/* Copyright (C) 2001, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include <string.h>
#include "_scm.h"
#include "modules.h"
#include "programs.h"
#include "procprop.h" /* scm_sym_name */
#include "vm.h"


static SCM write_program = SCM_BOOL_F;

SCM_DEFINE (scm_make_rtl_program, "make-rtl-program", 1, 2, 0,
	    (SCM bytevector, SCM byte_offset, SCM free_variables),
	    "")
#define FUNC_NAME s_scm_make_rtl_program
{
  scm_t_uint8 *code;
  scm_t_uint32 offset;

  if (!scm_is_bytevector (bytevector))
    scm_wrong_type_arg (FUNC_NAME, 1, bytevector);
  if (SCM_UNBNDP (byte_offset))
    offset = 0;
  else
    {
      offset = scm_to_uint32 (byte_offset);
      if (offset > SCM_BYTEVECTOR_LENGTH (bytevector))
        SCM_OUT_OF_RANGE (2, byte_offset);
    }

  code = (scm_t_uint8*) SCM_BYTEVECTOR_CONTENTS (bytevector) + offset;
  if (((scm_t_uintptr) code) % 4)
    SCM_OUT_OF_RANGE (2, byte_offset);

  if (SCM_UNBNDP (free_variables) || scm_is_false (free_variables))
    return scm_cell (scm_tc7_rtl_program, (scm_t_bits) code);
  else
    abort ();
}
#undef FUNC_NAME

SCM_DEFINE (scm_rtl_program_code, "rtl-program-code", 1, 0, 0,
            (SCM program),
            "")
#define FUNC_NAME s_scm_rtl_program_code
{
  SCM_VALIDATE_RTL_PROGRAM (1, program);

  return scm_from_uintptr_t ((scm_t_uintptr) SCM_RTL_PROGRAM_CODE (program));
}
#undef FUNC_NAME

SCM
scm_i_rtl_program_name (SCM program)
{
  static SCM rtl_program_name = SCM_BOOL_F;

  if (SCM_PRIMITIVE_P (program))
    return SCM_SUBR_NAME (program);

  if (scm_is_false (rtl_program_name) && scm_module_system_booted_p)
    rtl_program_name =
        scm_c_private_variable ("system vm program", "rtl-program-name");

  return scm_call_1 (scm_variable_ref (rtl_program_name), program);
}

SCM
scm_i_rtl_program_documentation (SCM program)
{
  static SCM rtl_program_documentation = SCM_BOOL_F;

  if (SCM_PRIMITIVE_P (program))
    return SCM_BOOL_F;

  if (scm_is_false (rtl_program_documentation) && scm_module_system_booted_p)
    rtl_program_documentation =
      scm_c_private_variable ("system vm program",
                              "rtl-program-documentation");

  return scm_call_1 (scm_variable_ref (rtl_program_documentation), program);
}

SCM
scm_i_rtl_program_properties (SCM program)
{
  static SCM rtl_program_properties = SCM_BOOL_F;

  if (SCM_PRIMITIVE_P (program))
    {
      SCM name = scm_i_rtl_program_name (program);
      if (scm_is_false (name))
        return SCM_EOL;
      return scm_acons (scm_sym_name, name, SCM_EOL);
    }

  if (scm_is_false (rtl_program_properties) && scm_module_system_booted_p)
    rtl_program_properties =
      scm_c_private_variable ("system vm program", "rtl-program-properties");

  return scm_call_1 (scm_variable_ref (rtl_program_properties), program);
}

void
scm_i_program_print (SCM program, SCM port, scm_print_state *pstate)
{
  static int print_error = 0;

  if (scm_is_false (write_program) && scm_module_system_booted_p)
    write_program = scm_c_private_variable ("system vm program",
                                            "write-program");
  
  if (SCM_PROGRAM_IS_CONTINUATION (program))
    {
      /* twingliness */
      scm_puts_unlocked ("#<continuation ", port);
      scm_uintprint (SCM_UNPACK (program), 16, port);
      scm_putc_unlocked ('>', port);
    }
  else if (SCM_PROGRAM_IS_PARTIAL_CONTINUATION (program))
    {
      /* twingliness */
      scm_puts_unlocked ("#<partial-continuation ", port);
      scm_uintprint (SCM_UNPACK (program), 16, port);
      scm_putc_unlocked ('>', port);
    }
  else if (scm_is_false (write_program) || print_error)
    {
      scm_puts_unlocked ("#<rtl-program ", port);
      scm_uintprint (SCM_UNPACK (program), 16, port);
      scm_putc_unlocked (' ', port);
      scm_uintprint ((scm_t_uintptr) SCM_RTL_PROGRAM_CODE (program), 16, port);
      scm_putc_unlocked ('>', port);
    }
  else
    {
      print_error = 1;
      scm_call_2 (SCM_VARIABLE_REF (write_program), program, port);
      print_error = 0;
    }
}


/*
 * Scheme interface
 */

SCM_DEFINE (scm_rtl_program_p, "rtl-program?", 1, 0, 0,
	    (SCM obj),
	    "")
#define FUNC_NAME s_scm_rtl_program_p
{
  return scm_from_bool (SCM_RTL_PROGRAM_P (obj));
}
#undef FUNC_NAME

