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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) 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: release $

$Date: 1998/02/04 10:43:45 $

$Revision: 1.2 $

$Log: translate.c,v $

 * Revision 1.2  1998/02/04  10:43:45  release

 * Changes during testing.

 *

 * Revision 1.1.1.1  1998/01/17  15:56:07  release

 * First version to be checked into rolling release.

 *

 * Revision 1.11  1996/04/24  08:55:54  currie

 * Case may require 3 regs

 *

 * Revision 1.10  1996/01/17  11:27:11  currie

 * proc with no diagnostics

 *

 * Revision 1.9  1996/01/12  10:06:14  currie

 * AVS - env_offset + main declared but not d3efined

 *

 * Revision 1.8  1995/10/25  13:48:29  currie

 * change to position of .glob

 *

 * Revision 1.7  1995/10/02  10:30:35  currie

 * env_offset + -g (PIC)

 *

 * Revision 1.6  1995/09/20  14:23:10  currie

 * callee-list blunder + fix for silliness in ultrix assembler

 *

 * Revision 1.4  1995/09/12  10:59:45  currie

 * gcc pedanttry

 *

 * Revision 1.3  1995/08/16  16:07:14  currie

 * Shortened some .h names

 *

 * Revision 1.2  1995/06/28  12:15:26  currie

 * New make_stack_limit etc

 *

 * Revision 1.1  1995/04/13  09:08:06  currie

 * Initial revision

 *

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

#include "config.h"

#include "cross_config.h"

#ifndef CROSS_INCLUDE

#include <symconst.h>

#else

#include CROSS_INCLUDE/symconst.h>

#endif

#include "common_types.h"

#include "symtab.h"

#include "installglob.h"

#include "tags.h"

#include "exp.h"

#include "expmacs.h"

#include "optimise.h"

#include "flags.h"

#include "shapemacs.h"

#include "tempdecs.h"

#include "weights.h"

#include "procrectypes.h"

#include "regalloc.h"

#include "new_code.h"

#include "code_here.h"

#include "eval.h"

#include "bitsmacs.h"

#include "needs_scan.h"

#include "ibinasm.h"

#include "syms.h"

#include "out_ba.h"

#include "xalloc.h"

#include "new_symbol.h"

#include "mipsdiags.h"

#include "extern_adds.h"

#include "mips_ins.h"

#include "machine.h"

#include "main.h"

#include "frames.h"

#include "basicread.h"

#include "getregs.h"

#include "locate.h"

#include "me_fns.h"

extern long aritherr_lab;

extern long stackerr_lab;

extern exp find_named_tg(char*, shape);

extern shape f_top;

extern shape f_proc;

procrec * procrecs;

dec ** main_globals;

int main_globals_index;

extern long fscopefile;

extern bool do_extern_adds;

ash ashof

(shape s)

{

	ash a;

	a.ashsize = shape_size(s);

	a.ashalign = shape_align(s);

	return a;

}

bool not_reserved

(char *id)

{

  /* various identifier reserved by MIPS */

  if (!strcmp(id, "edata"))

    return(0);

  if (!strcmp(id, "etext"))

    return(0);

  if (!strcmp(id, "end"))

    return(0);

  if (!strcmp(id, "_ftext"))

    return(0);

  if (!strcmp(id, "_fdata"))

    return(0);

  if (!strcmp(id, "_fbss"))

    return(0);

  if (!strcmp(id, "_gp"))

    return(0);

  if (!strcmp(id, "_procedure_table"))

    return(0);

  if (!strcmp(id, "_procedure_string_table"))

    return(0);

  return(1);

}

char varsize

(shape sha)

{

  return(name(sha) ==nofhd);

}

int current_symno;

void globalise_name

(dec * my_def)

{

	char *id = my_def -> dec_u.dec_val.dec_id;

        if (!my_def -> dec_u.dec_val.extnamed) return;

	if (as_file)

	  fprintf(as_file, "\t.globl\t%s\n", id);

	out_common(symnos[my_def->dec_u.dec_val.sym_number], iglobal);

}

void code_it

(dec * my_def)

{

  exp tg = my_def -> dec_u.dec_val.dec_exp;

  char *id = my_def -> dec_u.dec_val.dec_id;

  long symdef = my_def ->dec_u.dec_val.sym_number;

  bool extnamed =  my_def -> dec_u.dec_val.extnamed;

  static  space tempspace = {

      0, 0

    };

  if (symnos[symdef] <0) goto end; /* ? unused symbols */

  if (son(tg)!= nilexp && (!extnamed || !is_comm(son(tg)))) {

    if (name(son(tg)) == proc_tag

		|| name(son(tg)) == general_proc_tag) {

        diag_descriptor * dd =  my_def -> dec_u.dec_val.diag_info;

