path: root/system/eumel-coder/1.8.1/src/eumel coder 1.8.1

PACKET eumel coder                                 (* Autor: U. Bartling *) 
       DEFINES coder on, coder off,
               declare, define, apply, identify,
               :=, =,
               dump,
 
               LIB,

               LABEL,
               gosub, goret,
               computed branch,
               complement condition code,

               ADDRESS ,
               GLOB, LOC, REF, DEREF,
               ref length,
               +, 
               adjust,
               get base,
               is global, is local, is ref,
 
               DTYPE, 
               type class, type name,
               void type, int type, real type, text type, bool type, 
               bool result type, dataspace type, undefined type, 
               row type, struct type, proc type, end type,
 
               OPN, 
               set length of local storage, 
               begin module, end module, 
               is proc, is eumel 0 instruction,
               address, operation,
               nop, 
               mnemonic, 

               parameter,
               next param,
               NEXTPARAM, 
               access , 
               dtype , 
               param address,
               same type ,
 
               reserve storage, 
               allocate denoter , 
               allocate variable, 
               data allocation by coder ,
               data allocation by user,
 
               run, run again, 
               insert,
               prot, prot off,
               check, check on, check off,

               help, bulletin, packets,

(**************************************************************************)
(*                                                                        *) 
(*                         E U M E L  -  C O D E R                        *) 
(*                                                                        *) 
(*                                                                        *) 
(*   Zur Beschreibung des Coders siehe                                    *) 
(*         U.Bartling, J. Liedtke: EUMEL-Coder-Interface                  *) 
(*                                                                        *) 
(*   Stand der Dokumentation  : 29.10.1986                                *) 
(*   Stand der Implementation : 03.09.1986                                *) 
(*                                                                        *) 
(*                                                                        *) 
(**************************************************************************) 
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  0. Datentyp DINT                          03.09.1987  *) 
(*                                                                        *) 
(*   Definition    des Datentyps                                          *) 
(*                 arithmetischer Operationen                             *) 
(*            und  Konvertierungsprozeduren                               *) 
(*                                                                        *) 
(**************************************************************************) 


               DINT,
               -, *, DIV, MOD, <, <=,
               AND, OR, XOR,
               dput, dget, dmov,
               ddec1, dinc1, dinc, ddec,
               dadd, dsub,
               dequ, dlseq,
               INCR, DECR,
               put, get, cout,
               text, real, int, dint,
               replace, DSUB :
 
 
TYPE DINT = STRUCT (INT low, high) ; 


REAL VAR   real value ;           (* auch fuer Ausrichtung ! *)
TEXT VAR convertion buffer ;

DINT CONST dint0 :: dint(0) ;
DINT VAR result  :: dint 0 ;
  
 
DINT PROC dint (INT CONST number) : 
    EXTERNAL 144
ENDPROC dint ; 

INT PROC int (DINT CONST i) : 
    EXTERNAL 143
ENDPROC int;

REAL PROC real (DINT CONST number) : 
    real value := 65536.0 * real (number.high) ; 

    IF   number.low >= 0 
    THEN real value INCR real (number.low) 
    ELSE real value INCR (real (number.low AND maxint) + 32768.0) 
    FI ; 
    real value
ENDPROC real ; 

DINT PROC dint (REAL CONST number) : 
    real value := abs (number) ;
    REAL CONST low := real value MOD 65536.0 ; 
   
    result.high := int(real value / 65536.0) ; 
    IF   low < 32768.0 
    THEN result.low := int (low)
    ELSE result.low := int (low-32768.0) OR minint
    FI ;
    IF number < 0.0 THEN dsub (dint0, result, result) FI ;
    result
ENDPROC dint ; 

TEXT PROC text (DINT CONST number) :
    IF number.high = 0 THEN convert low part only
                       ELSE convert number 
    FI ; 
    convertion buffer .
 
convert low part only : 
    IF number.low >= 0 THEN convertion buffer := text (number.low) 
                       ELSE convertion buffer := text (real of low) ;
                            erase decimal point
    FI . 

real of low : 
    real (number.low AND maxint) + 32768.0 .

convert number : 
    convertion buffer := text (real(number)) ;
    erase decimal point .

erase decimal point :
    convertion buffer := subtext (convertion buffer, 1, LENGTH convertion buffer-2)
ENDPROC text;

DINT PROC dint (TEXT CONST dint txt) :
    convertion buffer := dint txt ;
    INT CONST dot pos :: pos (convertion buffer, ".") ; 
    IF dot pos = 0 THEN convertion buffer CAT ".0" FI ;
    dint (real(convertion buffer))
ENDPROC dint ;

PROC get (DINT VAR dest) : 
    REAL VAR number ;
    get (number) ;
    dest := dint (number)
ENDPROC get ; 

