aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/beam/erl_nif.c
blob: 0a5fe026db26daf75068654ba57d59c20aa3fb29 (plain) (tree)
1
2
3
4
5
6
7
8
9
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395

                   
  
                                                        
  


                                                                   
  






                                                                           
  




                          
















                                                                   











                       
                    
                    
                             
                           
                        
                           
                      
                         


                                         


                                                                                 

                   

                                  







                                                                             
                              

                                                                             
                                                                                

                                                             

  

                                                                            

                        
                                                            







                                                                            







                                                                                                  



                                                  
                    
                                            
      
 
                            
                                                                       
 





















                                                             
                                                                  
                                                              

                                                          












                                                                      
                                                                 





                                 
                                           

 
                                                                      
 
                 
                                 
                                                     

                                             

          


                                                              
                                                                        
     
                                                            
                                     


                                                                   


              
                                    
                                                                    







                                                 

                                                                             
 
                           


                                


                                             
                              
                         


                                             


                                       



                                                            
 
                                             
                                                                    
 





                                                                   
     
      
 
 




                                           


                                                             


                                         
                            


                    






                                                           




                                            



                                                   
 












                                                                           
 








                                      
                                                                          
 

                                                         
                                          
                                                              








                                                              
 
 














                                                                                             
                                                              





















                                                                   
                                                                       

                                                                                
                                               


                                                                           
                                             





















                                                                            

              





                                                               
 



                                                   
 


                                           
 

                   
 
 

                                          
                   


                                                           



                                          

                                                           
                   

 

                                                                 
                                     

                                 





                                                        
                 
                                                     
                                                                    


                                                              
                                                                        


     
                                                          
  
                                     
 
                                     






                                                        
                                                                  
                                                                       

     


                                    

 
                             



                                                       
                                          



                                                       
                         



                                   





                             

                                                     

                                         
 
                                                                  

                                 

                                     
                               
                                     
                                             
                                      





                                                     
                                                     

                                 



                                                   


                                               





                                                                              
                                       







                                   













                                                                               

                                                     
                     







                                                                              
                                             
                                           


                       











                                                  
 

                               
                                                                  



















                                                                    

                                                                     
                                           
 
                                              

















                                   
                                                    







                                                
                                                                                


                                                
                                               




                                         
                                                  















                                                        
                                                



                
 

                                                      

                                                                                  
                               
                               

                 
                    
                                 
                  
 

                                           


                                               

                     

          





                                                                     
                                                         




                                                        
                                                      

                                                                            
                                                           

                     
     


                                       
 













                                                                        
            
                                    
                        
                  


                                               
                                  
                                
                                                                       
                                

              
                                                                   











                                                             
                                                              
     
 

                               
                               
 

                                                     
                                           

                                
     


                                                                     
                                                                   





                                                                     
                                                  












                                                  


                                                   
                                                                  

                        










                                                                
                                                            
 
                                                           



                                       
                                                            
             
                      
                
                                                        

                                              
         
     


                                                            
 
     

                                         
                             
                                                   
                                                                    
                                                   
                       
                               
 


             



                                                            




                                                         
              
            
 






                                                                     
 

                                                         
          


                                                             
     

             
                

                                                               
 
                       
                                
 
               

 









                                                                    



                                                       




                                      

                                                               
     
 







                                                                              



























                                                                          



                                                                      



                                                                           








                                                               
                             




                                                           

                                                        
                                           

               
 

                                                                         













                                                                            

 



                                                   




                                                              
 



















                                                         




                                                  









                                                    

                                                        
                                                          

 




                                                     




                                                    

                                                           
                                                                     
 


                                                                          
                                                                                   



                                   
 







                                                           
     
                 
                                                                                    
                                                                                   


                            
                        
                                     



                                           


                                      
                                                  


             

                                                      
                                    




                                                                                
                            
                   









                                                                     
                                      

                 



                                                                     







                                           
                                                    
                                                   

             
 
                                                     






                                                                    



                                                    



                          
                                                       
 








                                                               





                                                        

                                                                

                                                 



             
                                           
 
                               
                                      
                                               
                                 

            
                     
                                  



                        
                                                                

                                                        
                   
                                               
                   


                                
























                                                              




                                                     


                            
                            
                     
 



                                                                      

                                                       


                   

                                                                       


                                          
 
                                                  
 

                              
     
                                 

                       

                      

 
                                           



                       
                                      
 








                               

 
                                                                      
 

                                   
                                                           
                            




                                                                             


                     

 
                                                                              










                            































                                                                               

                                                         
                                         

                             
                                    

                                    
                       




                                                        

                                                                



                                             
                                                                 
                                        
                                                         






                                          
                       
                                                                    
                       
                             


     
                                                                 
                                                   



                                       
            
                    





                                      
      












                                                                    
                                      
 




                                                               
                              

                                    

 
                                                                    
 

                                                


                                 

                                                                      

             
                                       
                                      


                                  

                                                          

                 








                                                                      
 


                                                     
                                    
                                         

                                              










                                                                

                                                           
                                   
                                         

                                             










                                                       
                                    
                                  

                                    






                                      




                                

                                                                 
                                    
                                  

                                    




                                       
                                

               




                                












                                                                        









                             

                                                                   

             
                                  

                                    



                               


             









                                                                            

                                                                   






                                                   


             

                                                 
                                   
                                                                            

                                             



                         
                                                       
 
                                   
                                                                             

                                              





                                                   


                             
                                    
                                              

                                            



                                           
 
 

                                                             


                             
                                    
                                            

                                            



                                               

 



















                                                             

                                                       
              
               
 
                          

                                           



                          


                                                             




                                                                             

                                     
                                                                    

 

                                                                                 
 
                                                                               


                                                                             
                                                                                
 
                                       

                                  
                                                                
 


                                                               


                             






                                      


                                                




               

                                                                                               


                             





                                      
                                                




                           




                                                                      

                                                    






                                                              



                   


                             






                                          
                                          
                                  

                                                   





                        
     

 

                                                                                              


                             





                                      
                            
                              

                                               








                                                                 







                                                                           
                                       
                                                  

 

                                          
                                                     


                                       
                                                         
 

                                     
 


                                                                                 
 
              






                                 
                                          

                            
                


             


















                                                                    

                                                          
                  
 



                                             
          




                                                               




                                                        



                                                            
 




                                                         



                                                                
     

 












































                                                                                       
































                                                                                                                      
                                                                                                                    
 



















                                                                            









                                                       









                                                                      



                                                             


                                                
                                                                       





                                        
                                                           






                                   
                                                       







                                                     
                                    
                                              
                                            
                                                        
                                  
     

                                         
                       

 
                                                         
 



                                                       
                              
                                                              
 


                                               
                              

                                       
 
 








                                                                          
                                         


                                                          






                                                                          
 



                                    
                                            



                                                     


                                             
                                                                   

                                     
                                           
                                   





                                   


          
                                          






                                     



                                                                                     


                                                                                 

                                   






                        
























                                                                                 

















                                                                    

                                             
                                             
























                                                          

                          
                           


















                                                                            
                                                   





                       
                                                






                                                                       
                                                  

                                   

                     
                                                       




                                                     
                                                  




                                   
                                                                               




                                                
                            
                                                              


 
                                              
 
                                         
 
                                                                                
                                              



                                                                

                           
                                 
                                                          


                                                     
                            















                                                                              
                                       
                     
         

                                    
     

                             
                                              
                                                    
                                                 
                                  



                                                 
                                         


                                        
             
 
 
                                                              
                                           



                                                          
                                                                          


                              
                                                                        
 









                                                                   
                              

                                                

                                                                         
                                    

                      
                                                                     



                                        
                           
                                                                    



                                                                        

                                                                                 
                                    

          
                                    







                                                                                   
                                       





















                                                                           
                                                       

                                                        

                                                                                      
                          
                                        



                                            

                                                                                      
                                                                          
                                              
                                        

                                                    




                                                   


                          
                                     
 
                                                   
                                                                   
 
                                                                
                                                                  

                                          
      
                                   

 

                                  
                                                   
                                                                   
 
                                                                
                                                                  


                                          
                                               

 


                                                                                
                                                                  
                                                    

 

                                                          
                                                   
                                                                   
                                                           
                                                                  
                                                                 

 


                                                                     
                                                   
                                                                   
                                      
                                              


                                     
                    






                                                  
                                               

                           

 



                                                                                  
                           


                                        











                                                                                
                                                   
                     
     
                                                                   
                                                            






                                        
                                      
 
                                                   






                                                                                     
 
 






                                                                        
                                                                        




























                                                                                           

                                                       
                  

              

                                      





                                                                 

                                         
 
 
                       
                                         
 


                                                                             


    
                                              
 
                                   

 
                       
                                                          
 
                                          

                                   

 
 





                                                                           
                                                                        




                                                                        
                  

                  

                                      
                      
                                                                 

                                                          
                                          








                                                                         
                     
                  
                  
                    
 

                                      
                      
                                                                 

                                                          






                                                                            


  


                                                                          
   


                                                                        
 
                  
 

                               
 
                                                                                    
 
                                      
 
                                                    




                                                                                
 
                                                                                 

 
                               

                                                                    
 


                    
                    
 









                                                          
 
                                                                     


                                   
 
                                          
               
 
                                                    


                                                                        
 
                                                          
 
 
                   
                                                                                 
 
                                                                                


                   
                                                                                  
 
                                                                                 

 








                                                                         

                    


                        
                                      
 

                                                                     
               







                                             
                                    






                                                          
                                                 














                                                        
                  


            


                                                                            
 
                  
                                       
                  
 




                                                  
 



                                            
                                                  

     


                                                                      
                                                                                    
                                                                               
     
        
                                       
 
                      
                                                    
 



                  
                      
 
                                                        
 


                                     

                           
                                            
                              
                                               

                                              



                                                      
 
 



                                                  
                        

 
                                                                      
 



                                              

                 



                                   




                                              
                                                        
              
                  


                             
                           
                                        


                   
                            







                                     
                          

                 



                                             










                                                            
                     
                       

                 





                                  

 






                                        
                          


                 



                                             










                                                                   
                          


                   
                                                                 
                   
             






                                                          

                                                     


                        

                                                                                     







                                                        


                                                                     



                                   






                                                                                    
                                            



                                                                                  
                                           










                                                                                  
      
            
                              
      




                                                                       






                                                       


                              



                                                                      









                                                                          



                                                                      









                                                                          




                                                                   




















                                                                              
     



                                                                   




















                                                                              
     






                                                       


















                                                                                                                               



             





                                                                                
                                   




                                                                            
                                                          










                                                 



                                                            





                                       


                                                               






                                                                                      

                                              
 

                               









                                                                                   
            
                                                               
      


                             
                                        



                                                              
                                                          


                                           

                                                        
                                         


                                                          
                                               





                                        



                                                   




                       
                                                






                                                                  
                                                  
 

                                   

                     
                                              
     
                                           










                                             


                                                        

                                                           
 
 













































































                                                                                    












                                                                              

             

                                                                     
 



                                                                           
 


                                                                    




                                    
                                                   































                                                                                



                                                              










































                                                                              
                                                            









                                                             



                                                                      
                                             























































































































































                                                                                     
















































                                                                                                




                                                      




                                                                             
                                                                                         
 
                                          

                             
                                                  
                                                          


                                         




                











































                                                       
                                                    




                                                              
                                                                        

                    
                                  

 
















                                                                                  

                                                                             










                                   


                                                                  
  
                                                                     
   
                                                                
 















                                                               
     


















                                                                                      