SCM_DEFINE (scm_primitive_p, "primitive?", 1, 0, 0,
	    (SCM obj),
	    "")
#define FUNC_NAME s_scm_primitive_p
{
  return scm_from_bool (SCM_PRIMITIVE_P (obj));
}
#undef FUNC_NAME

SCM_DEFINE (scm_primitive_call_ip, "primitive-call-ip", 1, 0, 0,
	    (SCM prim),
	    "")
#define FUNC_NAME s_scm_primitive_p
{
  SCM_MAKE_VALIDATE (1, prim, PRIMITIVE_P);

  return scm_from_uintptr_t (scm_i_primitive_call_ip (prim));
}
#undef FUNC_NAME

SCM
scm_find_source_for_addr (SCM ip)
{
  static SCM source_for_addr = SCM_BOOL_F;

  if (scm_is_false (source_for_addr)) {
    if (!scm_module_system_booted_p)
      return SCM_BOOL_F;

    source_for_addr =
      scm_c_private_variable ("system vm program", "source-for-addr");
  }

  return scm_call_1 (scm_variable_ref (source_for_addr), ip);
}

SCM
scm_program_source (SCM program, SCM ip, SCM sources)
{
  static SCM program_source = SCM_BOOL_F;

  if (scm_is_false (program_source)) {
    if (!scm_module_system_booted_p)
      return SCM_BOOL_F;

    program_source =
      scm_c_private_variable ("system vm program", "program-source");
  }

  if (SCM_UNBNDP (sources))
    return scm_call_2 (scm_variable_ref (program_source), program, ip);
  else
    return scm_call_3 (scm_variable_ref (program_source), program, ip, sources);
}
    
SCM_DEFINE (scm_program_num_free_variables, "program-num-free-variables", 1, 0, 0,
	    (SCM program),
	    "")
#define FUNC_NAME s_scm_program_num_free_variables
{
  SCM_VALIDATE_RTL_PROGRAM (1, program);

  return scm_from_ulong (SCM_RTL_PROGRAM_NUM_FREE_VARIABLES (program));
}
#undef FUNC_NAME

SCM_DEFINE (scm_program_free_variable_ref, "program-free-variable-ref", 2, 0, 0,
	    (SCM program, SCM i),
	    "")
#define FUNC_NAME s_scm_program_free_variable_ref
{
  unsigned long idx;

  SCM_VALIDATE_RTL_PROGRAM (1, program);
  SCM_VALIDATE_ULONG_COPY (2, i, idx);
  if (idx >= SCM_RTL_PROGRAM_NUM_FREE_VARIABLES (program))
    SCM_OUT_OF_RANGE (2, i);
  return SCM_RTL_PROGRAM_FREE_VARIABLE_REF (program, idx);
}
#undef FUNC_NAME

SCM_DEFINE (scm_program_free_variable_set_x, "program-free-variable-set!", 3, 0, 0,
	    (SCM program, SCM i, SCM x),
	    "")
#define FUNC_NAME s_scm_program_free_variable_set_x
{
  unsigned long idx;

  SCM_VALIDATE_RTL_PROGRAM (1, program);
  SCM_VALIDATE_ULONG_COPY (2, i, idx);
  if (idx >= SCM_RTL_PROGRAM_NUM_FREE_VARIABLES (program))
    SCM_OUT_OF_RANGE (2, i);
  SCM_RTL_PROGRAM_FREE_VARIABLE_SET (program, idx, x);
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME

int
scm_i_program_arity (SCM program, int *req, int *opt, int *rest)
{
  static SCM rtl_program_minimum_arity = SCM_BOOL_F;
  SCM l;

  if (SCM_PRIMITIVE_P (program))
    return scm_i_primitive_arity (program, req, opt, rest);

  if (SCM_PROGRAM_IS_FOREIGN (program))
    return scm_i_foreign_arity (program, req, opt, rest);

  if (SCM_PROGRAM_IS_CONTINUATION (program)
      || SCM_PROGRAM_IS_PARTIAL_CONTINUATION (program))
    {
      *req = *opt = 0;
      *rest = 1;
      return 1;
    }

  if (scm_is_false (rtl_program_minimum_arity) && scm_module_system_booted_p)
    rtl_program_minimum_arity =
        scm_c_private_variable ("system vm program",
                                "rtl-program-minimum-arity");

  l = scm_call_1 (scm_variable_ref (rtl_program_minimum_arity), program);
  if (scm_is_false (l))
    return 0;

  *req = scm_to_int (scm_car (l));
  *opt = scm_to_int (scm_cadr (l));
  *rest = scm_is_true (scm_caddr (l));

  return 1;
}



void
scm_bootstrap_programs (void)
{
  scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
                            "scm_init_programs",
                            (scm_t_extension_init_func)scm_init_programs, NULL);
}

void
scm_init_programs (void)
{
#ifndef SCM_MAGIC_SNARFER
#include "libguile/programs.x"
#endif
}

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/