	/* compile code for proc */

	if (as_file) {

	  fprintf(as_file,"\t.text\n\t.align 3\n");

	}

	out_common(0, itext);

	out_value(0, ialign, 3, 0);

	if (diagnose) {

	 if (dd != (diag_descriptor*)0) {

	    sourcemark *sm = &dd -> data.id.whence;

	    stabd(fscopefile = find_file(sm->file->file.ints.chars),

	               sm->line_no.nat_val.small_nat);

	 }

	 else { stabd(0,1); /*no diagnostics for this proc */ }

	}

	globalise_name(my_def);

	if (as_file)fprintf(as_file, "\t.ent\t%s\n%s:\n", id, id);

	out_ent (current_symno = symnos[symdef], ient, 2);/* why 2? */

	out_common(symnos[symdef], ilabel);

	if (as_file) {

		fprintf(as_file,

			(diagnose)? "\t.option O1\n" : "\t.option O2\n");

	}

	out_option(1,(diagnose)? 1 : 2);

	symnoforstart(symdef, currentfile);

	settempregs(son(tg));

	code_here(son(tg), tempspace, nowhere);

	if (diagnose && dd != (diag_descriptor*)0) {

		stabd(fscopefile, currentlno+1);

	}

	if (as_file)

	  fprintf(as_file, "\t.end\t%s\n", id);

	out_common(symnoforend(my_def, currentfile), iend);

    }

    else {			/* global values */

	exp c = son(tg);

	IGNORE evaluated(c,(isvar(tg))?(-symdef - 1): symdef + 1, my_def);

    };

  }

  else {	/* global declarations but no definitions or is_comm */

      long  size;

      shape s = (son(tg) ==nilexp)?my_def -> dec_u.dec_val.dec_shape :

				sh(son(tg));

      size = (shape_size(s) + 7) >> 3;

      if ((isvar(tg) || name(s)!= prokhd) && not_reserved(id)) {

	if ((son(tg)!= nilexp && is_comm(son(tg)))

		|| (son(tg) ==nilexp && varsize(sh(tg)))) {

	  if (size !=0) { /* ? ? ! ? */

	     globalise_name(my_def);

	     if (as_file)

	        fprintf(as_file, "\t.comm\t%s %ld\n", id, size);

	      out_value(symnos[symdef], icomm, size, 1);

	  }

	}

	else {

	  if (as_file)

	    fprintf(as_file, "\t.extern\t%s %ld\n", id,

		size);

	  out_value(symnos[symdef], iextern, size, 1);

	}

      }

      else

	if (son(tg) == nilexp && !extnamed) {

	  if (size !=0) { /* ? ? ! ? */

	      if (as_file)

	        fprintf(as_file, "\t.lcomm\t%s %ld\n", id, size);

	      out_value(symnos[symdef], ilcomm, size, 1);

	  }

	}

  }

end:

  my_def -> dec_u.dec_val.processed = 1;

  return;

}

void mark_unaliased

(exp e)

{

  exp p = pt(e);

  bool ca = 1;

  while (p != nilexp && ca) {

    if (bro(p) ==nilexp ||

      (!(last(p) && name(bro(p)) == cont_tag) &&

	!(!last(p) && last(bro(p)) && name(bro(bro(p))) == ass_tag)))

      ca = 0;

    p = pt(p);

  };

  if (ca)

    setcaonly(e);

  return;

}

void remove_unused

(void)

{ dec ** sdef = &top_def;

  while (*sdef != (dec *)0) {

    exp crt_exp = (*sdef) -> dec_u.dec_val.dec_exp;

    bool extnamed = (*sdef) -> dec_u.dec_val.extnamed;

    if (no(crt_exp) == 0 && !extnamed) {

	*sdef = (*sdef) ->def_next;

    }

    else sdef = & ((*sdef) ->def_next);

  }

}

void translate_capsule

(void)

{

  dec * my_def;

  int noprocs;

  int i;

  opt_all_exps();

  remove_unused();

