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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;
    }
  }
}