about summary refs log blame commit diff stats
path: root/072slice.subx
blob: 1d0fe855beef179144fe3272624e8d586214e786 (plain) (tree)
1
2
3
4
5
6
7
8
9







                                                                                                                                                 
                                                     
                

                                                                                                                                                                       
                      


                                                                                                                                                                            
                                         




                                                                                                                                                                                
                                             
                                 

                         
                 
                

                                                                                                                                                                       


                      
                


                                                                                                                                                                       

                           
                                                                                                                                                                       

                         
               


                                

                                                                                                                                                                  


                                              
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       


                       
                


                                                                                                                                                                       

                           
                                                                                                                                                                       

                         
               


                                

                                                                                                                                                                  


                                               
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       

             
                                                                           
                 
                                   



                                                   
                          





                                            




                   
     
                

                                                                                                                                                                       
                      














                                                                                                                                                                             
                                 
                                                                                                                                                                   


                                                            
                               


                                              

                                                                                                                                                                            
                                                   




                                                                                                                                                                  
                   
                                    
                                                                                                                                                                            
                                                                  
                 
                                                                                                                                                                               
                 


                                                                                                                                                                               
                                                   
             
                    
             
                    

                                    
                           

                                    
                           

                         



                 
                

                                                                                                                                                                       



                                              
                











                                                                                                                                                                             
                   
                        
               


                                

                                                                                                                                                                  


                                         
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                              
                











                                                                                                                                                                             
                   
                        
               


                                

                                                                                                                                                                  


                                               
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                               
                











                                                                                                                                                                             
                   
                        
               


                                

                                                                                                                                                                  


                                                  
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                            
                











                                                                                                                                                                             
                   
                        
               


                                

                                                                                                                                                                  


                                                   
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                           
                


                                                                                                                                                                       

                          

                                                                                                                                                                       
                   
                        
               


                                

                                                                                                                                                                  


                                               
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                          
                











                                                                                                                                                                             
                   
                     
               


                                

                                                                                                                                                                  


                                                    
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                        
                


                                                                                                                                                                       

                          

                                                                                                                                                                       
                   
                     
               


                                

                                                                                                                                                                  


                                                          
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       

             

                                            
                











                                                                                                                                                                             

                    
               


                                

                                                                                                                                                                  


                                                   
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       

             
                                                                                    













                                                  





                   
     
                

                                                                                                                                                                       
                      













                                                                                                                                                                              
                                                
                                                                                                                                                                            
                                                       








                                                                                                                                                                        

                                
                                                                                                                                                                            

                                                               
                                                                                                                                                                               
                 
                                                                                                                                                                               
                                        
                                                                                                                                                                           

                                                         
                    
             
                    
             
                    

                                          
                           

                                          
                           

                         




                 
                

                                                                                                                                                                       



                                                  
                











                                                                                                                                                                             

                      
               


                                      

                                                                                                                                                                  


                                                                
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                                 
                











                                                                                                                                                                             

                     
               


                                      

                                                                                                                                                                  


                                                            
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                                   
                











                                                                                                                                                                             

                       
               


                                      

                                                                                                                                                                  


                                                                   
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                                    
                











                                                                                                                                                                             

                        
               


                                      

                                                                                                                                                                  


                                                             
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                                    
                











                                                                                                                                                                             

                        
               


                                      

                                                                                                                                                                  


                                                     
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       



                                                   
                











                                                                                                                                                                             

                       
               


                                      

                                                                                                                                                                  


                                                       
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       

             


                                                           
                

                                                                                                                                                                       
                      

















                                                                                                                                                                             

                            
                                                                                                                                                                            

                                                                     
                                                                                                                                                                            


                                                         

                                                                                                                                                                               
                                  
                                                                                                                                                                                
                  
                    
          
                    


                                    
                                                                                                                                                                        

                         





                 
                

                                                                                                                                                                       









                                              
                                                                                                                                                                  
                        

                                



                         
                