PROC put (DINT CONST number) : 
    put (text (number));
ENDPROC put ; 

PROC cout (DINT CONST number) : 
    EXTERNAL 61
ENDPROC cout;

OP := (DINT VAR a, DINT CONST b) : 
#   INLINE ;   #
    dmov (b, a); 
ENDOP :=;

OP INCR (DINT VAR a, DINT CONST b) : 
#   INLINE ;   #
    dinc (b, a); 
ENDOP INCR;
 
OP DECR (DINT VAR a, DINT CONST b) : 
#   INLINE ;   #
    ddec (b, a); 
ENDOP DECR;

BOOL OP = (DINT CONST a, b) : 
    EXTERNAL 137 
ENDOP =;

BOOL OP <= (DINT CONST a, b) : 
    EXTERNAL 138 
ENDOP <=;

BOOL OP < (DINT CONST a, b) :
#   INLINE ;   #
    NOT (b <= a)
ENDOP <;

BOOL PROC dequ (DINT CONST a, b) : 
    EXTERNAL 137 
ENDPROC dequ ;

BOOL PROC dlseq (DINT CONST a, b) : 
    EXTERNAL 138 
ENDPROC dlseq ;

PROC replace (TEXT VAR text, INT CONST index of dint, DINT CONST value) :
    INT VAR subscript := index of dint * 2 ;
    replace (text, subscript - 1,value.low); 
    replace (text, subscript, value.high); 
ENDPROC replace;

DINT OP DSUB (TEXT CONST text, INT CONST index of dint) : 
    INT  VAR subscript := index of dint * 2 ;
    result.low  := text ISUB subscript - 1; 
    result.high := text ISUB subscript;
    result
ENDOP DSUB;

DINT OP + (DINT CONST a, b) :
    EXTERNAL 135 
ENDOP + ;
 
DINT OP - (DINT CONST a, b) :
    EXTERNAL 136 
ENDOP - ;

PROC dadd (DINT CONST a, b, DINT VAR res) :
    EXTERNAL 135 
ENDPROC dadd ;
 
PROC dsub (DINT CONST a, b, DINT VAR res) :
    EXTERNAL 136
ENDPROC dsub ;

PROC dinc (DINT CONST source, DINT VAR dest) : 
    EXTERNAL 133 
ENDPROC dinc ; 
 
PROC ddec (DINT CONST source, DINT VAR dest) : 
    EXTERNAL 134 
ENDPROC ddec ; 
 
PROC dmov (DINT CONST source, DINT VAR dest) : 
    EXTERNAL 130 
ENDPROC dmov; 

DINT OP DIV (DINT CONST a,b) :
    EXTERNAL 152
ENDOP DIV ;

DINT OP MOD (DINT CONST a,b) :
    EXTERNAL 153
ENDOP MOD ;

DINT OP AND (DINT CONST a,b) :
    result.low  := a.low  AND b.low ;
    result.high := a.high AND b.high ;
    result
ENDOP AND ;

DINT OP OR (DINT CONST a,b) :
    result.low  := a.low  OR b.low ;
    result.high := a.high OR b.high ;
    result
ENDOP OR ;

DINT OP XOR (DINT CONST a,b) :
    result.low  := a.low  XOR b.low ;
    result.high := a.high XOR b.high ;
    result
ENDOP XOR ;

PROC dput (ROW 32000 DINT VAR array, DINT CONST index, value) : 
    EXTERNAL 139 
ENDPROC dput ; 
 
PROC dget (ROW 32000 DINT VAR array, DINT CONST index, DINT VAR dest) : 
    EXTERNAL 140 
ENDPROC dget ; 

PROC dinc1 (DINT VAR dest) : 
    EXTERNAL 131 
ENDPROC dinc1 ; 
 
PROC ddec1 (DINT VAR dest) :
    EXTERNAL 132 
ENDPROC ddec1 ; 

DINT OP * (DINT CONST a,b) :
    EXTERNAL 151
ENDOP * ; 

#page#
                   (***** Globale Variable *****) 

TEXT VAR object name;
 
FILE VAR bulletin file; 
 
INT VAR memory management mode, global address offset, packet base,
        hash table pointer, nt link, permanent pointer, param link,
        packet link, index, mode, field pointer, word,
        number of errors := 0 ;
 
BOOL VAR found, end of params;
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  1. Interface zum ELAN-Compiler            13.11.1986  *) 
(*                              1.8.1                                     *) 
(*                                                                        *) 
(*   Beschreibung der      Tabellen (-groessen),                          *) 
(*                         internen Vercodung von Typen                   *) 
(*                    und  Kennungen .                                    *) 
(*   Initialisieren und Beenden des Compilers,                            *) 
(*   Lesen aus und Schreiben in Namens- bzw. Permanent-Tabelle            *) 
(*                                                                        *) 
(**************************************************************************) 
 

