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15.4.302  src/lib/compiler/back/low/main/nextcode/nextcode-ccalls-g.pkg

# nextcode-ccalls-g.pkg
#
# This module now contains all the code which handles C-Calls.
# I've moved Matthias' ccall code from translate_nextcode_to_treecode_g into here and added
# my own hacks for handling re-entrant C calls.
#
# On the implementation of reentrant C calls, or why it is a hack
# ---------------------------------------------------------------
#
# For reentrant C call, we need a way of flushing/restoring the Mythryl state 
# to/from the task_state data package and preserving all live values.
# Determining the set of live values is a bit tricky and I handle it
# by doing a liveness analysis.  Ideally, the nextcode phases should be able
# to do the liveness part for us, but after spending weeks 
# looking at the source and asking questions with no one answering,
# I've decided that I've had enough: I need this working NOW 
# so I going to do it the stupid way.  At least this way it is 
# completely self-contained and doesn't involve any nextcode hacking.
# If in the future someone gets the right info it should be redone in the
# right way.                                                                    XXX BUGGO FIXME

# The code for saving/restoring live values is quite similar to what
# the cleaning is doing, but I'm deathly afraid of merging it into the
# cleaning code, because the cleaning handling code had taken me a
# long time to  get right.  It is an angry slumbering power which will visit
# its  horrible wraths on all who dares to disturb it.
#
# On saving/restoring lib7 state
# ----------------------------
#
# The Mythryl state must be threaded into a reentrant C call because the C call
# may invoke Mythryl code internally before it returns.   Saving the state means
# two things:
#
#   1. Making sure all the live values are properly saved and restored 
#      (and properly tagged so that the gc can find them) 
#
#   2. Making sure global registers such as heap_allocation_pointer are properly
#      single threaded through the calls.
#
# The Mythryl state is defined in the runtime struct task.
# For our purposes, the relevant fields are these:
#                              
#  Val   *heap_allocation_pointer;                                      # We allot heap memory by advancing this pointer.
#  Val   *heap_allocation_limit;                                        # We call the heapcleaner when heap_allocation_pointer reaches this point.
#  Val    argument;
#  Val    fate;
#  Val    closure;
#  Val    link_register;
#  Val    program_counter;              
#  Val    exception_fate;
#  Val    thread;
#  Val    callee_saved_registers[ CALLEE_SAVED_REGISTERS_COUNT ];
#  Val    heap_changelog;    
#  Val    fault_exception;    
#  Vunt         faulting_program_counter;    
#  Val   *real_heap_allocation_limit;                                                   # Sometimes we zero the heap_allocation_limit to trigger the heapcleaner; this records the real limit.
#  Bool         software_generated_periodic_event_is_pending;     
#  Bool         in_software_generated_periodic_event_handler;    
#
# To make a ccall reentrant we flush the following registers back into
# the task record:
#
#     heap_allocation_pointer      --
#     heap_allocation_limit       --
#     heap_changelog   --
#     thread           --
#     exception_fate   --
#
# All all untagged values are packed into a single record
#     argument         --
#     fate             --

#
# --- Allen Leung

# Compiled by:
#     src/lib/compiler/core.sublib


###                 "On the subject of stars, all investigations
###                  which are not ultimately reducible to simple
###                  visual observations are necessarily denied to us.
###                  We shall never be able by any means to study
###                  their chemical composition."
###
###                                  -- August Compte, 1835


# We are invoked (only) by:
#
#     src/lib/compiler/back/low/main/main/translate-nextcode-to-treecode-g.pkg

                                                                # Machine_Properties                    is from   src/lib/compiler/back/low/main/main/machine-properties.api
stipulate
    package cty =  ctypes;                                      # ctypes                                is from   src/lib/compiler/back/low/ccalls/ctypes.pkg
    package ncf =  nextcode_form;                               # nextcode_form                         is from   src/lib/compiler/back/top/nextcode/nextcode-form.pkg
    package lem =  lowhalf_error_message;                       # lowhalf_error_message                 is from   src/lib/compiler/back/low/control/lowhalf-error-message.pkg
    package lms =  list_mergesort;                              # list_mergesort                        is from   src/lib/src/list-mergesort.pkg
    package rkj =  registerkinds_junk;                          # registerkinds_junk                    is from   src/lib/compiler/back/low/code/registerkinds-junk.pkg
    package set =  int_red_black_set;                           # int_red_black_set                     is from   src/lib/src/int-red-black-set.pkg
herein                                                          # (Typed set for liveness.)