                                                                                                                                                                       






                                  









                                                                                                                                                                             

                                      
               



                               
                                                                                                                                                                  







                                                  
                                                                                                                                                                  
                

                                                                                                                                                                       


                                  
                                                                           
                

                                                                                                                                                                       
                      

















                                                                                                                                                                             
                           
                            
                                                                                                                                                                            
                                                                              
                                                                 
                                                                                                                                                                            
                                                            
                          
                                                                                                                                                                            
                  
                   
               


                         
                                                                                                                                                                  
                                    
                   

                                                                                                                                                                         


                                


                                                                                                                                                                  
                                
                                 
                

                                                                                                                                                                               
                                  
                                                                                                                                                                                
                  
                    
          
                    

                                             
                                                
                                                                                                                                                                            
                          
                         





                 
                

                                                                                                                                                                       

             
                          
                

                                                                                                                                                                       






                                  
                                                                                                                                                                  
                                                 
                   
                                              


                                









                                                                                                                                                                             
                                                      
                   
               

                                      
                                        
                      
                                                                                                                                                                  





                                      
                                                                                                                                                                  
                                                  
                   
                                                  

                               
              
                                      
                      
                                                                                                                                                                  
                

                                                                                                                                                                       

             
                                                        
                                                                                                           
                

                                                                                                                                                                       
                      














                                                                                                                                                                             
                   

                                                                                                                                                                     


                            


                                                                                                                                                                  

                                                  

                                                                                                                                                                            
              

                                                                   
                   







                                                                                                                                                                      


                             
                                                                                                                                                                  
                                                 
                 
                     
                         



                 
                

                                                                                                                                                                       




                               
                                                    



                           
                                                                                                                                                                  
                        

                                



                         
                


                                                                                                                                                                       

                          
                                                                                                                                                                       

                             
               



                               










                                                                                                                                                                             
                   

               


                                   
                                                                                                                                                                  







                                  

                                                                                                                                                                     
                      
                  



                              
                                                                                                                                                                     
                                 
                      
                           



                              
                                                                                                                                                                     
            
                                     

                        
               


                                 

                                                                                                                                                                  


                                             
               


                                    
                                                                                                                                                                  
                

                                                                                                                                                                       

             
                            
# new data structure: a slice is an open interval of addresses [start, end)
# that includes 'start' but not 'end'

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

slice-empty?:  # s : (address slice) -> eax : boolean
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    # ecx = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   8/disp8         .                 # copy *(ebp+8) to ecx
    # if (s->start == s->end) return true
    # . eax = s->start
    8b/copy                         0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/eax   .               .                 # copy *ecx to eax
    # . compare eax and s->end
    39/compare                      1/mod/*+disp8   1/rm32/ecx    .           .             .           0/r32/eax   4/disp8         .                 # compare eax and *(ecx+4)
    b8/copy-to-eax  1/imm32/true
    74/jump-if-equal  $slice-empty?:end/disp8
    b8/copy-to-eax  0/imm32/false
$slice-empty?:end:
    # . restore registers
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-empty-true:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # var slice/ecx = {34, 34}
    68/push  34/imm32/end
    68/push  34/imm32/start
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # slice-empty?(slice)
    # . . push args
    51/push-ecx
    # . . call
    e8/call  slice-empty?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-empty-true"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-empty-false:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # var slice/ecx = {34, 23}
    68/push  23/imm32/end
    68/push  34/imm32/start
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # slice-empty?(slice)
    # . . push args
    51/push-ecx
    # . . call
    e8/call  slice-empty?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-empty-false"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

