aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/beam/erl_nif.c
blob: 61dba4ef823e525b9c08158226cb6965937fc869 (plain) (tree)
1
2
3
4
5
6
7
8
9
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138

                   
  
                                                        
  


                                                                   
  






                                                                           
  
















                          
                    
                    
                             
                           
                        
                           


                                                                                 

                   













                                                                             
                                                                                

  









                                                                            



                                                  
                    
                                            
      
 
                            
                                                                         







                                                                   
                                           

 

                                                                        

                                        

                                                     

          

                                                                        
     
                                                            
                                     


                                                                   


              









                                                                      
                                                                             
 
                           


                                


                                             
                              








                                                                          
                                             


                             


                                                             


                                         
                            


                    






                                                           




                                            







                                                        


                                                                        












                                                                 
                                     

                                 






                                                        


                                                                        


     
                                                          
  
                                     
 
                                     






                                                        
                                                                  
                                                                       

     


                                    

 
                             



                                                       
                                          



                                                       
                         



                                   















                                                                              
                                     






                                                     
                                                     













                                                     
                     







                                                                              
                                             











                                                  
                       







                                                                                  
                    

                                 
                                                 


                        
                                         







                                           
                                                                        


         


                                                       
                                                                          
                     
                                                          

                 




















                                                                        
     



                                                         
                                                             




                                           
                               





                       






















                                                                   



                                                                      








                                                                                  


                                                               
      





                                           
                             




                                                           

                                                        
                                           

               
 

                                                                         













                                                                            

 



                                                   




                                                              
 



















                                                         




                                                  









                                                    

                                                        
                                                          

 




                                                     




                                                    

                                                           
                                                                     
 


                                                                          
                                                                                   



                                   











                                                                        
                 
                                                                                    
                                                                                   


                            
                        
                                     



                                           


                                      
                                                   


             

                                                      
                                    




                                                                                
                            
                   









                                                                     
                                      

                 



                                                                     







                                           
                                                    
                                                   

             
 
                                                     






                                                                    
                                     



                                                    



                          
                                                       
 








                                                               





                                                        

                                                                

                                                 



             
                                           
 
                               
                                      





                                                       
                     
                                  



                        
                                                                

                                                        
                   
                                               
                   


                                
























                                                              




                                                     


                            
                            
 





                                                                    


                   

                                                                       


                                          
 
                                                         
 

                              
     
                                 

                       

                      

 
                                           



                       
                                      
 








                               

 
                                                                              










                            































                                                                               

                                                         
                                         

                             
                                    

                                    
                       




                                                        

                                                                



                                             
                                                                 








                                                  
                       
                                                                    
                       
                             


     
                                                                 
                                                   



                                       
            






                                      
      












                                                                    
                                      
 




                                                               
                              

                                    

 
                                                                    
 
                                                  
                                    
     


                                 

                                                                      

             
                                       
                                      


                                  

                                                          

                 








                                                                      
 


                                                     
                                    
                                         

                                              










                                                                

                                                           
                                   
                                         

                                             










                                                       
                                    
                                  

                                    






                                      




                                

                                                                 
                                    
                                  

                                    




                                       
                                

               




                                












                                                                        









                             

                                                                   

             
                                  

                                    



                               


             









                                                                            

                                                                   






                                                   


             

                                                 
                                   
                                                                            

                                             



                         
                                                       
 
                                   
                                                                             

                                              





                                                   


                             
                                    
                                              

                                            



                                           
 
 

                                                             


                             
                                    
                                            

                                            



                                               

 



















                                                             

                                                       
              
               
 
                          

                                           



                          


                                                             




                                                                             

                                     
                                                                    

 

                                                                                 
 
                                                                               


                                                                             
                                                                                
 
                                       

                                  
                                                                
 















                                                               












                                                                                               











                                                                      


















                                          
     

 


















                                                                                              







                                                                           
                                       
                                                  

 





                                                
                                                         
 

                                     
 
                                                                                   
                                   





                       
              






                                 
                                          

                            
                


             



















































                                                                                   












































                                                                                       
































                                                                                                                      
                                                                                                                    
 



















                                                                            















                                                             
 





                                                                                                 

                 









                                                


                    
      
 




                                                                                               
 
                                                                       





                                        
                                                           






                                   
                                                       













                                                           

                                         
                       

 
                                                         
 



                                                       
                              
                                                              
 


                                               
                              

                                       
 
 












                                                                          
                   





                                                   
 



                                    
                                                




                                                     


                                             
                                                                   

                                     
                                           
                                   





                                   


          
                                          






                                     






                                                                                     






                        












































                                                                    

                                          
                                                                                    











                                                                 
                                         


                                        
 
 
                                                                
 



                                                                         

                                                                                      








                                            
                                     

                                                     
                                                                   



                                                                 
      




                                                       


                                                     
                                                                   







                                                                 


                                                          
                                                                   



                                                                         









                                                                     


                                                                                  
                




                                           




                                                                            
                                                                     







                                                             
                                      

                                                     

                                                                                   
 
 






                                                                        
                                                                        




























                                                                                           












                                                                 
 



                                                                     






                                                                           
   

                                                                            


                             

                       
                         
                   

                      
            
 


                                                                   


                                                                           




                                                                     
                                                                 

             

                                   








                                                        
 
                  
                 
          
 
                                                   
                                                       
                                     

                             

                                               
     
                                              
                                                   
              

 











                                                               







                                                                           
                   

                                                                                     
 







                                                          
                                                     
                                                                
                               

                    






                                           


                                
                                      















                                                   
                       
                         

 








                                                                        
 




                                            
                                      


                                     
 



















                                                                           
                                  
















                                                                         
                                 

                                     
                                                     






















                                                                                                                

                                                                                
                                    
 














                                                                                           
                                                        
                                    



                                                                                    
                                 












                                                                                  
 

                              


                                                      
 
                                                                                    



                                                  
                                                 






                                                                 
                                                 



                                                                                  
 


























                                                                            
                                   











                                                                           
                                                         
                  


            


                                                                            
 
                              


                                       
 




                                                  
 













                                                                                         
     
                                     
      


                                                                                  
 


                                                          


                  

                                      





                                                              

                                            



                                                  
                        

 
                                                                      
 



                                              

                 



                                   




                                              
                                                        
              
                  


                             
                           
                                        


                   
                            







                                     
                          












                                                            
                     
                       

                 





                                  

 






                                        
                          














                                                                   
                          












                                                            

                                                     


                        

                                                                                     







                                                        


                                                                     



                                   






                                                                                    
                                            



                                                                                  
                                           










                                                                                  
      
            
                              
      




                                                                       






                                                       


                              



                                                                      









                                                                          



                                                                      









                                                                          




                                                                   




















                                                                              
     



                                                                   




















                                                                              
     






                                                       


















                                                                                                                               



             




                                                                             
                                                                                      
 
                                          

                             
                                                                  
                                                                       


                                                   
                                                         




                











































                                                       











                                                                     
















                                                                                  

                                                                             










                                   




























                                                                                          




                                            
                          
                        
                           

                              
                         

                   
                          
                 
                      


                                                        
                                      
                           
 






                                                                                         

                                                                                
                    

                                 
 
                                                       




                                                     

                                                          
                                  









                                               
                                                         

                        
                                             
                                                                                     


                          

                                                                         



                                                                            
                                 
                                                                                        






                                                                                                     
     

                                                                                            







                                                                               



                                                                      
                                                                                 


                                                                                                       






                                                                             
                                                                  




                                                                                  




                                                                                              
                                                               
                                
                                                                                           
                                                                                         

                                                                                 























                                                                                                                     
                                                                                 

                                                                       

                                                            

                                             








                                    






                                                                    
                                   
                   
                      





                                                                              

                             
                                                  
 
                                             




                                                                                           
                                               
                                                                

                                         
                                                     

                                                                  

                          
                                               






                                                                             

                                                                            

                                                               




                                                                                     
                                              

                                                                           
                               


          
                              
                                                                              
                                                          



                                                                                                   
                                           
                                                                                              

                                
                                                        

                                                                                           

                                                  
         
                                                                            

                                                                 



                                                                                       

                                                  





                                                              




                                     

                                               
                                
                                                                                       
                                                                          
 
                                   
                                                                

                                                                             


                                                                    












                                                                              
                                            
                                           

         
          
          
                                         
                             


                                           
                                                            




                                           
                                    
                                                   
                                         
                                        








                                                                               


                 





                                           
                                                
                        
                             




























                                                        
                                       



                   

                                                                                         



                                                  

                                              

 












































                                                                                
                    

                                                         
                                                      
 
      
 














                                                                               

                                                                                   
                                                                               
                                   















                                                                            
                                        











                                                                



















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                    
/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 2009-2016. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * %CopyrightEnd%
 */
/* Erlang Native InterFace
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include "erl_nif.h"

#include "sys.h"
#include "global.h"
#include "erl_binary.h"
#include "bif.h"
#include "error.h"
#include "big.h"
#include "erl_map.h"
#include "beam_bp.h"
#include "erl_thr_progress.h"
#include "dtrace-wrapper.h"
#include "erl_process.h"
#include "erl_bif_unique.h"
#if defined(USE_DYNAMIC_TRACE) && (defined(USE_DTRACE) || defined(USE_SYSTEMTAP))
#define HAVE_USE_DTRACE 1
#endif

#include <limits.h>
#include <stddef.h> /* offsetof */


/* Information about a loaded nif library.
 * Each successful call to erlang:load_nif will allocate an instance of
 * erl_module_nif. Two calls opening the same library will thus have the same
 * 'handle'.
 */
struct erl_module_nif {
    void* priv_data;
    void* handle;             /* "dlopen" */
    struct enif_entry_t* entry;
    erts_refc_t rt_cnt;       /* number of resource types */
    erts_refc_t rt_dtor_cnt;  /* number of resource types with destructors */
    Module* mod;           /* Can be NULL if orphan with dtor-resources left */ 
};

#ifdef DEBUG
#  define READONLY_CHECK
#endif
#ifdef READONLY_CHECK
#  define ADD_READONLY_CHECK(ENV,PTR,SIZE) add_readonly_check(ENV,PTR,SIZE)
static void add_readonly_check(ErlNifEnv*, unsigned char* ptr, unsigned sz);
#else
#  define ADD_READONLY_CHECK(ENV,PTR,SIZE) ((void)0)
#endif

#ifdef DEBUG
static int is_offheap(const ErlOffHeap* off_heap);
#endif

#ifdef USE_VM_PROBES
void dtrace_nifenv_str(ErlNifEnv *, char *);
#endif

#define MIN_HEAP_FRAG_SZ 200
static Eterm* alloc_heap_heavy(ErlNifEnv* env, unsigned need, Eterm* hp);

static ERTS_INLINE Eterm* alloc_heap(ErlNifEnv* env, unsigned need)
{
    Eterm* hp = env->hp;
    env->hp += need;
    if (env->hp <= env->hp_end) {
	return hp;
    }
    return alloc_heap_heavy(env, need, hp);
}

static Eterm* alloc_heap_heavy(ErlNifEnv* env, unsigned need, Eterm* hp)
{    
    env->hp = hp;
    if (env->heap_frag == NULL) {       
	ASSERT(HEAP_LIMIT(env->proc) == env->hp_end);
	HEAP_TOP(env->proc) = env->hp;	
    }
    else {
	env->heap_frag->used_size = hp - env->heap_frag->mem;
	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
    }
    hp = erts_heap_alloc(env->proc, need, MIN_HEAP_FRAG_SZ);
    env->heap_frag = MBUF(env->proc);
    env->hp = hp + need;
    env->hp_end = env->heap_frag->mem + env->heap_frag->alloc_size;

    return hp;
}

#if SIZEOF_LONG != ERTS_SIZEOF_ETERM
static ERTS_INLINE void ensure_heap(ErlNifEnv* env, unsigned may_need)
{
    if (env->hp + may_need > env->hp_end) {
	alloc_heap_heavy(env, may_need, env->hp);
	env->hp -= may_need;
    }
}
#endif

void erts_pre_nif(ErlNifEnv* env, Process* p, struct erl_module_nif* mod_nif)
{
    env->mod_nif = mod_nif;
    env->proc = p;
    env->hp = HEAP_TOP(p);
    env->hp_end = HEAP_LIMIT(p);
    env->heap_frag = NULL;
    env->fpe_was_unmasked = erts_block_fpe();
    env->tmp_obj_list = NULL;
    env->exception_thrown = 0;
}

static void pre_nif_noproc(ErlNifEnv* env, struct erl_module_nif* mod_nif)
{
    env->mod_nif = mod_nif;
    env->proc = NULL;
    env->hp = NULL;
    env->hp_end = NULL;
    env->heap_frag = NULL;
    env->fpe_was_unmasked = erts_block_fpe();
    env->tmp_obj_list = NULL;
}

/* Temporary object header, auto-deallocated when NIF returns
 * or when independent environment is cleared.
 */
struct enif_tmp_obj_t {
    struct enif_tmp_obj_t* next;
    void (*dtor)(struct enif_tmp_obj_t*);
    ErtsAlcType_t allocator;
    /*char data[];*/
};

static ERTS_INLINE void free_tmp_objs(ErlNifEnv* env)
{
    while (env->tmp_obj_list != NULL) {
	struct enif_tmp_obj_t* free_me = env->tmp_obj_list;
	env->tmp_obj_list = free_me->next;
	free_me->dtor(free_me);
    }
}

void erts_post_nif(ErlNifEnv* env)
{
    erts_unblock_fpe(env->fpe_was_unmasked);
    if (env->heap_frag == NULL) {
	ASSERT(env->hp_end == HEAP_LIMIT(env->proc));
	ASSERT(env->hp >= HEAP_TOP(env->proc));
	ASSERT(env->hp <= HEAP_LIMIT(env->proc));	
	HEAP_TOP(env->proc) = env->hp;
    }
    else {
	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);
	env->heap_frag->used_size = env->hp - env->heap_frag->mem;
	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
    }
    free_tmp_objs(env);
}

static void post_nif_noproc(ErlNifEnv* env)
{
    erts_unblock_fpe(env->fpe_was_unmasked);
    free_tmp_objs(env);
}


/* Flush out our cached heap pointers to allow an ordinary HAlloc
*/
static void flush_env(ErlNifEnv* env)
{
    if (env->heap_frag == NULL) {
	ASSERT(env->hp_end == HEAP_LIMIT(env->proc));
	ASSERT(env->hp >= HEAP_TOP(env->proc));
	ASSERT(env->hp <= HEAP_LIMIT(env->proc));	
	HEAP_TOP(env->proc) = env->hp;
    }
    else {
	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);
	env->heap_frag->used_size = env->hp - env->heap_frag->mem;
	ASSERT(env->heap_frag->used_size <= env->heap_frag->alloc_size);
    }
}

/* Restore cached heap pointers to allow alloc_heap again.
*/
static void cache_env(ErlNifEnv* env)
{
    env->heap_frag = MBUF(env->proc);
    if (env->heap_frag == NULL) {
	ASSERT(env->hp_end == HEAP_LIMIT(env->proc));
	ASSERT(env->hp <= HEAP_TOP(env->proc));
	ASSERT(env->hp <= HEAP_LIMIT(env->proc));	
	env->hp = HEAP_TOP(env->proc);
    }
    else {
	env->hp = env->heap_frag->mem + env->heap_frag->used_size;
	env->hp_end = env->heap_frag->mem + env->heap_frag->alloc_size;
    }
}
void* enif_priv_data(ErlNifEnv* env)
{
    return env->mod_nif->priv_data;
}

void* enif_alloc(size_t size)
{
    return erts_alloc_fnf(ERTS_ALC_T_NIF, (Uint) size);
}

void* enif_realloc(void* ptr, size_t size)
{
    return erts_realloc_fnf(ERTS_ALC_T_NIF, ptr, size);
}

void enif_free(void* ptr)
{
    erts_free(ERTS_ALC_T_NIF, ptr);
}

struct enif_msg_environment_t
{
    ErlNifEnv env;
    Process phony_proc;
};

ErlNifEnv* enif_alloc_env(void)
{
    struct enif_msg_environment_t* msg_env =
	erts_alloc_fnf(ERTS_ALC_T_NIF, sizeof(struct enif_msg_environment_t));
    Eterm* phony_heap = (Eterm*) msg_env; /* dummy non-NULL ptr */
	
    msg_env->env.hp = phony_heap; 
    msg_env->env.hp_end = phony_heap;
    msg_env->env.heap_frag = NULL;
    msg_env->env.mod_nif = NULL;
    msg_env->env.tmp_obj_list = NULL;
    msg_env->env.proc = &msg_env->phony_proc;
    memset(&msg_env->phony_proc, 0, sizeof(Process));
    HEAP_START(&msg_env->phony_proc) = phony_heap;
    HEAP_TOP(&msg_env->phony_proc) = phony_heap;
    HEAP_LIMIT(&msg_env->phony_proc) = phony_heap;
    HEAP_END(&msg_env->phony_proc) = phony_heap;
    MBUF(&msg_env->phony_proc) = NULL;
    msg_env->phony_proc.common.id = ERTS_INVALID_PID;
#ifdef FORCE_HEAP_FRAGS
    msg_env->phony_proc.space_verified = 0;
    msg_env->phony_proc.space_verified_from = NULL;
#endif
    return &msg_env->env;
}
void enif_free_env(ErlNifEnv* env)
{
    enif_clear_env(env);
    erts_free(ERTS_ALC_T_NIF, env);
}

static ERTS_INLINE void clear_offheap(ErlOffHeap* oh)
{
    oh->first = NULL;
    oh->overhead = 0;
}

void enif_clear_env(ErlNifEnv* env)
{
    struct enif_msg_environment_t* menv = (struct enif_msg_environment_t*)env;
    Process* p = &menv->phony_proc;
    ASSERT(p == menv->env.proc);
    ASSERT(p->common.id == ERTS_INVALID_PID);
    ASSERT(MBUF(p) == menv->env.heap_frag);
    if (MBUF(p) != NULL) {
	erts_cleanup_offheap(&MSO(p));
	clear_offheap(&MSO(p));
	free_message_buffer(MBUF(p));
	MBUF(p) = NULL;
	menv->env.heap_frag = NULL;
    }
    ASSERT(HEAP_TOP(p) == HEAP_END(p));
    menv->env.hp = menv->env.hp_end = HEAP_TOP(p);
    