TYPE LIB = STRUCT (TEXT name, INT nt link, pt link, ADDRESS base) ;

LET  begin of hash table         =     0 ,
     end of hash table           =  1023 ,
 
     begin of permanent table    = 22784 ,
       before first pt entry     = 22784 ,
       first permanent entry     = 22785 ,
     end of permanent table      = 32767 , 

     wordlength                  =     1 ,  (* compile  u n d  run time *)
     two word length             =     2 ,
     three word length           =     3 ,
     four word length            =     4 ,
 
     permanent param const             = 10000 ,
     permanent param var               = 20000 ,
     permanent proc op                 = 30000 ,
     permanent type                    = 30000 ,
     permanent row                     =    10 ,
     permanent struct                  =    11 ,
     permanent param proc              =    12 ,
     permanent param proc end marker   =     0 ,
     permanent type field              =     0 ,

     ptt limit                         = 10000 ,
     begin of pt minus ptt limit       = 12784 ,
     begin of pt minus ptt limit 1     = 12785 , (* plus wordlength *)
 
     void id                           =     0 ,
     int id                            =     1 ,
     real id                           =     2 ,
     string id                         =     3 ,
     bool id                           =     5 ,
     bool result id                    =     6 ,
     dataspace id                      =     7 ,
     undefined id                      =     9 ,
     row id                            =    10 ,
     struct id                         =    11 ,
     end id                            =     0 ,

     const                             =     1 , 
     var                               =     2 ,
     proc id                           =     3 ,
(*   denoter                           =     5 , *)
     bold                              =     2 ,
 
     ins                               = TRUE ,
     no ins                            = FALSE ,
     no lst                            = FALSE ,
     sermon                            = TRUE  ,
     no sermon                         = FALSE ,
 
     run again mode                    =     0 ,
     compile file mode                 =     1 ,
     prep coder mode                   =     5 , 

     warning message                   =     2 , 
     error message                     =     4 ,
 
     point line                        = "..............." ;
 
INT CONST permanent packet            :=     -2 ,
          permanent end               :=     -3 ;

BOOL VAR coder active                 := FALSE ; 

INT  VAR run again mod nr             :=     0 ;
 
 
                     (***** Start/Ende *****)
 
LET coder not active      = "CODER not active" ,
    illegal define packet = "illegal define packet" ;

PROC coder on (INT CONST data allocation mode) : 
    mark coder on ; 
    init opn section ; 
    init compiler ;
    init memory management .
 
mark coder on :
    coder active := TRUE .

init memory management :
    memory management mode := data allocation mode .
 
init compiler :
    no do again ;
    elan (prep coder mode, bulletin file, "", run again mod nr,
          no ins, no lst, check option, no sermon)

ENDPROC coder on;
 
PROC coder off (BOOL CONST insert, sermon, OPN CONST start proc) :
    IF coder active 
       THEN mark coder off ; 
            end coder (insert, sermon, start mod nr if no insert)
       ELSE errorstop (coder not active)
    FI .
 
start mod nr if no insert :
    IF insert THEN run again mod nr := 0
              ELSE run again mod nr := start proc.mod nr
    FI ;
    run again mod nr .

mark coder off :
    reset memory management mode ;
    init opn section ;
    coder active := FALSE
ENDPROC coder off ; 
 
PROC end coder (BOOL CONST insert wanted, sermon wanted, INT CONST mod) :
    EXTERNAL 10021
ENDPROC end coder ; 

PROC elan (INT CONST mode, FILE VAR source, TEXT CONST line, 
           INT VAR start module number, BOOL CONST ins, lst, rtc, ser) :
  EXTERNAL 256
ENDPROC elan ;

PROC unsigned arithmetic : 
    EXTERNAL 92 
ENDPROC unsigned arithmetic ;
 

                   (*****    Paket-Rahmen    *****)

PROC declare (TEXT CONST name, LIB VAR packet) :
    packet.name := name
ENDPROC declare ;

PROC define (LIB VAR packet) :
    check if definition possible ;
    declare object (packet.name, packet.nt link, packet.pt link) ;
    open packet (packet.nt link, global address offset, packet base) ;
    set to actual base (packet) .

check if definition possible :
    IF NOT coder active THEN errorstop (coder not active) FI ;
    IF module open      THEN errorstop (illegal define packet) FI
ENDPROC define ;

PROC open packet (INT CONST nt link of packet name, INT VAR offset, base) :
    EXTERNAL 10032 
ENDPROC open packet ;

PROC identify (TEXT CONST name, LIB VAR packet, BOOL VAR packet exists) :
     to packet (name) ;
     packet exists := found ;
     IF found THEN packet.name    := name ;
                   packet.nt link := nt link ;
                   packet.pt link := packet link ;
                   get pbas (packet.base)
     FI
ENDPROC identify ;