slice-equal?:  # s : (address slice), p : (address string) -> eax : boolean
    # pseudocode:
    #   if (p == 0) return (s == 0)
    #   currs = s->start
    #   maxs = s->end
    #   if (maxs - currs != p->length) return false
    #   currp = p->data
    #   while currs < maxs
    #     if (*currs != *currp) return false
    #     ++currs
    #     ++currp
    #   return true
    #
    # registers:
    #   currs: edx
    #   maxs: esi
    #   currp: ebx
    #   *currs: eax
    #   *currp: ecx
    #
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
    # currs/edx = s->start
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           2/r32/edx   .               .                 # copy *esi to edx
    # maxs/esi = s->end
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           6/r32/esi   4/disp8         .                 # copy *(esi+4) to esi
    # eax = maxs - currs
    89/copy                         3/mod/direct    0/rm32/eax    .           .             .           6/r32/esi   .               .                 # copy esi to eax
    29/subtract                     3/mod/direct    0/rm32/eax    .           .             .           2/r32/edx   .               .                 # subtract edx from eax
    # ebx = p
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           3/r32/ebx   0xc/disp8       .                 # copy *(ebp+12) to ebx
    # if (p != 0) goto next check
    81          7/subop/compare     3/mod/direct    3/rm32/ebx    .           .             .           .           .               0/imm32           # compare ebx
    75/jump-if-not-equal  $slice-equal?:nonnull-string/disp8
$slice-equal?:null-string:
    # return s->start == s->end
    3d/compare-eax-and  0/imm32
    74/jump-if-equal  $slice-equal?:true/disp8
    eb/jump  $slice-equal?:false/disp8
$slice-equal?:nonnull-string:
    # if (eax != p->length) return false
    39/compare                      0/mod/indirect  3/rm32/ebx    .           .             .           0/r32/eax   .               .                 # compare *ebx and eax
    75/jump-if-not-equal  $slice-equal?:false/disp8
    # currp/ebx = p->data
    81          0/subop/add         3/mod/direct    3/rm32/ebx    .           .             .           .           .               4/imm32           # add to ebx
    # eax = ecx = 0
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    31/xor                          3/mod/direct    1/rm32/ecx    .           .             .           1/r32/ecx   .               .                 # clear ecx
$slice-equal?:loop:
    # if (currs >= maxs) return true
    39/compare                      3/mod/direct    2/rm32/edx    .           .             .           6/r32/esi   .               .                 # compare edx with esi
    73/jump-if-greater-or-equal-unsigned  $slice-equal?:true/disp8
    # AL = *currp
    8a/copy-byte                    0/mod/indirect  3/rm32/ebx    .           .             .           0/r32/AL    .               .                 # copy byte at *ebx to AL
    # CL = *currs
    8a/copy-byte                    0/mod/indirect  2/rm32/edx    .           .             .           1/r32/CL    .               .                 # copy byte at *edx to CL
    # if (eax != ecx) return false
    39/compare                      3/mod/direct    0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # compare eax and ecx
    75/jump-if-not-equal  $slice-equal?:false/disp8
    # ++currp
    43/increment-ebx
    # ++currs
    42/increment-edx
    eb/jump $slice-equal?:loop/disp8
$slice-equal?:false:
    b8/copy-to-eax  0/imm32
    eb/jump  $slice-equal?:end/disp8
$slice-equal?:true:
    b8/copy-to-eax  1/imm32
$slice-equal?:end:
    # . restore registers
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal:
    # - slice-equal?(slice("Abc"), "Abc") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-equal"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-false:
    # - slice-equal?(slice("bcd"), "Abc") == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "bcd"
    b8/copy-to-eax  "bcd"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-false"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-too-long:
    # - slice-equal?(slice("Abcd"), "Abc") == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abcd"
    b8/copy-to-eax  "Abcd"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-too-long"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-too-short:
    # - slice-equal?(slice("A"), "Abc") == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "A"
    b8/copy-to-eax  "A"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-too-short"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-empty:
    # - slice-equal?(slice(""), "Abc") == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # var slice/ecx
    68/push  0/imm32/end
    68/push  0/imm32/start
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-empty"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-with-empty:
    # - slice-equal?(slice("Ab"), "") == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Ab"
    b8/copy-to-eax  "Ab"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "")
    # . . push args
    68/push  ""/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-with-empty"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-empty-with-empty:
    # - slice-equal?(slice(""), "") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # var slice/ecx
    68/push  0/imm32/end
    68/push  0/imm32/start
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, "")
    # . . push args
    68/push  ""/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-equal-empty-with-empty"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-equal-with-null:
    # - slice-equal?(slice("Ab"), null) == 0
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Ab"
    b8/copy-to-eax  "Ab"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-equal?(ecx, 0)
    # . . push args
    68/push  0/imm32
    51/push-ecx
    # . . call
    e8/call  slice-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-equal-with-null"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