    ASSERT(!is_offheap(&MSO(p)));
    free_tmp_objs(env);
}
int enif_send(ErlNifEnv* env, const ErlNifPid* to_pid,
	      ErlNifEnv* msg_env, ERL_NIF_TERM msg)
{
    struct enif_msg_environment_t* menv = (struct enif_msg_environment_t*)msg_env;
    ErtsProcLocks rp_locks = 0;
    Process* rp;
    Process* c_p;
    ErtsMessage *mp;
    Eterm receiver = to_pid->pid;
    int flush_me = 0;
    int scheduler = erts_get_scheduler_id() != 0;

    if (env != NULL) {
	c_p = env->proc;
	if (receiver == c_p->common.id) {
	    rp_locks = ERTS_PROC_LOCK_MAIN;
	    flush_me = 1;
	}
    }
    else {
#ifdef ERTS_SMP
	c_p = NULL;
#else
	erts_exit(ERTS_ABORT_EXIT,"enif_send: env==NULL on non-SMP VM");
#endif
    }    

    rp = (scheduler
	  ? erts_proc_lookup(receiver)
	  : erts_pid2proc_opt(c_p, ERTS_PROC_LOCK_MAIN,
			      receiver, rp_locks, ERTS_P2P_FLG_INC_REFC));
    if (rp == NULL) {
	ASSERT(env == NULL || receiver != c_p->common.id);
	return 0;
    }
    if (menv) {
        flush_env(msg_env);
        mp = erts_alloc_message(0, NULL);
        mp->data.heap_frag = menv->env.heap_frag;
        ASSERT(mp->data.heap_frag == MBUF(&menv->phony_proc));
        if (mp->data.heap_frag != NULL) {
            /* Move all offheap's from phony proc to the first fragment.
               Quick and dirty... */
            ASSERT(!is_offheap(&mp->data.heap_frag->off_heap));
            mp->data.heap_frag->off_heap = MSO(&menv->phony_proc);
            clear_offheap(&MSO(&menv->phony_proc));
            menv->env.heap_frag = NULL;
            MBUF(&menv->phony_proc) = NULL;
        }
        ASSERT(!is_offheap(&MSO(&menv->phony_proc)));
    } else {
        Uint sz = size_object(msg);
        Eterm *hp;
        mp = erts_alloc_message(sz, &hp);
        msg = copy_struct(msg, sz, &hp, &mp->hfrag.off_heap);
        ASSERT(hp == mp->hfrag.mem+mp->hfrag.used_size);
    }

    if (flush_me) {	
	flush_env(env); /* Needed for ERTS_HOLE_CHECK */ 
    }
    erts_queue_message(rp, &rp_locks, mp, msg, am_undefined);
    if (c_p == rp)
	rp_locks &= ~ERTS_PROC_LOCK_MAIN;
    if (rp_locks)
	erts_smp_proc_unlock(rp, rp_locks);
    if (!scheduler)
	erts_proc_dec_refc(rp);
    if (flush_me) {
	cache_env(env);
    }
    return 1;
}

int
enif_port_command(ErlNifEnv *env, const ErlNifPort* to_port,
                  ErlNifEnv *msg_env, ERL_NIF_TERM msg)
{

    ErtsSchedulerData *esdp = erts_get_scheduler_data();
    int scheduler = esdp ? esdp->no : 0;
    Port *prt;

    if (scheduler == 0 || !env)
        return 0;

    prt = erts_port_lookup(to_port->port_id,
                           (erts_port_synchronous_ops
                            ? ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP
                            : ERTS_PORT_SFLGS_INVALID_LOOKUP));

    if (!prt)
        return 0;

    return erts_port_output_async(prt, env->proc->common.id, msg);
}

ERL_NIF_TERM enif_make_copy(ErlNifEnv* dst_env, ERL_NIF_TERM src_term)
{
    Uint sz;
    Eterm* hp;
#ifdef SHCOPY
    erts_shcopy_t info;
    INITIALIZE_SHCOPY(info);
    sz = copy_shared_calculate(src_term, &info);
    hp = alloc_heap(dst_env, sz);
    src_term = copy_shared_perform(src_term, sz, &info, &hp, &MSO(dst_env->proc));
    DESTROY_SHCOPY(info);
    return src_term;
#else
    sz = size_object(src_term);
    hp = alloc_heap(dst_env, sz);
    return copy_struct(src_term, sz, &hp, &MSO(dst_env->proc));
#endif
}


#ifdef DEBUG
static int is_offheap(const ErlOffHeap* oh)
{
    return oh->first != NULL;
}
#endif

ErlNifPid* enif_self(ErlNifEnv* caller_env, ErlNifPid* pid)
{
    if (caller_env->proc->common.id == ERTS_INVALID_PID)
        return NULL;
    pid->pid = caller_env->proc->common.id;
    return pid;
}

int enif_get_local_pid(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifPid* pid)
{
    if (is_internal_pid(term)) {
        pid->pid=term;
        return 1;
    }
    return 0;
}

int enif_get_local_port(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifPort* port)
{
    if (is_internal_port(term)) {
        port->port_id=term;
        return 1;
    }
    return 0;
}

int enif_is_atom(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_atom(term);
}

int enif_is_binary(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_binary(term) && (binary_bitsize(term) % 8 == 0);
}

int enif_is_empty_list(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_nil(term);
}

int enif_is_fun(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_fun(term);
}

int enif_is_pid(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_pid(term);
}

int enif_is_port(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_port(term);
}

int enif_is_ref(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_ref(term);
}

int enif_is_tuple(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_tuple(term);
}

int enif_is_list(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_list(term) || is_nil(term);
}

int enif_is_exception(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return env->exception_thrown && term == THE_NON_VALUE;
}

int enif_is_number(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_number(term);
}

static ERTS_INLINE int is_proc_bound(ErlNifEnv* env)
{
    return env->mod_nif != NULL;
}

static void aligned_binary_dtor(struct enif_tmp_obj_t* obj)
{
    erts_free_aligned_binary_bytes_extra((byte*)obj, obj->allocator);
}

int enif_inspect_binary(ErlNifEnv* env, Eterm bin_term, ErlNifBinary* bin)
{
    ErtsAlcType_t allocator = is_proc_bound(env) ? ERTS_ALC_T_TMP : ERTS_ALC_T_NIF;
    union {
	struct enif_tmp_obj_t* tmp;
	byte* raw_ptr;
    }u;

    if (is_boxed(bin_term) && *binary_val(bin_term) == HEADER_SUB_BIN) {
	ErlSubBin* sb = (ErlSubBin*) binary_val(bin_term);
	if (sb->is_writable) {
	    ProcBin* pb = (ProcBin*) binary_val(sb->orig);
	    ASSERT(pb->thing_word == HEADER_PROC_BIN);
	    if (pb->flags) {
		erts_emasculate_writable_binary(pb);
		sb->is_writable = 0;
	    }
	}
    }
    u.tmp = NULL;
    bin->data = erts_get_aligned_binary_bytes_extra(bin_term, &u.raw_ptr, allocator,
						    sizeof(struct enif_tmp_obj_t));
    if (bin->data == NULL) {
	return 0;
    }
    if (u.tmp != NULL) {
	u.tmp->allocator = allocator;
	u.tmp->next = env->tmp_obj_list;
	u.tmp->dtor = &aligned_binary_dtor;
	env->tmp_obj_list = u.tmp;
    }
    bin->bin_term = bin_term;
    bin->size = binary_size(bin_term);
    bin->ref_bin = NULL;
    ADD_READONLY_CHECK(env, bin->data, bin->size); 
    return 1;
}

static void tmp_alloc_dtor(struct enif_tmp_obj_t* obj)
{
    erts_free(obj->allocator,  obj);
}

int enif_inspect_iolist_as_binary(ErlNifEnv* env, Eterm term, ErlNifBinary* bin)
{
    struct enif_tmp_obj_t* tobj;
    ErtsAlcType_t allocator;
    ErlDrvSizeT sz;
    if (is_binary(term)) {
	return enif_inspect_binary(env,term,bin);
    }
    if (is_nil(term)) {
	bin->data = (unsigned char*) &bin->data; /* dummy non-NULL */
	bin->size = 0;
	bin->bin_term = THE_NON_VALUE;
	bin->ref_bin = NULL;
	return 1;
    }
    if (erts_iolist_size(term, &sz)) {
	return 0;
    }

    allocator = is_proc_bound(env) ? ERTS_ALC_T_TMP : ERTS_ALC_T_NIF;
    tobj = erts_alloc(allocator, sz + sizeof(struct enif_tmp_obj_t));
    tobj->allocator = allocator;
    tobj->next = env->tmp_obj_list;
    tobj->dtor = &tmp_alloc_dtor;
    env->tmp_obj_list = tobj;

    bin->data = (unsigned char*) &tobj[1]; 
    bin->size = sz;
    bin->bin_term = THE_NON_VALUE;
    bin->ref_bin = NULL;
    erts_iolist_to_buf(term, (char*) bin->data, sz);
    ADD_READONLY_CHECK(env, bin->data, bin->size); 
    return 1;
}

int enif_alloc_binary(size_t size, ErlNifBinary* bin)
{
    Binary* refbin;

    refbin = erts_bin_drv_alloc_fnf(size); /* BUGBUG: alloc type? */
    if (refbin == NULL) {
	return 0; /* The NIF must take action */
    }
    erts_refc_init(&refbin->refc, 1);

    bin->size = size;
    bin->data = (unsigned char*) refbin->orig_bytes;
    bin->bin_term = THE_NON_VALUE;
    bin->ref_bin = refbin;
    return 1;
}

int enif_realloc_binary(ErlNifBinary* bin, size_t size)
{
    if (bin->ref_bin != NULL) {
	Binary* oldbin;
	Binary* newbin;
    
	oldbin = (Binary*) bin->ref_bin; 
	newbin = (Binary *) erts_bin_realloc_fnf(oldbin, size);
	if (!newbin) {
	    return 0;
	}    
	bin->ref_bin = newbin;
	bin->data = (unsigned char*) newbin->orig_bytes;
	bin->size = size;
    }
    else {
	unsigned char* old_data = bin->data;
	size_t cpy_sz = (size < bin->size ? size : bin->size);  
	enif_alloc_binary(size, bin);
	sys_memcpy(bin->data, old_data, cpy_sz); 
    }
    return 1;
}


void enif_release_binary(ErlNifBinary* bin)
{
    if (bin->ref_bin != NULL) {
	Binary* refbin = bin->ref_bin;
	ASSERT(bin->bin_term == THE_NON_VALUE);
	if (erts_refc_dectest(&refbin->refc, 0) == 0) {
	    erts_bin_free(refbin);
	}
    }
#ifdef DEBUG
    bin->data = NULL;
    bin->bin_term = THE_NON_VALUE;
    bin->ref_bin = NULL;
#endif
}

unsigned char* enif_make_new_binary(ErlNifEnv* env, size_t size,
				    ERL_NIF_TERM* termp)
{
    flush_env(env);
    *termp = new_binary(env->proc, NULL, size);
    cache_env(env);
    return binary_bytes(*termp);
}

int enif_term_to_binary(ErlNifEnv *dst_env, ERL_NIF_TERM term,
                        ErlNifBinary *bin)
{
    Sint size;
    byte *bp;
    Binary* refbin;

    size = erts_encode_ext_size(term);
    if (!enif_alloc_binary(size, bin))
        return 0;

    refbin = bin->ref_bin;

    bp = bin->data;

    erts_encode_ext(term, &bp);

    bin->size = bp - bin->data;
    refbin->orig_size = bin->size;

    ASSERT(bin->data + bin->size == bp);

    return 1;
}

size_t enif_binary_to_term(ErlNifEnv *dst_env,
                           const unsigned char* data,
                           size_t data_sz,
                           ERL_NIF_TERM *term,
                           ErlNifBinaryToTerm opts)
{
    Sint size;
    ErtsHeapFactory factory;
    byte *bp = (byte*) data;

    ERTS_CT_ASSERT(ERL_NIF_BIN2TERM_SAFE == ERTS_DIST_EXT_BTT_SAFE);

    if (opts & ~ERL_NIF_BIN2TERM_SAFE) {
        return 0;
    }
    if ((size = erts_decode_ext_size(bp, data_sz)) < 0)
        return 0;

    if (size > 0) {
        flush_env(dst_env);
        erts_factory_proc_prealloc_init(&factory, dst_env->proc, size);
    } else {
        erts_factory_dummy_init(&factory);
    }

    *term = erts_decode_ext(&factory, &bp, (Uint32)opts);

    if (is_non_value(*term)) {
        return 0;
    }
    erts_factory_close(&factory);
    cache_env(dst_env);

    ASSERT(bp > data);
    return bp - data;
}

int enif_is_identical(Eterm lhs, Eterm rhs)
{
    return EQ(lhs,rhs);
}

int enif_compare(Eterm lhs, Eterm rhs)
{
    Sint result = CMP(lhs,rhs);

    if (result < 0) {
        return -1;
    } else if (result > 0) {
        return 1;
    }

    return result;
}

int enif_get_tuple(ErlNifEnv* env, Eterm tpl, int* arity, const Eterm** array)
{
    Eterm* ptr;
    if (is_not_tuple(tpl)) {
	return 0;
    }
    ptr = tuple_val(tpl);
    *arity = arityval(*ptr);
    *array = ptr+1;
    return 1;
}

int enif_get_string(ErlNifEnv *env, ERL_NIF_TERM list, char* buf, unsigned len,
		    ErlNifCharEncoding encoding)
{
    Eterm* listptr;
    int n = 0;

    ASSERT(encoding == ERL_NIF_LATIN1);
    if (len < 1) {
	return 0;
    }
    while (is_not_nil(list)) { 	    
	if (is_not_list(list)) {
	    buf[n] = '\0';
	    return 0;
	}
	listptr = list_val(list);
    
	if (!is_byte(*listptr)) {
	    buf[n] = '\0';
	    return 0;
	}
	buf[n++] = unsigned_val(*listptr);
	if (n >= len) {
	    buf[n-1] = '\0'; /* truncate */
	    return -len;
	}
	list = CDR(listptr);
    }
    buf[n] = '\0';
    return n + 1;
}

Eterm enif_make_binary(ErlNifEnv* env, ErlNifBinary* bin)
{
    if (bin->bin_term != THE_NON_VALUE) {
	return bin->bin_term;
    }
    else if (bin->ref_bin != NULL) {
	Binary* bptr = bin->ref_bin;
	ProcBin* pb;
	Eterm bin_term;
	
	/* !! Copy-paste from new_binary() !! */
	pb = (ProcBin *) alloc_heap(env, PROC_BIN_SIZE);
	pb->thing_word = HEADER_PROC_BIN;
	pb->size = bptr->orig_size;
	pb->next = MSO(env->proc).first;
	MSO(env->proc).first = (struct erl_off_heap_header*) pb;
	pb->val = bptr;
	pb->bytes = (byte*) bptr->orig_bytes;
	pb->flags = 0;
	
	OH_OVERHEAD(&(MSO(env->proc)), pb->size / sizeof(Eterm));
	bin_term = make_binary(pb);	
	if (erts_refc_read(&bptr->refc, 1) == 1) {
	    /* Total ownership transfer */
	    bin->ref_bin = NULL;
	    bin->bin_term = bin_term;
	}
	return bin_term;
    }
    else {
	flush_env(env);
	bin->bin_term = new_binary(env->proc, bin->data, bin->size);
	cache_env(env);
	return bin->bin_term;
    }
}

Eterm enif_make_sub_binary(ErlNifEnv* env, ERL_NIF_TERM bin_term,
			   size_t pos, size_t size)
{
    ErlSubBin* sb;
    Eterm orig;
    Uint offset, bit_offset, bit_size; 
#ifdef DEBUG
    unsigned src_size;

    ASSERT(is_binary(bin_term));
    src_size = binary_size(bin_term);
    ASSERT(pos <= src_size);
    ASSERT(size <= src_size);
    ASSERT(pos + size <= src_size);   
#endif
    sb = (ErlSubBin*) alloc_heap(env, ERL_SUB_BIN_SIZE);
    ERTS_GET_REAL_BIN(bin_term, orig, offset, bit_offset, bit_size);
    sb->thing_word = HEADER_SUB_BIN;
    sb->size = size;
    sb->offs = offset + pos;
    sb->orig = orig;
    sb->bitoffs = bit_offset;
    sb->bitsize = 0;
    sb->is_writable = 0;
    return make_binary(sb);
}


Eterm enif_make_badarg(ErlNifEnv* env)
{
    return enif_raise_exception(env, am_badarg);
}

Eterm enif_raise_exception(ErlNifEnv* env, ERL_NIF_TERM reason)
{
    env->exception_thrown = 1;
    env->proc->fvalue = reason;
    BIF_ERROR(env->proc, EXC_ERROR);
}

int enif_has_pending_exception(ErlNifEnv* env, ERL_NIF_TERM* reason)
{
    if (env->exception_thrown && reason != NULL) {
	*reason = env->proc->fvalue;
    }
    return env->exception_thrown;
}

int enif_get_atom(ErlNifEnv* env, Eterm atom, char* buf, unsigned len,
		  ErlNifCharEncoding encoding)
{
    Atom* ap;
    ASSERT(encoding == ERL_NIF_LATIN1);
    if (is_not_atom(atom) || len==0) {
	return 0;
    }
    ap = atom_tab(atom_val(atom));

    if (ap->latin1_chars < 0 || ap->latin1_chars >= len) {
	return 0;
    }
    if (ap->latin1_chars == ap->len) {
	sys_memcpy(buf, ap->name, ap->len);
    }
    else {
	int dlen = erts_utf8_to_latin1((byte*)buf, ap->name, ap->len);
	ASSERT(dlen == ap->latin1_chars); (void)dlen;
    }
    buf[ap->latin1_chars] = '\0';
    return ap->latin1_chars + 1;
}

int enif_get_int(ErlNifEnv* env, Eterm term, int* ip)
{
#if SIZEOF_INT ==  ERTS_SIZEOF_ETERM
    return term_to_Sint(term, (Sint*)ip);
#elif (SIZEOF_LONG ==  ERTS_SIZEOF_ETERM) || \
  (SIZEOF_LONG_LONG ==  ERTS_SIZEOF_ETERM)
    Sint i;
    if (!term_to_Sint(term, &i) || i < INT_MIN || i > INT_MAX) {
	return 0;
    }
    *ip = (int) i;
    return 1;
#else
#  error Unknown word size 
#endif     
}

int enif_get_uint(ErlNifEnv* env, Eterm term, unsigned* ip)
{
#if SIZEOF_INT == ERTS_SIZEOF_ETERM
    return term_to_Uint(term, (Uint*)ip);
#elif (SIZEOF_LONG == ERTS_SIZEOF_ETERM) || \
  (SIZEOF_LONG_LONG ==  ERTS_SIZEOF_ETERM)
    Uint i;
    if (!term_to_Uint(term, &i) || i > UINT_MAX) {
	return 0;
    }
    *ip = (unsigned) i;
    return 1;
#endif     
}

int enif_get_long(ErlNifEnv* env, Eterm term, long* ip)
{
#if SIZEOF_LONG == ERTS_SIZEOF_ETERM
    return term_to_Sint(term, ip);
#elif SIZEOF_LONG == 8
    return term_to_Sint64(term, ip);
#elif SIZEOF_LONG == SIZEOF_INT
    int tmp,ret;
    ret = enif_get_int(env,term,&tmp);
    if (ret) {
      *ip = (long) tmp;
    }
    return ret;
#else
#  error Unknown long word size 
#endif     
}

int enif_get_ulong(ErlNifEnv* env, Eterm term, unsigned long* ip)
{
#if SIZEOF_LONG == ERTS_SIZEOF_ETERM
    return term_to_Uint(term, ip);
#elif SIZEOF_LONG == 8
    return term_to_Uint64(term, ip);
#elif SIZEOF_LONG == SIZEOF_INT
    int ret;
    unsigned int tmp;
    ret = enif_get_uint(env,term,&tmp);
    if (ret) {
      *ip = (unsigned long) tmp;
    }
    return ret;
#else
#  error Unknown long word size 
#endif     
}

