998/03/11  11:03:24  pwe

 * DWARF optimisation info

 *

 * Revision 1.3  1998/02/18  11:22:11  pwe

 * test corrections

 *

 * Revision 1.2  1998/01/20  17:14:23  release

 * Parameter named 'formal' confused SCO cc.

 *

 * Revision 1.1.1.1  1998/01/17  15:55:47  release

 * First version to be checked into rolling release.

 *

 * Revision 1.5  1997/10/23  09:24:25  pwe

 * extra diags

 *

 * Revision 1.4  1997/08/23  13:24:09  pwe

 * no invert order, and NEWDIAGS inlining

 *

Revision 1.3  1997/03/20 17:05:12  currie

Dwarf2 diags

Revision 1.2  1997/02/18 12:56:28  currie

NEW DIAG STRUCTURE

Revision 1.1  1995/04/06 10:44:05  currie

Initial revision

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

#include "config.h"

#include "common_types.h"

#include "exp.h"

#include "expmacs.h"

#include "check.h"

#include "tags.h"

#include "shapemacs.h"

#include "me_fns.h"

#include "externs.h"

#include "flags.h"

#ifdef NEWDIAGS

#include "dg_globs.h"

#include "dg_aux.h"

#endif

#include "inline.h"

/* PROCEDURES */

static exp last_action

    PROTO_N ( (e) )

    PROTO_T ( exp e )

{

  if (e == nilexp)

    return e;

  if (name(e) == ident_tag || name(e) == seq_tag) {

    return last_action(bro(son(e)));

  }

  return e;

}

static void change_last_shapes

    PROTO_N ( (e, sha) )

    PROTO_T ( exp e X shape sha )

{

  if (e == nilexp)

    return;

  if (name(e) == ident_tag || name(e) == seq_tag) {

    sh(e) = sha;

    change_last_shapes(bro(son(e)), sha);

  }

  return;

}

  /* replaces a formal paramter by an actual parameter */

static void replace_pars

    PROTO_N ( (actual, formal_par) )

    PROTO_T ( exp actual X exp formal_par )

{

  exp def;

  if (!last(actual))

     replace_pars(bro(actual), bro(son(formal_par)));

  clearparam(formal_par);

  def = son(formal_par);

  if (no(formal_par) == 1 &&

	shape_size(sh(pt(formal_par))) == 8)

    setvis(formal_par);

  replace(def, actual, formal_par);

  retcell(def);

  return;

}

  /* inlines the procedure application e */

void inline_exp

    PROTO_N ( (e) )

    PROTO_T ( exp e )

{

  exp fn = son(e);	/* the name_tag for the function */

  exp pars = bro(fn);	/* the first actual parameter */

  exp body = son(son(son(fn)));	/* the proc_tag exp */

  exp bc, t, q;

  exp lab;

  exp var;		/* the destination to which the result is to

  			   be assigned */

  exp new_var = nilexp;

  exp new_dec;	/* a new variable declaration if we make one */

  shape sha = sh(e);	/* the shape delivered by the application */

  exp cond_alt;

  exp res;

  exp last_act;

  if (name(sha) == tophd) {	/* not returning a result, no ass needed */

    var = nilexp;

    cond_alt = f_make_top();

  }

  else {

    if (last(e) && name(bro(e)) == ass_tag &&

	  name(son(bro(e))) == name_tag) {

	  	/* the result of the application is being assigned to

		   a name_tag */

      var = son(bro(e));/* the destination of the ass */

      cond_alt = f_make_top();	/* the result is being assigned in the

      				   body - no need for a delivered result */

      e = bro(e); /* NOTE e CHANGED to ass_tag */

#ifdef NEWDIAGS

      if (diagnose) {	/* bro(son(e)) is now the call */

	dg_whole_comp (e, bro(son(e)));

	dgf(e) = dgf(bro(son(e)));

      }

#endif

    }

    else {

      new_dec = me_start_clearvar(sha, sha);

      	/* make a new variable to assign to at each res_tag */

      setinlined(new_dec);	/* mark the declaration */

      new_var = me_obtain(new_dec);

      var = new_var;	/* the destination of assignments

      			   new_var is killed at end */

      cond_alt = f_contents(sha, copy(new_var));

      	/* delivers the contents of the variable - hence the value */

    };

  };

  lab = me_b3(sh(cond_alt), me_shint(sha, 0), cond_alt, labst_tag);

  	/* the labst for the new cond_tag we are making up */

  name(son(lab)) = clear_tag;

  t = fn; /* start t so that its bro is the first actual parameter */

  q = body;	/* start q so that its son is the first formal parameter */

  while (!last(t))	/* check actual and formal shapes */

    {

      if (name(q) != ident_tag || !isparam(q))

	return;  /* no inline if more actuals than formals */

      if (shape_size(sh(bro(t))) != shape_size(sh(son(q))))

        return;	/* no inlining if shapes do not match. */

      t = bro(t);	/* next actual */

      q = bro(son(q));	/* next formal */

    };

  if (name(q) == ident_tag && isparam(q))

    return;  /* no inline if more formals than actuals */

#ifdef NEWDIAGS

  doing_inlining = 1;

#endif

  bc = copy_res(body, var, lab);

  	/* copy the body, making res_tag into assignment to var and

	   jump to lab */

#ifdef NEWDIAGS

  doing_inlining = 0;

#endif

  bc = hold(bc);

  if (!last(fn)) {	/* if there are any parameters */

    replace_pars(pars, son(bc)); /* replace formals by actuals */

  }

  IGNORE check(son(bc), son(bc));	/* check the result (proc_tag ?)*/

  res = son(bc); /* remove the proc_tag */

  retcell(bc);	/* and retcell it */

  last_act = last_action(res);

  if (no(son(lab)) == 1 && name(last_act) == goto_tag &&

        pt(last_act) == lab) {

     /* there is only one (final) goto replacement for return */

    if (name(res) == goto_tag) {

      res = (name(sha)==tophd)?f_make_top():f_make_value(sha);

    }

    else {

      change_last_shapes(res, sh(bro(son(lab))));

#ifdef NEWDIAGS

      if (diagnose)

	dg_whole_comp (last_act, bro(son(lab)));

#endif

      replace(last_act, bro(son(lab)), res);

    }

  }

  else

    res = me_b3(sh(lab), res, lab, cond_tag);

  	/* make up the cond out of the substituted exp and lab */

  if (var != nilexp)

    kill_exp(var, var);

  if (new_var != nilexp) { /* we made up a new variable */

    SET(new_dec);

    if (no(new_dec) != 1) {

      res = me_complete_id(new_dec, res);	/* complete the variable def */

    }

    else {

      exp r = f_make_top();

#ifdef NEWDIAGS

      if (diagnose)

	dgf(r) = dgf(bro(son(lab)));

#endif

      replace(bro(son(lab)), r, r);

    }

  };

#ifdef NEWDIAGS

  if (diagnose)

    dg_complete_inline (e, res);

#endif

  replace(e, res, nilexp);	/* replace the call by the inlined stuff */

  kill_exp(fn, fn);	/* kill off the function name_tag */

  return;

}