                                                                                

               

 


                                            
                                            
                          
                        
                           

                              
                         
                     
                   
                          
                 
                        


                                                        
                                      

                                        
 





                                                                                    






                                                                                         

                                                                                
                    

                                 
 
                                                       




                                                     
                                                          

                                                 


                                   


                                                      

                                              
                              
                              

                                                                
 
                                             
                                                                                     


                          

                              
                                                                             





                                                                            

                                      
                                     
         
                                    
     
 





                                                                                        






                                                                                                     
     

                                                                                            







                                                                               



                                                                      
                                                                                 


                                                                                                       
        
                                          




                                                                             
                                                                  



                                                                                  







                                                                                
 
                                                               
                                 

                                             
                                                                                           
                                                                                      

                                                                                 
             
                                






                                                                           


                                                                                                         
             

                                                                                      
             
                                                                                 

                                                                       

                                                            
                                             






                       
                            
       
 
                      












                                                                                               
                                                                                                  
         





                                                                        
                                                                                              
         

                       

                                          


                                                              
 
                           

                                               
                                             

                                
 
                                                                                       

                                                                   
 
                                       
                                                          

                                                                             
                                            

                                                                           
             
                           

                                                                        

                                                              

                

                                                  

         
          
          
                                         
                             


                                           
                                                            




                                           

                                               
                                         
                                        
 


                 





                                           
                                            
                        
                             


                            




























                                                        
                                       



                   

                                                     
 



                                                  

                                              
 

 


                                                  

                                   

 

                                                         





                                                                    

                                                 
                  
                                        
          

                                                                          

            
                                                             

                                                               



                                                                  
                                      

                                           
                                       
                                              


                               
                                           


                                          



                                                    











                                                                
                                



                                                       
                                              


                                                  


                                                            
                                  




                      
                    

                                                         
                                                      
 
      
 














                                                                               

                                                                                   
                                                                               
                                   















                                                                            
                                        











                                                                
















































                                                                             



















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                    
/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 2009-2017. 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
 */

/*
 * Environment contains a pointer to currently executing process.
 * In the dirty case this pointer do however not point to the
 * actual process structure of the executing process, but instead
 * a "shadow process structure". This in order to be able to handle
 * heap allocation without the need to acquire the main lock on
 * the process.
 *
 * The dirty process is allowed to allocate on the heap without
 * the main lock, i.e., incrementing htop, but is not allowed to
 * modify mbuf, offheap, etc without the main lock. The dirty
 * process moves mbuf list and offheap list of the shadow process
 * structure into the real structure when the dirty nif call
 * completes.
 */


#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"
#include "erl_utils.h"
#include "erl_io_queue.h"
#undef ERTS_WANT_NFUNC_SCHED_INTERNALS__
#define ERTS_WANT_NFUNC_SCHED_INTERNALS__
#include "erl_nfunc_sched.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 */ 

    ErlNifFunc _funcs_copy_[1];  /* only used for old libs */
};

typedef ERL_NIF_TERM (*NativeFunPtr)(ErlNifEnv*, int, const ERL_NIF_TERM[]);

#ifdef DEBUG
#  define READONLY_CHECK
#  define ERTS_DBG_NIF_NOT_SCHED_MARKER ((void *) (UWord) 1)
#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 ERTS_NIF_ASSERT_IN_ENV
#  define ASSERT_IN_ENV(ENV, TERM, NR, TYPE) dbg_assert_in_env(ENV, TERM, NR, TYPE, __func__)
static void dbg_assert_in_env(ErlNifEnv*, Eterm term, int nr, const char* type, const char* func);
#  include "erl_gc.h"
#else
#  define ASSERT_IN_ENV(ENV, TERM, NR, TYPE)
#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, size_t need, Eterm* hp);

static ERTS_INLINE int
is_scheduler(void)
{
    ErtsSchedulerData *esdp = erts_get_scheduler_data();
    if (!esdp)
	return 0;
    if (ERTS_SCHEDULER_IS_DIRTY(esdp))
	return -1;
    return 1;
}

static ERTS_INLINE void
execution_state(ErlNifEnv *env, Process **c_pp, int *schedp)
{
    if (schedp)
	*schedp = is_scheduler();
    if (c_pp) {
	if (!env || env->proc->common.id == ERTS_INVALID_PID)
	    *c_pp = NULL;
	else {
	    Process *c_p = env->proc;

	    if (!(c_p->static_flags & ERTS_STC_FLG_SHADOW_PROC)) {
		ERTS_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p)
				   & ERTS_PROC_LOCK_MAIN);
	    }
	    else {
		c_p = env->proc->next;
		ASSERT(is_scheduler() < 0);
		ASSERT(c_p && env->proc->common.id == c_p->common.id);
	    }

	    *c_pp = c_p;

	    ASSERT(!(c_p->static_flags & ERTS_STC_FLG_SHADOW_PROC));
	}
    }
}

static ERTS_INLINE Eterm* alloc_heap(ErlNifEnv* env, size_t 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, size_t need, Eterm* hp)
{
    env->hp = hp;
    if (env->heap_frag == NULL) {
	ASSERT(HEAP_LIMIT(env->proc) == env->hp_end);
        ASSERT(env->hp + need > env->hp_end);
	HEAP_TOP(env->proc) = env->hp;
    }
    else {
	Uint usz = env->hp - env->heap_frag->mem;
	env->proc->mbuf_sz += usz - env->heap_frag->used_size;
	env->heap_frag->used_size = usz;
	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, size_t 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,
                  Process* tracee)
{
    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;
    env->tracee = tracee;

    ASSERT(p->common.id != ERTS_INVALID_PID);

#ifdef ERTS_NIF_ASSERT_IN_ENV
    env->dbg_disable_assert_in_env = 0;
#endif
#if defined(DEBUG) && defined(ERTS_DIRTY_SCHEDULERS)
    {
	ErtsSchedulerData *esdp = erts_get_scheduler_data();
	ASSERT(esdp);

	if (!ERTS_SCHEDULER_IS_DIRTY(esdp)) {
	    erts_aint32_t state = erts_atomic32_read_nob(&p->state);

	    ASSERT(p->scheduler_data == esdp);
	    ASSERT((state & (ERTS_PSFLG_RUNNING
			     | ERTS_PSFLG_RUNNING_SYS))
		   && !(state & (ERTS_PSFLG_DIRTY_RUNNING
				 | ERTS_PSFLG_DIRTY_RUNNING_SYS)));
	}
    }
#endif
}

static void full_cache_env(ErlNifEnv *env);
static void cache_env(ErlNifEnv* env);
static void full_flush_env(ErlNifEnv *env);
static void flush_env(ErlNifEnv* env);

/* 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);
    full_flush_env(env);
    free_tmp_objs(env);
    env->exiting = ERTS_PROC_IS_EXITING(env->proc);
}


/*
 * 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 'current' and registers if first time this
 * call is scheduled.
 */

static ERTS_INLINE ERL_NIF_TERM
schedule(ErlNifEnv* env, NativeFunPtr direct_fp, NativeFunPtr indirect_fp,
	 Eterm mod, Eterm func_name, int argc, const ERL_NIF_TERM argv[])
{
    NifExport *ep;
    Process *c_p, *dirty_shadow_proc;

    execution_state(env, &c_p, NULL);
    if (c_p == env->proc)
	dirty_shadow_proc = NULL;
    else
	dirty_shadow_proc = env->proc;

    ERTS_LC_ASSERT(ERTS_PROC_LOCK_MAIN & erts_proc_lc_my_proc_locks(c_p));

    ep = erts_nif_export_schedule(c_p, dirty_shadow_proc,
				  c_p->current,
				  c_p->cp,
				  BeamOpCodeAddr(op_call_nif),
				  direct_fp, indirect_fp,
				  mod, func_name,
				  argc, (const Eterm *) argv);
    if (!ep->m) {
	/* First time this call is scheduled... */
	erts_refc_inc(&env->mod_nif->rt_dtor_cnt, 1);
	ep->m = env->mod_nif;
    }
    return (ERL_NIF_TERM) THE_NON_VALUE;
}


static ERL_NIF_TERM dirty_nif_finalizer(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
static ERL_NIF_TERM dirty_nif_exception(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);

int
erts_call_dirty_nif(ErtsSchedulerData *esdp, Process *c_p, BeamInstr *I, Eterm *reg)
{
    int exiting;
    ERL_NIF_TERM *argv = (ERL_NIF_TERM *) reg;
    NifExport *nep = ERTS_I_BEAM_OP_TO_NIF_EXPORT(I);
    ErtsCodeMFA *codemfa = erts_code_to_codemfa(I);
    NativeFunPtr dirty_nif = (NativeFunPtr) I[1];
    ErlNifEnv env;
    ERL_NIF_TERM result;
#ifdef DEBUG
    erts_aint32_t state = erts_atomic32_read_nob(&c_p->state);

    ASSERT(nep == ERTS_PROC_GET_NIF_TRAP_EXPORT(c_p));

    ASSERT(!c_p->scheduler_data);
    ASSERT((state & ERTS_PSFLG_DIRTY_RUNNING)
	&& !(state & (ERTS_PSFLG_RUNNING|ERTS_PSFLG_RUNNING_SYS)));
    ASSERT(esdp);

    nep->func = ERTS_DBG_NIF_NOT_SCHED_MARKER;
#endif

    erts_pre_nif(&env, c_p, nep->m, NULL);

    env.proc = erts_make_dirty_shadow_proc(esdp, c_p);

    env.proc->freason = EXC_NULL;
    env.proc->fvalue = NIL;
    env.proc->ftrace = NIL;
    env.proc->i = c_p->i;

    ASSERT(ERTS_SCHEDULER_IS_DIRTY(erts_proc_sched_data(c_p)));

    erts_atomic32_read_band_mb(&c_p->state, ~(ERTS_PSFLG_DIRTY_CPU_PROC
						   | ERTS_PSFLG_DIRTY_IO_PROC));

    erts_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN);

    result = (*dirty_nif)(&env, codemfa->arity, argv); /* Call dirty NIF */

    erts_proc_lock(c_p, ERTS_PROC_LOCK_MAIN);

    ASSERT(env.proc->static_flags & ERTS_STC_FLG_SHADOW_PROC);
    ASSERT(env.proc->next == c_p);

    exiting = ERTS_PROC_IS_EXITING(c_p);

    if (!exiting) {
	if (env.exception_thrown) {
	schedule_exception:
	    schedule(&env, dirty_nif_exception, NULL,
		     am_erts_internal, am_dirty_nif_exception,
		     1, &env.proc->fvalue);
	}
	else if (is_value(result)) {
	    schedule(&env, dirty_nif_finalizer, NULL,
		     am_erts_internal, am_dirty_nif_finalizer,
		     1, &result);
	}
	else if (env.proc->freason != TRAP) { /* user returned garbage... */
	    ERTS_DECL_AM(badreturn);
	    (void) enif_raise_exception(&env, AM_badreturn);
	    goto schedule_exception;
	}
	else {
	    /* Rescheduled by dirty NIF call... */
	    ASSERT(nep->func != ERTS_DBG_NIF_NOT_SCHED_MARKER);
	}
	c_p->i = env.proc->i;
	c_p->arity = env.proc->arity;
    }