#if HAVE_INT64 && SIZEOF_LONG != 8
int enif_get_int64(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifSInt64* ip)
{
    return term_to_Sint64(term, ip);
}

int enif_get_uint64(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifUInt64* ip)
{
    return term_to_Uint64(term, ip);
}
#endif /* HAVE_INT64 && SIZEOF_LONG != 8 */

int enif_get_double(ErlNifEnv* env, ERL_NIF_TERM term, double* dp)
{
    FloatDef f;
    if (is_not_float(term)) {
	return 0;
    }
    GET_DOUBLE(term, f);
    *dp = f.fd;
    return 1;
}

int enif_get_atom_length(ErlNifEnv* env, Eterm atom, unsigned* len,
			 ErlNifCharEncoding enc)
{
    Atom* ap;
    ASSERT(enc == ERL_NIF_LATIN1);
    if (is_not_atom(atom)) return 0;
    ap = atom_tab(atom_val(atom));
    if (ap->latin1_chars < 0) {
	return 0;
    }
    *len = ap->latin1_chars;
    return 1;
}

int enif_get_list_cell(ErlNifEnv* env, Eterm term, Eterm* head, Eterm* tail)
{
    Eterm* val;
    if (is_not_list(term)) return 0;
    val = list_val(term);
    *head = CAR(val);
    *tail = CDR(val);
    return 1;
}

int enif_get_list_length(ErlNifEnv* env, Eterm term, unsigned* len)
{
    Sint i;
    Uint u;

    if ((i = erts_list_length(term)) < 0) return 0;
    u = (Uint)i;
    if ((unsigned)u != u) return 0;
    *len = u;
    return 1;
}

ERL_NIF_TERM enif_make_int(ErlNifEnv* env, int i)
{
#if SIZEOF_INT == ERTS_SIZEOF_ETERM
    return IS_SSMALL(i) ? make_small(i) : small_to_big(i,alloc_heap(env,2));
#elif (SIZEOF_LONG == ERTS_SIZEOF_ETERM) || \
  (SIZEOF_LONG_LONG == ERTS_SIZEOF_ETERM)
    return make_small(i);
#endif
}

ERL_NIF_TERM enif_make_uint(ErlNifEnv* env, unsigned i)
{
#if SIZEOF_INT == ERTS_SIZEOF_ETERM
    return IS_USMALL(0,i) ? make_small(i) : uint_to_big(i,alloc_heap(env,2));
#elif (SIZEOF_LONG ==  ERTS_SIZEOF_ETERM) || \
  (SIZEOF_LONG_LONG ==  ERTS_SIZEOF_ETERM)
    return make_small(i);
#endif
}

ERL_NIF_TERM enif_make_long(ErlNifEnv* env, long i)
{
    if (IS_SSMALL(i)) {
	return make_small(i);
    }
#if SIZEOF_LONG == ERTS_SIZEOF_ETERM
    return small_to_big(i, alloc_heap(env,2));
#elif SIZEOF_LONG_LONG ==  ERTS_SIZEOF_ETERM
    return make_small(i);
#elif SIZEOF_LONG == 8
    ensure_heap(env,3);
    return erts_sint64_to_big(i, &env->hp);
#endif
}

ERL_NIF_TERM enif_make_ulong(ErlNifEnv* env, unsigned long i)
{
    if (IS_USMALL(0,i)) {
	return make_small(i);
    }
#if SIZEOF_LONG == ERTS_SIZEOF_ETERM
    return uint_to_big(i,alloc_heap(env,2));
#elif SIZEOF_LONG_LONG ==  ERTS_SIZEOF_ETERM
    return make_small(i);
#elif SIZEOF_LONG == 8
    ensure_heap(env,3);
    return erts_uint64_to_big(i, &env->hp);    
#endif
}

#if HAVE_INT64 && SIZEOF_LONG != 8
ERL_NIF_TERM enif_make_int64(ErlNifEnv* env, ErlNifSInt64 i)
{
    Uint* hp;
    Uint need = 0;
    erts_bld_sint64(NULL, &need, i);
    hp = alloc_heap(env, need);
    return erts_bld_sint64(&hp, NULL, i);
}

ERL_NIF_TERM enif_make_uint64(ErlNifEnv* env, ErlNifUInt64 i)
{
    Uint* hp;
    Uint need = 0;
    erts_bld_uint64(NULL, &need, i);
    hp = alloc_heap(env, need);
    return erts_bld_uint64(&hp, NULL, i);
}
#endif /* HAVE_INT64 && SIZEOF_LONG != 8 */

ERL_NIF_TERM enif_make_double(ErlNifEnv* env, double d)
{
    Eterm* hp;
    FloatDef f;

    if (!erts_isfinite(d))
        return enif_make_badarg(env);
    hp = alloc_heap(env,FLOAT_SIZE_OBJECT);
    f.fd = d;
    PUT_DOUBLE(f, hp);
    return make_float(hp);
}

ERL_NIF_TERM enif_make_atom(ErlNifEnv* env, const char* name)
{
    return enif_make_atom_len(env, name, sys_strlen(name));
}

ERL_NIF_TERM enif_make_atom_len(ErlNifEnv* env, const char* name, size_t len)
{
    if (len > MAX_ATOM_CHARACTERS)
        return enif_make_badarg(env);
    return erts_atom_put((byte*)name, len, ERTS_ATOM_ENC_LATIN1, 1);
}

int enif_make_existing_atom(ErlNifEnv* env, const char* name, ERL_NIF_TERM* atom,
			    ErlNifCharEncoding enc)
{
    return enif_make_existing_atom_len(env, name, sys_strlen(name), atom, enc);
}

int enif_make_existing_atom_len(ErlNifEnv* env, const char* name, size_t len,
				ERL_NIF_TERM* atom, ErlNifCharEncoding encoding)
{
    ASSERT(encoding == ERL_NIF_LATIN1);
    if (len > MAX_ATOM_CHARACTERS)
        return 0;
    return erts_atom_get(name, len, atom, ERTS_ATOM_ENC_LATIN1);
}

ERL_NIF_TERM enif_make_tuple(ErlNifEnv* env, unsigned cnt, ...)
{
    Eterm* hp = alloc_heap(env,cnt+1);
    Eterm ret = make_tuple(hp);
    va_list ap;

    *hp++ = make_arityval(cnt);
    va_start(ap,cnt);
    while (cnt--) {
	*hp++ = va_arg(ap,Eterm);	   
    }
    va_end(ap);
    return ret;
}

ERL_NIF_TERM enif_make_tuple_from_array(ErlNifEnv* env, const ERL_NIF_TERM arr[], unsigned cnt)
{
    Eterm* hp = alloc_heap(env,cnt+1);
    Eterm ret = make_tuple(hp);
    const Eterm* src = arr;

    *hp++ = make_arityval(cnt);
    while (cnt--) {
	*hp++ = *src++;	   
    }
    return ret;
}

ERL_NIF_TERM enif_make_list_cell(ErlNifEnv* env, Eterm car, Eterm cdr)
{
    Eterm* hp = alloc_heap(env,2);
    Eterm ret = make_list(hp);

    CAR(hp) = car;
    CDR(hp) = cdr;
    return ret;
}

ERL_NIF_TERM enif_make_list(ErlNifEnv* env, unsigned cnt, ...)
{
    if (cnt == 0) {
	return NIL;
    }
    else {
	Eterm* hp = alloc_heap(env,cnt*2);
	Eterm ret = make_list(hp);
	Eterm* last = &ret;
	va_list ap;

	va_start(ap,cnt);
	while (cnt--) {
	    *last = make_list(hp);
	    *hp = va_arg(ap,Eterm);
	    last = ++hp;
	    ++hp;
	}
	va_end(ap);
	*last = NIL;
	return ret;
    }
}

ERL_NIF_TERM enif_make_list_from_array(ErlNifEnv* env, const ERL_NIF_TERM arr[], unsigned cnt)
{
    Eterm* hp = alloc_heap(env,cnt*2);
    Eterm ret = make_list(hp);
    Eterm* last = &ret;
    const Eterm* src = arr;

    while (cnt--) {
	*last = make_list(hp);
	*hp = *src++;
	last = ++hp;
	++hp;
    }
    *last = NIL;
    return ret;
}

ERL_NIF_TERM enif_make_string(ErlNifEnv* env, const char* string,
			      ErlNifCharEncoding encoding)
{
    return enif_make_string_len(env, string, sys_strlen(string), encoding);
}

ERL_NIF_TERM enif_make_string_len(ErlNifEnv* env, const char* string,
				  size_t len, ErlNifCharEncoding encoding)
{
    Eterm* hp = alloc_heap(env,len*2);
    ASSERT(encoding == ERL_NIF_LATIN1);
    return erts_bld_string_n(&hp,NULL,string,len);
}

ERL_NIF_TERM enif_make_ref(ErlNifEnv* env)
{
    Eterm* hp = alloc_heap(env, REF_THING_SIZE);
    return erts_make_ref_in_buffer(hp);
}

void enif_system_info(ErlNifSysInfo *sip, size_t si_size)
{
    driver_system_info(sip, si_size);
}

int enif_make_reverse_list(ErlNifEnv* env, ERL_NIF_TERM term, ERL_NIF_TERM *list) {
    Eterm *listptr, ret = NIL, *hp;

    if (is_nil(term)) {
	*list = term;
        return 1;
    }

    ret = NIL;

    while (is_not_nil(term)) {
	if (is_not_list(term)) {
	    return 0;
	}
	hp = alloc_heap(env, 2);
	listptr = list_val(term);
	ret = CONS(hp, CAR(listptr), ret);
	term = CDR(listptr);
    }
    *list = ret;
    return 1;
}

int enif_is_process_alive(ErlNifEnv* env, ErlNifPid *proc)
{
    ErtsProcLocks rp_locks = 0; /* We don't need any locks,
                                   just to check if it is alive */
    Eterm target = proc->pid;
    Process* rp;
    Process* c_p;
    int scheduler = erts_get_scheduler_id() != 0;

    if (env != NULL) {
	c_p = env->proc;
	if (target == c_p->common.id) {
            /* We are alive! */
	    return 1;
	}
    }
    else {
#ifdef ERTS_SMP
	c_p = NULL;
#else
	erts_exit(ERTS_ABORT_EXIT,"enif_is_process_alive: "
                  "env==NULL on non-SMP VM");
#endif
    }

    rp = (scheduler
	  ? erts_proc_lookup(target)
	  : erts_pid2proc_opt(c_p, ERTS_PROC_LOCK_MAIN,
			      target, rp_locks, ERTS_P2P_FLG_INC_REFC));
    if (rp == NULL) {
        ASSERT(env == NULL || target != c_p->common.id);
	return 0;
    } else {
        if (!scheduler)
            erts_proc_dec_refc(rp);
        return 1;
    }
}

int enif_is_port_alive(ErlNifEnv *env, ErlNifPort *port)
{
    /* only allowed if called from scheduler */
    if (erts_get_scheduler_id() == 0)
        erts_exit(ERTS_ABORT_EXIT,"enif_is_port_alive: called from non-scheduler");

    return erts_port_lookup(
        port->port_id,
        (erts_port_synchronous_ops
         ? ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP
         : ERTS_PORT_SFLGS_INVALID_LOOKUP)) != NULL;
}

ERL_NIF_TERM
enif_now_time(ErlNifEnv *env)
{
    Uint mega, sec, micro;
    Eterm *hp;
    get_now(&mega, &sec, &micro);
    hp = alloc_heap(env, 4);
    return TUPLE3(hp, make_small(mega), make_small(sec), make_small(micro));
}

ERL_NIF_TERM
enif_cpu_time(ErlNifEnv *env)
{
#ifdef HAVE_ERTS_NOW_CPU
    Uint mega, sec, micro;
    Eterm *hp;
    erts_get_now_cpu(&mega, &sec, &micro);
    hp = alloc_heap(env, 4);
    return TUPLE3(hp, make_small(mega), make_small(sec), make_small(micro));
#else
    return enif_make_badarg(env);
#endif
}

ERL_NIF_TERM
enif_make_unique_integer(ErlNifEnv *env, ErlNifUniqueInteger properties)
{
    int monotonic = properties & ERL_NIF_UNIQUE_MONOTONIC;
    int positive = properties & ERL_NIF_UNIQUE_POSITIVE;
    Eterm *hp;
    Uint hsz;

    if (monotonic) {
        Sint64 raw_unique = erts_raw_get_unique_monotonic_integer();
        hsz = erts_raw_unique_monotonic_integer_heap_size(raw_unique, positive);
        hp = alloc_heap(env, hsz);
        return erts_raw_make_unique_monotonic_integer_value(&hp, raw_unique, positive);
    } else {
        Uint64 raw_unique[ERTS_UNIQUE_INT_RAW_VALUES];
        erts_raw_get_unique_integer(raw_unique);
        hsz = erts_raw_unique_integer_heap_size(raw_unique, positive);
        hp = alloc_heap(env, hsz);
        return erts_raw_make_unique_integer(&hp, raw_unique, positive);
    }
}

ErlNifMutex* enif_mutex_create(char *name) { return erl_drv_mutex_create(name); }
void enif_mutex_destroy(ErlNifMutex *mtx) {  erl_drv_mutex_destroy(mtx); }
int enif_mutex_trylock(ErlNifMutex *mtx) { return erl_drv_mutex_trylock(mtx); }
void enif_mutex_lock(ErlNifMutex *mtx) { erl_drv_mutex_lock(mtx); }
void enif_mutex_unlock(ErlNifMutex *mtx) { erl_drv_mutex_unlock(mtx); }
ErlNifCond* enif_cond_create(char *name) { return erl_drv_cond_create(name); }
void enif_cond_destroy(ErlNifCond *cnd) { erl_drv_cond_destroy(cnd); }
void enif_cond_signal(ErlNifCond *cnd) { erl_drv_cond_signal(cnd); }
void enif_cond_broadcast(ErlNifCond *cnd) { erl_drv_cond_broadcast(cnd); }
void enif_cond_wait(ErlNifCond *cnd, ErlNifMutex *mtx) { erl_drv_cond_wait(cnd,mtx); }
ErlNifRWLock* enif_rwlock_create(char *name) { return erl_drv_rwlock_create(name); }
void enif_rwlock_destroy(ErlNifRWLock *rwlck) { erl_drv_rwlock_destroy(rwlck); }
int enif_rwlock_tryrlock(ErlNifRWLock *rwlck) { return erl_drv_rwlock_tryrlock(rwlck); }
void enif_rwlock_rlock(ErlNifRWLock *rwlck) { erl_drv_rwlock_rlock(rwlck); }
void enif_rwlock_runlock(ErlNifRWLock *rwlck) { erl_drv_rwlock_runlock(rwlck); }
int enif_rwlock_tryrwlock(ErlNifRWLock *rwlck) { return erl_drv_rwlock_tryrwlock(rwlck); }
void enif_rwlock_rwlock(ErlNifRWLock *rwlck) { erl_drv_rwlock_rwlock(rwlck); }
void enif_rwlock_rwunlock(ErlNifRWLock *rwlck) { erl_drv_rwlock_rwunlock(rwlck); }
int enif_tsd_key_create(char *name, ErlNifTSDKey *key) { return erl_drv_tsd_key_create(name,key); }
void enif_tsd_key_destroy(ErlNifTSDKey key) { erl_drv_tsd_key_destroy(key); }
void enif_tsd_set(ErlNifTSDKey key, void *data) { erl_drv_tsd_set(key,data); }
void* enif_tsd_get(ErlNifTSDKey key) { return erl_drv_tsd_get(key); }
ErlNifThreadOpts* enif_thread_opts_create(char *name) { return (ErlNifThreadOpts*) erl_drv_thread_opts_create(name); }
void enif_thread_opts_destroy(ErlNifThreadOpts *opts) { erl_drv_thread_opts_destroy((ErlDrvThreadOpts*)opts); }
int enif_thread_create(char *name, ErlNifTid *tid, void* (*func)(void *),
		       void *args, ErlNifThreadOpts *opts) {
    return erl_drv_thread_create(name,tid,func,args,(ErlDrvThreadOpts*)opts);
}
ErlNifTid enif_thread_self(void) { return erl_drv_thread_self(); }
int enif_equal_tids(ErlNifTid tid1, ErlNifTid tid2) { return erl_drv_equal_tids(tid1,tid2); }
void enif_thread_exit(void *resp) { erl_drv_thread_exit(resp); }
int enif_thread_join(ErlNifTid tid, void **respp) { return erl_drv_thread_join(tid,respp); }
int enif_getenv(const char *key, char *value, size_t *value_size) { return erl_drv_getenv(key, value, value_size); }

ErlNifTime enif_monotonic_time(ErlNifTimeUnit time_unit)
{
    return (ErlNifTime) erts_napi_monotonic_time((int) time_unit);
}

ErlNifTime enif_time_offset(ErlNifTimeUnit time_unit)
{
    return (ErlNifTime) erts_napi_time_offset((int) time_unit);
}

ErlNifTime
enif_convert_time_unit(ErlNifTime val,
		       ErlNifTimeUnit from,
		       ErlNifTimeUnit to)
{
    return (ErlNifTime) erts_napi_convert_time_unit((ErtsMonotonicTime) val,
						    (int) from,
						    (int) to);
}

int enif_fprintf(void* filep, const char* format, ...) 
{ 
    int ret;
    va_list arglist;
    va_start(arglist, format);
    ret = erts_vfprintf((FILE*)filep, format, arglist);
    va_end(arglist);
    return ret;
}    