slice-starts-with?:  # s : (address slice), head : (address string) -> eax : boolean
    # pseudocode
    #   lenh = head->length
    #   if (lenh > s->end - s->start) return false
    #   i = 0
    #   currs = s->start
    #   currp = head->data
    #   while i < lenh
    #     if (*currs != *currh) return false
    #     ++i
    #     ++currs
    #     ++currh
    #   return true
    #
    # registers:
    #   currs: esi
    #   currh: edi
    #   *currs: eax
    #   *currh: ebx
    #   i: ecx
    #   lenh: edx
    #
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   8/disp8         .                 # copy *(ebp+8) to esi
    # ecx = s->end - s->start
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           1/r32/ecx   4/disp8         .                 # copy *(esi+4) to ecx
    2b/subtract                     0/mod/indirect  6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # subtract *esi from ecx
    # edi = head
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           7/r32/edi   0xc/disp8       .                 # copy *(ebp+12) to edi
    # lenh/edx = head->length
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           2/r32/edx   .               .                 # copy *edi to edx
    # if (lenh > s->end - s->start) return false
    39/compare                      3/mod/direct    2/rm32/edx    .           .             .           1/r32/ecx   .               .                 # compare edx with ecx
    7f/jump-if-greater  $slice-starts-with?:false/disp8
    # currs/esi = s->start
    8b/subtract                     0/mod/indirect  6/rm32/esi    .           .             .           6/r32/esi   .               .                 # copy *esi to esi
    # currh/edi = head->data
    81          0/subop/add         3/mod/direct    7/rm32/edi    .           .             .           .           .               4/imm32           # add to edi
    # i/ecx = 0
    31/xor                          3/mod/direct    1/rm32/ecx    .           .             .           1/r32/ecx   .               .                 # clear ecx
    # eax = ebx = 0
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    31/xor                          3/mod/direct    3/rm32/ebx    .           .             .           3/r32/ebx   .               .                 # clear ebx
$slice-starts-with?:loop:
    # if (i >= lenh) return true
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           2/r32/edx   .               .                 # compare ecx with edx
    7d/jump-if-greater-or-equal  $slice-starts-with?:true/disp8
    # AL = *currs
    8a/copy-byte                    0/mod/indirect  6/rm32/esi    .           .             .           0/r32/AL    .               .                 # copy byte at *esi to AL
    # BL = *currh
    8a/copy-byte                    0/mod/indirect  7/rm32/edi    .           .             .           3/r32/BL    .               .                 # copy byte at *edi to BL
    # if (*currs != *currh) return false
    39/compare                      3/mod/direct    0/rm32/eax    .           .             .           3/r32/ebx   .               .                 # compare eax and ebx
    75/jump-if-not-equal  $slice-starts-with?:false/disp8
    # ++i
    41/increment-ecx
    # ++currs
    46/increment-esi
    # ++currh
    47/increment-edi
    eb/jump $slice-starts-with?:loop/disp8
$slice-starts-with?:true:
    b8/copy-to-eax  1/imm32
    eb/jump  $slice-starts-with?:end/disp8
$slice-starts-with?:false:
    b8/copy-to-eax  0/imm32
$slice-starts-with?:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-single-character:
    # - slice-starts-with?(slice("Abc"), "A") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "A")
    # . . push args
    68/push  "A"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-single-character"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-empty-string:
    # - slice-starts-with?(slice("Abc"), "") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "")
    # . . push args
    68/push  ""/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-empty-string"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-multiple-characters:
    # - slice-starts-with?(slice("Abc"), "Ab") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "Ab")
    # . . push args
    68/push  "Ab"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-multiple-characters"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-entire-string:
    # - slice-starts-with?(slice("Abc"), "Abc") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-entire-string"/imm32
    68/push  1/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-fails:
    # - slice-starts-with?(slice("Abc"), "Abd") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "Abd")
    # . . push args
    68/push  "Abd"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-fails"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-slice-starts-with-fails-2:
    # - slice-starts-with?(slice("Abc"), "Ac") == 1
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-starts-with?(ecx, "Ac")
    # . . push args
    68/push  "Ac"/imm32
    51/push-ecx
    # . . call
    e8/call  slice-starts-with?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 0, msg)
    # . . push args
    68/push  "F - test-slice-starts-with-fails-2"/imm32
    68/push  0/imm32
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# write a slice to a stream
# abort if the stream doesn't have enough space
write-slice:  # out : (address stream), s : (address slice)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # curr/ecx = s->start
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # copy *esi to ecx
    # max/esi = s->end
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           6/r32/esi   4/disp8         .                 # copy *(esi+4) to esi
    # edi = out
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # edx = out->length
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           2/r32/edx   8/disp8         .                 # copy *(edi+8) to edx
    # ebx = out->write
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           3/r32/ebx   .               .                 # copy *edi to ebx
$write-slice:loop:
    # if (curr >= max) break
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           6/r32/esi   .               .                 # compare ecx with esi
    73/jump-if-greater-or-equal-unsigned  $write-slice:loop-end/disp8
    # if (out->write >= out->length) abort
    39/compare                      3/mod/direct    3/rm32/ebx    .           .             .           2/r32/edx   .               .                 # compare ebx with edx
    7d/jump-if-greater-or-equal  $write-slice:abort/disp8
    # out->data[out->write] = *in
    # . AL = *in
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    8a/copy-byte                    0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/AL    .               .                 # copy byte at *ecx to AL
    # . out->data[out->write] = AL
    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/edi  3/index/ebx   .           0/r32/AL    0xc/disp8       .                 # copy AL to *(edi+ebx+12)
    # ++out->write
    43/increment-ebx
    # ++in
    41/increment-ecx
    eb/jump  $write-slice:loop/disp8
$write-slice:loop-end:
    # persist out->write
    89/copy                         0/mod/indirect  7/rm32/edi    .           .             .           3/r32/ebx   .               .                 # copy ebx to *edi
$write-slice:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