#ifdef DEBUG
    if (nep->func == ERTS_DBG_NIF_NOT_SCHED_MARKER)
	nep->func = NULL;
#endif

    erts_unblock_fpe(env.fpe_was_unmasked);
    full_flush_env(&env);
    free_tmp_objs(&env);

    return exiting;
}


static void full_flush_env(ErlNifEnv* env)
{
    flush_env(env);
    if (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC)
	/* Dirty nif call using shadow process struct */
	erts_flush_dirty_shadow_proc(env->proc);
}

static void full_cache_env(ErlNifEnv* env)
{    
    if (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC)
	erts_cache_dirty_shadow_proc(env->proc);
    cache_env(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 {
	Uint usz;
	ASSERT(env->hp_end != HEAP_LIMIT(env->proc));
	ASSERT(env->hp_end - env->hp <= env->heap_frag->alloc_size);
	usz = env->hp - env->heap_frag->mem;
	env->proc->mbuf_sz += usz - env->heap_frag->used_size;
	env->heap_frag->used_size = usz;
	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;
};

static ERTS_INLINE void
setup_nif_env(struct enif_msg_environment_t* msg_env,
              struct erl_module_nif* mod,
              Process* tracee)
{
    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 = mod;
    msg_env->env.tmp_obj_list = NULL;
    msg_env->env.proc = &msg_env->phony_proc;
    msg_env->env.exception_thrown = 0;
    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;
    msg_env->env.tracee = tracee;

#ifdef FORCE_HEAP_FRAGS
    msg_env->phony_proc.space_verified = 0;
    msg_env->phony_proc.space_verified_from = NULL;
#endif
#ifdef ERTS_NIF_ASSERT_IN_ENV
    msg_env->env.dbg_disable_assert_in_env = 0;
#endif
}

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));
    setup_nif_env(msg_env, NULL, NULL);
    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 pre_nif_noproc(struct enif_msg_environment_t* msg_env,
                                       struct erl_module_nif* mod,
                                       Process* tracee)
{
    setup_nif_env(msg_env, mod, tracee);
    msg_env->env.fpe_was_unmasked = erts_block_fpe();
}

static ERTS_INLINE void post_nif_noproc(struct enif_msg_environment_t* msg_env)
{
    erts_unblock_fpe(msg_env->env.fpe_was_unmasked);
    enif_clear_env(&msg_env->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);

    free_tmp_objs(env);

    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)));
}

#ifdef DEBUG
static int enif_send_delay = 0;
#define ERTS_FORCE_ENIF_SEND_DELAY() (enif_send_delay++ % 32 == 0)
#else
#ifdef ERTS_PROC_LOCK_OWN_IMPL
#define ERTS_FORCE_ENIF_SEND_DELAY() 0
#else
/*
 * We always schedule messages if we do not use our own
 * process lock implementation, as if we try to do a trylock on
 * a lock that might already be locked by the same thread.
 * And what happens then with different mutex implementations
 * is not always guaranteed.
 */
#define ERTS_FORCE_ENIF_SEND_DELAY() 1
#endif
#endif

int erts_flush_trace_messages(Process *c_p, ErtsProcLocks c_p_locks)
{
    ErlTraceMessageQueue *msgq, **last_msgq;
    int reds = 0;

    /* Only one thread at a time is allowed to flush trace messages,
       so we require the main lock to be held when doing the flush */
    ERTS_CHK_HAVE_ONLY_MAIN_PROC_LOCK(c_p);

    erts_proc_lock(c_p, ERTS_PROC_LOCK_TRACE);

    msgq = c_p->trace_msg_q;

    if (!msgq)
        goto error;

    do {
        Process* rp;
        ErtsProcLocks rp_locks;
        ErtsMessage *first, **last;
        Uint len;

        first = msgq->first;
        last = msgq->last;
        len = msgq->len;
        msgq->first = NULL;
        msgq->last = &msgq->first;
        msgq->len = 0;
        erts_proc_unlock(c_p, ERTS_PROC_LOCK_TRACE);

        ASSERT(len != 0);

        rp = erts_proc_lookup(msgq->receiver);
        if (rp) {
            rp_locks = 0;
            if (rp->common.id == c_p->common.id)
                rp_locks = c_p_locks;
            erts_queue_messages(rp, rp_locks, first, last, len, c_p->common.id);
            if (rp->common.id == c_p->common.id)
                rp_locks &= ~c_p_locks;
            if (rp_locks)
                erts_proc_unlock(rp, rp_locks);
            reds += len;
        } else {
            erts_cleanup_messages(first);
        }
        reds += 1;
        erts_proc_lock(c_p, ERTS_PROC_LOCK_TRACE);
        msgq = msgq->next;
    } while (msgq);

    last_msgq = &c_p->trace_msg_q;

    while (*last_msgq) {
        msgq = *last_msgq;
        if (msgq->len == 0) {
            *last_msgq = msgq->next;
            erts_free(ERTS_ALC_T_TRACE_MSG_QUEUE, msgq);
        } else {
            last_msgq = &msgq->next;
        }
    }

error:
    erts_proc_unlock(c_p, ERTS_PROC_LOCK_TRACE);

    return reds;
}


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;
    ErtsProcLocks lc_locks = 0;
    Process* rp;
    Process* c_p;
    ErtsMessage *mp;
    Eterm receiver = to_pid->pid;
    int scheduler;

    execution_state(env, &c_p, &scheduler);


    if (scheduler > 0) { /* Normal scheduler */
	rp = erts_proc_lookup(receiver);
	if (!rp)
	    return 0;
    }
    else {
	if (c_p) {
	    ASSERT(scheduler < 0); /* Dirty scheduler */
	    if (ERTS_PROC_IS_EXITING(c_p))
		return 0;

	    if (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC) {
		erts_proc_lock(c_p, ERTS_PROC_LOCK_MAIN);
	    }
	}

	rp = erts_pid2proc_opt(c_p, ERTS_PROC_LOCK_MAIN,
			       receiver, rp_locks,
			       ERTS_P2P_FLG_INC_REFC);
	if (!rp) {
	    if (c_p && (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC))
		erts_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN);
	    return 0;
	}
    }

    if (c_p == rp)
	rp_locks = ERTS_PROC_LOCK_MAIN;

    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;
        }
    } else {
        erts_literal_area_t litarea;
	ErlOffHeap *ohp;
        Eterm *hp;
        Uint sz;
        INITIALIZE_LITERAL_PURGE_AREA(litarea);
        sz = size_object_litopt(msg, &litarea);
	if (c_p && !env->tracee) {
	    full_flush_env(env);
	    mp = erts_alloc_message_heap(rp, &rp_locks, sz, &hp, &ohp);
	    full_cache_env(env);
	}
	else {
	    erts_aint_t state = erts_atomic32_read_nob(&rp->state);
	    if (state & ERTS_PSFLG_OFF_HEAP_MSGQ) {
		mp = erts_alloc_message(sz, &hp);
		ohp = sz == 0 ? NULL : &mp->hfrag.off_heap;
	    }
	    else {
		ErlHeapFragment *bp = new_message_buffer(sz);
		mp = erts_alloc_message(0, NULL);
		mp->data.heap_frag = bp;
		hp = bp->mem;
		ohp = &bp->off_heap;
	    }
	}
        msg = copy_struct_litopt(msg, sz, &hp, ohp, &litarea);
    }

    ERL_MESSAGE_TERM(mp) = msg;

    if (!env || !env->tracee) {

        if (c_p && IS_TRACED_FL(c_p, F_TRACE_SEND)) {
	    full_flush_env(env);
            trace_send(c_p, receiver, msg);
	    full_cache_env(env);
	}
    }
    else {
        /* This clause is taken when the nif is called in the context
           of a traced process. We do not know which locks we have
           so we have to do a try lock and if that fails we enqueue
           the message in a special trace message output queue of the
           tracee */
        ErlTraceMessageQueue *msgq;
        Process *t_p = env->tracee;


        erts_proc_lock(t_p, ERTS_PROC_LOCK_TRACE);

        msgq = t_p->trace_msg_q;

        while (msgq != NULL) {
            if (msgq->receiver == receiver) {
                break;
            }
            msgq = msgq->next;
        }

#ifdef ERTS_ENABLE_LOCK_CHECK
        lc_locks = erts_proc_lc_my_proc_locks(rp);
        rp_locks |= lc_locks;
#endif
        if (ERTS_FORCE_ENIF_SEND_DELAY() || msgq ||
            rp_locks & ERTS_PROC_LOCK_MSGQ ||
            erts_proc_trylock(rp, ERTS_PROC_LOCK_MSGQ) == EBUSY) {

            if (!msgq) {
                msgq = erts_alloc(ERTS_ALC_T_TRACE_MSG_QUEUE,
                                  sizeof(ErlTraceMessageQueue));
                msgq->receiver = receiver;
                msgq->first = mp;
                msgq->last = &mp->next;
                msgq->len = 1;

                /* Insert in linked list */
                msgq->next = t_p->trace_msg_q;
                t_p->trace_msg_q = msgq;

                erts_proc_unlock(t_p, ERTS_PROC_LOCK_TRACE);

		erts_schedule_flush_trace_messages(t_p, 0);
            } else {
                msgq->len++;
                *msgq->last = mp;
                msgq->last = &mp->next;
                erts_proc_unlock(t_p, ERTS_PROC_LOCK_TRACE);
            }
            goto done;
        } else {
            erts_proc_unlock(t_p, ERTS_PROC_LOCK_TRACE);
            rp_locks &= ~ERTS_PROC_LOCK_TRACE;
            rp_locks |= ERTS_PROC_LOCK_MSGQ;
        }
    }

    erts_queue_message(rp, rp_locks, mp, msg,
                       c_p ? c_p->common.id : am_undefined);

done:
    if (c_p == rp)
	rp_locks &= ~ERTS_PROC_LOCK_MAIN;
    if (rp_locks & ~lc_locks)
	erts_proc_unlock(rp, rp_locks & ~lc_locks);
    if (c_p && (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC))
	erts_proc_unlock(c_p, ERTS_PROC_LOCK_MAIN);
    if (scheduler <= 0)
	erts_proc_dec_refc(rp);

    return 1;
}

int
enif_port_command(ErlNifEnv *env, const ErlNifPort* to_port,
                  ErlNifEnv *msg_env, ERL_NIF_TERM msg)
{
    int iflags = (erts_port_synchronous_ops
		  ? ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP
		  : ERTS_PORT_SFLGS_INVALID_LOOKUP);
    int scheduler;
    Process *c_p;
    Port *prt;
    int res;

    if (!env)
	erts_exit(ERTS_ABORT_EXIT, "enif_port_command: env == NULL");

    execution_state(env, &c_p, &scheduler);

    if (!c_p)
	c_p = env->proc;

    if (scheduler > 0)
	prt = erts_port_lookup(to_port->port_id, iflags);
    else {
	if (ERTS_PROC_IS_EXITING(c_p))
	    return 0;
	prt = erts_thr_port_lookup(to_port->port_id, iflags);
    }

    if (!prt)
	res = 0;
    else
        res = erts_port_output_async(prt, c_p->common.id, msg);

    if (scheduler <= 0)
	erts_port_dec_refc(prt);

    return res;
}

/*
 *  env must be the caller's environment in a scheduler or NULL in a
 *      non-scheduler thread.
 *  name must be an atom - anything else will just waste time.
 */
static Eterm call_whereis(ErlNifEnv *env, Eterm name)
{
    Process *c_p;
    Eterm res;
    int scheduler;

    execution_state(env, &c_p, &scheduler);
    ASSERT((c_p && scheduler) || (!c_p && !scheduler));

    if (scheduler < 0) {
        /* dirty scheduler */
        if (ERTS_PROC_IS_EXITING(c_p))
            return 0;

        if (env->proc->static_flags & ERTS_STC_FLG_SHADOW_PROC)
            c_p = NULL; /* as we don't have main lock */
    }


    if (c_p) {
         /* main lock may be released below and c_p->htop updated by others */
        flush_env(env);
    }
    res = erts_whereis_name_to_id(c_p, name);
    if (c_p)
        cache_env(env);

    return res;
}

int enif_whereis_pid(ErlNifEnv *env, ERL_NIF_TERM name, ErlNifPid *pid)
{
    Eterm res;

    if (is_not_atom(name))
        return 0;

    res = call_whereis(env, name);
    /* enif_get_local_ functions check the type */
    return enif_get_local_pid(env, res, pid);
}

int enif_whereis_port(ErlNifEnv *env, ERL_NIF_TERM name, ErlNifPort *port)
{
    Eterm res;

    if (is_not_atom(name))
        return 0;

    res = call_whereis(env, name);
    /* enif_get_local_ functions check the type */
    return enif_get_local_port(env, res, port);
}