/***********************************************************
 **       Memory managed (GC'ed) "resource" objects       **
 ***********************************************************/


struct enif_resource_type_t
{
    struct enif_resource_type_t* next;   /* list of all resource types */
    struct enif_resource_type_t* prev;    
    struct erl_module_nif* owner;  /* that created this type and thus implements the destructor*/
    ErlNifResourceDtor* dtor;      /* user destructor function */
    erts_refc_t refc;  /* num of resources of this type (HOTSPOT warning)
                          +1 for active erl_module_nif */
    Eterm module;
    Eterm name;
};

/* dummy node in circular list */
struct enif_resource_type_t resource_type_list; 

typedef struct enif_resource_t
{
    struct enif_resource_type_t* type;
#ifdef DEBUG
    erts_refc_t nif_refc;
# ifdef ARCH_32
    byte align__[4];
# endif
#endif

    char data[1];
}ErlNifResource;

#define SIZEOF_ErlNifResource(SIZE) (offsetof(ErlNifResource,data) + (SIZE))
#define DATA_TO_RESOURCE(PTR) ((ErlNifResource*)((char*)(PTR) - offsetof(ErlNifResource,data)))

static ErlNifResourceType* find_resource_type(Eterm module, Eterm name)
{
    ErlNifResourceType* type;
    for (type = resource_type_list.next;
	 type != &resource_type_list;
	 type = type->next) {

	if (type->module == module && type->name == name) {
	    return type;
	}
    }
    return NULL;
}

#define in_area(ptr,start,nbytes) \
    ((UWord)((char*)(ptr) - (char*)(start)) < (nbytes))


static void close_lib(struct erl_module_nif* lib)
{
    ASSERT(lib != NULL);
    ASSERT(lib->handle != NULL);
    ASSERT(erts_refc_read(&lib->rt_dtor_cnt,0) == 0);

    if (lib->entry != NULL && lib->entry->unload != NULL) {
	ErlNifEnv env;
	pre_nif_noproc(&env, lib);
	lib->entry->unload(&env, lib->priv_data);
	post_nif_noproc(&env);
    }
    if (!erts_is_static_nif(lib->handle))
      erts_sys_ddll_close(lib->handle);
    lib->handle = NULL;
}

static void steal_resource_type(ErlNifResourceType* type)
{
    struct erl_module_nif* lib = type->owner;

    if (type->dtor != NULL
	&& erts_refc_dectest(&lib->rt_dtor_cnt, 0) == 0
	&& lib->mod == NULL) {
	/* last type with destructor gone, close orphan lib */

	close_lib(lib);
    }
    if (erts_refc_dectest(&lib->rt_cnt, 0) == 0
	&& lib->mod == NULL) {
	erts_free(ERTS_ALC_T_NIF, lib);
    }
}

/* The opened_rt_list is used by enif_open_resource_type()
 * in order to rollback "creates" and "take-overs" in case the load fails.
 */
struct opened_resource_type
{
    struct opened_resource_type* next;

    ErlNifResourceFlags op;
    ErlNifResourceType* type;
    ErlNifResourceDtor* new_dtor;
};
static struct opened_resource_type* opened_rt_list = NULL;

ErlNifResourceType*
enif_open_resource_type(ErlNifEnv* env,
			const char* module_str, 
			const char* name_str, 
			ErlNifResourceDtor* dtor,
			ErlNifResourceFlags flags,
			ErlNifResourceFlags* tried)
{
    ErlNifResourceType* type = NULL;
    ErlNifResourceFlags op = flags;
    Eterm module_am, name_am;

    ASSERT(erts_smp_thr_progress_is_blocking());
    ASSERT(module_str == NULL); /* for now... */
    module_am = make_atom(env->mod_nif->mod->module);
    name_am = enif_make_atom(env, name_str);

    type = find_resource_type(module_am, name_am);
    if (type == NULL) {
	if (flags & ERL_NIF_RT_CREATE) {
	    type = erts_alloc(ERTS_ALC_T_NIF,
			      sizeof(struct enif_resource_type_t));
	    type->module = module_am;
	    type->name = name_am;
	    erts_refc_init(&type->refc, 1);
	    op = ERL_NIF_RT_CREATE;
	#ifdef DEBUG
	    type->dtor = (void*)1;
	    type->owner = (void*)2;
	    type->prev = (void*)3;
	    type->next = (void*)4;
	#endif
	}
    }
    else {
	if (flags & ERL_NIF_RT_TAKEOVER) {
	    op = ERL_NIF_RT_TAKEOVER;
	}
	else {
	    type = NULL;
	}
    }
    if (type != NULL) {
	struct opened_resource_type* ort = erts_alloc(ERTS_ALC_T_TMP,
						sizeof(struct opened_resource_type));
	ort->op = op;
	ort->type = type;
	ort->new_dtor = dtor;
	ort->next = opened_rt_list;
	opened_rt_list = ort;
    }
    if (tried != NULL) {
	*tried = op;
    }
    return type;
}

static void commit_opened_resource_types(struct erl_module_nif* lib)
{
    while (opened_rt_list) {
	struct opened_resource_type* ort = opened_rt_list;

	ErlNifResourceType* type = ort->type;

	if (ort->op == ERL_NIF_RT_CREATE) {
	    type->prev = &resource_type_list;
	    type->next = resource_type_list.next;
	    type->next->prev = type;
	    type->prev->next = type;
	}
	else { /* ERL_NIF_RT_TAKEOVER */
	    steal_resource_type(type);
	}

	type->owner = lib;
	type->dtor = ort->new_dtor;

	if (type->dtor != NULL) {
	    erts_refc_inc(&lib->rt_dtor_cnt, 1);
	}
	erts_refc_inc(&lib->rt_cnt, 1);

	opened_rt_list = ort->next;
	erts_free(ERTS_ALC_T_TMP, ort);
    }
}

static void rollback_opened_resource_types(void)
{
    while (opened_rt_list) {
	struct opened_resource_type* ort = opened_rt_list;

	if (ort->op == ERL_NIF_RT_CREATE) {
	    erts_free(ERTS_ALC_T_NIF, ort->type);
	}

	opened_rt_list = ort->next;
	erts_free(ERTS_ALC_T_TMP, ort);
    }
}


static void nif_resource_dtor(Binary* bin)
{
    ErlNifResource* resource = (ErlNifResource*) ERTS_MAGIC_BIN_UNALIGNED_DATA(bin);
    ErlNifResourceType* type = resource->type;
    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == &nif_resource_dtor);

    if (type->dtor != NULL) {
	ErlNifEnv env;
	pre_nif_noproc(&env, type->owner);
	type->dtor(&env,resource->data);
	post_nif_noproc(&env);
    }
    if (erts_refc_dectest(&type->refc, 0) == 0) {
	ASSERT(type->next == NULL);
	ASSERT(type->owner != NULL);
	ASSERT(type->owner->mod == NULL);
	steal_resource_type(type);
	erts_free(ERTS_ALC_T_NIF, type);
    }
}

void* enif_alloc_resource(ErlNifResourceType* type, size_t size)
{
    Binary* bin = erts_create_magic_binary_x(SIZEOF_ErlNifResource(size),
                                             &nif_resource_dtor,
                                             1); /* unaligned */
    ErlNifResource* resource = ERTS_MAGIC_BIN_UNALIGNED_DATA(bin);

    ASSERT(type->owner && type->next && type->prev); /* not allowed in load/upgrade */
    resource->type = type;
    erts_refc_inc(&bin->refc, 1);
#ifdef DEBUG
    erts_refc_init(&resource->nif_refc, 1);
#endif
    erts_refc_inc(&resource->type->refc, 2);
    return resource->data;
}

void enif_release_resource(void* obj)
{
    ErlNifResource* resource = DATA_TO_RESOURCE(obj);
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);

    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == &nif_resource_dtor);
#ifdef DEBUG
    erts_refc_dec(&resource->nif_refc, 0);
#endif
    if (erts_refc_dectest(&bin->binary.refc, 0) == 0) {
	erts_bin_free(&bin->binary);
    }
}

void enif_keep_resource(void* obj)
{
    ErlNifResource* resource = DATA_TO_RESOURCE(obj);
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);

    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == &nif_resource_dtor);
#ifdef DEBUG
    erts_refc_inc(&resource->nif_refc, 1);
#endif
    erts_refc_inc(&bin->binary.refc, 2);
}

ERL_NIF_TERM enif_make_resource(ErlNifEnv* env, void* obj)
{
    ErlNifResource* resource = DATA_TO_RESOURCE(obj);
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);
    Eterm* hp = alloc_heap(env,PROC_BIN_SIZE);
    return erts_mk_magic_binary_term(&hp, &MSO(env->proc), &bin->binary);
}

ERL_NIF_TERM enif_make_resource_binary(ErlNifEnv* env, void* obj,
				       const void* data, size_t size)
{
    Eterm bin = enif_make_resource(env, obj);
    ProcBin* pb = (ProcBin*) binary_val(bin);
    pb->bytes = (byte*) data;
    pb->size = size;
    return bin;
}

int enif_get_resource(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifResourceType* type,
		      void** objp)
{
    ProcBin* pb;
    Binary* mbin;
    ErlNifResource* resource;
    if (!ERTS_TERM_IS_MAGIC_BINARY(term)) {
	return 0;
    }
    pb = (ProcBin*) binary_val(term);
    /*if (pb->size != 0) {	
	return 0; / * Or should we allow "resource binaries" as handles? * /
    }*/
    mbin = pb->val;
    resource = (ErlNifResource*) ERTS_MAGIC_BIN_UNALIGNED_DATA(mbin);
    if (ERTS_MAGIC_BIN_DESTRUCTOR(mbin) != &nif_resource_dtor
	|| resource->type != type) {	
	return 0;
    }
    *objp = resource->data;
    return 1;
}

size_t enif_sizeof_resource(void* obj)
{
    ErlNifResource* resource = DATA_TO_RESOURCE(obj);
    Binary* bin = &ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource)->binary;
    return ERTS_MAGIC_BIN_UNALIGNED_DATA_SIZE(bin) - offsetof(ErlNifResource,data);
}


void* enif_dlopen(const char* lib,
		  void (*err_handler)(void*,const char*), void* err_arg)
{
    ErtsSysDdllError errdesc = ERTS_SYS_DDLL_ERROR_INIT;
    void* handle;
    void* init_func;
    if (erts_sys_ddll_open(lib, &handle, &errdesc) == ERL_DE_NO_ERROR) {
	if (erts_sys_ddll_load_nif_init(handle, &init_func, &errdesc) == ERL_DE_NO_ERROR) {
	    erts_sys_ddll_call_nif_init(init_func);
	}
    }
    else {
	if (err_handler != NULL) {
	    (*err_handler)(err_arg, errdesc.str);
	}
	handle = NULL;
    }
    erts_sys_ddll_free_error(&errdesc);
    return handle;
}

void* enif_dlsym(void* handle, const char* symbol,
		 void (*err_handler)(void*,const char*), void* err_arg)
{
    ErtsSysDdllError errdesc = ERTS_SYS_DDLL_ERROR_INIT;
    void* ret;
    if (erts_sys_ddll_sym2(handle, symbol, &ret, &errdesc) != ERL_DE_NO_ERROR) {
	if (err_handler != NULL) {
	    (*err_handler)(err_arg, errdesc.str);
	}
	erts_sys_ddll_free_error(&errdesc);
	return NULL;
    }
    return ret;
}

int enif_consume_timeslice(ErlNifEnv* env, int percent)
{
    Sint reds;

    ASSERT(is_proc_bound(env) && percent >= 1 && percent <= 100);
    if (percent < 1) percent = 1;
    else if (percent > 100) percent = 100;

    reds = ((CONTEXT_REDS+99) / 100) * percent;
    ASSERT(reds > 0 && reds <= CONTEXT_REDS);
    BUMP_REDS(env->proc, reds);
    return ERTS_BIF_REDS_LEFT(env->proc) == 0;
}

/*
 * NIF exports need a few more items than the Export struct provides,
 * including the erl_module_nif* and a NIF function pointer, so the
 * NifExport below adds those. The Export member must be first in the
 * struct. The saved_mfa, exception_thrown, saved_argc, rootset_extra, and
 * rootset members are used to track the MFA, any pending exception, and
 * arguments of the top NIF in case a chain of one or more
 * enif_schedule_nif() calls results in an exception, since in that case
 * the original MFA and registers have to be restored before returning to
 * Erlang to ensure stacktrace information associated with the exception is
 * correct.
 */
typedef ERL_NIF_TERM (*NativeFunPtr)(ErlNifEnv*, int, const ERL_NIF_TERM[]);

typedef struct {
    Export exp;
    struct erl_module_nif* m;
    NativeFunPtr fp;
    Eterm saved_mfa[3];
    int exception_thrown;
    int saved_argc;
    int rootset_extra;
    Eterm rootset[1];
} NifExport;

/*
 * If a process has saved arguments, they need to be part of the GC
 * rootset. The function below is called from setup_rootset() in
 * erl_gc.c. This function is declared in erl_process.h. Any exception term
 * saved in the NifExport is also made part of the GC rootset here; it
 * always resides in rootset[0].
 */
int
erts_setup_nif_gc(Process* proc, Eterm** objv, int* nobj)
{
    NifExport* ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    int gc = ep && (ep->saved_argc > 0 || ep->rootset[0] != NIL);

    if (gc) {
	*objv = ep->rootset;
	*nobj = 1 + ep->saved_argc;
    }
    return gc;
}

/*
 * Allocate a NifExport and set it in proc specific data
 */
static NifExport*
allocate_nif_sched_data(Process* proc, int argc)
{
    NifExport* ep;
    size_t total;
    int i;

    total = sizeof(NifExport) + argc*sizeof(Eterm);
    ep = erts_alloc(ERTS_ALC_T_NIF_TRAP_EXPORT, total);
    sys_memset((void*) ep, 0, total);
    ep->rootset_extra = argc;
    ep->rootset[0] = NIL;
    for (i=0; i<ERTS_NUM_CODE_IX; i++) {
	ep->exp.addressv[i] = &ep->exp.code[3];
    }
    ep->exp.code[3] = (BeamInstr) em_call_nif;
    (void) ERTS_PROC_SET_NIF_TRAP_EXPORT(proc, ep);
    return ep;
}

static ERTS_INLINE void
destroy_nif_export(NifExport *nif_export)
{
    erts_free(ERTS_ALC_T_NIF_TRAP_EXPORT, (void *) nif_export);
}

void
erts_destroy_nif_export(void *nif_export)
{
    destroy_nif_export((NifExport *) nif_export);
}

/*
 * Initialize a NifExport struct. Create it if needed and store it in the
 * proc. The direct_fp function is what will be invoked by op_call_nif, and
 * the indirect_fp function, if not NULL, is what the direct_fp function
 * will call. If the allocated NifExport isn't enough to hold all of argv,
 * allocate a larger one. Save MFA and registers only if the need_save
 * parameter is true.
 */
static ERL_NIF_TERM
init_nif_sched_data(ErlNifEnv* env, NativeFunPtr direct_fp, NativeFunPtr indirect_fp,
		    int need_save, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    Eterm* reg = ERTS_PROC_GET_SCHDATA(proc)->x_reg_array;
    NifExport* ep;
    int i;

    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    if (!ep)
	ep = allocate_nif_sched_data(proc, argc);
    else if (need_save && ep->rootset_extra < argc) {
	NifExport* new_ep = allocate_nif_sched_data(proc, argc);
	destroy_nif_export(ep);
	ep = new_ep;
    }
    if (env->exception_thrown) {
	ep->exception_thrown = 1;
	ep->rootset[0] = env->proc->fvalue;
    } else {
	ep->exception_thrown = 0;
	ep->rootset[0] = NIL;
    }
    ERTS_VBUMP_ALL_REDS(proc);
    for (i = 0; i < argc; i++) {
	if (need_save)
	    ep->rootset[i+1] = reg[i];
	reg[i] = (Eterm) argv[i];
    }
    if (need_save) {
	ep->saved_mfa[0] = proc->current[0];
	ep->saved_mfa[1] = proc->current[1];
	ep->saved_mfa[2] = proc->current[2];
	ep->saved_argc = argc;
    }
    proc->i = (BeamInstr*) ep->exp.addressv[0];
    ep->exp.code[0] = (BeamInstr) proc->current[0];
    ep->exp.code[1] = (BeamInstr) proc->current[1];
    ep->exp.code[2] = argc;
    ep->exp.code[4] = (BeamInstr) direct_fp;
    ep->m = env->mod_nif;
    ep->fp = indirect_fp;
    proc->freason = TRAP;
    proc->arity = argc;
    return THE_NON_VALUE;
}

/*
 * Restore saved MFA and registers. Registers are restored only when the
 * exception flag is true.
 */
static void
restore_nif_mfa(Process* proc, NifExport* ep, int exception)
{
    int i;
    Eterm* reg = ERTS_PROC_GET_SCHDATA(proc)->x_reg_array;

    proc->current[0] = ep->saved_mfa[0];
    proc->current[1] = ep->saved_mfa[1];
    proc->current[2] = ep->saved_mfa[2];
    if (exception)
	for (i = 0; i < ep->saved_argc; i++)
	    reg[i] = ep->rootset[i+1];
    ep->saved_argc = 0;
    ep->saved_mfa[0] = THE_NON_VALUE;
}

#ifdef ERTS_DIRTY_SCHEDULERS

/*
 * Finalize a dirty NIF call. This function is scheduled to cause the VM to
 * switch the process off a dirty scheduler thread and back onto a regular
 * scheduler thread, and then return the result from the dirty NIF. It also
 * restores the original NIF MFA when necessary based on the value of
 * ep->fp set by execute_dirty_nif via init_nif_sched_data -- non-NULL
 * means restore, NULL means do not restore.
 */
static ERL_NIF_TERM
dirty_nif_finalizer(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    NifExport* ep;

    ASSERT(argc == 1);
    ASSERT(!ERTS_SCHEDULER_IS_DIRTY(env->proc->scheduler_data));
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    ASSERT(!ep->exception_thrown);
    if (ep->fp)
	restore_nif_mfa(proc, ep, 0);
    return argv[0];
}

/* Finalize a dirty NIF call that raised an exception.  Otherwise same as
 * the dirty_nif_finalizer() function.
 */
static ERL_NIF_TERM
dirty_nif_exception(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    NifExport* ep;

    ASSERT(!ERTS_SCHEDULER_IS_DIRTY(env->proc->scheduler_data));
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    ASSERT(ep->exception_thrown);
    if (ep->fp)
	restore_nif_mfa(proc, ep, 1);
    return enif_raise_exception(env, ep->rootset[0]);
}

/*
 * Dirty NIF execution wrapper function. Invoke an application's dirty NIF,
 * then check the result and schedule the appropriate finalizer function
 * where needed. Also restore the original NIF MFA when appropriate.
 */
static ERL_NIF_TERM
execute_dirty_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    NativeFunPtr fp = (NativeFunPtr) proc->current[6];
    NifExport* ep;
    ERL_NIF_TERM result;