    generic package   nextcode_c_calls_g   (
        #             ==================
        #
        package mp:  Machine_Properties;                        # Typically                                       src/lib/compiler/back/low/main/intel32/machine-properties-intel32.pkg

        package pri: Platform_Register_Info                     # Platform_Register_Info                is from   src/lib/compiler/back/low/main/nextcode/platform-register-info.api
                     where                                      # "tcf" == "treecode_form".
                         tcf::rgn == nextcode_ramregions;

        package rgk: Registerkinds;                             # Registerkinds                         is from   src/lib/compiler/back/low/code/registerkinds.api

        package t2m: Translate_Treecode_To_Machcode             # Translate_Treecode_To_Machcode        is from   src/lib/compiler/back/low/treecode/translate-treecode-to-machcode.api
                     where
                         tcs::tcf == pri::tcf;                  # "tcf" == "treecode_form".

        package cal: Ccalls                                     # Ccalls                                is from   src/lib/compiler/back/low/ccalls/ccalls.api
                     where
                         tcf == pri::tcf;                       # "tcf" == "treecode_form".
    )

    : (weak) api { 
              ccall:  
                  { treecode_to_machcode_stream:        t2m::Treecode_Codebuffer,                       # Treecode stream 
                    #
                    get_int_reg_for_ncfval:             ncf::Value -> pri::tcf::Int_Expression,         # Look up integer Variable 
                    get_float_reg_for_ncfvar:           ncf::Value -> pri::tcf::Float_Expression,       # Look up float   Variable 
                    #
                    get_ncftype_for_codetemp:           ncf::Codetemp -> ncf::Type,                     # Variable -> cty 
                    #
                    hap_offset:                         Int,                                            # Top-of-heap offset relative to current heap_allocation_pointer register.  ("hap_offset" == "heap_allocation_pointer offset".)
                    use_virtual_framepointer:           Bool                                            # Virtual frame pointer.
                  }
                  -> 
                  #  Arguments to RAW_C_CALL 
                  #
                  ( ncf::Rcc_Kind,                                                                      # Fast vs re-entrant.
                    #
                    String,                                                                             # library/function_name
                    cty::Cfun_Type,                                                                     # C function type -- redundant with other args.
                    #
                    List( ncf::Value ),                                                                 # Args.
                    List( (ncf::Codetemp, ncf::Type) ),                                                 # Where to stash results.
                    #
                    ncf::Instruction                                                                    # Next instruction to execute.
                  )
                  ->
                  # Return:
                  #      
                  { result:    List( pri::tcf::Expression ),                                            # Result(s).
                    hap_offset:  Int                                                                    # Updated top-of-heap offset relative to current heap_allocation_pointer register.
                  };
           }
    {

        stipulate
            package tcs =  t2m::tcs;                                                            # "tcs" == "treecode_stream".
            package tcf =  tcs::tcf;                                                            # "tcf" == "treecode_form".
            package rgn =  tcf::rgn;                                                            # "rgn" == "region" -- Aliasing info 
            package tag =  mp::heap_tags;                                                       # Mythryl heapchunk tagwords.
        herein

            fun error msg
                =
                lem::error ("nextcode-calls", msg);

            # Needs to change these when we put in 64-bit support               # XXX BUGGO FIXME
            #
            ity = 32;           #  Size of integer width 
            pty = 32;           #  Size of pointer 

            address_type = pri::address_width;

            #
            # Utilities


            # A nextcode register may be implemented as a physical 
            # register or a memory location.  This function assign
            # moves a value v into a register or a memory location.
            #
            fun assign (tcf::CODETEMP_INFO (type, r),        v) =>   tcf::LOAD_INT_REGISTER (type, r, v);
                assign (tcf::LOAD (type, ea, mem), v) =>   tcf::STORE_INT (type, ea, v, mem);
                assign _                            =>   error "assign";
            end;

            fun li i =   tcf::LITERAL (tcf::mi::from_int   (ity, i));
            fun lw w =   tcf::LITERAL (tcf::mi::from_unt1 (ity, w));