ERL_NIF_TERM enif_make_copy(ErlNifEnv* dst_env, ERL_NIF_TERM src_term)
{
    Uint sz;
    Eterm* hp;
    /*
     * No preserved sharing allowed as long as literals are also preserved.
     * Process independent environment can not be reached by purge.
     */
    sz = size_object(src_term);
    hp = alloc_heap(dst_env, sz);
    return copy_struct(src_term, sz, &hp, &MSO(dst_env->proc));
}


#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_binary(bin_term)) {
        ProcBin *pb = (ProcBin*) binary_val(bin_term);
        if (pb->thing_word == HEADER_SUB_BIN) {
            ErlSubBin* sb = (ErlSubBin*) pb;
            pb = (ProcBin*) binary_val(sb->orig);
        }
        if (pb->thing_word == HEADER_PROC_BIN && pb->flags)
            erts_emasculate_writable_binary(pb);
    }
    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 */
    }

    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);
        erts_bin_release(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;
    Uint32 flags = 0;

    switch ((Uint32)opts) {
    case 0: break;
    case ERL_NIF_BIN2TERM_SAFE: flags = ERTS_DIST_EXT_BTT_SAFE; break;
    default: 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, flags);

    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;
}

ErlNifUInt64 enif_hash(ErlNifHash type, Eterm term, ErlNifUInt64 salt)
{
    switch (type) {
        case ERL_NIF_INTERNAL_HASH:
            return make_internal_hash(term, (Uint32) salt);
        case ERL_NIF_PHASH2:
            /* It appears that make_hash2 doesn't always react to seasoning
             * as well as it should. Therefore, let's make it ignore the salt
             * value and declare salted uses of phash2 as unsupported.
             */
            return make_hash2(term) & ((1 << 27) - 1);
        default:
            return 0;
    }
}

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->intern.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
    size_t 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, ...)
{
#ifdef ERTS_NIF_ASSERT_IN_ENV
    int nr = 0;
#endif
    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--) {
        Eterm elem = va_arg(ap,Eterm);
        ASSERT_IN_ENV(env, elem, ++nr, "tuple");
	*hp++ = elem;
    }
    va_end(ap);
    return ret;
}

ERL_NIF_TERM enif_make_tuple_from_array(ErlNifEnv* env, const ERL_NIF_TERM arr[], unsigned cnt)
{
#ifdef ERTS_NIF_ASSERT_IN_ENV
    int nr = 0;
#endif
    Eterm* hp = alloc_heap(env,cnt+1);
    Eterm ret = make_tuple(hp);
    const Eterm* src = arr;

    *hp++ = make_arityval(cnt);
    while (cnt--) {
        ASSERT_IN_ENV(env, *src, ++nr, "tuple");
	*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);

    ASSERT_IN_ENV(env, car, 0, "head of list cell");
    ASSERT_IN_ENV(env, cdr, 0, "tail of list cell");
    CAR(hp) = car;
    CDR(hp) = cdr;
    return ret;
}

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

	va_start(ap,cnt);
	while (cnt--) {
            Eterm term = va_arg(ap,Eterm);
	    *last = make_list(hp);
            ASSERT_IN_ENV(env, term, ++nr, "list");
	    *hp = term;
	    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)
{
#ifdef ERTS_NIF_ASSERT_IN_ENV
    int nr = 0;
#endif
    Eterm* hp = alloc_heap(env,cnt*2);
    Eterm ret = make_list(hp);
    Eterm* last = &ret;
    const Eterm* src = arr;

    while (cnt--) {
        Eterm term = *src++;
	*last = make_list(hp);
        ASSERT_IN_ENV(env, term, ++nr, "list");
	*hp = term;
	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, ERTS_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, *hp;

    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_current_process_alive(ErlNifEnv* env)
{
    Process *c_p;
    int scheduler;

    execution_state(env, &c_p, &scheduler);

    if (!c_p)
	erts_exit(ERTS_ABORT_EXIT,
		  "enif_is_current_process_alive: "
                  "Invalid environment");

    if (!scheduler)
	erts_exit(ERTS_ABORT_EXIT, "enif_is_current_process_alive: "
		  "called from non-scheduler thread");

    return !ERTS_PROC_IS_EXITING(c_p);
}

int enif_is_process_alive(ErlNifEnv* env, ErlNifPid *proc)
{
    int scheduler;

    execution_state(env, NULL, &scheduler);

    if (scheduler > 0)
	return !!erts_proc_lookup(proc->pid);
    else {
	Process* rp = erts_pid2proc_opt(NULL, 0, proc->pid, 0,
					ERTS_P2P_FLG_INC_REFC);
	if (rp)
	    erts_proc_dec_refc(rp);
	return !!rp;
    }
}

int enif_is_port_alive(ErlNifEnv *env, ErlNifPort *port)
{
    int scheduler;
    Uint32 iflags = (erts_port_synchronous_ops
		     ? ERTS_PORT_SFLGS_INVALID_DRIVER_LOOKUP
		     : ERTS_PORT_SFLGS_INVALID_LOOKUP);

    execution_state(env, NULL, &scheduler);

    if (scheduler > 0)
	return !!erts_port_lookup(port->port_id, iflags);
    else {
	Port *prt = erts_thr_port_lookup(port->port_id, iflags);
	if (prt)
	    erts_port_dec_refc(prt);
	return !!prt;
    }
}

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;
}    

int enif_snprintf(char *buffer, size_t size, const char* format, ...) 
{ 
    int ret;
    va_list arglist;
    va_start(arglist, format);
    ret = erts_vsnprintf(buffer, size, format, arglist);
    va_end(arglist);
    return ret;
}

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

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

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.unload != NULL) {
	struct enif_msg_environment_t msg_env;
        pre_nif_noproc(&msg_env, lib, NULL);
	lib->entry.unload(&msg_env.env, lib->priv_data);
        post_nif_noproc(&msg_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;
    ErlNifResourceTypeInit new_callbacks;
};
static struct opened_resource_type* opened_rt_list = NULL;

static
ErlNifResourceType* open_resource_type(ErlNifEnv* env,
                                       const char* name_str,
                                       const ErlNifResourceTypeInit* init,
                                       ErlNifResourceFlags flags,
                                       ErlNifResourceFlags* tried,
                                       size_t sizeof_init)
{
    ErlNifResourceType* type = NULL;
    ErlNifResourceFlags op = flags;
    Eterm module_am, name_am;

    ASSERT(erts_thr_progress_is_blocking());
    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;
        sys_memzero(&ort->new_callbacks, sizeof(ErlNifResourceTypeInit));
        ASSERT(sizeof_init > 0 && sizeof_init <= sizeof(ErlNifResourceTypeInit));
        sys_memcpy(&ort->new_callbacks, init, sizeof_init);
	ort->next = opened_rt_list;
	opened_rt_list = ort;
    }
    if (tried != NULL) {
	*tried = op;
    }
    return type;
}

ErlNifResourceType*
enif_open_resource_type(ErlNifEnv* env,
                        const char* module_str,
                        const char* name_str,
			ErlNifResourceDtor* dtor,
			ErlNifResourceFlags flags,
			ErlNifResourceFlags* tried)
{
    ErlNifResourceTypeInit init =  {dtor, NULL};
    ASSERT(module_str == NULL); /* for now... */
    return open_resource_type(env, name_str, &init, flags, tried,
                              sizeof(init));
}

ErlNifResourceType*
enif_open_resource_type_x(ErlNifEnv* env,
                          const char* name_str,
                          const ErlNifResourceTypeInit* init,
                          ErlNifResourceFlags flags,
                          ErlNifResourceFlags* tried)
{
    return open_resource_type(env, name_str, init, flags, tried,
                              env->mod_nif->entry.sizeof_ErlNifResourceTypeInit);
}

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_callbacks.dtor;
        type->stop = ort->new_callbacks.stop;
        type->down = ort->new_callbacks.down;

	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);
    }
}

struct destroy_monitor_ctx
{
    ErtsResource* resource;
    int exiting_procs;
    int scheduler;
};

static void destroy_one_monitor(ErtsMonitor* mon, void* context)
{
    struct destroy_monitor_ctx* ctx = (struct destroy_monitor_ctx*) context;
    Process* rp;
    ErtsMonitor *rmon = NULL;
    int is_exiting;

    ASSERT(mon->type == MON_ORIGIN);
    ASSERT(is_internal_pid(mon->u.pid));
    ASSERT(is_internal_ref(mon->ref));

    if (ctx->scheduler > 0) { /* Normal scheduler */
        rp = erts_proc_lookup(mon->u.pid);
    }
    else {
        rp = erts_proc_lookup_inc_refc(mon->u.pid);
    }

    if (!rp) {
        is_exiting = 1;
    }
    if (rp) {
        erts_proc_lock(rp, ERTS_PROC_LOCK_LINK);
        if (ERTS_PROC_IS_EXITING(rp)) {
            is_exiting = 1;
        } else {
            rmon = erts_remove_monitor(&ERTS_P_MONITORS(rp), mon->ref);
            ASSERT(rmon);
            is_exiting = 0;
        }
        erts_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
        if (ctx->scheduler <= 0)
            erts_proc_dec_refc(rp);
    }
    if (is_exiting) {
        ctx->resource->monitors->pending_failed_fire++;
    }

    /* ToDo: Delay destruction after monitor_locks */
    if (rmon) {
        ASSERT(rmon->type == MON_NIF_TARGET);
        ASSERT(rmon->u.resource == ctx->resource);
        erts_destroy_monitor(rmon);
    }
    erts_destroy_monitor(mon);
}

static void destroy_all_monitors(ErtsMonitor* monitors, ErtsResource* resource)
{
    struct destroy_monitor_ctx ctx;

    execution_state(NULL, NULL, &ctx.scheduler);

    ctx.resource = resource;
    erts_sweep_monitors(monitors, &destroy_one_monitor, &ctx);
}


#  define NIF_RESOURCE_DTOR &nif_resource_dtor

static int nif_resource_dtor(Binary* bin)
{
    ErtsResource* resource = (ErtsResource*) ERTS_MAGIC_BIN_UNALIGNED_DATA(bin);
    ErlNifResourceType* type = resource->type;
    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == NIF_RESOURCE_DTOR);

    if (resource->monitors) {
        ErtsResourceMonitors* rm = resource->monitors;