#ifdef INCLUDE_INITS

  my_def = top_def;

  while (my_def != (dec *)0) {

        exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

	char * id = my_def -> dec_u.dec_val.dec_id;

	if (strcmp(id, "main") ==0 && son(crt_exp)!= nilexp &&

		name(son(crt_exp)) == proc_tag) {

	   exp fn = me_obtain(find_named_tg("__DO_I_TDF", f_proc));

	   exp cll = getexp(f_top, nilexp, 0, fn, nilexp, 0, 0, apply_tag);

	   exp * dm = &son(son(crt_exp));

	   exp hld, seq;

	   bro(fn) = cll; setlast(fn);

	   while (name(*dm) ==ident_tag && isparam(*dm))dm = &bro(son(*dm));

	   /* dm is body of main after params */

	   hld = getexp(f_top, *dm, 0, cll, nilexp, 0, 1, 0);

	   seq = getexp(sh(*dm), bro(*dm), last(*dm), hld, nilexp, 0, 0, seq_tag);

	   bro(*dm) = seq; setlast(*dm);

	   bro(cll) = hld; setlast(cll);

	   *dm = seq;

	   break;

	}

        my_def = my_def -> def_next;

   }

#endif

    /* mark static unaliased */

  my_def = top_def;

  while (my_def != (dec *)0) {

    exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

    if (son(crt_exp)!= nilexp &&

	!my_def -> dec_u.dec_val.extnamed &&

	isvar(crt_exp))

      mark_unaliased(crt_exp);

    my_def = my_def -> def_next;

  };

  noprocs = 0;

  my_def = top_def;

  while (my_def != (dec *)0) {

    exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

    if (son(crt_exp)!= nilexp

        && (name(son(crt_exp)) == proc_tag ||

		name(son(crt_exp)) == general_proc_tag)) {

      noprocs++;

    }

    my_def = my_def -> def_next;

  }

  /* count procs */

  procrecs = (procrec *)xcalloc(noprocs, sizeof(procrec));

  noprocs = 0;

  my_def = top_def;

  while (my_def != (dec *)0) {

    exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

    if (son(crt_exp)!= nilexp &&

	(name(son(crt_exp)) == proc_tag || name(son(crt_exp)) == general_proc_tag)) {

      no(son(crt_exp)) = noprocs++;

      /* put index into procrecs in no(proc) */

    }

    my_def = my_def -> def_next;

  }

  if (do_extern_adds) {

	usages = (exp*)xcalloc(noprocs, sizeof(exp));

	my_def = top_def;

  	while (my_def != (dec *)0) {

		exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

		if (son(crt_exp) == nilexp && isvar(crt_exp)) {

			global_usages(crt_exp, noprocs);

			/* try to identify globals ptrs in procs */

		}

		my_def = my_def -> def_next;

	}

  }

  if (diagnose && nofds !=0) {

      init_table_space(nofds, noprocs);

      add_dense_no(0, 0);

      add_dense_no (0, 0);	/* dont know why!! */

      symnosforfiles();

      stab_types();

  }

  else {

    init_table_space(1,noprocs);

    add_dense_no(0, 0);

    add_dense_no (0, 0);	/* dont know why!! */

    IGNORE new_lsym_d("NOFILE.c", 0, stFile, scText, 0, 0);

  };

  /* scan to put everything in MIPS form */

  my_def = top_def;

  while (my_def != (dec *)0) {

    exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

    if (son(crt_exp)!= nilexp

	&& (name(son(crt_exp)) == proc_tag ||

		name(son(crt_exp)) == general_proc_tag)) {

      procrec * pr = &procrecs[no(son(crt_exp))];

      exp * st = &son(crt_exp);

      pr -> needsproc = scan(st, &st);

      pr->callee_size = (callee_size+63) &~63;

    }

    my_def = my_def -> def_next;

  }

  /* calculate the break points for register allocation and do it */

  my_def = top_def;

  while (my_def != (dec *)0) {

    exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

    if (son(crt_exp)!= nilexp

        && (name(son(crt_exp)) == proc_tag ||

		name(son(crt_exp)) == general_proc_tag)) {

      procrec * pr = &procrecs[no(son(crt_exp))];

      needs * ndpr = & pr->needsproc;

      long pprops = (ndpr->propsneeds);

      bool leaf = (pprops & anyproccall) == 0;

      spacereq forrest;

      int   freefixed = 8;	/* NO OF S_REGISTERS */

      int   freefloat = 6;	/* NO OF S $f REGISTERS */

      setframe_flags(son(crt_exp), leaf);

      if (!Has_fp) freefixed++; /* can use $30 as normal caller save */

      if (Has_vcallees) { freefixed--; }

      if (!No_S)IGNORE weightsv(1.0, bro(son(son(crt_exp))));