            #
            # Convert chunk descriptor to int 

            dtoi = large_unt::to_int;


            fun ea (r, 0) => r;
                ea (r, n) => tcf::ADD (address_type, r, li n);
            end;

            fun same_reg_as x y
                =
                rkj::same_id (x, y);


            #
            # Set abbreviations

            infix my 70  \/ ;
            infix my 80  /\ ;
         #  infix my 60  -- ;

            ooo         = set::empty;
            my (\/)     = set::union;

            fun unions ss
                =
                fold_backward (\/) ooo ss;

            fun def (w, s)
                =
                set::drop (s, w);


            # liveness analysis:
            # given a nextcode expression e,
            # return the set of highcode_variables that are live.
            #
            fun liveness e
                =
                {   fun use (ncf::CODETEMP v, s) =>  set::add (s, v);
                        use (_,               s) =>  s;
                    end;

                    fun uses ([],       s) =>  s;
                        uses (v ! vs,   s) =>  uses (vs, use(v, s));
                    end;

                    case e
                        #       
                        ncf::TAIL_CALL              { fn, args }              =>  uses (fn ! args, ooo);
                        ncf::JUMPTABLE              { i, nexts, ... }           =>  use(i, unions (map liveness nexts));
                        #
                        ncf::GET_FIELD_I            { record, to_temp, next, ... } =>  use(record, def (to_temp, liveness next));
                        ncf::GET_ADDRESS_OF_FIELD_I { record, to_temp, next, ... } =>  use(record, def (to_temp, liveness next));
                        #
                        ncf::DEFINE_RECORD          { fields, to_temp, next, ... } =>  uses((map #1 fields), def (to_temp, liveness next));
                        #
                        ncf::STORE_TO_RAM           { args,            next, ... } =>  uses (args,               liveness next);
                        ncf::FETCH_FROM_RAM         { args, to_temp,   next, ... } =>  uses (args, def (to_temp, liveness next));
                        #
                        ncf::ARITH                  { args, to_temp,   next, ... } =>  uses (args, def (to_temp, liveness next));
                        ncf::PURE                   { args, to_temp,   next, ... } =>  uses (args, def (to_temp, liveness next));
                        #
                        ncf::IF_THEN_ELSE     { args, then_next, else_next, ... } =>  uses (args, liveness then_next \/ liveness else_next);
                        ncf::DEFINE_FUNS _                                      =>  error "ncf::DEFINE_FNS in nextcode_c_calls_g::liveness";
                        #       
                        ncf::RAW_C_CALL { args, to_ttemps, next, ... }
                            =>
                            uses
                              ( args,
                                fold_forward
                                    (\\ ((w, _), s) = def (w, s))
                                    (liveness next)
                                    to_ttemps
                              );
                    esac;
                };


            # Pack live values into records.
            #
            # 1. Untagged stuff like INT1t or FLTt are packed into an unboxed record 
            #    with record tag four_byte_aligned_nonpointer_data_btag.  Small stuff goes first so that there 
            #    will be at most one hole in the record due to alignment.
            # 2. Tagged stuff goes into a normal record with pairs_and_records_btag.
            #
            # NOTE: live values include only the highcode_variables, not global registers
            #       like the heap pointer, base pointer, current exception pointer,
            #       etc.  
            #
            fun save_live_highcode_variables { emit, get_ncftype_for_codetemp, get_int_reg_for_ncfval, get_float_reg_for_ncfvar } (w, expression, hap_offset)   # THIS FUNCTION IS NEVER REFERENCED <==============================
                = 
                {   lll = liveness expression;          #  Compute liveness 
                    lll = def (w, lll);                 #  Remove the Variable that the RAW_C_CALL defines 
                    lll = set::vals_list lll;           #  in list form 


                    #  Store a record item:
                    #
                    fun store (v, size, FALSE) offset
                            =>
                            tcf::STORE_INT (size, ea (pri::heap_allocation_pointer, offset), get_int_reg_for_ncfval v, rgn::memory);

                        store (v, size, TRUE) offset
                            =>
                            tcf::STORE_FLOAT (size, ea (pri::heap_allocation_pointer, offset), get_float_reg_for_ncfvar v, rgn::memory);
                    end;