    ASSERT(ERTS_SCHEDULER_IS_DIRTY(env->proc->scheduler_data));

    /*
     * Set ep->fp to NULL before the native call so we know later whether it scheduled another NIF for execution
     */
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    ep->fp = NULL;
    erts_smp_atomic32_read_band_mb(&proc->state, ~(ERTS_PSFLG_DIRTY_CPU_PROC
						   | ERTS_PSFLG_DIRTY_IO_PROC));
    result = (*fp)(env, argc, argv);

    if (erts_refc_dectest(&env->mod_nif->rt_dtor_cnt, 0) == 0 && env->mod_nif->mod == NULL)
	close_lib(env->mod_nif);
    /*
     * If no more NIFs were scheduled by the native call via
     * enif_schedule_nif(), then ep->fp will still be NULL as set above, in
     * which case we need to restore the original NIF calling
     * context. Reuse fp essentially as a boolean for this, passing it to
     * init_nif_sched_data below. Both dirty_nif_exception and
     * dirty_nif_finalizer then check ep->fp to decide whether or not to
     * restore the original calling context.
     */
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    if (ep->fp)
	fp = NULL;
    if (is_non_value(result) || env->exception_thrown) {
	if (proc->freason != TRAP) {
	    return init_nif_sched_data(env, dirty_nif_exception, fp, 0, argc, argv);
	} else {
	    if (ep->fp == NULL)
		restore_nif_mfa(proc, ep, 1);
	    return THE_NON_VALUE;
	}
    }
    else
	return init_nif_sched_data(env, dirty_nif_finalizer, fp, 0, 1, &result);
}

/*
 * Dirty NIF scheduling wrapper function. Schedule a dirty NIF to execute
 * via the execute_dirty_nif() wrapper function. The dirty scheduler thread
 * type (CPU or I/O) is indicated in flags parameter.
 */
static ERTS_INLINE ERL_NIF_TERM
schedule_dirty_nif(ErlNifEnv* env, int flags, int argc, const ERL_NIF_TERM argv[])
{
    erts_aint32_t state, n, a;
    Process* proc = env->proc;
    NativeFunPtr fp = (NativeFunPtr) proc->current[6];
    NifExport* ep;
    int need_save;

    ASSERT(flags==ERL_NIF_DIRTY_JOB_IO_BOUND || flags==ERL_NIF_DIRTY_JOB_CPU_BOUND);

    a = erts_smp_atomic32_read_acqb(&proc->state);
    while (1) {
	n = state = a;
	if (flags == ERL_NIF_DIRTY_JOB_CPU_BOUND)
	    n |= ERTS_PSFLG_DIRTY_CPU_PROC;
	else
	    n |= ERTS_PSFLG_DIRTY_IO_PROC;
	a = erts_smp_atomic32_cmpxchg_mb(&proc->state, n, state);
	if (a == state)
	    break;
    }
    erts_refc_inc(&env->mod_nif->rt_dtor_cnt, 1);
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    need_save = (ep == NULL || is_non_value(ep->saved_mfa[0]));
    return init_nif_sched_data(env, execute_dirty_nif, fp, need_save, argc, argv);
}

static ERL_NIF_TERM
schedule_dirty_io_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    return schedule_dirty_nif(env, ERL_NIF_DIRTY_JOB_IO_BOUND, argc, argv);
}

static ERL_NIF_TERM
schedule_dirty_cpu_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    return schedule_dirty_nif(env, ERL_NIF_DIRTY_JOB_CPU_BOUND, argc, argv);
}

#endif /* ERTS_DIRTY_SCHEDULERS */

/*
 * NIF execution wrapper used by enif_schedule_nif() for regular NIFs. It
 * calls the actual NIF, restores original NIF MFA if necessary, and
 * then returns the NIF result.
 */
static ERL_NIF_TERM
execute_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    NativeFunPtr fp = (NativeFunPtr) proc->current[6];
    NifExport* ep;
    ERL_NIF_TERM result;

    ASSERT(!env->exception_thrown);
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    ep->fp = NULL;
    result = (*fp)(env, argc, argv);
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    /*
     * If no NIFs were scheduled by the native call via
     * enif_schedule_nif(), then ep->fp will still be NULL as set above, in
     * which case we need to restore the original NIF MFA.
     */
    if (ep->fp == NULL)
	restore_nif_mfa(proc, ep, env->exception_thrown);
    return result;
}

ERL_NIF_TERM
enif_schedule_nif(ErlNifEnv* env, const char* fun_name, int flags,
		  ERL_NIF_TERM (*fp)(ErlNifEnv*, int, const ERL_NIF_TERM[]),
		  int argc, const ERL_NIF_TERM argv[])
{
    Process* proc = env->proc;
    NifExport* ep;
    ERL_NIF_TERM fun_name_atom, result;
    int need_save;

    if (argc > MAX_ARG)
	return enif_make_badarg(env);
    fun_name_atom = enif_make_atom(env, fun_name);
    if (enif_is_exception(env, fun_name_atom))
	return fun_name_atom;

    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    need_save = (ep == NULL || is_non_value(ep->saved_mfa[0]));

    if (flags) {
#ifdef ERTS_DIRTY_SCHEDULERS
	NativeFunPtr sched_fun;
	int chkflgs = (flags & (ERL_NIF_DIRTY_JOB_IO_BOUND|ERL_NIF_DIRTY_JOB_CPU_BOUND));
	if (chkflgs == ERL_NIF_DIRTY_JOB_IO_BOUND)
	    sched_fun = schedule_dirty_io_nif;
	else if (chkflgs == ERL_NIF_DIRTY_JOB_CPU_BOUND)
	    sched_fun = schedule_dirty_cpu_nif;
	else
	    return enif_make_badarg(env);
	result = init_nif_sched_data(env, sched_fun, fp, need_save, argc, argv);
#else
	return enif_make_badarg(env);
#endif
    }
    else
	result = init_nif_sched_data(env, execute_nif, fp, need_save, argc, argv);

    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    ep->exp.code[1] = (BeamInstr) fun_name_atom;
    return result;
}

#ifdef ERL_NIF_DIRTY_SCHEDULER_SUPPORT

int
enif_is_on_dirty_scheduler(ErlNifEnv* env)
{
    return ERTS_SCHEDULER_IS_DIRTY(env->proc->scheduler_data);
}

#endif /* ERL_NIF_DIRTY_SCHEDULER_SUPPORT */

/* Maps */

int enif_is_map(ErlNifEnv* env, ERL_NIF_TERM term)
{
    return is_map(term);
}

int enif_get_map_size(ErlNifEnv* env, ERL_NIF_TERM term, size_t *size)
{
    if (is_flatmap(term)) {
	flatmap_t *mp;
	mp    = (flatmap_t*)flatmap_val(term);
	*size = flatmap_get_size(mp);
	return 1;
    }
    else if (is_hashmap(term)) {
        *size = hashmap_size(term);
        return 1;
    }
    return 0;
}

ERL_NIF_TERM enif_make_new_map(ErlNifEnv* env)
{
    Eterm* hp = alloc_heap(env,MAP_HEADER_FLATMAP_SZ+1);
    Eterm tup;
    flatmap_t *mp;

    tup   = make_tuple(hp);
    *hp++ = make_arityval(0);
    mp    = (flatmap_t*)hp;
    mp->thing_word = MAP_HEADER_FLATMAP;
    mp->size = 0;
    mp->keys = tup;

    return make_flatmap(mp);
}

int enif_make_map_put(ErlNifEnv* env,
	              Eterm map_in,
		      Eterm key,
		      Eterm value,
		      Eterm *map_out)
{
    if (!is_map(map_in)) {
	return 0;
    }
    flush_env(env);
    *map_out = erts_maps_put(env->proc, key, value, map_in);
    cache_env(env);
    return 1;
}

int enif_get_map_value(ErlNifEnv* env,
	               Eterm map,
		       Eterm key,
		       Eterm *value)
{
    const Eterm *ret;
    if (!is_map(map)) {
	return 0;
    }
    ret = erts_maps_get(key, map);
    if (ret) {
        *value = *ret;
        return 1;
    }
    return 0;
}

int enif_make_map_update(ErlNifEnv* env,
	                 Eterm map_in,
			 Eterm key,
			 Eterm value,
			 Eterm *map_out)
{
    int res;
    if (!is_map(map_in)) {
	return 0;
    }

    flush_env(env);
    res = erts_maps_update(env->proc, key, value, map_in, map_out);
    cache_env(env);
    return res;
}

int enif_make_map_remove(ErlNifEnv* env,
	                 Eterm map_in,
			 Eterm key,
			 Eterm *map_out)
{
    int res;
    if (!is_map(map_in)) {
	return 0;
    }
    flush_env(env);
    res = erts_maps_remove(env->proc, key, map_in, map_out);
    cache_env(env);
    return res;
}

int enif_map_iterator_create(ErlNifEnv *env,
	                     Eterm map,
			     ErlNifMapIterator *iter,
			     ErlNifMapIteratorEntry entry)
{
    if (is_flatmap(map)) {
	flatmap_t *mp = (flatmap_t*)flatmap_val(map);
	size_t offset;

	switch (entry) {
	    case ERL_NIF_MAP_ITERATOR_FIRST: offset = 0; break;
	    case ERL_NIF_MAP_ITERATOR_LAST: offset = flatmap_get_size(mp) - 1; break;
	    default: goto error;
	}

	/* empty maps are ok but will leave the iterator
	 * in bad shape.
	 */

	iter->map     = map;
	iter->u.flat.ks = ((Eterm *)flatmap_get_keys(mp)) + offset;
	iter->u.flat.vs = ((Eterm *)flatmap_get_values(mp)) + offset;
	iter->size    = flatmap_get_size(mp);
	iter->idx     = offset + 1;

	return 1;
    }
    else if (is_hashmap(map)) {
        iter->map = map;
        iter->size = hashmap_size(map);
        iter->u.hash.wstack = erts_alloc(ERTS_ALC_T_NIF, sizeof(ErtsDynamicWStack));
        WSTACK_INIT(iter->u.hash.wstack, ERTS_ALC_T_NIF);

        switch (entry) {
	    case ERL_NIF_MAP_ITERATOR_FIRST:
                iter->idx = 1;
                hashmap_iterator_init(&iter->u.hash.wstack->ws, map, 0);
                iter->u.hash.kv = hashmap_iterator_next(&iter->u.hash.wstack->ws);
                break;
	    case ERL_NIF_MAP_ITERATOR_LAST:
                iter->idx = hashmap_size(map);
                hashmap_iterator_init(&iter->u.hash.wstack->ws, map, 1);
                iter->u.hash.kv = hashmap_iterator_prev(&iter->u.hash.wstack->ws);
                break;
	    default:
                goto error;
	}
        ASSERT(!!iter->u.hash.kv == (iter->idx >= 1 &&
                                     iter->idx <= iter->size));
        return 1;
    }
error:
#ifdef DEBUG
    iter->map = THE_NON_VALUE;
#endif
    return 0;
}

void enif_map_iterator_destroy(ErlNifEnv *env, ErlNifMapIterator *iter)
{
    if (is_hashmap(iter->map)) {
        WSTACK_DESTROY(iter->u.hash.wstack->ws);
        erts_free(ERTS_ALC_T_NIF, iter->u.hash.wstack);
    }
    else
        ASSERT(is_flatmap(iter->map));

#ifdef DEBUG
    iter->map = THE_NON_VALUE;
#endif
}

int enif_map_iterator_is_tail(ErlNifEnv *env, ErlNifMapIterator *iter)
{
    ASSERT(iter);
    if (is_flatmap(iter->map)) {
        ASSERT(iter->idx >= 0);
        ASSERT(iter->idx <= flatmap_get_size(flatmap_val(iter->map)) + 1);
        return (iter->size == 0 || iter->idx > iter->size);
    }
    else {
        ASSERT(is_hashmap(iter->map));
        return iter->idx > iter->size;
    }
}

int enif_map_iterator_is_head(ErlNifEnv *env, ErlNifMapIterator *iter)
{
    ASSERT(iter);
    if (is_flatmap(iter->map)) {
        ASSERT(iter->idx >= 0);
        ASSERT(iter->idx <= flatmap_get_size(flatmap_val(iter->map)) + 1);
        return (iter->size == 0 || iter->idx == 0);
    }
    else {
        ASSERT(is_hashmap(iter->map));
        return iter->idx == 0;
    }
}


int enif_map_iterator_next(ErlNifEnv *env, ErlNifMapIterator *iter)
{
    ASSERT(iter);
    if (is_flatmap(iter->map)) {
        if (iter->idx <= iter->size) {
            iter->idx++;
            iter->u.flat.ks++;
            iter->u.flat.vs++;
        }
        return (iter->idx <= iter->size);
    }
    else {
        ASSERT(is_hashmap(iter->map));

        if (iter->idx <= hashmap_size(iter->map)) {
            if (iter->idx < 1) {
                hashmap_iterator_init(&iter->u.hash.wstack->ws, iter->map, 0);
            }
            iter->u.hash.kv = hashmap_iterator_next(&iter->u.hash.wstack->ws);
            iter->idx++;
            ASSERT(!!iter->u.hash.kv == (iter->idx <= iter->size));
        }
        return iter->idx <= iter->size;
    }
}

int enif_map_iterator_prev(ErlNifEnv *env, ErlNifMapIterator *iter)
{
    ASSERT(iter);
    if (is_flatmap(iter->map)) {
        if (iter->idx > 0) {
            iter->idx--;
            iter->u.flat.ks--;
            iter->u.flat.vs--;
        }
        return iter->idx > 0;
    }
    else {
        ASSERT(is_hashmap(iter->map));

        if (iter->idx > 0) {
            if (iter->idx > iter->size) {
                hashmap_iterator_init(&iter->u.hash.wstack->ws, iter->map, 1);
            }
            iter->u.hash.kv = hashmap_iterator_prev(&iter->u.hash.wstack->ws);
            iter->idx--;
            ASSERT(!!iter->u.hash.kv == (iter->idx > 0));
        }
        return iter->idx > 0;
    }
}

int enif_map_iterator_get_pair(ErlNifEnv *env,
			       ErlNifMapIterator *iter,
			       Eterm *key,
			       Eterm *value)
{
    ASSERT(iter);
    if (is_flatmap(iter->map)) {
        if (iter->idx > 0 && iter->idx <= iter->size) {
            ASSERT(iter->u.flat.ks >= flatmap_get_keys(flatmap_val(iter->map)) &&
                   iter->u.flat.ks  < (flatmap_get_keys(flatmap_val(iter->map)) + flatmap_get_size(flatmap_val(iter->map))));
            ASSERT(iter->u.flat.vs >= flatmap_get_values(flatmap_val(iter->map)) &&
                   iter->u.flat.vs  < (flatmap_get_values(flatmap_val(iter->map)) + flatmap_get_size(flatmap_val(iter->map))));
            *key   = *(iter->u.flat.ks);
            *value = *(iter->u.flat.vs);
            return 1;
        }
    }
    else {
        ASSERT(is_hashmap(iter->map));
        if (iter->idx > 0 && iter->idx <= iter->size) {
            *key   = CAR(iter->u.hash.kv);
            *value = CDR(iter->u.hash.kv);
            return 1;
        }
    }
    return 0;
}

/***************************************************************************
 **                              load_nif/2                               **
 ***************************************************************************/


static BeamInstr** get_func_pp(BeamCodeHeader* mod_code, Eterm f_atom, unsigned arity)
{
    int n = (int) mod_code->num_functions;
    int j;
    for (j = 0; j < n; ++j) {
	BeamInstr* code_ptr = (BeamInstr*) mod_code->functions[j];
	ASSERT(code_ptr[0] == (BeamInstr) BeamOp(op_i_func_info_IaaI));
	if (f_atom == ((Eterm) code_ptr[3])
	    && arity == ((unsigned) code_ptr[4])) {

	    return (BeamInstr**) &mod_code->functions[j];
	}
    }
    return NULL;
}

static Eterm mkatom(const char *str)
{
    return am_atom_put(str, sys_strlen(str));
}

static struct tainted_module_t
{
    struct tainted_module_t* next;
    Eterm module_atom;
}*first_tainted_module = NULL;

static void add_taint(Eterm mod_atom)
{
    struct tainted_module_t* t;
    for (t=first_tainted_module ; t!=NULL; t=t->next) {
	if (t->module_atom == mod_atom) {
	    return;
	}
    }
    t = erts_alloc_fnf(ERTS_ALC_T_TAINT, sizeof(*t));
    if (t != NULL) {
	t->module_atom = mod_atom;
	t->next = first_tainted_module;
	first_tainted_module = t;
    }
}

Eterm erts_nif_taints(Process* p)
{
    struct tainted_module_t* t;
    unsigned cnt = 0;
    Eterm list = NIL;
    Eterm* hp;
    for (t=first_tainted_module ; t!=NULL; t=t->next) {
	cnt++;
    }
    hp = HAlloc(p,cnt*2);
    for (t=first_tainted_module ; t!=NULL; t=t->next) {
	list = CONS(hp, t->module_atom, list);
	hp += 2;
    }
    return list;
}

void erts_print_nif_taints(int to, void* to_arg)
{
    struct tainted_module_t* t;
    const char* delim = "";
    for (t=first_tainted_module ; t!=NULL; t=t->next) {
	const Atom* atom = atom_tab(atom_val(t->module_atom));
	erts_print(to,to_arg,"%s%.*s", delim, atom->len, atom->name);
	delim = ",";
    }
    erts_print(to,to_arg,"\n");
}


static Eterm load_nif_error(Process* p, const char* atom, const char* format, ...)
{
    erts_dsprintf_buf_t* dsbufp = erts_create_tmp_dsbuf(0);
    Eterm ret;
    Eterm* hp;
    Eterm** hpp = NULL;
    Uint sz = 0;
    Uint* szp = &sz;
    va_list arglist;   

    va_start(arglist, format);
    erts_vdsprintf(dsbufp, format, arglist);
    va_end(arglist);
    
    for (;;) {
	Eterm txt = erts_bld_string_n(hpp, &sz, dsbufp->str, dsbufp->str_len);
	ret = erts_bld_tuple(hpp, szp, 2, am_error,
			     erts_bld_tuple(hpp, szp, 2, mkatom(atom), txt));
	if (hpp != NULL) {
	    break;
	}
	hp = HAlloc(p,sz);
	hpp = &hp;
	szp = NULL;
    }
    erts_destroy_tmp_dsbuf(dsbufp);
    return ret;
}