$write-slice:abort:
    # . _write(2/stderr, error)
    # . . push args
    68/push  "write-slice: out of space"/imm32
    68/push  2/imm32/stderr
    # . . call
    e8/call  _write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . syscall(exit, 1)
    bb/copy-to-ebx  1/imm32
    b8/copy-to-eax  1/imm32/exit
    cd/syscall  0x80/imm8
    # never gets here

test-write-slice:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # write-slice(_test-stream, slice)
    # . . push args
    51/push-ecx
    68/push  _test-stream/imm32
    # . . call
    e8/call  write-slice/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-stream-equal(_test-stream, "Abc", msg)
    # . . push args
    68/push  "F - test-write-slice"/imm32
    68/push  "Abc"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# write a slice to a buffered-file
write-slice-buffered:  # out : (address buffered-file), s : (address slice)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    57/push-edi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # curr/ecx = s->start
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           1/r32/ecx   .               .                 # copy *esi to ecx
    # max/esi = s->end
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           6/r32/esi   4/disp8         .                 # copy *(esi+4) to esi
    # edi = out
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # edx = out->length
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(edi+12) to edx
    # ebx = out->write
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           3/r32/ebx   4/disp8         .                 # copy *(edi+4) to ebx
$write-slice-buffered:loop:
    # if (curr >= max) break
    39/compare                      3/mod/direct    1/rm32/ecx    .           .             .           6/r32/esi   .               .                 # compare ecx with esi
    73/jump-if-greater-or-equal-unsigned  $write-slice-buffered:loop-end/disp8
    # if (out->write >= out->length) flush and clear out's stream
    39/compare                      3/mod/direct    3/rm32/ebx    .           .             .           2/r32/edx   .               .                 # compare ebx with edx
    7c/jump-if-lesser  $write-slice-buffered:to-stream/disp8
    # . persist out->write
    89/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           3/r32/ebx   4/disp8         .                 # copy ebx to *(edi+4)
    # . flush(out)
    # . . push args
    57/push-edi
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(stream = out+4)
    # . . push args
    8d/copy-address                 1/mod/*+disp8   7/rm32/edi    .           .             .           0/r32/eax   4/disp8         .                 # copy edi+4 to eax
    50/push-eax
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . out->write must now be 0; update its cache at ebx
    31/xor                          3/mod/direct    3/rm32/ebx    .           .             .           3/r32/ebx   .               .                 # clear ebx
$write-slice-buffered:to-stream:
    # out->data[out->write] = *in
    # . AL = *in
    31/xor                          3/mod/direct    0/rm32/eax    .           .             .           0/r32/eax   .               .                 # clear eax
    8a/copy-byte                    0/mod/indirect  1/rm32/ecx    .           .             .           0/r32/AL    .               .                 # copy byte at *ecx to AL
    # . out->data[out->write] = AL
    88/copy-byte                    1/mod/*+disp8   4/rm32/sib    7/base/edi  3/index/ebx   .           0/r32/AL    0x10/disp8      .                 # copy AL to *(edi+ebx+16)
    # ++out->write
    43/increment-ebx
    # ++in
    41/increment-ecx
    eb/jump  $write-slice-buffered:loop/disp8
$write-slice-buffered:loop-end:
