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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.

*/

/* 	frames.c,v 1.5 1995/09/29 09:45:02 john Exp	 */

#ifndef lint

static char vcid[] = "frames.c,v 1.5 1995/09/29 09:45:02 john Exp";

#endif /* lint */

#include "config.h"

#include "common_types.h"

#include "frames.h"

#include "procrecs.h"

#include "expmacs.h"

#include "tags.h"

#include "bitsmacs.h"

#include "reg_defs.h"

#include "fail.h"

#include "cross.h"

#include "bool.h"

extern int bitsin PROTO_S ((int32));

extern exp father PROTO_S ((exp));

bool Has_fp = FALSE;

bool Has_tos = FALSE;

bool No_S = FALSE;

bool Has_vcallees = FALSE;

bool Has_no_vcallers = TRUE;

int local_reg = 14;

int callee_size;

#define max(x,y)	(x>y)?x:y

#define min(x,y)        (x>y)?y:x

void setframe_flags

    PROTO_N ( ( e,leaf ) )

    PROTO_T ( exp e X bool leaf )

{

   /* e is proc_tag */

  No_S = (!leaf && (name(e) != general_proc_tag || !proc_has_nolongj(e))

	  && proc_uses_crt_env(e) && proc_has_lv(e));

  Has_fp = (No_S || proc_has_alloca(e)|| name(e) == general_proc_tag);

  Has_tos = (No_S && proc_has_alloca(e));

  Has_vcallees = (name(e) == general_proc_tag && proc_has_vcallees(e));

  Has_no_vcallers = (name(e) == proc_tag || !proc_has_vcallers(e));

#ifdef Try_No_S

  No_S = TRUE;

#endif

#ifdef Try_Has_fp

  Has_fp = !leaf;

#endif

#ifdef Try_Has_tos

  Has_tos = TRUE;

#endif      

}

/*

  sets up the size of the frame, and the positions in which to 

  save the registers.

*/

void setframe_info

    PROTO_N ( ( e ) )

    PROTO_T ( exp e )

{

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

  needs * ndpr = & pr->needsproc;

  spacereq *sppr = & pr->spacereqproc;

  long pprops = (ndpr->propsneeds);

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

  int ma = ndpr->maxargs;	/* maxargs of proc body in bits */	

  int pa = ndpr->numparams;

  long st = sppr->stack;	/* space for locals in bits */

  int nofixdump;

  int nofloatdump;

  int save_offset;

  setframe_flags(e, leaf);

  if(has_c_vararg(e) || !Has_no_vcallers){

    pa=12*64;	/* should be 11 */

  }

  else{

    pa=min(pa,6*64);

  }

  st = (st + 32) & ~63;

  pa = (pa+32)&~63;

  ma = (ma + 32) & ~63;	/* put on 64 bit boundaries */

  pr->max_args = ma;

  save_offset=max(ma-384,0);

  /* locate the register to be saved */

  pr->fixdump = sppr->fixdump<<9;/* 8 */

  if (!leaf ) {

    pr->fixdump |= 1 << RA;

  }	/* space for return address */

  if(No_S) {

    pr->fixdump |= (Has_fp)?0x7e00:0xfe00;

  }

  pr->floatdump = (sppr->fltdump<<1);	/* wrong! */

  nofixdump = bitsin (pr->fixdump);

  nofloatdump = bitsin (pr->floatdump);

  /* no of fixed s-regs to be dumped */

  pr->frame_size=pa+st+save_offset+(nofixdump+nofloatdump)*64;

  pr->frame_size+=((has_float(e)!=0 || !optop(e))?64:0);

  /* reserve an extra quadword for float reg <-> general reg 

     transfers */

  if (Has_fp) { 

    pr->frame_size +=64; /* extra word for old fp  */

/*    pr->callee_size += 128;*/

  }

  pr->dumpstart=save_offset>>3;

  pr->fldumpstart=pr->dumpstart+8*nofixdump;

  pr->locals_offset = (pr->fldumpstart + 8*(nofloatdump+(has_float(e)!=0 ||

							 !optop(e))))<<3;

  pr->paramsdumpstart = pr->locals_offset+st + ((Has_fp)?64:0);

  return;

}	

int frame_offset

    PROTO_N ( ( id ) )

    PROTO_T ( exp id )

{

  exp p;

  procrec * pr;

  int  x = no (id);

  int  b = x & 0x3f;

  Assert(name(id) == ident_tag);

  for (p = father(id); name(p)!=proc_tag && name(p)!=general_proc_tag; 

		       p = father(p));

  pr = & procrecs[no(p)];

  if((b == SP) || (b == FP)){

    return ((x - b) >> 4) + 

      ((pr->locals_offset - pr->frame_size - pr->callee_size)>>3);

  }	

  else if (b == local_reg){

    return ((x-b)>>4) + (pr->locals_offset>>3) - (pr->frame_size>>3) 

      /*- (pr->callee_size>>3)*/;

  }

  else{

    bool Has_vcallees = (name(p) == general_proc_tag && proc_has_vcallees(p));

    int n = -8 - (no(son(id))>>3);

    if(isparam(id) && name(son(id)) != formal_callee_tag){

      return n;

    }	

    else if(isparam(id) && name(son(id)) == formal_callee_tag){

      return ((Has_vcallees)?n:((pr->callee_size>>3) - n));

    }

    else{

      failer("Illegal frame offset");

      return 0;

    }

  }

}