/*
 * The function below is for looping through ErlNifFunc arrays, helping
 * provide backwards compatibility across the version 2.7 change that added
 * the "flags" field to ErlNifFunc.
 */
static ErlNifFunc* next_func(ErlNifEntry* entry, int* incrp, ErlNifFunc* func)
{
    ASSERT(incrp);
    if (!*incrp) {
	if (entry->major > 2 || (entry->major == 2 && entry->minor >= 7))
	    *incrp = sizeof(ErlNifFunc);
	else {
	    /*
	     * ErlNifFuncV1 below is what ErlNifFunc was before the
	     * addition of the flags field for 2.7, and is needed to handle
	     * backward compatibility.
	     */
	    typedef struct {
		const char* name;
		unsigned arity;
		ERL_NIF_TERM (*fptr)(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
	    }ErlNifFuncV1;
	    *incrp = sizeof(ErlNifFuncV1);
	}
    }
    return (ErlNifFunc*) ((char*)func + *incrp);
}


BIF_RETTYPE load_nif_2(BIF_ALIST_2)
{
    static const char bad_lib[] = "bad_lib";
    static const char reload[] = "reload";
    static const char upgrade[] = "upgrade";
    char* lib_name = NULL;
    void* handle = NULL;
    void* init_func = NULL;
    ErlNifEntry* entry = NULL;
    ErlNifEnv env;
    int i, err, encoding;
    Module* mod;
    Eterm mod_atom;
    const Atom* mod_atomp;
    Eterm f_atom;
    BeamInstr* caller;
    ErtsSysDdllError errdesc = ERTS_SYS_DDLL_ERROR_INIT;
    Eterm ret = am_ok;
    int veto;
    struct erl_module_nif* lib = NULL;
    int reload_warning = 0;

    encoding = erts_get_native_filename_encoding();
    if (encoding == ERL_FILENAME_WIN_WCHAR) {
        /* Do not convert the lib name to utf-16le yet, do that in win32 specific code */
        /* since lib_name is used in error messages */
        encoding = ERL_FILENAME_UTF8;
    }
    lib_name = erts_convert_filename_to_encoding(BIF_ARG_1, NULL, 0,
                                                 ERTS_ALC_T_TMP, 1, 0, encoding,
						 NULL, 0);
    if (!lib_name) {
	BIF_ERROR(BIF_P, BADARG);
    }

    if (!erts_try_seize_code_write_permission(BIF_P)) {
	erts_free(ERTS_ALC_T_TMP, lib_name);
	ERTS_BIF_YIELD2(bif_export[BIF_load_nif_2],
			BIF_P, BIF_ARG_1, BIF_ARG_2);
    }

    /* Block system (is this the right place to do it?) */
    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
    erts_smp_thr_progress_block();

    /* Find calling module */
    ASSERT(BIF_P->current != NULL);
    ASSERT(BIF_P->current[0] == am_erlang
	   && BIF_P->current[1] == am_load_nif 
	   && BIF_P->current[2] == 2);
    caller = find_function_from_pc(BIF_P->cp);
    ASSERT(caller != NULL);
    mod_atom = caller[0];
    ASSERT(is_atom(mod_atom));
    mod=erts_get_module(mod_atom, erts_active_code_ix());
    ASSERT(mod != NULL);

    mod_atomp = atom_tab(atom_val(mod_atom));
    init_func = erts_static_nif_get_nif_init((char*)mod_atomp->name, mod_atomp->len);
    if (init_func != NULL)
      handle = init_func;

    if (!in_area(caller, mod->curr.code_hdr, mod->curr.code_length)) {
	ASSERT(in_area(caller, mod->old.code_hdr, mod->old.code_length));

	ret = load_nif_error(BIF_P, "old_code", "Calling load_nif from old "
			     "module '%T' not allowed", mod_atom);
    }    
    else if (init_func == NULL &&
	     (err=erts_sys_ddll_open(lib_name, &handle, &errdesc)) != ERL_DE_NO_ERROR) {
	const char slogan[] = "Failed to load NIF library";
	if (strstr(errdesc.str, lib_name) != NULL) {
	    ret = load_nif_error(BIF_P, "load_failed", "%s: '%s'", slogan, errdesc.str);
	}
	else {
	    ret = load_nif_error(BIF_P, "load_failed", "%s %s: '%s'", slogan, lib_name, errdesc.str);
	}
    }
    else if (init_func == NULL &&
	     erts_sys_ddll_load_nif_init(handle, &init_func, &errdesc) != ERL_DE_NO_ERROR) {
	ret  = load_nif_error(BIF_P, bad_lib, "Failed to find library init"
			      " function: '%s'", errdesc.str);
	
    }
    else if ((add_taint(mod_atom),
	      (entry = erts_sys_ddll_call_nif_init(init_func)) == NULL)) {
	ret = load_nif_error(BIF_P, bad_lib, "Library init-call unsuccessful");
    }
    else if (entry->major < ERL_NIF_MIN_REQUIRED_MAJOR_VERSION_ON_LOAD
	     || (ERL_NIF_MAJOR_VERSION < entry->major
		 || (ERL_NIF_MAJOR_VERSION == entry->major
		     && ERL_NIF_MINOR_VERSION < entry->minor))
	     || (entry->major==2 && entry->minor == 5)) { /* experimental maps */
	
	ret = load_nif_error(BIF_P, bad_lib, "Library version (%d.%d) not compatible (with %d.%d).",
			     entry->major, entry->minor, ERL_NIF_MAJOR_VERSION, ERL_NIF_MINOR_VERSION);
    }   
    else if (entry->minor >= 1
	     && sys_strcmp(entry->vm_variant, ERL_NIF_VM_VARIANT) != 0) {
	ret = load_nif_error(BIF_P, bad_lib, "Library (%s) not compiled for "
			     "this vm variant (%s).",
			     entry->vm_variant, ERL_NIF_VM_VARIANT);
    }
    else if (!erts_is_atom_str((char*)entry->name, mod_atom, 1)) {
	ret = load_nif_error(BIF_P, bad_lib, "Library module name '%s' does not"
			     " match calling module '%T'", entry->name, mod_atom);
    }
    else {
	/*erts_fprintf(stderr, "Found module %T\r\n", mod_atom);*/

	int maybe_dirty_nifs = ((entry->major > 2 || (entry->major == 2 && entry->minor >= 7))
				&& (entry->options & ERL_NIF_DIRTY_NIF_OPTION));
	int incr = 0;
	ErlNifFunc* f = entry->funcs;
	for (i=0; i < entry->num_of_funcs && ret==am_ok; i++) {
	    BeamInstr** code_pp;
	    if (!erts_atom_get(f->name, sys_strlen(f->name), &f_atom, ERTS_ATOM_ENC_LATIN1)
		|| (code_pp = get_func_pp(mod->curr.code_hdr, f_atom, f->arity))==NULL) {
		ret = load_nif_error(BIF_P,bad_lib,"Function not found %T:%s/%u",
				     mod_atom, f->name, f->arity);
	    }
	    else if (maybe_dirty_nifs && f->flags) {
		/*
		 * If the flags field is non-zero and this emulator was
		 * built with dirty scheduler support, check that the flags
		 * value is legal. But if this emulator was built without
		 * dirty scheduler support, treat a non-zero flags field as
		 * a load error.
		 */
#ifdef ERTS_DIRTY_SCHEDULERS
		if (f->flags != ERL_NIF_DIRTY_JOB_IO_BOUND && f->flags != ERL_NIF_DIRTY_JOB_CPU_BOUND)
		    ret = load_nif_error(BIF_P, bad_lib, "Illegal flags field value %d for NIF %T:%s/%u",
					 f->flags, mod_atom, f->name, f->arity);
#else
		ret = load_nif_error(BIF_P, bad_lib, "NIF %T:%s/%u requires a runtime with dirty scheduler support.",
				     mod_atom, f->name, f->arity);
#endif
	    }
#ifdef ERTS_DIRTY_SCHEDULERS
	    else if (code_pp[1] - code_pp[0] < (5+4))
#else
	    else if (code_pp[1] - code_pp[0] < (5+3))
#endif
	    {
		ret = load_nif_error(BIF_P,bad_lib,"No explicit call to load_nif"
				     " in module (%T:%s/%u too small)",
				     mod_atom, f->name, f->arity);
	    }
	    /*erts_fprintf(stderr, "Found NIF %T:%s/%u\r\n",
	      mod_atom, f->name, f->arity);*/
	    f = next_func(entry, &incr, f);
	}
    }

    if (ret != am_ok) {
	goto error;
    }

    /* Call load, reload or upgrade:
     */


    lib = erts_alloc(ERTS_ALC_T_NIF, sizeof(struct erl_module_nif));
    lib->handle = handle;
    lib->entry = entry;
    erts_refc_init(&lib->rt_cnt, 0);
    erts_refc_init(&lib->rt_dtor_cnt, 0);
    ASSERT(opened_rt_list == NULL);
    lib->mod = mod;
    env.mod_nif = lib;
    if (mod->curr.nif != NULL) { /*************** Reload ******************/
	/*
	 * Repeated load_nif calls from same Erlang module instance ("reload")
	 * is deprecated and was only ment as a development feature not to
	 * be used in production systems. (See warning below)
	 */
	int k, old_incr = 0;
	ErlNifFunc* old_func;
        lib->priv_data = mod->curr.nif->priv_data;

	ASSERT(mod->curr.nif->entry != NULL);
	if (entry->reload == NULL) {
	    ret = load_nif_error(BIF_P,reload,"Reload not supported by this NIF library.");
	    goto error;
	}
	/* Check that no NIF is removed */
	old_func = mod->curr.nif->entry->funcs;
	for (k=0; k < mod->curr.nif->entry->num_of_funcs; k++) {
	    int incr = 0;
	    ErlNifFunc* f = entry->funcs;
	    for (i=0; i < entry->num_of_funcs; i++) {
		if (old_func->arity == f->arity
		    && sys_strcmp(old_func->name, f->name) == 0) {
		    break;
		}
		f = next_func(entry, &incr, f);
	    }
	    if (i == entry->num_of_funcs) {
		ret = load_nif_error(BIF_P,reload,"Reloaded library missing "
				     "function %T:%s/%u\r\n", mod_atom,
				     old_func->name, old_func->arity);
		goto error;
	    }
	    old_func = next_func(mod->curr.nif->entry, &old_incr, old_func);
	}
	erts_pre_nif(&env, BIF_P, lib);
	veto = entry->reload(&env, &lib->priv_data, BIF_ARG_2);
	erts_post_nif(&env);
	if (veto) {
	    ret = load_nif_error(BIF_P, reload, "Library reload-call unsuccessful.");
	}
	else {
	    commit_opened_resource_types(lib);
	    mod->curr.nif->entry = NULL; /* to prevent 'unload' callback */
	    erts_unload_nif(mod->curr.nif);
	    reload_warning = 1;
	}
    }
    else {
	lib->priv_data = NULL;
	if (mod->old.nif != NULL) { /**************** Upgrade ***************/
	    void* prev_old_data = mod->old.nif->priv_data;
	    if (entry->upgrade == NULL) {
		ret = load_nif_error(BIF_P, upgrade, "Upgrade not supported by this NIF library.");
		goto error;
	    }
	    erts_pre_nif(&env, BIF_P, lib);
	    veto = entry->upgrade(&env, &lib->priv_data, &mod->old.nif->priv_data, BIF_ARG_2);
	    erts_post_nif(&env);
	    if (veto) {
		mod->old.nif->priv_data = prev_old_data;
		ret = load_nif_error(BIF_P, upgrade, "Library upgrade-call unsuccessful.");
	    }
	    else
		commit_opened_resource_types(lib);
	}
	else if (entry->load != NULL) { /********* Initial load ***********/
	    erts_pre_nif(&env, BIF_P, lib);
	    veto = entry->load(&env, &lib->priv_data, BIF_ARG_2);
	    erts_post_nif(&env);
	    if (veto) {
		ret = load_nif_error(BIF_P, "load", "Library load-call unsuccessful.");
	    }
	    else
		commit_opened_resource_types(lib);
	}
    }
    if (ret == am_ok) {
	/*
	** Everything ok, patch the beam code with op_call_nif
	*/

	int incr = 0;
	ErlNifFunc* f = entry->funcs;

	mod->curr.nif = lib;
	for (i=0; i < entry->num_of_funcs; i++)
	{
	    BeamInstr* code_ptr;
	    erts_atom_get(f->name, sys_strlen(f->name), &f_atom, ERTS_ATOM_ENC_LATIN1);
	    code_ptr = *get_func_pp(mod->curr.code_hdr, f_atom, f->arity);

	    if (code_ptr[1] == 0) {
		code_ptr[5+0] = (BeamInstr) BeamOp(op_call_nif);
	    }
	    else { /* Function traced, patch the original instruction word */
		GenericBp* g = (GenericBp *) code_ptr[1];
		ASSERT(code_ptr[5+0] ==
		       (BeamInstr) BeamOp(op_i_generic_breakpoint));
		g->orig_instr = (BeamInstr) BeamOp(op_call_nif);
	    }
	    if ((entry->major > 2 || (entry->major == 2 && entry->minor >= 7))
		&& (entry->options & ERL_NIF_DIRTY_NIF_OPTION) && f->flags) {
#ifdef ERL_NIF_DIRTY_SCHEDULER_SUPPORT
		code_ptr[5+3] = (BeamInstr) f->fptr;
		code_ptr[5+1] = (f->flags == ERL_NIF_DIRTY_JOB_IO_BOUND) ?
		    (BeamInstr) schedule_dirty_io_nif :
		    (BeamInstr) schedule_dirty_cpu_nif;
#endif
	    }
	    else
		code_ptr[5+1] = (BeamInstr) f->fptr;
	    code_ptr[5+2] = (BeamInstr) lib;
	    f = next_func(entry, &incr, f);
	}
    }
    else {
    error:
	rollback_opened_resource_types();
	ASSERT(ret != am_ok);
        if (lib != NULL) {
	    erts_free(ERTS_ALC_T_NIF, lib);
	}
	if (handle != NULL && !erts_is_static_nif(handle)) {
	    erts_sys_ddll_close(handle);
	}
	erts_sys_ddll_free_error(&errdesc);
    }

    erts_smp_thr_progress_unblock();
    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
    erts_release_code_write_permission();
    erts_free(ERTS_ALC_T_TMP, lib_name);

    if (reload_warning) {
	erts_dsprintf_buf_t* dsbufp = erts_create_logger_dsbuf();
	erts_dsprintf(dsbufp,
		      "Repeated calls to erlang:load_nif from module '%T'.\n\n"
		      "The NIF reload mechanism is deprecated and must not "
		      "be used in production systems.\n", mod_atom);
	erts_send_warning_to_logger(BIF_P->group_leader, dsbufp);
    }
    BIF_RET(ret);
}


void
erts_unload_nif(struct erl_module_nif* lib)
{
    ErlNifResourceType* rt;
    ErlNifResourceType* next;
    ASSERT(erts_smp_thr_progress_is_blocking());
    ASSERT(lib != NULL);
    ASSERT(lib->mod != NULL);
    for (rt = resource_type_list.next;
	 rt != &resource_type_list;
	 rt = next) {

	next = rt->next;
	if (rt->owner == lib) {
	    rt->next->prev = rt->prev;
	    rt->prev->next = rt->next;
	    rt->next = NULL;
	    rt->prev = NULL;
	    if (erts_refc_dectest(&rt->refc, 0) == 0) {
		if (rt->dtor != NULL) {
		    erts_refc_dec(&lib->rt_dtor_cnt, 0);
		}
		erts_refc_dec(&lib->rt_cnt, 0);
		erts_free(ERTS_ALC_T_NIF, rt);
	    }
	}
    }
    if (erts_refc_read(&lib->rt_dtor_cnt, 0) == 0) {
	close_lib(lib);
	if (erts_refc_read(&lib->rt_cnt, 0) == 0) {
	    erts_free(ERTS_ALC_T_NIF, lib);
	    return;
	}
    }
    else {
	ASSERT(erts_refc_read(&lib->rt_cnt, 1) > 0);
    }
    lib->mod = NULL;   /* orphan lib */
}	

void erl_nif_init()
{
    ERTS_CT_ASSERT((offsetof(ErlNifResource,data) % 8) == ERTS_MAGIC_BIN_BYTES_TO_ALIGN);

    resource_type_list.next = &resource_type_list;
    resource_type_list.prev = &resource_type_list;
    resource_type_list.dtor = NULL;
    resource_type_list.owner = NULL;
    resource_type_list.module = THE_NON_VALUE;
    resource_type_list.name = THE_NON_VALUE;
}

int erts_nif_get_funcs(struct erl_module_nif* mod,
                       ErlNifFunc **funcs)
{
    *funcs = mod->entry->funcs;
    return mod->entry->num_of_funcs;
}

Eterm erts_nif_call_function(Process *p, struct erl_module_nif* mod,
                             ErlNifFunc *fun, int argc, Eterm *argv)
{
    Eterm nif_result;
#ifdef DEBUG
    /* Verify that function is part of this module */
    int i;
    for (i = 0; i < mod->entry->num_of_funcs; i++)
        if (fun == mod->entry->funcs+i)
            break;
    ASSERT(i < mod->entry->num_of_funcs);
    if (p)
        ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(p) & ERTS_PROC_LOCK_MAIN);
#endif
    if (p) {
        struct enif_environment_t env;
        ASSERT(is_internal_pid(p->common.id));
        erts_pre_nif(&env, p, mod);
        env.may_delay_enif_send = 1;
        nif_result = (*fun->fptr)(&env, argc, argv);
        if (env.exception_thrown)
            nif_result = THE_NON_VALUE;
        erts_post_nif(&env);
    } else {
        /* Nif call was done without a process context,
           so we create a phony one. */
        struct enif_msg_environment_t msg_env;
        setup_nif_env(&msg_env, mod);
        msg_env.env.may_delay_enif_send = 1;
        nif_result = (*fun->fptr)(&msg_env.env, argc, argv);
        if (msg_env.env.exception_thrown)
            nif_result = THE_NON_VALUE;
        enif_clear_env(&msg_env.env);
    }

    return nif_result;
}

#ifdef USE_VM_PROBES
void dtrace_nifenv_str(ErlNifEnv *env, char *process_buf)
{
    dtrace_pid_str(env->proc->common.id, process_buf);
}
#endif