 
                   (***** Hash/Namenstabelle *****) 
.
next hash entry :
     hash table pointer INCR wordlength .

end of hash table reached :
     hash table pointer > end of hash table .

yet another nt entry :
     nt link := cdb int (nt link) ;
     nt link <> 0 . ;
 
PROC declare object (TEXT CONST name, INT VAR nt link, pt pointer) : 
    EXTERNAL 10031
ENDPROC declare object ; 
 
PROC to object (TEXT CONST searched object) : 
     hash ;
     search nt entry .

hash :
     hash code := 0 ;
     FOR index FROM 1 UPTO LENGTH searched object REP
         addmult cyclic
     ENDREP .

addmult cyclic :
     hash code INCR hash code ;
     IF hash code > end of hash table THEN wrap around FI ;
     hash code := (hash code + code (searched object SUB index)) MOD 1024 .

wrap around :
     hash code DECR end of hash table .

hash code : nt link .

search nt entry :
     found := FALSE ;
     WHILE yet another nt entry REP
          read current entry ;
          IF object name = searched object 
             THEN found := TRUE ;
                  LEAVE to object
          FI
     PER .

read current entry :
     permanent pointer := cdb int (nt link + wordlength) ;
     object name := cdb text (nt link + two word length)
ENDPROC to object ;


                 (***** Permanent Tabelle *****) 
.
next procedure :
     permanent pointer := cdb int (permanent pointer) . ;

PROC next pt param :
     mode := cdb int (param link) MOD ptt limit ;
     param link INCR wordlength ;
     IF   mode = permanent row    THEN skip over permanent row 
     ELIF mode = permanent struct THEN skip over permanent struct
     FI ;
     set end marker if end of list .

skip over permanent row :
     param link INCR wordlength ;
     next pt param .

skip over permanent struct :
     REP
         mode := cdb int (param link) ;
         IF mode = permanent type field
            THEN param link INCR wordlength ;
                 LEAVE skip over permanent struct
         FI ;
         next pt param
     PER
ENDPROC next pt param ;

PROC set end marker if end of list :
     mode := cdb int (param link) ;
     end of params := mode >= permanent proc op OR mode <= 0 
ENDPROC set end marker if end of list ;

PROC get type and mode (INT VAR type) : 
     mode := cdb int (param link) ;
     IF   mode < 0                    THEN type := 2769 + (32767 + mode) ;
                                           mode := 0
     ELIF mode = permanent param proc THEN translate type
                                      ELSE type := mode MOD ptt limit ;
                                           mode DECR type ;
                                           translate type if necessary ;
                                           translate mode if necessary 
     FI .

translate type if necessary :
     IF permanent row or struct THEN translate type FI .

translate type :
     type := param link - begin of pt minus ptt limit .

translate mode if necessary : 
    IF   mode = permanent param const THEN mode := const
    ELIF mode = permanent param var   THEN mode := var
    FI .

permanent row or struct :
     type = permanent row OR type = permanent struct
ENDPROC get type and mode ;

PROC put next permanent (INT CONST permanent value) : 
    EXTERNAL 10020
ENDPROC put next permanent ; 
 

                 (***** Allgemeine Zugriffsprozeduren *****) 

INT PROC cdb int (INT CONST index) :
   EXTERNAL 116
ENDPROC cdb int ;

TEXT PROC cdb text (INT CONST index) :
   EXTERNAL 117
ENDPROC cdb text ;
 

#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  2. Spruenge und Marken                    07.10.1986  *) 
(*                                                                        *) 
(*   Definition des Datentyps LABEL                                       *) 
(*                                                                        *) 
(*   Deklaration, Definition und Applikation von Marken                   *) 
(*                                                                        *) 
(**************************************************************************) 



TYPE LABEL = INT ; 

BOOL VAR invers :: FALSE ; 
 
PROC declare (LABEL VAR label) : 
    CONCR (label) := 0
ENDPROC declare ; 
 
PROC define (LABEL VAR label) : 
    EXTERNAL 10085
ENDPROC define ; 
 
PROC complement condition code : 
    invers := NOT invers
ENDPROC complement condition code ; 
 
PROC apply (LABEL VAR label) : 
    EXTERNAL 10151
ENDPROC apply ; 
 
PROC apply (LABEL VAR label, BOOL CONST condition) : 
    IF condition xor invers THEN branch true (label) 
                            ELSE branch false (label)
    FI ;
    invers := FALSE .

condition xor invers : 
    IF condition THEN NOT invers
                 ELSE invers
    FI
ENDPROC apply ; 
 
OP := (LABEL VAR global label, local label) : (* EQUATE ! *)
    EXTERNAL 10014 
ENDOP := ; 
 
TEXT PROC dump (LABEL CONST label) : 
    "LAB " + text (CONCR (label)) 
ENDPROC dump ; 
 