        ASSERT(type->down);
        erts_mtx_lock(&rm->lock);
        ASSERT(erts_refc_read(&bin->intern.refc, 0) == 0);
        if (rm->root) {
            ASSERT(!rm->is_dying);
            destroy_all_monitors(rm->root, resource);
            rm->root = NULL;
        }
        if (rm->pending_failed_fire) {
            /*
             * Resource death struggle prolonged to serve exiting process(es).
             * Destructor will be called again when last exiting process
             * tries to fire its MON_NIF_TARGET monitor (and fails).
             *
             * This resource is doomed. It has no "real" references and
             * should get not get called upon to do anything except the
             * final destructor call.
             *
             * We keep refc at 0 and use a separate counter for exiting
             * processes to avoid resource getting revived by "dec_term".
             */
            ASSERT(!rm->is_dying);
            rm->is_dying = 1;
            erts_mtx_unlock(&rm->lock);
            return 0;
        }
        erts_mtx_unlock(&rm->lock);
        erts_mtx_destroy(&rm->lock);
    }

    if (type->dtor != NULL) {
        struct enif_msg_environment_t msg_env;
        pre_nif_noproc(&msg_env, type->owner, NULL);
	type->dtor(&msg_env.env, resource->data);
        post_nif_noproc(&msg_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);
    }
    return 1;
}

void erts_resource_stop(ErtsResource* resource, ErlNifEvent e,
                        int is_direct_call)
{
    struct enif_msg_environment_t msg_env;
    ASSERT(resource->type->stop);
    pre_nif_noproc(&msg_env, resource->type->owner, NULL);
    resource->type->stop(&msg_env.env, resource->data, e, is_direct_call);
    post_nif_noproc(&msg_env);
}

void erts_fire_nif_monitor(ErtsResource* resource, Eterm pid, Eterm ref)
{
    ErtsMonitor* rmon;
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);
    struct enif_msg_environment_t msg_env;
    ErlNifPid nif_pid;
    ErlNifMonitor nif_monitor;
    ErtsResourceMonitors* rmp = resource->monitors;

    ASSERT(rmp);
    ASSERT(resource->type->down);

    erts_mtx_lock(&rmp->lock);
    rmon = erts_remove_monitor(&rmp->root, ref);
    if (!rmon) {
        int free_me = (--rmp->pending_failed_fire == 0) && rmp->is_dying;
        ASSERT(rmp->pending_failed_fire >= 0);
        erts_mtx_unlock(&rmp->lock);

        if (free_me) {
            ASSERT(erts_refc_read(&bin->binary.intern.refc, 0) == 0);
            erts_bin_free(&bin->binary);
        }
        return;
    }
    ASSERT(!rmp->is_dying);
    if (erts_refc_inc_unless(&bin->binary.intern.refc, 0, 0) == 0) {
        /*
         * Racing resource destruction. 
         * To avoid a more complex refc-dance with destructing thread
         * we avoid calling 'down' and just silently remove the monitor.
         * This can happen even for non smp as destructor calls may be scheduled.
         */
        erts_mtx_unlock(&rmp->lock);
    }
    else {
        erts_mtx_unlock(&rmp->lock);

        ASSERT(rmon->u.pid == pid);
        erts_ref_to_driver_monitor(ref, &nif_monitor);
        nif_pid.pid = pid;
        pre_nif_noproc(&msg_env, resource->type->owner, NULL);
        resource->type->down(&msg_env.env, resource->data, &nif_pid, &nif_monitor);
        post_nif_noproc(&msg_env);

        erts_bin_release(&bin->binary);
    }
    erts_destroy_monitor(rmon);
}

void* enif_alloc_resource(ErlNifResourceType* type, size_t data_sz)
{
    size_t magic_sz = offsetof(ErtsResource,data);
    Binary* bin;
    ErtsResource* resource;
    size_t monitors_offs;

    if (type->down) {
        /* Put ErtsResourceMonitors after user data and properly aligned */
        monitors_offs = ((data_sz + ERTS_ALLOC_ALIGN_BYTES - 1)
                         & ~((size_t)ERTS_ALLOC_ALIGN_BYTES - 1));
        magic_sz += monitors_offs + sizeof(ErtsResourceMonitors);
    }
    else {
        ERTS_UNDEF(monitors_offs, 0);
        magic_sz += data_sz;
    }
    bin = erts_create_magic_binary_x(magic_sz, NIF_RESOURCE_DTOR,
                                     ERTS_ALC_T_BINARY,
                                     1); /* unaligned */
    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->intern.refc, 1);
#ifdef DEBUG
    erts_refc_init(&resource->nif_refc, 1);
#endif
    erts_refc_inc(&resource->type->refc, 2);
    if (type->down) {
        resource->monitors = (ErtsResourceMonitors*) (resource->data + monitors_offs);
        erts_mtx_init(&resource->monitors->lock, "resource_monitors", NIL,
            ERTS_LOCK_FLAGS_CATEGORY_GENERIC);
        resource->monitors->root = NULL;
        resource->monitors->pending_failed_fire = 0;
        resource->monitors->is_dying = 0;
        resource->monitors->user_data_sz = data_sz;
    }
    else {
        resource->monitors = NULL;
    }
    return resource->data;
}

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

    ASSERT(ERTS_MAGIC_BIN_DESTRUCTOR(bin) == NIF_RESOURCE_DTOR);
    ASSERT(!(resource->monitors && resource->monitors->is_dying));
#ifdef DEBUG
    erts_refc_dec(&resource->nif_refc, 0);
#endif
    erts_bin_release(&bin->binary);
}

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

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

Eterm erts_bld_resource_ref(Eterm** hpp, ErlOffHeap* oh, ErtsResource* resource)
{
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);
    ASSERT(!(resource->monitors && resource->monitors->is_dying));
    return erts_mk_magic_ref(hpp, oh, &bin->binary);
}

ERL_NIF_TERM enif_make_resource(ErlNifEnv* env, void* obj)
{
    ErtsResource* resource = DATA_TO_RESOURCE(obj);
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);
    Eterm* hp = alloc_heap(env, ERTS_MAGIC_REF_THING_SIZE);
    ASSERT(!(resource->monitors && resource->monitors->is_dying));
    return erts_mk_magic_ref(&hp, &MSO(env->proc), &bin->binary);
}

ERL_NIF_TERM enif_make_resource_binary(ErlNifEnv* env, void* obj,
				       const void* data, size_t size)
{
    ErtsResource* resource = DATA_TO_RESOURCE(obj);
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource);
    ErlOffHeap *ohp = &MSO(env->proc);
    Eterm* hp = alloc_heap(env,PROC_BIN_SIZE);
    ProcBin* pb = (ProcBin *) hp;

    pb->thing_word = HEADER_PROC_BIN;
    pb->size = size;
    pb->next = ohp->first;
    ohp->first = (struct erl_off_heap_header*) pb;
    pb->val = &bin->binary;
    pb->bytes = (byte*) data;
    pb->flags = 0;

    OH_OVERHEAD(ohp, size / sizeof(Eterm));
    erts_refc_inc(&bin->binary.intern.refc, 1);

    return make_binary(hp);
}

int enif_get_resource(ErlNifEnv* env, ERL_NIF_TERM term, ErlNifResourceType* type,
		      void** objp)
{
    Binary* mbin;
    ErtsResource* resource;
    if (is_internal_magic_ref(term))
	mbin = erts_magic_ref2bin(term);
    else {
        Eterm *hp;
        if (!is_binary(term))
            return 0;
        hp = binary_val(term);
        if (thing_subtag(*hp) != REFC_BINARY_SUBTAG)
            return 0;
        /*
        if (((ProcBin *) hp)->size != 0) {	
            return 0; / * Or should we allow "resource binaries" as handles? * /
        }
        */
        mbin = ((ProcBin *) hp)->val;
        if (!(mbin->intern.flags & BIN_FLAG_MAGIC))
            return 0;
    }
    resource = (ErtsResource*) 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)
{
    ErtsResource* resource = DATA_TO_RESOURCE(obj);
    if (resource->monitors) {
        return resource->monitors->user_data_sz;
    }
    else {
        Binary* bin = &ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(resource)->binary;
        return ERTS_MAGIC_BIN_UNALIGNED_DATA_SIZE(bin) - offsetof(ErtsResource,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)
{
    Process *proc;
    Sint reds;

    execution_state(env, &proc, NULL);

    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(proc, reds);
    return ERTS_BIF_REDS_LEFT(proc) == 0;
}

static ERTS_INLINE void
nif_export_cleanup_nif_mod(NifExport *ep)
{
    if (erts_refc_dectest(&ep->m->rt_dtor_cnt, 0) == 0 && ep->m->mod == NULL)
	close_lib(ep->m);
    ep->m = NULL;
}

void
erts_nif_export_cleanup_nif_mod(NifExport *ep)
{
    nif_export_cleanup_nif_mod(ep);
}

static ERTS_INLINE void
nif_export_restore(Process *c_p, NifExport *ep, Eterm res)
{
    erts_nif_export_restore(c_p, ep, res);
    ASSERT(ep->m);
    nif_export_cleanup_nif_mod(ep);
}



/*
 * 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->func 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;
    NifExport* ep;

    execution_state(env, &proc, NULL);

    ASSERT(argc == 1);
    ASSERT(!ERTS_SCHEDULER_IS_DIRTY(erts_proc_sched_data(proc)));
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    nif_export_restore(proc, ep, argv[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[])
{
    ERL_NIF_TERM ret;
    Process* proc;
    NifExport* ep;
    Eterm exception;

    execution_state(env, &proc, NULL);

    ASSERT(argc == 1);
    ASSERT(!ERTS_SCHEDULER_IS_DIRTY(erts_proc_sched_data(proc)));
    ep = (NifExport*) ERTS_PROC_GET_NIF_TRAP_EXPORT(proc);
    ASSERT(ep);
    exception = argv[0]; /* argv overwritten by restore below... */
    nif_export_cleanup_nif_mod(ep);
    ret = enif_raise_exception(env, exception);

    /* Restore orig info for error and clear nif export in handle_error() */
    proc->freason |= EXF_RESTORE_NIF;
    return ret;
}

/*
 * Dirty NIF scheduling wrapper function. Schedule a dirty NIF to execute.
 * 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, NativeFunPtr fp,
		   Eterm func_name, int argc, const ERL_NIF_TERM argv[])
{
    Process* proc;

    ASSERT(is_atom(func_name));
    ASSERT(fp);

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

    execution_state(env, &proc, NULL);

    (void) erts_atomic32_read_bset_nob(&proc->state,
					   (ERTS_PSFLG_DIRTY_CPU_PROC
					    | ERTS_PSFLG_DIRTY_IO_PROC),
					   (flags == ERL_NIF_DIRTY_JOB_CPU_BOUND
					    ? ERTS_PSFLG_DIRTY_CPU_PROC
					    : ERTS_PSFLG_DIRTY_IO_PROC));

    return schedule(env, fp, NULL, proc->current->module, func_name, argc, argv);
}

static ERTS_INLINE ERL_NIF_TERM
static_schedule_dirty_nif(ErlNifEnv* env, erts_aint32_t dirty_psflg,
			     int argc, const ERL_NIF_TERM argv[])
{
    Process *proc;
    NifExport *ep;
    Eterm mod, func;
    NativeFunPtr fp;

    execution_state(env, &proc, NULL);

    /*
     * Called in order to schedule statically determined
     * dirty NIF calls...
     *
     * Note that 'current' does not point into a NifExport
     * structure; only a structure with similar
     * parts (located in code).
     */

    ep = ErtsContainerStruct(proc->current, NifExport, exp.info.mfa);
    mod = proc->current->module;
    func = proc->current->function;
    fp = (NativeFunPtr) ep->func;