#ifdef READONLY_CHECK
/* Use checksums to assert that NIFs do not write into inspected binaries
*/
static void readonly_check_dtor(struct enif_tmp_obj_t*);
static unsigned calc_checksum(unsigned char* ptr, unsigned size);

struct readonly_check_t
{
    struct enif_tmp_obj_t hdr;
    unsigned char* ptr;
    unsigned size;
    unsigned checksum;
};
static void add_readonly_check(ErlNifEnv* env, unsigned char* ptr, unsigned sz)
{
    ErtsAlcType_t allocator = is_proc_bound(env) ? ERTS_ALC_T_TMP : ERTS_ALC_T_NIF;
    struct readonly_check_t* obj = erts_alloc(allocator, 
					      sizeof(struct readonly_check_t));
    obj->hdr.allocator = allocator;
    obj->hdr.next = env->tmp_obj_list;
    env->tmp_obj_list = &obj->hdr;
    obj->hdr.dtor = &readonly_check_dtor;
    obj->ptr = ptr;
    obj->size = sz;
    obj->checksum = calc_checksum(ptr, sz);    
}
static void readonly_check_dtor(struct enif_tmp_obj_t* o)
{
    struct readonly_check_t* obj = (struct readonly_check_t*) o;
    unsigned chksum = calc_checksum(obj->ptr, obj->size);
    if (chksum != obj->checksum) { 
	fprintf(stderr, "\r\nReadonly data written by NIF, checksums differ"
		" %x != %x\r\nABORTING\r\n", chksum, obj->checksum);
	abort();
    }
    erts_free(obj->hdr.allocator,  obj);
}
static unsigned calc_checksum(unsigned char* ptr, unsigned size)
{
    unsigned i, sum = 0;
    for (i=0; i<size; i++) {
	sum ^= ptr[i] << ((i % 4)*8);
    }
    return sum;
}

#endif /* READONLY_CHECK */

#ifdef HAVE_USE_DTRACE

#define MESSAGE_BUFSIZ 1024

static void get_string_maybe(ErlNifEnv *env, const ERL_NIF_TERM term,
		      char **ptr, char *buf, int bufsiz)
{
    ErlNifBinary str_bin;

    if (!enif_inspect_iolist_as_binary(env, term, &str_bin) ||
        str_bin.size > bufsiz) {
        *ptr = NULL;
    } else {
        memcpy(buf, (char *) str_bin.data, str_bin.size);
        buf[str_bin.size] = '\0';
        *ptr = buf;
    }
}

ERL_NIF_TERM erl_nif_user_trace_s1(ErlNifEnv* env, int argc,
                                   const ERL_NIF_TERM argv[])
{
    ErlNifBinary message_bin;
    DTRACE_CHARBUF(messagebuf, MESSAGE_BUFSIZ + 1);

    if (DTRACE_ENABLED(user_trace_s1)) {
	if (!enif_inspect_iolist_as_binary(env, argv[0], &message_bin) ||
	    message_bin.size > MESSAGE_BUFSIZ) {
	    return am_badarg;
	}
	memcpy(messagebuf, (char *) message_bin.data, message_bin.size);
        messagebuf[message_bin.size] = '\0';
	DTRACE1(user_trace_s1, messagebuf);
	return am_true;
    } else {
	return am_false;
    }
}

ERL_NIF_TERM erl_nif_user_trace_i4s4(ErlNifEnv* env, int argc,
                                     const ERL_NIF_TERM argv[])
{
    DTRACE_CHARBUF(procbuf, 32 + 1);
    DTRACE_CHARBUF(user_tagbuf, MESSAGE_BUFSIZ + 1);
    char *utbuf = NULL;
    ErlNifSInt64 i1, i2, i3, i4;
    DTRACE_CHARBUF(messagebuf1, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf2, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf3, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf4, MESSAGE_BUFSIZ + 1);
    char *mbuf1 = NULL, *mbuf2 = NULL, *mbuf3 = NULL, *mbuf4 = NULL;
    
    if (DTRACE_ENABLED(user_trace_i4s4)) {
	dtrace_nifenv_str(env, procbuf);
        get_string_maybe(env, argv[0], &utbuf, user_tagbuf, MESSAGE_BUFSIZ);
        if (! enif_get_int64(env, argv[1], &i1))
            i1 = 0;
        if (! enif_get_int64(env, argv[2], &i2))
            i2 = 0;
        if (! enif_get_int64(env, argv[3], &i3))
            i3 = 0;
        if (! enif_get_int64(env, argv[4], &i4))
            i4 = 0;
        get_string_maybe(env, argv[5], &mbuf1, messagebuf1, MESSAGE_BUFSIZ);
        get_string_maybe(env, argv[6], &mbuf2, messagebuf2, MESSAGE_BUFSIZ);
        get_string_maybe(env, argv[7], &mbuf3, messagebuf3, MESSAGE_BUFSIZ);
        get_string_maybe(env, argv[8], &mbuf4, messagebuf4, MESSAGE_BUFSIZ);
	DTRACE10(user_trace_i4s4, procbuf, utbuf,
		 i1, i2, i3, i4, mbuf1, mbuf2, mbuf3, mbuf4);
	return am_true;
    } else {
	return am_false;
    }
}

#define DTRACE10_LABEL(name, label, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) \
    erlang_##name##label((a0), (a1), (a2), (a3), (a4), (a5), (a6), (a7), (a8), (a9))
#define N_STATEMENT(the_label) \
   case the_label: \
      if (DTRACE_ENABLED(user_trace_n##the_label)) { \
          dtrace_nifenv_str(env, procbuf); \
          get_string_maybe(env, argv[1], &utbuf, user_tagbuf, MESSAGE_BUFSIZ); \
          if (! enif_get_int64(env, argv[2], &i1)) \
              i1 = 0; \
          if (! enif_get_int64(env, argv[3], &i2)) \
              i2 = 0; \
          if (! enif_get_int64(env, argv[4], &i3)) \
              i3 = 0; \
          if (! enif_get_int64(env, argv[5], &i4)) \
              i4 = 0; \
          get_string_maybe(env, argv[6], &mbuf1, messagebuf1, MESSAGE_BUFSIZ); \
          get_string_maybe(env, argv[7], &mbuf2, messagebuf2, MESSAGE_BUFSIZ); \
          get_string_maybe(env, argv[8], &mbuf3, messagebuf3, MESSAGE_BUFSIZ); \
          get_string_maybe(env, argv[9], &mbuf4, messagebuf4, MESSAGE_BUFSIZ); \
          DTRACE10_LABEL(user_trace_n, the_label, procbuf, utbuf,    \
                         i1, i2, i3, i4, mbuf1, mbuf2, mbuf3, mbuf4); \
          return am_true; \
      } else { \
          return am_false; \
      } \
      break

ERL_NIF_TERM erl_nif_user_trace_n(ErlNifEnv* env, int argc,
				  const ERL_NIF_TERM argv[])
{
    DTRACE_CHARBUF(procbuf, 32 + 1);
    DTRACE_CHARBUF(user_tagbuf, MESSAGE_BUFSIZ + 1);
    char *utbuf = NULL;
    ErlNifSInt64 i1, i2, i3, i4;
    DTRACE_CHARBUF(messagebuf1, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf2, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf3, MESSAGE_BUFSIZ + 1);
    DTRACE_CHARBUF(messagebuf4, MESSAGE_BUFSIZ + 1);
    char *mbuf1 = NULL, *mbuf2 = NULL, *mbuf3 = NULL, *mbuf4 = NULL;
    ErlNifSInt64 label = 0;