    # persist necessary variables from registers
    89/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           3/r32/ebx   4/disp8         .                 # copy ebx to *(edi+4)
$write-slice-buffered:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-write-slice-buffered:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-buffered-file->buffer)
    # . . push args
    68/push  _test-buffered-file->buffer/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # write-slice-buffered(_test-buffered-file, slice)
    # . . push args
    51/push-ecx
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  write-slice-buffered/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # flush(_test-buffered-file)
    # . . push args
    68/push  _test-buffered-file/imm32
    # . . call
    e8/call  flush/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # check-stream-equal(_test-stream, "Abc", msg)
    # . . push args
    68/push  "F - test-write-slice-buffered"/imm32
    68/push  "Abc"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# copy a slice into a new (dynamically allocated) string
slice-to-string:  # ad : (address allocation-descriptor), in : (address slice) -> out/eax : (address array)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    51/push-ecx
    52/push-edx
    53/push-ebx
    56/push-esi
    # esi = in
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # curr/edx = in->start
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           2/r32/edx   .               .                 # copy *esi to edx
    # max/ebx = in->end
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           3/r32/ebx   4/disp8         .                 # copy *(esi+4) to ebx
    # size/ecx = max - curr + 4  # total size of output string (including the initial length)
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           3/r32/ebx   .               .                 # copy ebx to ecx
    29/subtract                     3/mod/direct    1/rm32/ecx    .           .             .           2/r32/edx   .               .                 # subtract edx from ecx
    81          0/subop/add         3/mod/direct    1/rm32/ecx    .           .             .           .           .               4/imm32           # add to ecx
    # out/eax = allocate(ad, size)
    # . . push args
    51/push-ecx
    ff          6/subop/push        1/mod/*+disp8   5/rm32/ebp    .           .             .           .           8/disp8         .                 # push *(ebp+8)
    # . . call
    e8/call  allocate/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # if (eax == 0) abort
    3d/compare-eax-and  0/imm32
    74/jump-if-equal  $slice-to-string:abort/disp8
    # *out = size-4
    89/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy ecx to *eax
    81          5/subop/subtract    0/mod/indirect  0/rm32/eax    .           .             .           .           .               4/imm32           # subtract 4 from *eax
    # save out
    50/push-eax
    # eax = _append-4(eax+4, eax+size, curr, max)  # clobbering ecx
    # . . push args
    53/push-ebx
    52/push-edx
    # . . push eax+size (clobbering ecx)
    01/add                          3/mod/direct    1/rm32/ecx    .           .             .           0/r32/eax   .               .                 # add eax to ecx
    51/push-ecx
    # . . push eax+4 (clobbering eax)
    81          0/subop/add         3/mod/direct    0/rm32/eax    .           .             .           .           .               4/imm32           # add to eax
    50/push-eax
    # . . call
    e8/call  _append-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
    # restore out (assumes _append-4 can't error)
    58/pop-to-eax
$slice-to-string:end:
    # . restore registers
    5e/pop-to-esi
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