    ASSERT(is_atom(mod) && is_atom(func));
    ASSERT(fp);

    (void) erts_atomic32_read_bset_nob(&proc->state,
					   (ERTS_PSFLG_DIRTY_CPU_PROC
					    | ERTS_PSFLG_DIRTY_IO_PROC),
					   dirty_psflg);

    return schedule(env, fp, NULL, mod, func, argc, argv);
}

static ERL_NIF_TERM
static_schedule_dirty_io_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    return static_schedule_dirty_nif(env, ERTS_PSFLG_DIRTY_IO_PROC, argc, argv);
}

static ERL_NIF_TERM
static_schedule_dirty_cpu_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
    return static_schedule_dirty_nif(env, ERTS_PSFLG_DIRTY_CPU_PROC, argc, argv);
}


/*
 * 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;
    NativeFunPtr fp;
    NifExport* ep;
    ERL_NIF_TERM result;

    execution_state(env, &proc, NULL);

    ep = ErtsContainerStruct(proc->current, NifExport, exp.info.mfa);
    fp = ep->func;
    ASSERT(ep);
    ASSERT(!env->exception_thrown);

    fp = (NativeFunPtr) ep->func;

#ifdef DEBUG
    ep->func = ERTS_DBG_NIF_NOT_SCHED_MARKER;
#endif

    result = (*fp)(env, argc, argv);

    ASSERT(ep == ERTS_PROC_GET_NIF_TRAP_EXPORT(proc));

    if (is_value(result) || proc->freason != TRAP) {
	/* Done (not rescheduled)... */
	ASSERT(ep->func == ERTS_DBG_NIF_NOT_SCHED_MARKER);
	if (!env->exception_thrown)
	    nif_export_restore(proc, ep, result);
	else {
	    nif_export_cleanup_nif_mod(ep);
	    /*
	     * Restore orig info for error and clear nif
	     * export in handle_error()
	     */
	    proc->freason |= EXF_RESTORE_NIF;
	}
    }

#ifdef DEBUG
    if (ep->func == ERTS_DBG_NIF_NOT_SCHED_MARKER)
	ep->func = NULL;
#endif

    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;
    ERL_NIF_TERM fun_name_atom, result;
    int scheduler;

    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;

    execution_state(env, &proc, &scheduler);
    if (scheduler <= 0) {
	if (scheduler == 0)
	    enif_make_badarg(env);
	erts_proc_lock(proc, ERTS_PROC_LOCK_MAIN);
    }

    if (flags == 0)
	result = schedule(env, execute_nif, fp, proc->current->module,
			  fun_name_atom, argc, argv);
    else if (!(flags & ~(ERL_NIF_DIRTY_JOB_IO_BOUND|ERL_NIF_DIRTY_JOB_CPU_BOUND))) {
	result = schedule_dirty_nif(env, flags, fp, fun_name_atom, argc, argv);
    }
    else
	result = enif_make_badarg(env);

    if (scheduler < 0)
	erts_proc_unlock(proc, ERTS_PROC_LOCK_MAIN);

    return result;
}

int
enif_thread_type(void)
{
    ErtsSchedulerData *esdp = erts_get_scheduler_data();

    if (!esdp)
	return ERL_NIF_THR_UNDEFINED;

    switch (esdp->type) {
    case ERTS_SCHED_NORMAL:
	return ERL_NIF_THR_NORMAL_SCHEDULER;
    case ERTS_SCHED_DIRTY_CPU:
	return ERL_NIF_THR_DIRTY_CPU_SCHEDULER;
    case ERTS_SCHED_DIRTY_IO:
        return ERL_NIF_THR_DIRTY_IO_SCHEDULER;
    default:
        ERTS_INTERNAL_ERROR("Invalid scheduler type");
	return -1;
    }
}

/* 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;
    }
    ASSERT_IN_ENV(env, map_in, 0, "old map");
    ASSERT_IN_ENV(env, key, 0, "key");
    ASSERT_IN_ENV(env, value, 0, "value");

    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;
    }

    ASSERT_IN_ENV(env, map_in, 0, "old map");
    ASSERT_IN_ENV(env, key, 0, "key");
    ASSERT_IN_ENV(env, value, 0, "value");

    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)
{
    if (!is_map(map_in)) {
	return 0;
    }
    flush_env(env);
    (void) erts_maps_take(env->proc, key, map_in, map_out, NULL);
    cache_env(env);
    return 1;
}

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;
}

int enif_monitor_process(ErlNifEnv* env, void* obj, const ErlNifPid* target_pid,
                         ErlNifMonitor* monitor)
{
    int scheduler;
    ErtsResource* rsrc = DATA_TO_RESOURCE(obj);
    Process *rp;
    Eterm tmp[ERTS_REF_THING_SIZE];
    Eterm ref;
    int retval;

    ASSERT(ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(rsrc)->magic_binary.destructor
           == NIF_RESOURCE_DTOR);
    ASSERT(!(rsrc->monitors && rsrc->monitors->is_dying));
    ASSERT(!rsrc->monitors == !rsrc->type->down);


    if (!rsrc->monitors) {
        ASSERT(!rsrc->type->down);
        return -1;
    }
    ASSERT(rsrc->type->down);

    execution_state(env, NULL, &scheduler);

    if (scheduler > 0) /* Normal scheduler */
        rp = erts_proc_lookup_raw(target_pid->pid);
    else
        rp = erts_proc_lookup_raw_inc_refc(target_pid->pid);

    if (!rp)
        return 1;

    ref = erts_make_ref_in_buffer(tmp);

    erts_mtx_lock(&rsrc->monitors->lock);
    erts_proc_lock(rp, ERTS_PROC_LOCK_LINK);
    if (ERTS_PSFLG_FREE & erts_atomic32_read_nob(&rp->state)) {
        retval = 1;
    }
    else {
        erts_add_monitor(&rsrc->monitors->root, MON_ORIGIN, ref, rp->common.id, NIL);
        erts_add_monitor(&ERTS_P_MONITORS(rp), MON_NIF_TARGET, ref, (UWord)rsrc, NIL);
        retval = 0;
    }
    erts_proc_unlock(rp, ERTS_PROC_LOCK_LINK);
    erts_mtx_unlock(&rsrc->monitors->lock);

    if (scheduler <= 0)
        erts_proc_dec_refc(rp);
    if (monitor)
        erts_ref_to_driver_monitor(ref,monitor);

    return retval;
}

int enif_demonitor_process(ErlNifEnv* env, void* obj, const ErlNifMonitor* monitor)
{
    int scheduler;
    ErtsResource* rsrc = DATA_TO_RESOURCE(obj);
#ifdef DEBUG
    ErtsBinary* bin = ERTS_MAGIC_BIN_FROM_UNALIGNED_DATA(rsrc);
#endif
    Process *rp;
    ErtsMonitor *mon;
    ErtsMonitor *rmon = NULL;
    Eterm ref_heap[ERTS_REF_THING_SIZE];
    Eterm ref;
    int is_exiting;

    ASSERT(bin->magic_binary.destructor == NIF_RESOURCE_DTOR);
    ASSERT(!(rsrc->monitors && rsrc->monitors->is_dying));

    execution_state(env, NULL, &scheduler);

    ref = erts_driver_monitor_to_ref(ref_heap, monitor);

    erts_mtx_lock(&rsrc->monitors->lock);
    mon = erts_remove_monitor(&rsrc->monitors->root, ref);

    if (mon == NULL) {
        erts_mtx_unlock(&rsrc->monitors->lock);
        return 1;
    }

    ASSERT(mon->type == MON_ORIGIN);
    ASSERT(is_internal_pid(mon->u.pid));

    if (scheduler > 0) /* Normal scheduler */
        rp = erts_proc_lookup(mon->u.pid);
    else
        rp = erts_proc_lookup_inc_refc(mon->u.pid);

    if (!rp) {
        is_exiting = 1;
    }
    else {
        erts_proc_lock(rp, ERTS_PROC_LOCK_LINK);
        if (ERTS_PROC_IS_EXITING(rp)) {
            is_exiting = 1;
        } else {
            rmon = erts_remove_monitor(&ERTS_P_MONITORS(rp), ref);
            ASSERT(rmon);
            is_exiting = 0;
        }
        erts_proc_unlock(rp, ERTS_PROC_LOCK_LINK);

        if (scheduler <= 0)
            erts_proc_dec_refc(rp);
    }
    if (is_exiting) {
        rsrc->monitors->pending_failed_fire++;
    }
    erts_mtx_unlock(&rsrc->monitors->lock);

    if (rmon) {
        ASSERT(rmon->type == MON_NIF_TARGET);
        ASSERT(rmon->u.resource == rsrc);
        erts_destroy_monitor(rmon);
    }
    erts_destroy_monitor(mon);

    return 0;
}

int enif_compare_monitors(const ErlNifMonitor *monitor1,
                          const ErlNifMonitor *monitor2)
{
    return sys_memcmp((void *) monitor1, (void *) monitor2,
                      ERTS_REF_THING_SIZE*sizeof(Eterm));
}

ErlNifIOQueue *enif_ioq_create(ErlNifIOQueueOpts opts)
{
    ErlNifIOQueue *q;

    if (opts != ERL_NIF_IOQ_NORMAL)
        return NULL;

    q = enif_alloc(sizeof(ErlNifIOQueue));
    if (!q) return NULL;
    erts_ioq_init(q, ERTS_ALC_T_NIF, 0);

    return q;
}

void enif_ioq_destroy(ErlNifIOQueue *q)
{
    erts_ioq_clear(q);
    enif_free(q);
}

/* If the iovec was preallocated (Stack or otherwise) it needs to be marked as
 * such to perform a proper free. */
#define ERL_NIF_IOVEC_FLAGS_PREALLOC (1 << 0)

void enif_free_iovec(ErlNifIOVec *iov)
{
    int i;
    /* Decrement the refc of all the binaries */
    for (i = 0; i < iov->iovcnt; i++) {
        Binary *bptr = ((Binary**)iov->ref_bins)[i];
        /* bptr can be null if enq_binary was used */
        if (bptr && erts_refc_dectest(&bptr->intern.refc, 0) == 0) {
            erts_bin_free(bptr);
        }
    }

    if (!(iov->flags & ERL_NIF_IOVEC_FLAGS_PREALLOC)) {
        enif_free(iov);
    }
}

typedef struct {
    UWord sublist_length;
    Eterm sublist_start;
    Eterm sublist_end;

    UWord offheap_size;
    UWord onheap_size;

    UWord iovec_len;
} iovec_slice_t;

static int examine_iovec_term(Eterm list, UWord max_length, iovec_slice_t *result) {
    Eterm lookahead;

    result->sublist_start = list;
    result->sublist_length = 0;
    result->offheap_size = 0;
    result->onheap_size = 0;
    result->iovec_len = 0;

    lookahead = result->sublist_start;

    while (is_list(lookahead)) {
        Eterm *binary_header, binary;
        Eterm *cell;
        UWord size;

        cell = list_val(lookahead);
        binary = CAR(cell);

        if (!is_binary(binary)) {
            return 0;
        }

        size = binary_size(binary);
        binary_header = binary_val(binary);

        if (size > 0) {
            /* If we're a sub-binary we'll need to check our underlying binary
             * to determine whether we're on-heap or not. */
            if (thing_subtag(*binary_header) == SUB_BINARY_SUBTAG) {
                ErlSubBin *sb = (ErlSubBin*)binary_header;

                /* Reject bitstrings */
                if((sb->bitoffs + sb->bitsize) > 0) {
                    return 0;
                }