PROC gosub (LABEL VAR label) : 
    EXTERNAL 10015 
ENDPROC gosub ; 
 
PROC goret : 
    s0 (q goret code) 
ENDPROC goret ; 
 
PROC branch true (LABEL VAR label) : 
    EXTERNAL 10028
ENDPROC branch true ; 
 
PROC branch false (LABEL VAR label) : 
    EXTERNAL 10029
ENDPROC branch false ; 

PROC computed branch (ADDRESS CONST switch, INT CONST limit, LABEL VAR out) :
    s1 (q esc case, REPR switch) ;
    s0 (limit) ; 
    branch false (out)
ENDPROC computed branch ;
 
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  3. Datenaddressen                         13.11.1986  *) 
(*                                                                        *) 
(*   Definition des Datentyps ADDRESS                                     *) 
(*                                                                        *) 
(*   Aufbau von Datenaddressen (Vercodung)                                *) 
(*   Fortschalten und Ausrichten von Adressen                             *) 
(*   Behandlung von Paketbasis-Adressen                                   *) 
(*   Bereitstellen der Fehlermeldung "address overflow" (Coder-intern)    *) 
(*                                                                        *) 
(**************************************************************************) 
 
 
 
TYPE ADDRESS = STRUCT (INT kind, value) ; 
 
LET global                 = 0 , 
    local                  = 1 , 
    ref mask               = 2 , 
    global ref             = 2 , 
    local ref              = 3 , 
    module nr              = 4 ,
    immediate value        = 5 ,
    p base                 = 6 ,
 
    eumel0 stack offset    = 4 ,
    local address limit    = 16 384 ,
    global address zero    = 0 ,
 
    illegal ref operation  = "REF not allowed" , 
    deref on non ref       = "DEREF on non-ref address" ,
    global ref not allowed = "GLOBAL REF not allowed" , 
    unknown kind           = "Unknown address kind" , 
    address overflow       = "Address Overflow" , 
    illegal plus operation = "+ not allowed" ;
 
ADDRESS VAR result addr;
 
INT CONST ref length :: 2 ;

OP := (ADDRESS VAR l, ADDRESS CONST r) : 
    CONCR (l) := CONCR (r) 
ENDOP := ; 
 
ADDRESS OP GLOB (INT CONST address level) : 
    result addr.kind  := global ; 
    result addr.value := address level ; 
    IF memory management mode = data allocation by user
       THEN result addr.value INCR global address offset
    FI ;
    result addr
ENDOP GLOB ;

ADDRESS OP LOC (INT CONST address level) : 
    result addr.kind  := local ;
    result addr.value := address level + eumel0 stack offset ; 
    result addr
ENDOP LOC ; 
 
ADDRESS OP REF (ADDRESS CONST addr) : 
    CONCR (result addr) := CONCR (addr) ;
    IF   result addr.kind = local  THEN result addr.kind INCR ref mask
    ELIF result addr.kind = global THEN errorstop (global ref not allowed)
                                   ELSE errorstop (illegal ref operation)
    FI ;
    result addr 
ENDOP REF ; 
 
ADDRESS OP DEREF (ADDRESS CONST ref address) : 
    CONCR (result addr) := CONCR (ref address) ;
    IF is not local ref THEN errorstop (deref on non ref) FI ; 
    result addr.kind DECR ref mask ; 
    result addr .
 
is not local ref :
    result addr.kind <> local ref
ENDOP DEREF ;
 
INT OP REPR (ADDRESS CONST addr) : 
    CONCR (result addr) := CONCR (addr) ;
    SELECT result addr.kind OF 
        CASE global     :
        CASE local      : set bit (result addr.value, 15) 
        CASE global ref : errorstop (global ref not allowed)
        CASE local ref  : prep local ref 
        OTHERWISE errorstop (unknown kind)
    ENDSELECT ; 
    result addr.value .
 
prep local ref : 
    IF address limit exceeded THEN errorstop (address overflow) FI ;
    set bit (result addr.value, 14) ; 
    set bit (result addr.value, 15) .

address limit exceeded :
    result addr.value < eumel0 stack offset OR
    result addr.value > local address limit
ENDOP REPR ; 
 
PROC get base (LIB CONST packet, ADDRESS VAR base) :
    CONCR (base) := CONCR (packet.base)
ENDPROC get base ;

PROC set to actual base (LIB VAR packet) :
    packet.base.kind  := p base ;
    packet.base.value := packet base
ENDPROC set to actual base ;

PROC get pbas (ADDRESS VAR base) :
    base.kind  := p base ;
    base.value := cdbint (packet link + 2)
ENDPROC get pbas ;

BOOL OP = (ADDRESS CONST l,r) :
    l.kind = r.kind AND l.value = r.value
ENDOP = ;

