/* Copyright 2001,2009-2014,2018,2025
     Free Software Foundation, Inc.

   This file is part of Guile.

   Guile 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.

   Guile 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 Guile.  If not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _SCM_PROGRAMS_H_
#define _SCM_PROGRAMS_H_

#include <libguile/gc.h>

/*
 * Programs
 */

struct scm_program
{
  scm_t_bits tag_flags_and_free_variable_count;
  const uint32_t *code;
  SCM free_variables[];
};

static inline int
scm_is_program (SCM x)
{
  return SCM_HAS_TYP7 (x, scm_tc7_program);
}

static inline struct scm_program*
scm_to_program (SCM x)
{
  if (!scm_is_program (x))
    abort ();
  return (struct scm_program*) SCM_UNPACK_POINTER (x);
}

static inline SCM
scm_from_program (struct scm_program *program)
{
  return SCM_PACK_POINTER (program);
}

enum scm_program_flags
  {
    SCM_F_PROGRAM_IS_BOOT = 0x100,
    SCM_F_PROGRAM_IS_PRIMITIVE = 0x200,
    SCM_F_PROGRAM_IS_PRIMITIVE_GENERIC = 0x400,
    SCM_F_PROGRAM_IS_CONTINUATION = 0x800,
    SCM_F_PROGRAM_IS_PARTIAL_CONTINUATION = 0x1000,
    SCM_F_PROGRAM_IS_FOREIGN = 0x2000
  };

static inline scm_t_bits
scm_program_flags (struct scm_program *program)
{
  return program->tag_flags_and_free_variable_count & 0xff00;
}

static inline int
scm_program_is_boot (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_BOOT;
}
static inline int
scm_program_is_primitive (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_PRIMITIVE;
}
static inline int
scm_program_is_primitive_generic (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_PRIMITIVE_GENERIC;
}
static inline int
scm_program_is_continuation (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_CONTINUATION;
}
static inline int
scm_program_is_partial_continuation (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_PARTIAL_CONTINUATION;
}
static inline int
scm_program_is_foreign (struct scm_program *program)
{
  return scm_program_flags (program) & SCM_F_PROGRAM_IS_FOREIGN;
}

static inline const uint32_t*
scm_program_code (struct scm_program *program)
{
  return program->code;
}

static inline size_t
scm_program_free_variable_count (struct scm_program *program)
{
  return program->tag_flags_and_free_variable_count >> 16;
}
static inline SCM
scm_program_free_variable_ref (struct scm_program *program, size_t idx)
{
  return program->free_variables[idx];
}
static inline void
scm_program_free_variable_set_x (struct scm_program *program, size_t idx, SCM v)
{
  program->free_variables[idx] = v;
}

static inline SCM
scm_i_make_program (const uint32_t *code)
{
  struct scm_program *ret =
    scm_gc_malloc_pointerless (sizeof (struct scm_program), "program");
  ret->tag_flags_and_free_variable_count = scm_tc7_program;
  ret->code = code;
  return scm_from_program (ret);
}

SCM_INTERNAL SCM scm_i_program_name (SCM program);
SCM_INTERNAL SCM scm_i_program_documentation (SCM program);
SCM_INTERNAL SCM scm_i_program_properties (SCM program);

SCM_INTERNAL SCM scm_find_source_for_addr (SCM ip);
SCM_INTERNAL SCM scm_program_address_range (SCM program);

SCM_INTERNAL int scm_i_program_arity (SCM program, int *req, int *opt, int *rest);
SCM_INTERNAL void scm_i_program_print (SCM program, SCM port,
                                       scm_print_state *pstate);
SCM_INTERNAL void scm_bootstrap_programs (void);
SCM_INTERNAL void scm_init_programs (void);

#endif /* _SCM_PROGRAMS_H_ */