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/* 
|| This file is part of Pike. For copyright information see COPYRIGHT. 
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING 
|| for more information. 
|| $Id: bignum.c,v 1.45 2008/05/30 15:19:02 mast Exp $ 
*/ 
 
#include "global.h" 
 
#ifdef AUTO_BIGNUM 
 
#include "interpret.h" 
#include "program.h" 
#include "object.h" 
#include "svalue.h" 
#include "pike_error.h" 
 
#define sp Pike_sp 
 
PMOD_EXPORT struct svalue auto_bignum_program = SVALUE_INIT_FREE; 
 
PMOD_EXPORT struct program *get_auto_bignum_program(void) 
{ 
  return program_from_function(&auto_bignum_program); 
} 
 
PMOD_EXPORT struct program *get_auto_bignum_program_or_zero(void) 
{ 
  if (auto_bignum_program.type == PIKE_T_FREE) 
    return 0; 
  return program_from_function(&auto_bignum_program); 
} 
 
void exit_auto_bignum(void) 
{ 
  free_svalue(&auto_bignum_program); 
  mark_free_svalue (&auto_bignum_program); 
} 
 
PMOD_EXPORT void convert_stack_top_to_bignum(void) 
{ 
  apply_svalue(&auto_bignum_program, 1); 
 
  if(sp[-1].type != T_OBJECT) { 
     if (auto_bignum_program.type!=T_PROGRAM) 
        Pike_error("Gmp.mpz conversion failed (Gmp.bignum not loaded).\n"); 
     else 
        Pike_error("Gmp.mpz conversion failed (unknown error).\n"); 
  } 
} 
 
PMOD_EXPORT void convert_stack_top_with_base_to_bignum(void) 
{ 
  apply_svalue(&auto_bignum_program, 2); 
 
  if(sp[-1].type != T_OBJECT) { 
     if (auto_bignum_program.type!=T_PROGRAM) 
        Pike_error("Gmp.mpz conversion failed (Gmp.bignum not loaded).\n"); 
     else 
        Pike_error("Gmp.mpz conversion failed (unknown error).\n"); 
  } 
} 
 
int is_bignum_object(struct object *o) 
{ 
  /* Note: 
   * This function should *NOT* try to resolv Gmp.mpz unless 
   * it is already loaded into memory. 
   * /Hubbe 
   */ 
 
  if (auto_bignum_program.type == T_INT) 
    return 0; /* not possible */ 
  
  return o->prog == program_from_svalue(&auto_bignum_program); 
} 
 
PMOD_EXPORT int is_bignum_object_in_svalue(struct svalue *sv) 
{ 
  /* FIXME: object subtype? */ 
  return sv->type == T_OBJECT && is_bignum_object(sv->u.object); 
} 
 
PMOD_EXPORT struct object *make_bignum_object(void) 
{ 
  convert_stack_top_to_bignum(); 
  dmalloc_touch_svalue(sp-1); 
  return (--sp)->u.object; 
} 
 
PMOD_EXPORT struct object *bignum_from_svalue(struct svalue *s) 
{ 
  push_svalue(s); 
  convert_stack_top_to_bignum(); 
  dmalloc_touch_svalue(sp-1); 
  return (--sp)->u.object; 
} 
 
PMOD_EXPORT struct pike_string *string_from_bignum(struct object *o, int base) 
{ 
  push_int(base); 
  safe_apply(o, "digits", 1); 
   
  if(sp[-1].type != T_STRING) 
    Pike_error("Gmp.mpz string conversion failed.\n"); 
   
  dmalloc_touch_svalue(sp-1); 
  return (--sp)->u.string; 
} 
 
PMOD_EXPORT void convert_svalue_to_bignum(struct svalue *s) 
{ 
  push_svalue(s); 
  convert_stack_top_to_bignum(); 
  free_svalue(s); 
  *s=sp[-1]; 
  sp--; 
  dmalloc_touch_svalue(sp); 
} 
 
#ifdef INT64 
static void bootstrap_push_int64 (INT64 i) 
{ 
  if(i == DO_NOT_WARN((INT_TYPE)i)) 
  { 
    push_int(DO_NOT_WARN((INT_TYPE)i)); 
  } 
  else 
    Pike_fatal ("Failed to convert large integer (Gmp.bignum not loaded).\n"); 
} 
 
PMOD_EXPORT void (*push_int64) (INT64) = bootstrap_push_int64; 
PMOD_EXPORT int (*int64_from_bignum) (INT64 *, struct object *) = NULL; 
PMOD_EXPORT void (*reduce_stack_top_bignum) (void) = NULL; 
#endif 
 
PMOD_EXPORT void (*push_ulongest) (unsigned LONGEST) = NULL; 
PMOD_EXPORT int (*ulongest_from_bignum) (unsigned LONGEST *, 
                                         struct object *) = NULL; 
 
PMOD_EXPORT void hook_in_gmp_funcs ( 
#ifdef INT64 
  void (*push_int64_val)(INT64), 
  int (*int64_from_bignum_val) (INT64 *, struct object *), 
  void (*reduce_stack_top_bignum_val) (void), 
#endif 
  void (*push_ulongest_val) (unsigned LONGEST), 
  int (*ulongest_from_bignum_val) (unsigned LONGEST *, struct object *)) 
{ 
  /* Assigning the pointers above directly from the Gmp module doesn't 
   * work in some cases, e.g. NT. */ 
#ifdef INT64 
  push_int64 = push_int64_val ? push_int64_val : bootstrap_push_int64; 
  int64_from_bignum = int64_from_bignum_val; 
  reduce_stack_top_bignum = reduce_stack_top_bignum_val; 
#endif 
  push_ulongest = push_ulongest_val; 
  ulongest_from_bignum = ulongest_from_bignum_val; 
} 
 
#endif /* AUTO_BIGNUM */