BOOL PROC is ref (ADDRESS CONST addr) : 
    addr.kind = local ref
ENDPROC is ref ; 
 
BOOL PROC is global (ADDRESS CONST addr) : 
    addr.kind = global 
ENDPROC is global ; 
 
BOOL PROC is local (ADDRESS CONST addr) : 
    addr.kind = local 
ENDPROC is local ; 
 
ADDRESS OP + (ADDRESS CONST addr, INT CONST offset) : 
    CONCR (result addr) := CONCR (addr) ; 
    SELECT result addr.kind OF 
        CASE global : inc global
        CASE local  : inc local
        OTHERWISE     errorstop (illegal plus operation) 
    ENDSELECT ; 
    result addr .

inc global : 
    result addr.value INCR offset ; 
    IF result addr.value < 0 THEN errorstop (address overflow) FI .
 
inc local : 
    result addr.value INCR offset ; 
    IF result addr.value < eumel 0 stack offset OR
       result addr.value > local address limit
       THEN errorstop (address overflow)
    FI
ENDOP + ; 
 
PROC adjust (ADDRESS VAR addr, INT CONST adjust length) :
    IF is local or global THEN adjust to length FI . 
 
is local or global :
    addr.kind <= local .

adjust to length :
    mode := addr.value MOD adjust length ;
    IF mode <> 0 THEN addr.value INCR (adjust length-mode) FI
ENDPROC adjust ;

TEXT PROC dump (ADDRESS CONST addr) : 
    kind + text (addr.value) . 
 
kind : 
    SELECT addr.kind OF 
        CASE global          : "GLOBAL " 
        CASE local           : "LOCAL " 
        CASE immediate value : "IMMEDIATE "
        CASE module nr       : "PARAM PROC "
        CASE global ref      : "GLOBAL REF " 
        CASE local ref       : "LOCAL REF " 
        CASE p base          : "PBAS "
        OTHERWISE              "undef. Addr: " 
    ENDSELECT 
ENDPROC dump; 


#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  4. Datentypen   Teil I                    08.09.1986  *) 
(*                                                                        *) 
(*   Definition des Datentyps DTYPE                                       *) 
(*                                                                        *) 
(*   Interne Repraesentation der primitiven Datentypen                    *) 
(*   Identifikation von DTYPEs                                            *)
(*                                                                        *) 
(**************************************************************************) 



TYPE DTYPE = INT ; 
 
OP := (DTYPE VAR l, DTYPE CONST r) : 
    CONCR (l) := CONCR (r) 
ENDOP := ; 
 
BOOL OP = (DTYPE CONST l, r) : 
    CONCR (l) = CONCR (r)
ENDOP = ; 
 
DTYPE PROC void type :      DTYPE :(void id)   ENDPROC  void type ; 
 
DTYPE PROC int  type :      DTYPE :(int id)    ENDPROC  int type ; 
 
DTYPE PROC real type :      DTYPE :(real id)   ENDPROC  real type ; 
 
DTYPE PROC text type :      DTYPE :(string id) ENDPROC  text type ; 
 
DTYPE PROC bool type :      DTYPE :(bool id)   ENDPROC  bool type ; 
 
DTYPE PROC bool result type : DTYPE :(bool result id) ENDPROC  bool result type; 
 
DTYPE PROC dataspace type : DTYPE :(dataspace id) ENDPROC dataspace type ; 
 
DTYPE PROC undefined type : DTYPE :(undefined id) ENDPROC undefined type ; 
 
DTYPE PROC row type  :      DTYPE :(row id)    ENDPROC row type ; 
 
DTYPE PROC struct type :    DTYPE :(struct id) ENDPROC struct type ; 
 
DTYPE PROC proc type :   DTYPE :(permanent param proc) ENDPROC proc type ; 
 
DTYPE PROC end type  :      DTYPE :(end id)    ENDPROC end type ; 
 
INT PROC type class (DTYPE CONST type) : 
    SELECT type id OF 
        CASE int id, real id, bool id, bool result id, string id,
             dataspace id, undefined id : 1 
        CASE void id   : 0 
        CASE row id    : 3 
        CASE struct id : 4 
        CASE permanent param  proc : 5 
        OTHERWISE     pt type 
    ENDSELECT . 

pt type :
    IF type id > ptt limit THEN permanent row or struct
                           ELSE abstract type
    FI .

abstract type : 2 .

permanent row or struct :
    unsigned arithmetic ;
    mode := cdbint (type link into pt) MOD ptt limit ; 
    IF   mode = struct id            THEN 4
    ELIF mode = row id               THEN 3
    ELIF mode = permanent param proc THEN 5
                                     ELSE 2
    FI .
 
type link into pt :
    type id + begin of pt minus ptt limit .

type id : CONCR (type)
ENDPROC type class ; 
 