                ASSERT(size <= binary_size(sb->orig));
                binary_header = binary_val(sb->orig);
            }

            if (thing_subtag(*binary_header) == HEAP_BINARY_SUBTAG) {
                ASSERT(size <= ERL_ONHEAP_BIN_LIMIT);

                result->iovec_len += 1;
                result->onheap_size += size;
            } else {
                ASSERT(thing_subtag(*binary_header) == REFC_BINARY_SUBTAG);

                result->iovec_len += 1 + size / MAX_SYSIOVEC_IOVLEN;
                result->offheap_size += size;
            }
        }

        result->sublist_length += 1;
        lookahead = CDR(cell);

        if (result->sublist_length >= max_length) {
            break;
        }
    }

    if (!is_nil(lookahead) && !is_list(lookahead)) {
        return 0;
    }

    result->sublist_end = lookahead;

    return 1;
}

static void inspect_raw_binary_data(Eterm binary, ErlNifBinary *result) {
    Eterm *parent_header;
    Eterm parent_binary;

    int bit_offset, bit_size;
    Uint byte_offset;

    ASSERT(is_binary(binary));

    ERTS_GET_REAL_BIN(binary, parent_binary, byte_offset, bit_offset, bit_size);

    parent_header = binary_val(parent_binary);

    result->size = binary_size(binary);
    result->bin_term = binary;

    if (thing_subtag(*parent_header) == REFC_BINARY_SUBTAG) {
        ProcBin *pb = (ProcBin*)parent_header;

        if (pb->flags & (PB_IS_WRITABLE | PB_ACTIVE_WRITER)) {
            erts_emasculate_writable_binary(pb);
        }

        ASSERT(pb->val != NULL);
        ASSERT(byte_offset < pb->size);
        ASSERT(&pb->bytes[byte_offset] >= (byte*)(pb->val)->orig_bytes);

        result->data = (unsigned char*)&pb->bytes[byte_offset];
        result->ref_bin = (void*)pb->val;
    } else {
        ErlHeapBin *hb = (ErlHeapBin*)parent_header;

        ASSERT(thing_subtag(*parent_header) == HEAP_BINARY_SUBTAG);

        result->data = &((unsigned char*)&hb->data)[byte_offset];
        result->ref_bin = NULL;
    }
}

static int fill_iovec_with_slice(ErlNifEnv *env,
                                 iovec_slice_t *slice,
                                 ErlNifIOVec *iovec) {
    UWord onheap_offset, iovec_idx;
    ErlNifBinary onheap_data;
    Eterm sublist_iterator;

    /* Set up a common refc binary for all on-heap binaries. */
    if (slice->onheap_size > 0) {
        if (!enif_alloc_binary(slice->onheap_size, &onheap_data)) {
            return 0;
        }
    }

    sublist_iterator = slice->sublist_start;
    onheap_offset = 0;
    iovec_idx = 0;

    while (sublist_iterator != slice->sublist_end) {
        ErlNifBinary raw_data;
        Eterm *cell;

        cell = list_val(sublist_iterator);
        inspect_raw_binary_data(CAR(cell), &raw_data);

        /* If this isn't a refc binary, copy its contents to the onheap buffer
         * and reference that instead. */
        if (raw_data.size > 0 && raw_data.ref_bin == NULL) {
            ASSERT(onheap_offset < onheap_data.size);
            ASSERT(slice->onheap_size > 0);

            sys_memcpy(&onheap_data.data[onheap_offset],
                       raw_data.data, raw_data.size);

            raw_data.data = &onheap_data.data[onheap_offset];
            raw_data.ref_bin = onheap_data.ref_bin;
        }

        while (raw_data.size > 0) {
            UWord chunk_len = MIN(raw_data.size, MAX_SYSIOVEC_IOVLEN);

            ASSERT(iovec_idx < iovec->iovcnt);
            ASSERT(raw_data.ref_bin != NULL);

            iovec->iov[iovec_idx].iov_base = raw_data.data;
            iovec->iov[iovec_idx].iov_len = chunk_len;

            iovec->ref_bins[iovec_idx] = raw_data.ref_bin;

            raw_data.data += chunk_len;
            raw_data.size -= chunk_len;

            iovec_idx += 1;
        }

        sublist_iterator = CDR(cell);
    }

    ASSERT(iovec_idx == iovec->iovcnt);

    if (env == NULL) {
        int i;
        for (i = 0; i < iovec->iovcnt; i++) {
            Binary *refc_binary = (Binary*)(iovec->ref_bins[i]);
            erts_refc_inc(&refc_binary->intern.refc, 1);
        }

        if (slice->onheap_size > 0) {
            /* Transfer ownership to the iovec; we've taken references to it in
             * the above loop. */
            enif_release_binary(&onheap_data);
        }
    } else {
        if (slice->onheap_size > 0) {
            /* Attach the binary to our environment and let the GC take care of
             * it after returning. */
            enif_make_binary(env, &onheap_data);
        }
    }

    return 1;
}

static int create_iovec_from_slice(ErlNifEnv *env,
                                   iovec_slice_t *slice,
                                   ErlNifIOVec **result) {
    ErlNifIOVec *iovec = *result;

    if (iovec && slice->iovec_len < ERL_NIF_IOVEC_SIZE) {
        iovec->iov = iovec->small_iov;
        iovec->ref_bins = iovec->small_ref_bin;
        iovec->flags = ERL_NIF_IOVEC_FLAGS_PREALLOC;
    } else {
        UWord iov_offset, binv_offset, alloc_size;
        char *alloc_base;

        iov_offset = ERTS_ALC_DATA_ALIGN_SIZE(sizeof(ErlNifIOVec));
        binv_offset = iov_offset;
        binv_offset += ERTS_ALC_DATA_ALIGN_SIZE(slice->iovec_len * sizeof(SysIOVec));
        alloc_size = binv_offset;
        alloc_size += slice->iovec_len * sizeof(Binary*);

        /* If we have an environment we'll attach the allocated data to it. The
         * GC will take care of releasing it later on. */
        if (env != NULL) {
            ErlNifBinary gc_bin;

            if (!enif_alloc_binary(alloc_size, &gc_bin)) {
                return 0;
            }

            alloc_base = (char*)gc_bin.data;
            enif_make_binary(env, &gc_bin);
        } else {
            alloc_base = enif_alloc(alloc_size);
        }

        iovec = (ErlNifIOVec*)alloc_base;
        iovec->iov = (SysIOVec*)(alloc_base + iov_offset);
        iovec->ref_bins = (void**)(alloc_base + binv_offset);
        iovec->flags = 0;
    }

    iovec->size = slice->offheap_size + slice->onheap_size;
    iovec->iovcnt = slice->iovec_len;

    if(!fill_iovec_with_slice(env, slice, iovec)) {
        if (env == NULL && !(iovec->flags & ERL_NIF_IOVEC_FLAGS_PREALLOC)) {
            enif_free(iovec);
        }

        return 0;
    }

    *result = iovec;

    return 1;
}

int enif_inspect_iovec(ErlNifEnv *env, size_t max_elements,
                       ERL_NIF_TERM list, ERL_NIF_TERM *tail,
                       ErlNifIOVec **iov) {
    iovec_slice_t slice;

    if(!examine_iovec_term(list, max_elements, &slice)) {
        return 0;
    } else if(!create_iovec_from_slice(env, &slice, iov)) {
        return 0;
    }

    (*tail) = slice.sublist_end;

    return 1;
}

/* */
int enif_ioq_enqv(ErlNifIOQueue *q, ErlNifIOVec *iov, size_t skip)
{
    if(skip <= iov->size) {
        return !erts_ioq_enqv(q, (ErtsIOVec*)iov, skip);
    }

    return 0;
}

int enif_ioq_enq_binary(ErlNifIOQueue *q, ErlNifBinary *bin, size_t skip)
{
    ErlNifIOVec vec = {1, bin->size, NULL, NULL, ERL_NIF_IOVEC_FLAGS_PREALLOC };
    Binary *ref_bin = (Binary*)bin->ref_bin;
    int res;
    vec.iov = vec.small_iov;
    vec.ref_bins = vec.small_ref_bin;
    vec.iov[0].iov_base = bin->data;
    vec.iov[0].iov_len = bin->size;
    ((Binary**)(vec.ref_bins))[0] = ref_bin;

    res = enif_ioq_enqv(q, &vec, skip);
    enif_release_binary(bin);
    return res;
}

size_t enif_ioq_size(ErlNifIOQueue *q)
{
    return erts_ioq_size(q);
}

int enif_ioq_deq(ErlNifIOQueue *q, size_t elems, size_t *size)
{
    if (erts_ioq_deq(q, elems) == -1)
        return 0;
    if (size)
        *size = erts_ioq_size(q);
    return 1;
}

int enif_ioq_peek_head(ErlNifEnv *env, ErlNifIOQueue *q, size_t *size, ERL_NIF_TERM *bin_term) {
    SysIOVec *iov_entry;
    Binary *ref_bin;

    if (q->size == 0) {
        return 0;
    }

    ASSERT(q->b_head != q->b_tail && q->v_head != q->v_tail);

    ref_bin = &q->b_head[0]->nif;
    iov_entry = &q->v_head[0];

    if (size != NULL) {
        *size = iov_entry->iov_len;
    }

    if (iov_entry->iov_len > ERL_ONHEAP_BIN_LIMIT) {
        ProcBin *pb = (ProcBin*)alloc_heap(env, PROC_BIN_SIZE);

        pb->thing_word = HEADER_PROC_BIN;
        pb->next = MSO(env->proc).first;
        pb->val = ref_bin;
        pb->flags = 0;

        ASSERT((byte*)iov_entry->iov_base >= (byte*)ref_bin->orig_bytes);
        ASSERT(iov_entry->iov_len <= ref_bin->orig_size);

        pb->bytes = (byte*)iov_entry->iov_base;
        pb->size = iov_entry->iov_len;

        MSO(env->proc).first = (struct erl_off_heap_header*) pb;
        OH_OVERHEAD(&(MSO(env->proc)), pb->size / sizeof(Eterm));

        erts_refc_inc(&ref_bin->intern.refc, 2);
        *bin_term = make_binary(pb);
    } else {
        ErlHeapBin* hb = (ErlHeapBin*)alloc_heap(env, heap_bin_size(iov_entry->iov_len));

        hb->thing_word = header_heap_bin(iov_entry->iov_len);
        hb->size = iov_entry->iov_len;

        sys_memcpy(hb->data, iov_entry->iov_base, iov_entry->iov_len);
        *bin_term = make_binary(hb);
    }

    return 1;
}

SysIOVec *enif_ioq_peek(ErlNifIOQueue *q, int *iovlen)
{
    return erts_ioq_peekq(q, iovlen);
}

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


static ErtsCodeInfo** 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) {
	ErtsCodeInfo* ci = mod_code->functions[j];
	ASSERT(BeamIsOpCode(ci->op, op_i_func_info_IaaI));
	if (f_atom == ci->mfa.function
	    && arity == ci->mfa.arity) {
	    return 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(fmtfn_t 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_cbprintf(to,to_arg,"%s%.*s", delim, atom->len, atom->name);
	delim = ",";
    }
    erts_cbprintf(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;
}

#define AT_LEAST_VERSION(E,MAJ,MIN) \
    (((E)->major * 0x100 + (E)->minor) >= ((MAJ) * 0x100 + (MIN)))