$slice-to-string:abort:
    # . _write(2/stderr, error)
    # . . push args
    68/push  "slice-to-string: out of space\n"/imm32
    68/push  2/imm32/stderr
    # . . call
    e8/call  _write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . syscall(exit, 1)
    bb/copy-to-ebx  1/imm32
    b8/copy-to-eax  1/imm32/exit
    cd/syscall  0x80/imm8
    # never gets here

test-slice-to-string:
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # var heap/edx : (address allocation-descriptor) = {0, 0}
    68/push  0/imm32/limit
    68/push  0/imm32/curr
    89/copy                         3/mod/direct    2/rm32/edx    .           .             .           4/r32/esp   .               .                 # copy esp to edx
    # heap = new-segment(512)
    # . . push args
    52/push-edx
    68/push  0x200/imm32
    # . . call
    e8/call  new-segment/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # (eax..ecx) = "Abc"
    b8/copy-to-eax  "Abc"/imm32
    8b/copy                         0/mod/indirect  0/rm32/eax    .           .             .           1/r32/ecx   .               .                 # copy *eax to ecx
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    0/base/eax  1/index/ecx   .           1/r32/ecx   4/disp8         .                 # copy eax+ecx+4 to ecx
    05/add-to-eax  4/imm32
    # var slice/ecx = {eax, ecx}
    51/push-ecx
    50/push-eax
    89/copy                         3/mod/direct    1/rm32/ecx    .           .             .           4/r32/esp   .               .                 # copy esp to ecx
    # eax = slice-to-string(heap, slice)
    # . . push args
    51/push-ecx
    52/push-edx
    # . . call
    e8/call  slice-to-string/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
#?     # dump word-slice {{{
#?     # . write(2/stderr, "AA: ")
#?     # . . push args
#?     68/push  "AA: "/imm32
#?     68/push  2/imm32/stderr
#?     # . . call
#?     e8/call  write/disp32
#?     # . . discard args
#?     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
#?     # . write(2/stderr, eax)
#?     # . . push args
#?     50/push-eax
#?     68/push  2/imm32/stderr
#?     # . . call
#?     e8/call  write/disp32
#?     # . . discard args
#?     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
#?     # . write(2/stderr, "$\n")
#?     # . . push args
#?     68/push  "$\n"/imm32
#?     68/push  2/imm32/stderr
#?     # . . call
#?     e8/call  write/disp32
#?     # . . discard args
#?     81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
#?     # }}}
    # eax = string-equal?(eax, "Abc")
    # . . push args
    68/push  "Abc"/imm32
    50/push-eax
    # . . call
    e8/call  string-equal?/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-ints-equal(eax, 1, msg)
    # . . push args
    68/push  "F - test-slice-to-string"/imm32
    68/push  1/imm32/true
    50/push-eax
    # . . call
    e8/call  check-ints-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

# . . vim:nowrap:textwidth=0