PROC identify (TEXT CONST name,INT VAR size, align, DTYPE VAR type) : 
    SELECT type pos OF 
          CASE 1   : size := 0; align := 0; type id := void id
          CASE 6   : size := 1; align := 1; type id := int id
          CASE 10  : size := 4; align := 4; type id := real id
          CASE 15  : size := 8; align := 4; type id := string id
          CASE 20  : size := 1; align := 1; type id := bool id
          CASE 25  : size := 1; align := 1; type id := dataspace id
          OTHERWISE  search for type in permanent table 
    ENDSELECT . 
 
type pos : 
    enclose in delimiters ;
    pos (".VOID.INT.REAL.TEXT.BOOL.DATASPACE.", object name) . 
 
enclose in delimiters :
    object name := "." ;
    object name CAT name ;
    object name CAT "." .

search for type in permanent table : 
    to object (name) ;
    IF not found THEN size := 0; align := 0; type id := undefined id
                 ELSE size := cdbint (permanent pointer + two wordlength) ;
                      type id := permanent pointer - begin of permanent table ;
                      IF   size < two wordlength  THEN align := 1
                      ELIF size < four wordlength THEN align := 2
                                                  ELSE align := 4
                      FI
    FI . 
 
not found :
    NOT found OR invalid entry .

invalid entry :
    permanent pointer = 0 OR
    cdb int (permanent pointer + wordlength) <> permanent type .

type id : CONCR (type)
ENDPROC identify ; 
 
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  5. Operationen  Teil I                    30.09.1986  *) 
(*                                                                        *) 
(*   Definition des Datentyps OPN                                         *) 
(*   Primitive Operationen (:=  etc.)                                     *) 
(*   Initialisieren mit den externen Namen der EUMEL-0-Codes              *) 
(*   Bereitstellen dee Fehlermeldung 'proc op expected' (coder-intern)    *) 
(*                                                                        *) 
(**************************************************************************) 


TYPE OPN = STRUCT (INT kind, mod nr, top of stack) ;
 
LET proc op    = 0 ,
    param proc = 1 ,
    eumel 0    = 2 , 
    nil        = 3 , 
 
    param proc at non ref = "PARAM PROC at non-ref address" ,
    proc op expected      = "PROC expected" ;
 
OPN VAR eumel0 opn;
eumel0 opn.kind := eumel0 ;
eumel0 opn.top of stack := 0 ;

eumel0 opn.mod nr := q pp ;
OPN CONST pp       :: eumel0 opn ,
          nop code :: OPN :(nil, 0, 0) ;

IF NOT exists ("eumel0 codes")
    THEN IF yes ("Archive 'eumel coder' eingelegt")
             THEN archive ("eumel coder") ;
                  fetch ("eumel0 codes", archive) ;
                  release (archive)
             ELSE errorstop ("""eumel0 codes"" gibt es nicht")
         FI
FI ;
BOUND THESAURUS VAR initial opcodes :: old ("eumel0 codes") ;
THESAURUS VAR eumel 0 opcodes :: initial opcodes ; 
forget ("eumel0 codes") ;
 
ADDRESS PROC address (OPN CONST opn) :
    IF opn.kind <> proc op THEN errorstop (proc op expected) FI ;
    result addr.kind  := module nr ; 
    result addr.value := opn.mod nr ;
    result addr
ENDPROC address ;
 
OPN PROC operation (ADDRESS CONST addr) : 
    IF addr.kind <> local ref THEN errorstop (param proc at non ref) FI ; 
    OPN VAR opn ;
    opn.kind := param proc ; 
    opn.mod nr :=addr.value ; 
    opn.top of stack := 0 ; 
    opn 
ENDPROC operation ; 
 
TEXT PROC mnemonic (OPN CONST op code) : 
    name (eumel 0 opcodes, op code.mod nr)
ENDPROC mnemonic ;
 
OPN PROC nop : 
    nop code
ENDPROC nop ; 
 
OP := (OPN VAR r, OPN CONST l) : 
    CONCR (r) := CONCR (l) 
ENDOP := ; 
 
BOOL PROC is proc (OPN CONST operation) : 
    operation.kind = proc op
ENDPROC is proc ; 
 
BOOL PROC is eumel 0 instruction (TEXT CONST op code name) : 
    link (eumel 0 opcodes, op code name) <> 0
ENDPROC is eumel 0 instruction ; 

BOOL PROC is eumel 0 instruction (OPN CONST operation) : 
    operation.kind = eumel0
ENDPROC is eumel 0 instruction ; 
 

#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  6. Parameterfeld                          10.04.1986  *) 
(*                                                                        *) 
(*   Bereitstellen des Parameterfeldes                                    *) 
(*   Schreiben und Lesen von Eintraegen im Parameterfeld                  *) 
(*   Fortschalten von Zeigern in das Parameterfeld                        *) 
(*   Bereitstellen der Konstanten 'size of param field' (Coder-intern)    *) 
(*                                                                        *) 
(**************************************************************************) 