                    # Reload a record item 
                    #
                    fun reload (size, FALSE) (v, record, offset)
                            =>
                            tcf::LOAD_INT_REGISTER (size, v, tcf::LOAD (size, ea (record, offset), rgn::memory));

                        reload (size, TRUE) (v, record, offset)
                            =>
                            tcf::LOAD_FLOAT_REGISTER (size, v, tcf::FLOAD (size, ea (record, offset), rgn::memory));
                    end;


                    # Partition the live values
                    # into tagged and untagged:
                    #
                    fun partition ([], tagged, untagged)
                            =>
                            (tagged, untagged);

                        partition (v ! vl, tagged, untagged)
                            =>
                            {   t        =  get_ncftype_for_codetemp v;
                                size     =  ncf::size_in_bits t;
                                tag      =  ncf::is_tagged t;
                                is_float =  ncf::is_float t;
                                store    =  store (v, size, is_float);
                                load     =  reload   (size, is_float);

                                if tag   partition (vl, (store, load, size) ! tagged, untagged);
                                else     partition (vl, tagged, (store, load, size) ! untagged);
                                fi;
                            };
                    end;


                    (partition (lll, [], []))
                        ->
                        (tagged, untagged);


                    # Sort by non-decreasing size: 
                    #
                    sort_by_size
                        =
                        lms::sort_list
                            #
                            (\\ ((_, _, x), (_, _, y)) =  x > y);


                    #  Determine offset: 
                    #
                    fun assign_offset ([], ls, hap_offset)
                            =>
                            (reverse ls, hap_offset);

                        assign_offset ((v as  (_, _, size)) ! vl, ls, hap_offset)
                            => 
                            case size
                                #
                                32 => assign_offset (vl, (v, hap_offset) ! ls, hap_offset+4);                           # 64-bit issue: '4' == bytes-per-word.

                                64 =>   {   hap_offset  =   if (hap_offset % 8 == 4)   hap_offset + 4;                  # 64-bit issue: '4' == bytes-per-word.
                                                            else                       hap_offset;
                                                            fi;

                                            assign_offset (vl, (v, hap_offset) ! ls, hap_offset+8);                             # possible 64-bit issue: '8' may be 2*bytes-per-word.
                                        };

                                _  =>   error "assign_offset";
                            esac;
                    end;

                      tagged =  sort_by_size    tagged;
                    untagged =  sort_by_size  untagged;

                    ();
                };


            # This function generates code to save the Mythryl state.
            #
            fun save_restore_task ()
                =
                ();


            # This is the main entry point for C calls.
            # It takes the following things as arguments.
            #   1. A treecode->machcode codebuffer. 
            #   2. get_int_reg_for_ncfval:   Variable -> int_expression
            #   3. get_float_reg_for_ncfvar:  Variable -> float_expression
            #   4. get_ncftype_for_codetemp:    Variable -> cty
            #   5. use_virtual_framepointer:       using virtual frame pointer?
            #   6. hap_offset:  top-of-heap byte offset relative to heap_allocation_pointer register.
            #   7. arguments to RAW_C_CALL
            # The function emits the call code and returns:
            #   1. result    --- return value of call
            #   2. hap_offset  --- the updated top-of-heap byte offset relative to heap_allocation_pointer register.
            #
            fun ccall
                { treecode_to_machcode_stream =>  (buf: t2m::Treecode_Codebuffer),
                  get_int_reg_for_ncfval,
                  get_float_reg_for_ncfvar,
                  get_ncftype_for_codetemp,
                  use_virtual_framepointer, 
                  hap_offset
                } 
                ( reentrant,
                  linkage,
                  p,
                  vl,
                  wtl,
                  e
                )
                =
                {   my  { return_type, parameter_types, ... }
                        =
                        p:  cty::Cfun_Type;


                    fun build_args vl
                        = 
                        {
    #                   include package   ctypes;

                            fun m (cty::DOUBLE, v ! vl)
                                    =>
                                    ([cal::FARG (get_float_reg_for_ncfvar v)], vl);

                                m (cty::FLOAT, v ! vl)
                                    =>
                                    ([cal::FARG (tcf::FLOAT_TO_FLOAT (32, 64, get_float_reg_for_ncfvar v))], vl);

