/* This file is part of GNU epsilon, a functional language implementation

Copyright (C) 2002, 2003 Luca Saiu

GNU epsilon is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.

GNU epsilon is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

You should have received a copy of the GNU General Public License
along with epsilon; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */


/* Code for the s_fscll instruction. This is slightly more efficient than s_scll, but only
   works when 1 <= PARAMETER_1 <= MAXIMUM_SMALL_HOMOGENEOUS_SIZE */

word_t* closure;
word_t* new_environment;
integer_t i;

new_environment = allocate_exact((integer_t)PARAMETER_1 + 1);

closure = (word_t*)(stack[undertop_stack_pointer - ((integer_t)PARAMETER_1) + 1]);

/* Copy actual parameters into the new environment: the last one
   is in the top register, the previous ones are in the stack. */
for(i = 1; i < ((integer_t)PARAMETER_1); i++)
  new_environment[i] = stack[undertop_stack_pointer - ((integer_t)PARAMETER_1) + i + 1];
new_environment[(integer_t)PARAMETER_1] = top;

/* Copy the s-link into the new environment: */
new_environment[0] = closure[1];

/* This is a sibling call: there is never need to resize the stack. */

/* Overwrite the current frame. The (conceptually) new frame just contains
   old_FP, old_env and old_IP.
   old_FP, old_env and old_IP do not change. */
top = (word_t)(stack[frame_pointer + 2]);

/* FP does not change. Update undertop_stack_pointer, environment and IP: */
undertop_stack_pointer = frame_pointer + 1;
environment = new_environment;

GOTO_GENERIC(closure[0]);