/*
 * Allocate erl_module_nif and make a _modern_ copy of the lib entry.
 */
static struct erl_module_nif* create_lib(const ErlNifEntry* src)
{
    struct erl_module_nif* lib;
    ErlNifEntry* dst;
    Uint bytes = offsetof(struct erl_module_nif, _funcs_copy_);

    if (!AT_LEAST_VERSION(src, 2, 7))
        bytes += src->num_of_funcs * sizeof(ErlNifFunc);

    lib = erts_alloc(ERTS_ALC_T_NIF, bytes);
    dst = &lib->entry;

    sys_memcpy(dst, src, offsetof(ErlNifEntry, vm_variant));

    if (AT_LEAST_VERSION(src, 2, 1)) {
        dst->vm_variant = src->vm_variant;
    } else {
        dst->vm_variant = "beam.vanilla";
    }
    if (AT_LEAST_VERSION(src, 2, 7)) {
        dst->options = src->options;
    } else {
        /*
         * Make a modern copy of the ErlNifFunc array
         */
        struct ErlNifFunc_V1 {
            const char* name;
            unsigned arity;
            ERL_NIF_TERM (*fptr)(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]);
        }*src_funcs = (struct ErlNifFunc_V1*) src->funcs;
        int i;
        for (i = 0; i < src->num_of_funcs; ++i) {
            sys_memcpy(&lib->_funcs_copy_[i], &src_funcs[i], sizeof(*src_funcs));
            lib->_funcs_copy_[i].flags = 0;
        }
        dst->funcs = lib->_funcs_copy_;
        dst->options = 0;
    }
    if (AT_LEAST_VERSION(src, 2, 12)) {
        dst->sizeof_ErlNifResourceTypeInit = src->sizeof_ErlNifResourceTypeInit;
    } else {
        dst->sizeof_ErlNifResourceTypeInit = 0;
    }
    return lib;
};


BIF_RETTYPE load_nif_2(BIF_ALIST_2)
{
    static const char bad_lib[] = "bad_lib";
    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* module_p;
    Eterm mod_atom;
    const Atom* mod_atomp;
    Eterm f_atom;
    ErtsCodeMFA* caller;
    ErtsSysDdllError errdesc = ERTS_SYS_DDLL_ERROR_INIT;
    Eterm ret = am_ok;
    int veto;
    struct erl_module_nif* lib = NULL;
    struct erl_module_instance* this_mi;
    struct erl_module_instance* prev_mi;

    if (BIF_P->flags & F_HIPE_MODE) {
	ret = load_nif_error(BIF_P, "notsup", "Calling load_nif from HiPE compiled "
			     "modules not supported");
	BIF_RET(ret);
    }

    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_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
    erts_thr_progress_block();

    /* Find calling module */
    ASSERT(BIF_P->current != NULL);
    ASSERT(BIF_P->current->module == am_erlang
	   && BIF_P->current->function == am_load_nif 
	   && BIF_P->current->arity == 2);
    caller = find_function_from_pc(BIF_P->cp);
    ASSERT(caller != NULL);
    mod_atom = caller->module;
    ASSERT(is_atom(mod_atom));
    module_p = erts_get_module(mod_atom, erts_active_code_ix());
    ASSERT(module_p != 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;

    this_mi = &module_p->curr;
    prev_mi = &module_p->old;
    if (in_area(caller, module_p->old.code_hdr, module_p->old.code_length)) {
	ret = load_nif_error(BIF_P, "old_code", "Calling load_nif from old "
			     "module '%T' not allowed", mod_atom);
	goto error;
    } else if (module_p->on_load) {
	ASSERT(module_p->on_load->code_hdr->on_load_function_ptr);
	if (module_p->curr.code_hdr) {
	    prev_mi = &module_p->curr;
	} else {
	    prev_mi = &module_p->old;
	}
	this_mi = module_p->on_load;
    }

    if (this_mi->nif != NULL) {
        ret = load_nif_error(BIF_P,"reload","NIF library already loaded"
                             " (reload disallowed since OTP 20).");
    }
    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 (AT_LEAST_VERSION(entry, 2, 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 {
        lib = create_lib(entry);
        entry = &lib->entry; /* Use a guaranteed modern lib entry from now on */

        lib->handle = handle;
        erts_refc_init(&lib->rt_cnt, 0);
        erts_refc_init(&lib->rt_dtor_cnt, 0);
        ASSERT(opened_rt_list == NULL);
        lib->mod = module_p;

        for (i=0; i < entry->num_of_funcs && ret==am_ok; i++) {
	    ErtsCodeInfo** ci_pp;
            ErlNifFunc* f = &entry->funcs[i];

	    if (!erts_atom_get(f->name, sys_strlen(f->name), &f_atom, ERTS_ATOM_ENC_LATIN1)
		|| (ci_pp = get_func_pp(this_mi->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 (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.
		 */
		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 if (erts_codeinfo_to_code(ci_pp[1]) - erts_codeinfo_to_code(ci_pp[0])
                     < BEAM_NIF_MIN_FUNC_SZ)
	    {
		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);*/
	}
    }

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

    /* Call load or upgrade:
     */

    env.mod_nif = lib;

    lib->priv_data = NULL;
    if (prev_mi->nif != NULL) { /**************** Upgrade ***************/
        void* prev_old_data = prev_mi->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, NULL);
        veto = entry->upgrade(&env, &lib->priv_data, &prev_mi->nif->priv_data, BIF_ARG_2);
        erts_post_nif(&env);
        if (veto) {
            prev_mi->nif->priv_data = prev_old_data;
            ret = load_nif_error(BIF_P, upgrade, "Library upgrade-call unsuccessful (%d).", veto);
        }
    }
    else if (entry->load != NULL) { /********* Initial load ***********/
        erts_pre_nif(&env, BIF_P, lib, NULL);
        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 (%d).", veto);
        }
    }
    if (ret == am_ok) {
        commit_opened_resource_types(lib);

	/*
	** Everything ok, patch the beam code with op_call_nif
	*/

	this_mi->nif = lib;
	for (i=0; i < entry->num_of_funcs; i++)
	{
            ErlNifFunc* f = &entry->funcs[i];
	    ErtsCodeInfo* ci;
            BeamInstr *code_ptr;

	    erts_atom_get(f->name, sys_strlen(f->name), &f_atom, ERTS_ATOM_ENC_LATIN1);
	    ci = *get_func_pp(this_mi->code_hdr, f_atom, f->arity);
            code_ptr = erts_codeinfo_to_code(ci);

	    if (ci->u.gen_bp == NULL) {
		code_ptr[0] = BeamOpCodeAddr(op_call_nif);
	    }
	    else { /* Function traced, patch the original instruction word */
		GenericBp* g = ci->u.gen_bp;
		ASSERT(BeamIsOpCode(code_ptr[0], op_i_generic_breakpoint));
		g->orig_instr = BeamOpCodeAddr(op_call_nif);
	    }
	    if (f->flags) {
		code_ptr[3] = (BeamInstr) f->fptr;
		code_ptr[1] = (f->flags == ERL_NIF_DIRTY_JOB_IO_BOUND) ?
		    (BeamInstr) static_schedule_dirty_io_nif :
		    (BeamInstr) static_schedule_dirty_cpu_nif;
	    }
	    else
		code_ptr[1] = (BeamInstr) f->fptr;
	    code_ptr[2] = (BeamInstr) lib;
	}
    }
    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_thr_progress_unblock();
    erts_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
    erts_release_code_write_permission();
    erts_free(ERTS_ALC_T_TMP, lib_name);

    BIF_RET(ret);
}


void
erts_unload_nif(struct erl_module_nif* lib)
{
    ErlNifResourceType* rt;
    ErlNifResourceType* next;
    ASSERT(erts_thr_progress_is_blocking());
    ASSERT(lib != NULL);
    ASSERT(lib->mod != NULL);

    erts_tracer_nif_clear();

    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(ErtsResource,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, Process *tracee,
                             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_LC_ASSERT(erts_proc_lc_my_proc_locks(p) & ERTS_PROC_LOCK_MAIN
                           || erts_thr_progress_is_blocking());
#endif
    if (p) {
        /* This is almost a normal nif call like in beam_emu,
           except that any heap consumed by the nif will be
           released without checking if anything in it is live.
           This is because we cannot do a GC here as we don't know
           the number of live registers that have to be preserved.
           This means that any heap part of the returned term may
           not be used outside this function. */
        struct enif_environment_t env;
        ErlHeapFragment *orig_hf = MBUF(p);
        ErlOffHeap orig_oh = MSO(p);
        Eterm *orig_htop = HEAP_TOP(p);
        ASSERT(is_internal_pid(p->common.id));
        MBUF(p) = NULL;
        clear_offheap(&MSO(p));

        erts_pre_nif(&env, p, mod, tracee);
#ifdef ERTS_NIF_ASSERT_IN_ENV
        env.dbg_disable_assert_in_env = 1;
#endif
        nif_result = (*fun->fptr)(&env, argc, argv);
        if (env.exception_thrown)
            nif_result = THE_NON_VALUE;
        erts_post_nif(&env);

        /* Free any offheap and heap fragments created in nif */
        if (MSO(p).first) {
            erts_cleanup_offheap(&MSO(p));
            clear_offheap(&MSO(p));
        }
        if (MBUF(p))
            free_message_buffer(MBUF(p));

        /* restore original heap fragment list */
        MBUF(p) = orig_hf;
        MSO(p) = orig_oh;
        HEAP_TOP(p) = orig_htop;
    } else {
        /* Nif call was done without a process context,
           so we create a phony one. */
        struct enif_msg_environment_t msg_env;
        pre_nif_noproc(&msg_env, mod, tracee);
#ifdef ERTS_NIF_ASSERT_IN_ENV
        msg_env.env.dbg_disable_assert_in_env = 1;
#endif
        nif_result = (*fun->fptr)(&msg_env.env, argc, argv);
        if (msg_env.env.exception_thrown)
            nif_result = THE_NON_VALUE;
        post_nif_noproc(&msg_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 ERTS_NIF_ASSERT_IN_ENV
static void dbg_assert_in_env(ErlNifEnv* env, Eterm term,
                              int nr, const char* type, const char* func)
{
    Uint saved_used_size;
    Eterm* real_htop;

    if (is_immed(term)
        || (is_non_value(term) && env->exception_thrown)
        || erts_is_literal(term, ptr_val(term)))
        return;

    if (env->dbg_disable_assert_in_env) {
        /*
         * Trace nifs may cheat as built terms are discarded after return.
         * ToDo: Check if 'term' is part of argv[].
         */
        return;
    }

    if (env->heap_frag) {
        ASSERT(env->heap_frag == MBUF(env->proc));
        ASSERT(env->hp >= env->heap_frag->mem);
        ASSERT(env->hp <= env->heap_frag->mem + env->heap_frag->alloc_size);
        saved_used_size = env->heap_frag->used_size;
        env->heap_frag->used_size = env->hp - env->heap_frag->mem;
        real_htop = NULL;
    }
    else {
        real_htop = env->hp;
    }
    if (!erts_dbg_within_proc(ptr_val(term), env->proc, real_htop)) {
        fprintf(stderr, "\r\nFAILED ASSERTION in %s:\r\n", func);
        if (nr) {
            fprintf(stderr, "Term #%d of the %s is not from same ErlNifEnv.",
                    nr, type);
        }
        else {
            fprintf(stderr, "The %s is not from the same ErlNifEnv.", type);
        }
        fprintf(stderr, "\r\nABORTING\r\n");
        abort();
    }
    if (env->heap_frag) {
        env->heap_frag->used_size = saved_used_size;
    }
}
#endif

#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 */