                                m (( cty::UNSIGNED ( cty::CHAR
                                                     | cty::SHORT
                                                     | cty::INT
                                                     | cty::LONG
                                                     )
                                   | cty::SIGNED   ( cty::CHAR
                                                     | cty::SHORT
                                                     | cty::INT
                                                     | cty::LONG
                                                     )
                                   | cty::PTR
                                   ),
                                   v ! vl
                                  )
                                    =>
                                    ([cal::ARG (get_int_reg_for_ncfval v)], vl);

                                m ( ( cty::STRUCT _
                                    | cty::UNION _
                                    ),
                                    v ! vl
                                  )
                                    =>
                                    ([cal::ARG (get_int_reg_for_ncfval v)], vl);                     #  pass struct using the pointer to its beginning 

                                m ( ( cty::SIGNED   cty::LONG_LONG
                                    | cty::UNSIGNED cty::LONG_LONG
                                    ),
                                    v ! vl
                                  )
                                    =>
                                    {   fun field' off
                                            =
                                            tcf::LOAD (ity, tcf::LOAD (pty, ea (get_int_reg_for_ncfval v, off), rgn::memory), rgn::memory);

                                        ([cal::ARG (field' 4), cal::ARG (field' 0)], vl);
                                    };

                                m (cty::LONG_DOUBLE, _)
                                    =>
                                    error "RAW_C_CALL: unexpected long double argument";

                                m (cty::ARRAY _, _) => error "RAW_C_CALL: unexpected array argument";
                                m (cty::VOID, _   ) => error "RAW_C_CALL: unexpected void argument";
                                m (_, []            ) => error "RAW_C_CALL: not enough Mythryl7 args";
                            end 

                            also
                            fun ml (tl, vl)
                                =
                                {   fun one (t, (ral, vl))
                                        =
                                        {   (m (t, vl)) ->   (a, vl');
                                            #
                                            (a @ ral, vl');
                                        };

                                    my  (ral, vl')
                                        =
                                        fold_forward one ([], vl) tl;

                                    (reverse ral, vl');
                               };

                            case (ml (parameter_types, vl))
                                #
                                (al, []) =>  al;
                                _        =>  error "RAW_C_CALLS: too many Mythryl7 args";
                            esac;

                        };                                        #  Build_args 

                    my  (f, sr, a)
                        =
                        case (return_type, vl)
                            #
                            ((cty::STRUCT _ | cty::UNION _), fv ! srv ! avl)
                                =>
                                {   s =   get_int_reg_for_ncfval srv;

                                    ( get_int_reg_for_ncfval fv,
                                      \\ _ = s,
                                      build_args avl
                                    );
                                };

                            (_, fv ! avl)
                                =>
                                ( get_int_reg_for_ncfval fv,
                                  \\ _ = error "RAW_C_CALL: unexpected struct return",
                                  build_args avl
                                );

                            _   => error "RAW_C_CALL: prototype/arglist mismatch";
                        esac;

                    fun srd defs
                        =
                        loop (defs, [], [])
                        where
                            fun loop ([], s, r)
                                    =>
                                    { save => s, restore => r };

                                loop (tcf::INT_EXPRESSION (tcf::CODETEMP_INFO (type, g)) ! l, s, r)
                                    =>
                                    if (list::exists (same_reg_as g) pri::ccall_caller_save_r)
                                        #
                                        t =   rgk::make_int_codetemp_info ();

                                        loop (l, tcf::MOVE_INT_REGISTERS (type, [t], [g]) ! s,
                                                 tcf::MOVE_INT_REGISTERS (type, [g], [t]) ! r);

                                    else
                                        loop (l, s, r);
                                   fi;

                                loop (tcf::FLOAT_EXPRESSION (tcf::CODETEMP_INFO_FLOAT (type, f)) ! l, s, r)
                                    =>
                                    if (list::exists (same_reg_as f) pri::ccall_caller_save_f)
                                        #
                                        t =   rgk::make_float_codetemp_info ();

                                        loop (l, tcf::MOVE_FLOAT_REGISTERS (type, [t], [f]) ! s,
                                                 tcf::MOVE_FLOAT_REGISTERS (type, [f], [t]) ! r);
                                    else
                                        loop (l, s, r);
                                    fi;