    if (! enif_get_int64(env, argv[0], &label) || label < 0 || label > 1023) {
	return am_badarg;
    }
    switch (label) {
        N_STATEMENT(0);
        N_STATEMENT(1);
        N_STATEMENT(2);
        N_STATEMENT(3);
        N_STATEMENT(4);
        N_STATEMENT(5);
        N_STATEMENT(6);
        N_STATEMENT(7);
        N_STATEMENT(8);
        N_STATEMENT(9);
        N_STATEMENT(10);
        N_STATEMENT(11);
        N_STATEMENT(12);
        N_STATEMENT(13);
        N_STATEMENT(14);
        N_STATEMENT(15);
        N_STATEMENT(16);
        N_STATEMENT(17);
        N_STATEMENT(18);
        N_STATEMENT(19);
        N_STATEMENT(20);
        N_STATEMENT(21);
        N_STATEMENT(22);
        N_STATEMENT(23);
        N_STATEMENT(24);
        N_STATEMENT(25);
        N_STATEMENT(26);
        N_STATEMENT(27);
        N_STATEMENT(28);
        N_STATEMENT(29);
        N_STATEMENT(30);
        N_STATEMENT(31);
        N_STATEMENT(32);
        N_STATEMENT(33);
        N_STATEMENT(34);
        N_STATEMENT(35);
        N_STATEMENT(36);
        N_STATEMENT(37);
        N_STATEMENT(38);
        N_STATEMENT(39);
        N_STATEMENT(40);
        N_STATEMENT(41);
        N_STATEMENT(42);
        N_STATEMENT(43);
        N_STATEMENT(44);
        N_STATEMENT(45);
        N_STATEMENT(46);
        N_STATEMENT(47);
        N_STATEMENT(48);
        N_STATEMENT(49);
        N_STATEMENT(50);
        N_STATEMENT(51);
        N_STATEMENT(52);
        N_STATEMENT(53);
        N_STATEMENT(54);
        N_STATEMENT(55);
        N_STATEMENT(56);
        N_STATEMENT(57);
        N_STATEMENT(58);
        N_STATEMENT(59);
        N_STATEMENT(60);
        N_STATEMENT(61);
        N_STATEMENT(62);
        N_STATEMENT(63);
        N_STATEMENT(64);
        N_STATEMENT(65);
        N_STATEMENT(66);
        N_STATEMENT(67);
        N_STATEMENT(68);
        N_STATEMENT(69);
        N_STATEMENT(70);
        N_STATEMENT(71);
        N_STATEMENT(72);
        N_STATEMENT(73);
        N_STATEMENT(74);
        N_STATEMENT(75);
        N_STATEMENT(76);
        N_STATEMENT(77);
        N_STATEMENT(78);
        N_STATEMENT(79);
        N_STATEMENT(80);
        N_STATEMENT(81);
        N_STATEMENT(82);
        N_STATEMENT(83);
        N_STATEMENT(84);
        N_STATEMENT(85);
        N_STATEMENT(86);
        N_STATEMENT(87);
        N_STATEMENT(88);
        N_STATEMENT(89);
        N_STATEMENT(90);
        N_STATEMENT(91);
        N_STATEMENT(92);
        N_STATEMENT(93);
        N_STATEMENT(94);
        N_STATEMENT(95);
        N_STATEMENT(96);
        N_STATEMENT(97);
        N_STATEMENT(98);
        N_STATEMENT(99);
        N_STATEMENT(100);
        N_STATEMENT(101);
        N_STATEMENT(102);
        N_STATEMENT(103);
        N_STATEMENT(104);
        N_STATEMENT(105);
        N_STATEMENT(106);
        N_STATEMENT(107);
        N_STATEMENT(108);
        N_STATEMENT(109);
        N_STATEMENT(110);
        N_STATEMENT(111);
        N_STATEMENT(112);
        N_STATEMENT(113);
        N_STATEMENT(114);
        N_STATEMENT(115);
        N_STATEMENT(116);
        N_STATEMENT(117);
        N_STATEMENT(118);
        N_STATEMENT(119);
        N_STATEMENT(120);
        N_STATEMENT(121);
        N_STATEMENT(122);
        N_STATEMENT(123);
        N_STATEMENT(124);
        N_STATEMENT(125);
        N_STATEMENT(126);
        N_STATEMENT(127);
        N_STATEMENT(128);
        N_STATEMENT(129);
        N_STATEMENT(130);
        N_STATEMENT(131);
        N_STATEMENT(132);
        N_STATEMENT(133);
        N_STATEMENT(134);
        N_STATEMENT(135);
        N_STATEMENT(136);
        N_STATEMENT(137);
        N_STATEMENT(138);
        N_STATEMENT(139);
        N_STATEMENT(140);
        N_STATEMENT(141);
        N_STATEMENT(142);
        N_STATEMENT(143);
        N_STATEMENT(144);
        N_STATEMENT(145);
        N_STATEMENT(146);
        N_STATEMENT(147);
        N_STATEMENT(148);
        N_STATEMENT(149);
        N_STATEMENT(150);
        N_STATEMENT(151);
        N_STATEMENT(152);
        N_STATEMENT(153);
        N_STATEMENT(154);
        N_STATEMENT(155);
        N_STATEMENT(156);
        N_STATEMENT(157);
        N_STATEMENT(158);
        N_STATEMENT(159);
        N_STATEMENT(160);
        N_STATEMENT(161);
        N_STATEMENT(162);
        N_STATEMENT(163);
        N_STATEMENT(164);
        N_STATEMENT(165);
        N_STATEMENT(166);
        N_STATEMENT(167);
        N_STATEMENT(168);
        N_STATEMENT(169);
        N_STATEMENT(170);
        N_STATEMENT(171);
        N_STATEMENT(172);
        N_STATEMENT(173);
        N_STATEMENT(174);
        N_STATEMENT(175);
        N_STATEMENT(176);
        N_STATEMENT(177);
        N_STATEMENT(178);
        N_STATEMENT(179);
        N_STATEMENT(180);
        N_STATEMENT(181);
        N_STATEMENT(182);
        N_STATEMENT(183);
        N_STATEMENT(184);
        N_STATEMENT(185);
        N_STATEMENT(186);
        N_STATEMENT(187);
        N_STATEMENT(188);
        N_STATEMENT(189);
        N_STATEMENT(190);
        N_STATEMENT(191);
        N_STATEMENT(192);
        N_STATEMENT(193);
        N_STATEMENT(194);
        N_STATEMENT(195);
        N_STATEMENT(196);
        N_STATEMENT(197);
        N_STATEMENT(198);
        N_STATEMENT(199);
        N_STATEMENT(200);
        N_STATEMENT(201);
        N_STATEMENT(202);
        N_STATEMENT(203);
        N_STATEMENT(204);
        N_STATEMENT(205);
        N_STATEMENT(206);
        N_STATEMENT(207);
        N_STATEMENT(208);
        N_STATEMENT(209);
        N_STATEMENT(210);
        N_STATEMENT(211);
        N_STATEMENT(212);
        N_STATEMENT(213);
        N_STATEMENT(214);
        N_STATEMENT(215);
        N_STATEMENT(216);
        N_STATEMENT(217);
        N_STATEMENT(218);
        N_STATEMENT(219);
        N_STATEMENT(220);
        N_STATEMENT(221);
        N_STATEMENT(222);
        N_STATEMENT(223);
        N_STATEMENT(224);
        N_STATEMENT(225);
        N_STATEMENT(226);
        N_STATEMENT(227);
        N_STATEMENT(228);
        N_STATEMENT(229);
        N_STATEMENT(230);
        N_STATEMENT(231);
        N_STATEMENT(232);
        N_STATEMENT(233);
        N_STATEMENT(234);
        N_STATEMENT(235);
        N_STATEMENT(236);
        N_STATEMENT(237);
        N_STATEMENT(238);
        N_STATEMENT(239);
        N_STATEMENT(240);
        N_STATEMENT(241);
        N_STATEMENT(242);
        N_STATEMENT(243);
        N_STATEMENT(244);
        N_STATEMENT(245);
        N_STATEMENT(246);
        N_STATEMENT(247);
        N_STATEMENT(248);
        N_STATEMENT(249);
        N_STATEMENT(250);
        N_STATEMENT(251);
        N_STATEMENT(252);
        N_STATEMENT(253);
        N_STATEMENT(254);
        N_STATEMENT(255);
        N_STATEMENT(256);
        N_STATEMENT(257);
        N_STATEMENT(258);
        N_STATEMENT(259);
        N_STATEMENT(260);
        N_STATEMENT(261);
        N_STATEMENT(262);
        N_STATEMENT(263);
        N_STATEMENT(264);
        N_STATEMENT(265);
        N_STATEMENT(266);
        N_STATEMENT(267);
        N_STATEMENT(268);
        N_STATEMENT(269);
        N_STATEMENT(270);
        N_STATEMENT(271);
        N_STATEMENT(272);
        N_STATEMENT(273);
        N_STATEMENT(274);
        N_STATEMENT(275);
        N_STATEMENT(276);
        N_STATEMENT(277);
        N_STATEMENT(278);
        N_STATEMENT(279);
        N_STATEMENT(280);
        N_STATEMENT(281);
        N_STATEMENT(282);
        N_STATEMENT(283);
        N_STATEMENT(284);
        N_STATEMENT(285);
        N_STATEMENT(286);
        N_STATEMENT(287);
        N_STATEMENT(288);
        N_STATEMENT(289);
        N_STATEMENT(290);
        N_STATEMENT(291);
        N_STATEMENT(292);
        N_STATEMENT(293);
        N_STATEMENT(294);
        N_STATEMENT(295);
        N_STATEMENT(296);
        N_STATEMENT(297);
        N_STATEMENT(298);
        N_STATEMENT(299);
        N_STATEMENT(300);
        N_STATEMENT(301);
        N_STATEMENT(302);
        N_STATEMENT(303);
        N_STATEMENT(304);
        N_STATEMENT(305);
        N_STATEMENT(306);
        N_STATEMENT(307);
        N_STATEMENT(308);
        N_STATEMENT(309);
        N_STATEMENT(310);
        N_STATEMENT(311);
        N_STATEMENT(312);
        N_STATEMENT(313);
        N_STATEMENT(314);
        N_STATEMENT(315);
        N_STATEMENT(316);
        N_STATEMENT(317);
        N_STATEMENT(318);
        N_STATEMENT(319);
        N_STATEMENT(320);
        N_STATEMENT(321);
        N_STATEMENT(322);
        N_STATEMENT(323);
        N_STATEMENT(324);
        N_STATEMENT(325);
        N_STATEMENT(326);
        N_STATEMENT(327);
        N_STATEMENT(328);
        N_STATEMENT(329);
        N_STATEMENT(330);
        N_STATEMENT(331);
        N_STATEMENT(332);
        N_STATEMENT(333);
        N_STATEMENT(334);
        N_STATEMENT(335);
        N_STATEMENT(336);
        N_STATEMENT(337);
        N_STATEMENT(338);
        N_STATEMENT(339);
        N_STATEMENT(340);
        N_STATEMENT(341);
        N_STATEMENT(342);
        N_STATEMENT(343);
        N_STATEMENT(344);
        N_STATEMENT(345);
        N_STATEMENT(346);
        N_STATEMENT(347);
        N_STATEMENT(348);
        N_STATEMENT(349);
        N_STATEMENT(350);
        N_STATEMENT(351);
        N_STATEMENT(352);
        N_STATEMENT(353);
        N_STATEMENT(354);
        N_STATEMENT(355);
        N_STATEMENT(356);
        N_STATEMENT(357);
        N_STATEMENT(358);
        N_STATEMENT(359);
        N_STATEMENT(360);
        N_STATEMENT(361);
        N_STATEMENT(362);
        N_STATEMENT(363);
        N_STATEMENT(364);
        N_STATEMENT(365);
        N_STATEMENT(366);
        N_STATEMENT(367);
        N_STATEMENT(368);
        N_STATEMENT(369);
        N_STATEMENT(370);
        N_STATEMENT(371);
        N_STATEMENT(372);
        N_STATEMENT(373);
        N_STATEMENT(374);
        N_STATEMENT(375);
        N_STATEMENT(376);
        N_STATEMENT(377);
        N_STATEMENT(378);
        N_STATEMENT(379);
        N_STATEMENT(380);
        N_STATEMENT(381);
        N_STATEMENT(382);
        N_STATEMENT(383);
        N_STATEMENT(384);
        N_STATEMENT(385);
        N_STATEMENT(386);
        N_STATEMENT(387);
        N_STATEMENT(388);
        N_STATEMENT(389);
        N_STATEMENT(390);
        N_STATEMENT(391);
        N_STATEMENT(392);
        N_STATEMENT(393);
        N_STATEMENT(394);
        N_STATEMENT(395);
        N_STATEMENT(396);
        N_STATEMENT(397);
        N_STATEMENT(398);
        N_STATEMENT(399);
        N_STATEMENT(400);
        N_STATEMENT(401);
        N_STATEMENT(402);
        N_STATEMENT(403);
        N_STATEMENT(404);
        N_STATEMENT(405);
        N_STATEMENT(406);
        N_STATEMENT(407);
        N_STATEMENT(408);
        N_STATEMENT(409);
        N_STATEMENT(410);
        N_STATEMENT(411);
        N_STATEMENT(412);
        N_STATEMENT(413);
        N_STATEMENT(414);
        N_STATEMENT(415);
        N_STATEMENT(416);
        N_STATEMENT(417);
        N_STATEMENT(418);
        N_STATEMENT(419);
        N_STATEMENT(420);
        N_STATEMENT(421);
        N_STATEMENT(422);
        N_STATEMENT(423);
        N_STATEMENT(424);
        N_STATEMENT(425);
        N_STATEMENT(426);
        N_STATEMENT(427);
        N_STATEMENT(428);
        N_STATEMENT(429);
        N_STATEMENT(430);
        N_STATEMENT(431);
        N_STATEMENT(432);
        N_STATEMENT(433);
        N_STATEMENT(434);
        N_STATEMENT(435);
        N_STATEMENT(436);
        N_STATEMENT(437);
        N_STATEMENT(438);
        N_STATEMENT(439);
        N_STATEMENT(440);
        N_STATEMENT(441);
        N_STATEMENT(442);
        N_STATEMENT(443);
        N_STATEMENT(444);
        N_STATEMENT(445);
        N_STATEMENT(446);
        N_STATEMENT(447);
        N_STATEMENT(448);
        N_STATEMENT(449);
        N_STATEMENT(450);
        N_STATEMENT(451);
        N_STATEMENT(452);
        N_STATEMENT(453);
        N_STATEMENT(454);
        N_STATEMENT(455);
        N_STATEMENT(456);
        N_STATEMENT(457);
        N_STATEMENT(458);
        N_STATEMENT(459);
        N_STATEMENT(460);
        N_STATEMENT(461);
        N_STATEMENT(462);
        N_STATEMENT(463);
        N_STATEMENT(464);
        N_STATEMENT(465);
        N_STATEMENT(466);
        N_STATEMENT(467);
        N_STATEMENT(468);
        N_STATEMENT(469);
        N_STATEMENT(470);
        N_STATEMENT(471);
        N_STATEMENT(472);
        N_STATEMENT(473);
        N_STATEMENT(474);
        N_STATEMENT(475);
        N_STATEMENT(476);
        N_STATEMENT(477);
        N_STATEMENT(478);
        N_STATEMENT(479);
        N_STATEMENT(480);
        N_STATEMENT(481);
        N_STATEMENT(482);
        N_STATEMENT(483);
        N_STATEMENT(484);
        N_STATEMENT(485);
        N_STATEMENT(486);
        N_STATEMENT(487);
        N_STATEMENT(488);
        N_STATEMENT(489);
        N_STATEMENT(490);
        N_STATEMENT(491);
        N_STATEMENT(492);
        N_STATEMENT(493);
        N_STATEMENT(494);
        N_STATEMENT(495);
        N_STATEMENT(496);
        N_STATEMENT(497);
        N_STATEMENT(498);
        N_STATEMENT(499);
        N_STATEMENT(500);
        N_STATEMENT(501);
        N_STATEMENT(502);
        N_STATEMENT(503);
        N_STATEMENT(504);
        N_STATEMENT(505);
        N_STATEMENT(506);
        N_STATEMENT(507);
        N_STATEMENT(508);
        N_STATEMENT(509);
        N_STATEMENT(510);
        N_STATEMENT(511);
        N_STATEMENT(512);
        N_STATEMENT(513);
        N_STATEMENT(514);
        N_STATEMENT(515);
        N_STATEMENT(516);
        N_STATEMENT(517);
        N_STATEMENT(518);
        N_STATEMENT(519);
        N_STATEMENT(520);
        N_STATEMENT(521);
        N_STATEMENT(522);
        N_STATEMENT(523);
        N_STATEMENT(524);
        N_STATEMENT(525);
        N_STATEMENT(526);
        N_STATEMENT(527);
        N_STATEMENT(528);
        N_STATEMENT(529);
        N_STATEMENT(530);
        N_STATEMENT(531);
        N_STATEMENT(532);
        N_STATEMENT(533);
        N_STATEMENT(534);
        N_STATEMENT(535);
        N_STATEMENT(536);
        N_STATEMENT(537);
        N_STATEMENT(538);
        N_STATEMENT(539);
        N_STATEMENT(540);
        N_STATEMENT(541);
        N_STATEMENT(542);
        N_STATEMENT(543);
        N_STATEMENT(544);
        N_STATEMENT(545);
        N_STATEMENT(546);
        N_STATEMENT(547);
        N_STATEMENT(548);
        N_STATEMENT(549);
        N_STATEMENT(550);
        N_STATEMENT(551);
        N_STATEMENT(552);
        N_STATEMENT(553);
        N_STATEMENT(554);
        N_STATEMENT(555);
        N_STATEMENT(556);
        N_STATEMENT(557);
        N_STATEMENT(558);
        N_STATEMENT(559);
        N_STATEMENT(560);
        N_STATEMENT(561);
        N_STATEMENT(562);
        N_STATEMENT(563);
        N_STATEMENT(564);
        N_STATEMENT(565);
        N_STATEMENT(566);
        N_STATEMENT(567);
        N_STATEMENT(568);
        N_STATEMENT(569);
        N_STATEMENT(570);
        N_STATEMENT(571);
        N_STATEMENT(572);
        N_STATEMENT(573);
        N_STATEMENT(574);
        N_STATEMENT(575);
        N_STATEMENT(576);
        N_STATEMENT(577);
        N_STATEMENT(578);
        N_STATEMENT(579);
        N_STATEMENT(580);
        N_STATEMENT(581);
        N_STATEMENT(582);
        N_STATEMENT(583);
        N_STATEMENT(584);
        N_STATEMENT(585);
        N_STATEMENT(586);
        N_STATEMENT(587);
        N_STATEMENT(588);
        N_STATEMENT(589);
        N_STATEMENT(590);
        N_STATEMENT(591);
        N_STATEMENT(592);
        N_STATEMENT(593);
        N_STATEMENT(594);
        N_STATEMENT(595);
        N_STATEMENT(596);
        N_STATEMENT(597);
        N_STATEMENT(598);
        N_STATEMENT(599);
        N_STATEMENT(600);
        N_STATEMENT(601);
        N_STATEMENT(602);
        N_STATEMENT(603);
        N_STATEMENT(604);
        N_STATEMENT(605);
        N_STATEMENT(606);
        N_STATEMENT(607);
        N_STATEMENT(608);
        N_STATEMENT(609);
        N_STATEMENT(610);
        N_STATEMENT(611);
        N_STATEMENT(612);
        N_STATEMENT(613);
        N_STATEMENT(614);
        N_STATEMENT(615);
        N_STATEMENT(616);
        N_STATEMENT(617);
        N_STATEMENT(618);
        N_STATEMENT(619);
        N_STATEMENT(620);
        N_STATEMENT(621);
        N_STATEMENT(622);
        N_STATEMENT(623);
        N_STATEMENT(624);
        N_STATEMENT(625);
        N_STATEMENT(626);
        N_STATEMENT(627);
        N_STATEMENT(628);
        N_STATEMENT(629);
        N_STATEMENT(630);
        N_STATEMENT(631);
        N_STATEMENT(632);
        N_STATEMENT(633);
        N_STATEMENT(634);
        N_STATEMENT(635);
        N_STATEMENT(636);
        N_STATEMENT(637);
        N_STATEMENT(638);
        N_STATEMENT(639);
        N_STATEMENT(640);
        N_STATEMENT(641);
        N_STATEMENT(642);
        N_STATEMENT(643);
        N_STATEMENT(644);
        N_STATEMENT(645);
        N_STATEMENT(646);
        N_STATEMENT(647);
        N_STATEMENT(648);
        N_STATEMENT(649);
        N_STATEMENT(650);
        N_STATEMENT(651);
        N_STATEMENT(652);
        N_STATEMENT(653);
        N_STATEMENT(654);
        N_STATEMENT(655);
        N_STATEMENT(656);
        N_STATEMENT(657);
        N_STATEMENT(658);
        N_STATEMENT(659);
        N_STATEMENT(660);
        N_STATEMENT(661);
        N_STATEMENT(662);
        N_STATEMENT(663);
        N_STATEMENT(664);
        N_STATEMENT(665);
        N_STATEMENT(666);
        N_STATEMENT(667);
        N_STATEMENT(668);
        N_STATEMENT(669);
        N_STATEMENT(670);
        N_STATEMENT(671);
        N_STATEMENT(672);
        N_STATEMENT(673);
        N_STATEMENT(674);
        N_STATEMENT(675);
        N_STATEMENT(676);
        N_STATEMENT(677);
        N_STATEMENT(678);
        N_STATEMENT(679);
        N_STATEMENT(680);
        N_STATEMENT(681);
        N_STATEMENT(682);
        N_STATEMENT(683);
        N_STATEMENT(684);
        N_STATEMENT(685);
        N_STATEMENT(686);
        N_STATEMENT(687);
        N_STATEMENT(688);
        N_STATEMENT(689);
        N_STATEMENT(690);
        N_STATEMENT(691);
        N_STATEMENT(692);
        N_STATEMENT(693);
        N_STATEMENT(694);
        N_STATEMENT(695);
        N_STATEMENT(696);
        N_STATEMENT(697);
        N_STATEMENT(698);
        N_STATEMENT(699);
        N_STATEMENT(700);
        N_STATEMENT(701);
        N_STATEMENT(702);
        N_STATEMENT(703);
        N_STATEMENT(704);
        N_STATEMENT(705);
        N_STATEMENT(706);
        N_STATEMENT(707);
        N_STATEMENT(708);
        N_STATEMENT(709);
        N_STATEMENT(710);
        N_STATEMENT(711);
        N_STATEMENT(712);
        N_STATEMENT(713);
        N_STATEMENT(714);
        N_STATEMENT(715);
        N_STATEMENT(716);
        N_STATEMENT(717);
        N_STATEMENT(718);
        N_STATEMENT(719);
        N_STATEMENT(720);
        N_STATEMENT(721);
        N_STATEMENT(722);
        N_STATEMENT(723);
        N_STATEMENT(724);
        N_STATEMENT(725);
        N_STATEMENT(726);
        N_STATEMENT(727);
        N_STATEMENT(728);
        N_STATEMENT(729);
        N_STATEMENT(730);
        N_STATEMENT(731);
        N_STATEMENT(732);
        N_STATEMENT(733);
        N_STATEMENT(734);
        N_STATEMENT(735);
        N_STATEMENT(736);
        N_STATEMENT(737);
        N_STATEMENT(738);
        N_STATEMENT(739);
        N_STATEMENT(740);
        N_STATEMENT(741);
        N_STATEMENT(742);
        N_STATEMENT(743);
        N_STATEMENT(744);
        N_STATEMENT(745);
        N_STATEMENT(746);
        N_STATEMENT(747);
        N_STATEMENT(748);
        N_STATEMENT(749);
        N_STATEMENT(750);
        N_STATEMENT(751);
        N_STATEMENT(752);
        N_STATEMENT(753);
        N_STATEMENT(754);
        N_STATEMENT(755);
        N_STATEMENT(756);
        N_STATEMENT(757);
        N_STATEMENT(758);
        N_STATEMENT(759);
        N_STATEMENT(760);
        N_STATEMENT(761);
        N_STATEMENT(762);
        N_STATEMENT(763);
        N_STATEMENT(764);
        N_STATEMENT(765);
        N_STATEMENT(766);
        N_STATEMENT(767);
        N_STATEMENT(768);
        N_STATEMENT(769);
        N_STATEMENT(770);
        N_STATEMENT(771);
        N_STATEMENT(772);
        N_STATEMENT(773);
        N_STATEMENT(774);
        N_STATEMENT(775);
        N_STATEMENT(776);
        N_STATEMENT(777);
        N_STATEMENT(778);
        N_STATEMENT(779);
        N_STATEMENT(780);
        N_STATEMENT(781);
        N_STATEMENT(782);
        N_STATEMENT(783);
        N_STATEMENT(784);
        N_STATEMENT(785);
        N_STATEMENT(786);
        N_STATEMENT(787);
        N_STATEMENT(788);
        N_STATEMENT(789);
        N_STATEMENT(790);
        N_STATEMENT(791);
        N_STATEMENT(792);
        N_STATEMENT(793);
        N_STATEMENT(794);
        N_STATEMENT(795);
        N_STATEMENT(796);
        N_STATEMENT(797);
        N_STATEMENT(798);
        N_STATEMENT(799);
        N_STATEMENT(800);
        N_STATEMENT(801);
        N_STATEMENT(802);
        N_STATEMENT(803);
        N_STATEMENT(804);
        N_STATEMENT(805);
        N_STATEMENT(806);
        N_STATEMENT(807);
        N_STATEMENT(808);
        N_STATEMENT(809);
        N_STATEMENT(810);
        N_STATEMENT(811);
        N_STATEMENT(812);
        N_STATEMENT(813);
        N_STATEMENT(814);
        N_STATEMENT(815);
        N_STATEMENT(816);
        N_STATEMENT(817);
        N_STATEMENT(818);
        N_STATEMENT(819);
        N_STATEMENT(820);
        N_STATEMENT(821);
        N_STATEMENT(822);
        N_STATEMENT(823);
        N_STATEMENT(824);
        N_STATEMENT(825);
        N_STATEMENT(826);
        N_STATEMENT(827);
        N_STATEMENT(828);
        N_STATEMENT(829);
        N_STATEMENT(830);
        N_STATEMENT(831);
        N_STATEMENT(832);
        N_STATEMENT(833);
        N_STATEMENT(834);
        N_STATEMENT(835);
        N_STATEMENT(836);
        N_STATEMENT(837);
        N_STATEMENT(838);
        N_STATEMENT(839);
        N_STATEMENT(840);
        N_STATEMENT(841);
        N_STATEMENT(842);
        N_STATEMENT(843);
        N_STATEMENT(844);
        N_STATEMENT(845);
        N_STATEMENT(846);
        N_STATEMENT(847);
        N_STATEMENT(848);
        N_STATEMENT(849);
        N_STATEMENT(850);
        N_STATEMENT(851);
        N_STATEMENT(852);
        N_STATEMENT(853);
        N_STATEMENT(854);
        N_STATEMENT(855);
        N_STATEMENT(856);
        N_STATEMENT(857);
        N_STATEMENT(858);
        N_STATEMENT(859);
        N_STATEMENT(860);
        N_STATEMENT(861);
        N_STATEMENT(862);
        N_STATEMENT(863);
        N_STATEMENT(864);
        N_STATEMENT(865);
        N_STATEMENT(866);
        N_STATEMENT(867);
        N_STATEMENT(868);
        N_STATEMENT(869);
        N_STATEMENT(870);
        N_STATEMENT(871);
        N_STATEMENT(872);
        N_STATEMENT(873);
        N_STATEMENT(874);
        N_STATEMENT(875);
        N_STATEMENT(876);
        N_STATEMENT(877);
        N_STATEMENT(878);
        N_STATEMENT(879);
        N_STATEMENT(880);
        N_STATEMENT(881);
        N_STATEMENT(882);
        N_STATEMENT(883);
        N_STATEMENT(884);
        N_STATEMENT(885);
        N_STATEMENT(886);
        N_STATEMENT(887);
        N_STATEMENT(888);
        N_STATEMENT(889);
        N_STATEMENT(890);
        N_STATEMENT(891);
        N_STATEMENT(892);
        N_STATEMENT(893);
        N_STATEMENT(894);
        N_STATEMENT(895);
        N_STATEMENT(896);
        N_STATEMENT(897);
        N_STATEMENT(898);
        N_STATEMENT(899);
        N_STATEMENT(900);
        N_STATEMENT(901);
        N_STATEMENT(902);
        N_STATEMENT(903);
        N_STATEMENT(904);
        N_STATEMENT(905);
        N_STATEMENT(906);
        N_STATEMENT(907);
        N_STATEMENT(908);
        N_STATEMENT(909);
        N_STATEMENT(910);
        N_STATEMENT(911);
        N_STATEMENT(912);
        N_STATEMENT(913);
        N_STATEMENT(914);
        N_STATEMENT(915);
        N_STATEMENT(916);
        N_STATEMENT(917);
        N_STATEMENT(918);
        N_STATEMENT(919);
        N_STATEMENT(920);
        N_STATEMENT(921);
        N_STATEMENT(922);
        N_STATEMENT(923);
        N_STATEMENT(924);
        N_STATEMENT(925);
        N_STATEMENT(926);
        N_STATEMENT(927);
        N_STATEMENT(928);
        N_STATEMENT(929);
        N_STATEMENT(930);
        N_STATEMENT(931);
        N_STATEMENT(932);
        N_STATEMENT(933);
        N_STATEMENT(934);
        N_STATEMENT(935);
        N_STATEMENT(936);
        N_STATEMENT(937);
        N_STATEMENT(938);
        N_STATEMENT(939);
        N_STATEMENT(940);
        N_STATEMENT(941);
        N_STATEMENT(942);
        N_STATEMENT(943);
        N_STATEMENT(944);
        N_STATEMENT(945);
        N_STATEMENT(946);
        N_STATEMENT(947);
        N_STATEMENT(948);
        N_STATEMENT(949);
        N_STATEMENT(950);
    }
    return am_error;          /* NOTREACHED, shut up the compiler */
}

#endif /* HAVE_USE_DTRACE */