      /* estimate usage of tags in body of proc */

      forrest = regalloc(bro(son(son(crt_exp))), freefixed, freefloat,

				(PIC_code && !leaf)?32:0);

      /* reg and stack allocation for tags */

      pr -> spacereqproc = forrest;

      setframe_info(son(crt_exp));

    }

    my_def = my_def -> def_next;

  }

  /* put defs in main globals and set up symnos*/

  my_def = top_def;

  main_globals_index = 0;

  while (my_def != (dec*)0) {

  	main_globals_index++;

  	my_def = my_def -> def_next;

  }

  data_lab = (main_globals_index > 33)?main_globals_index:33;

  main_globals = (dec**)xcalloc(main_globals_index, sizeof(dec*));

  symnos = (int *)xcalloc(main_globals_index, sizeof(int));

  my_def = top_def;

  for (i=0; i < main_globals_index; i++) {

  	main_globals[i] = my_def;

  	my_def = my_def -> def_next;

  }

    /* ... and set in the position and "addresses" of the externals */

  for (i = 0; i < main_globals_index; i++) {

    exp tg = main_globals[i] -> dec_u.dec_val.dec_exp;

    char *id = main_globals[i] -> dec_u.dec_val.dec_id;

    bool extnamed = main_globals[i] -> dec_u.dec_val.extnamed;

    diag_descriptor * dinf = main_globals[i] -> dec_u.dec_val.diag_info;

    main_globals[i] ->dec_u.dec_val.sym_number = i;

    if (no(tg)!= 0 || (extnamed && son(tg)!= nilexp)

		|| strcmp(id,"__TDFhandler") == 0

		|| strcmp(id,"__TDFstacklim") ==0

	) {

     	if (no(tg) ==1 && son(tg) ==nilexp && dinf != (diag_descriptor *)0

 		 /* diagnostics only! */ ) {

    		symnos[i] = -1;

    	}

    	else {

          no(tg) = (i + 1)* 64 + 32;

          symnos[i] = symnoforext(main_globals[i], mainfile);

        }

    }

    else

      symnos[i] = -1;

  };

  setregalt(nowhere.answhere, 0);

  nowhere.ashwhere.ashsize = 0;

  nowhere.ashwhere.ashsize = 0;

  if (as_file) {

    fprintf(as_file, "\t.verstamp %d %d\n", majorno, minorno);

    if (PIC_code) {

	fprintf(as_file, "\t.option pic2\n");

    }

    else {

        fprintf(as_file,(diagnose)? "\t.option O1\n" : "\t.option O2\n");

    }

  }

  out_verstamp(majorno, minorno);

				/* this is the only? use of these nos, to

				   satisfy as1 */

  if (PIC_code) {

	out_option(2, 2);

  }

  else

  { out_option(1,(diagnose)? 1 : 2); }

  if (diagnose && nofds!=0) {

    stab_file(0);

  }

  else

  {

    currentfile = 0;

  }

  /* compile procedures, evaluate constants, put in the .comm entries for

     undefined objects */

  my_def = top_def;

/*

  while (my_def != (dec *) 0) {

    exp tg = my_def -> dec_u.dec_val.dec_exp;

    char *id = my_def -> dec_u.dec_val.dec_id;

    bool extnamed = my_def -> dec_u.dec_val.extnamed;

    if (son (tg) != nilexp && (extnamed || no (tg) != 0 || !strcmp (id, "main"))) {

      if (extnamed) {

	if (as_file)

	  fprintf (as_file, "\t.globl\t%s\n", id);

	out_common (symnos[my_def->dec_u.dec_val.sym_number], iglobal);

      }

    }

    my_def = my_def -> def_next;

  }

*/

  my_def = top_def;

  while (my_def != (dec *)0) {

    if (!my_def -> dec_u.dec_val.processed)

       code_it(my_def);

    my_def = my_def -> def_next;

  };

  return;		/* return 1 for error, 0 for good */

}

void translate_unit

(void)

{

  if (separate_units)

   {

     dec * my_def;

     translate_capsule();

     my_def = top_def;

     while (my_def != (dec *)0) {

       exp crt_exp = my_def -> dec_u.dec_val.dec_exp;

       no(crt_exp) = 0;

       pt(crt_exp) = nilexp;

       my_def = my_def -> def_next;

     };

     crt_repeat = nilexp;

     repeat_list = nilexp;

   };

  return;

}

void translate_tagdef

(void)

{

  return;

}