                               loop _
                                    =>
                                    error "save_restore_global_registers: unexpected def";
                            end;
                        end;                            #  srd 

                    param_allot
                        =
                        case (mp::ccall_prealloc_argspace_in_bytes)
                            #
                            NULL => (\\ { szb, align } =  FALSE);
                            #
                            THE s => (\\ { szb, align }
                                          =
                                          if (szb > s )
                                              error "argument list in C-call too big";
                                          else
                                              TRUE;
                                          fi);
                        esac;

                    my  { callseq, result }
                        =
                        cal::make_inline_c_call
                            { name         => f,
                              fn_prototype => p,
                              struct_ret   => sr,
                              save_restore_global_registers => srd,
                              param_allot,
                              call_comment => THE ("C prototype is: " + cprototype::c_prototype_to_string p),
                              args => a
                            };

                    fun with_hostthread f
                        =
                        {   framepointer =   pri::framepointer use_virtual_framepointer;

                            task     =   tcf::LOAD (address_type, ea (framepointer, mp::task_offset), rgn::stack);

                            hostthread  =   tcf::LOAD (address_type, ea (task, mp::hostthread_offtask), rgn::memory);
                            hostthread' =   tcf::CODETEMP_INFO  (address_type, rgk::make_int_codetemp_info ());

                            in_lib7  =   tcf::LOAD (ity, ea (hostthread', mp::in_lib7off_vsp), rgn::memory);

                            limit_ptr_mask
                                =
                                tcf::LOAD (32, ea (hostthread', mp::limit_ptr_mask_off_vsp),
                                        rgn::memory);

                            #  Move hostthread to its register:
                            #
                            buf.put_op (assign (hostthread', hostthread));

                            f { in_lib7, limit_ptr_mask };

                        };                                              # fun with_hostthread

                    #  Prepare to leave Mythryl
                    #
                    with_hostthread (\\ { in_lib7, limit_ptr_mask }
                                =
                                {   buf.put_op (assign (limit_ptr_mask, lw 0uxffffffff));                               #  Set ccall_limit_pointer_mask to -1   XXX BUGGO FIXME this hardwires an assumed wordsize!
                                    #
                                    buf.put_op (assign (in_lib7, lw 0u0));                                              #  Set vp_inLib7 to 0 
                                }
                             );


                    # Now do the actual call! 
                    #
                    apply  buf.put_op  callseq;


                    # Return to Mythryl, restore proper heap_allocation_limit pointer: 
                    #
                    with_hostthread (\\ { in_lib7, limit_ptr_mask }
                                =
                                {   buf.put_op (assign (in_lib7, lw 0u1));                                              #  set vp_inLib7 back to 1 

                                    buf.put_op (assign (pri::heap_allocation_limit  use_virtual_framepointer,
                                               tcf::BITWISE_AND (pty, limit_ptr_mask,
                                                            pri::heap_allocation_limit  use_virtual_framepointer)));    #  heap_allocation_limit := heap_allocation_limit & ccall_limit_pointer_mask 
                                }
                             );

                    #  Find result: 
                    #
                    result = 
                        case (result, return_type)
                            #
                            (([] | [_]), (cty::VOID | cty::STRUCT _ | cty::UNION _))
                                =>
                                [];
                            #
                            ([], _)                                       =>   error "RAW_C_CALL: unexpectedly few results";
                            ([     tcf::FLOAT_EXPRESSION x], cty::FLOAT ) =>   [tcf::FLOAT_EXPRESSION (tcf::FLOAT_TO_FLOAT (64, 32, x))];
                            ([r as tcf::FLOAT_EXPRESSION x], cty::DOUBLE) =>   [r];
                            ([     tcf::FLOAT_EXPRESSION _], _)           =>   error "RAW_C_CALL: unexpected floating point result";

                            #
                            ( [ r1 as tcf::INT_EXPRESSION _,
                                r2 as tcf::INT_EXPRESSION _
                              ],

                              ( cty::SIGNED   cty::LONG_LONG 
                              | cty::UNSIGNED cty::LONG_LONG
                              )
                            )
                                 =>
                                 [r1, r2];

                            ([r as tcf::INT_EXPRESSION x], _)
                                =>
                                [r];                                    #  more sanity checking here ?  XXX BUGGO FIXME

                           _ => error "RAW_C_CALL: unexpectedly many results";
                       esac;

                    { result, hap_offset };
                };                                                              # fun ccall 

        end;
    };                                                                  # generic package nextcode_c_calls_g 
end;


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