LET PARAMDESCRIPTOR = STRUCT (DTYPE type,   INT access, 
                              ADDRESS addr, OPN push opn) , 
 
    size of param field   = 100 ,
    param field exceeded  = "Param Field Overflow",
    param nr out of range = "Illegal Param Number" ;
 
ROW size of param field PARAMDESCRIPTOR VAR param field ;
 
 
                      (***** Schreiben *****) 
 
PROC test param pos (INT CONST param nr) : 
    IF param nr < 1 OR param nr > size of param field
       THEN errorstop (param nr out of range)
    FI 
ENDPROC test param pos ; 
 
PROC declare (INT CONST param nr, DTYPE CONST type) : 
    test param pos (param nr) ; 
    enter type . 
 
enter type :
    CONCR (param field [param nr].type) := CONCR (type) 
ENDPROC declare ; 
 
PROC declare (INT CONST param nr, access) : 
    test param pos (param nr) ; 
    enter access . 

enter access :
    param field [param nr].access := access 
ENDPROC declare ; 
 
PROC define (INT CONST param nr, ADDRESS CONST addr) : 
    test param pos (param nr) ; 
    enter address . 

enter address :
    CONCR (param field [param nr].addr) := CONCR (addr) 
ENDPROC define ; 
 
PROC define (INT CONST param nr, value) : 
    result addr.kind  := immediate value ;
    result addr.value := value ;
    define (param nr, result addr) 
ENDPROC define ; 
 
PROC apply (INT CONST param nr, OPN CONST opn) : 
    test param pos (param nr) ; 
    enter push opn . 
 
enter push opn : 
    CONCR (param field [param nr].push opn) := CONCR (opn) 
ENDPROC apply ; 
 
PROC parameter (INT CONST param nr, DTYPE CONST type, 
                INT CONST access, ADDRESS CONST addr) : 
    test param pos (param nr) ; 
    enter type ; 
    enter access ; 
    enter address ; 
    enter pp as default . 
 
enter type : 
    CONCR (param field [param nr].type) := CONCR (type) .

enter access :
    param field [param nr].access := access .

enter address :
    CONCR (param field [param nr].addr) := CONCR (addr) .

enter pp as default :
    CONCR (param field [param nr].push opn) := CONCR (pp) 
ENDPROC parameter ; 
 
 
                       (***** Lesen *****) 
 
ADDRESS PROC param address (INT CONST param nr) : 
    test param pos (param nr) ; 
    param field [param nr].addr 
ENDPROC param address ; 
 
DTYPE PROC dtype (INT CONST param nr) : 
    test param pos (param nr) ; 
    param field [param nr].type 
ENDPROC dtype ; 
 
INT PROC access (INT CONST param nr) : 
    test param pos (param nr) ; 
    param field [param nr].access 
ENDPROC access ; 
 
 
                      (***** Fortschalten *****) 
 
OP NEXTPARAM (INT VAR param nr) : 
   test param pos (param nr) ; 
   INT CONST class :: type class (param field [param nr].type) ;
   param nr INCR 1 ;
   SELECT class OF
       CASE 3    : NEXTPARAM param nr
       CASE 4,5  : read until end 
    ENDSELECT .

read until end : 
    WHILE NOT end marker read or end of field REP
        NEXTPARAM param nr 
    PER ;
    param nr INCR 1 .
 
end marker read or end of field :
    param nr > size of param field OR
    CONCR (param field [param nr].type) = end id
ENDOP NEXTPARAM ; 
 
INT PROC next param (INT CONST p) : 
    INT VAR index := p ; 
    NEXTPARAM index ; 
    index
ENDPROC next param ; 
 
TEXT PROC dump (INT CONST p) : 
   IF p > 0 AND p <= 100 THEN dump entry (param field (p)) 
                         ELSE param nr out of range 
    FI 
ENDPROC dump ; 
 
TEXT PROC dump entry (PARAMDESCRIPTOR CONST id) : 
(*  object name :=  dump (id.type) ; *)
    object name :=  "TYPE " ;           (*  siehe                         *)
    object name CAT dump (id.type) ;    (*    TEXT PROC dump (DTYPE d)    *)
    object name CAT text (id.access) ; 
    object name CAT dump (id.addr) ; 
    object name CAT dump (id.push opn) ;
    object name
ENDPROC dump entry ; 

 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  7. Datentypen   Teil II                   08.09.1986  *) 
(*                                                                        *) 
(*   Deklaration neuer Datentypen                                         *) 
(*   Vergleich von DTYPEs im Parameterfeld und in der Permanent-Tabelle   *) 
(*                                                                        *) 
(**************************************************************************) 



DTYPE VAR pt type ;

PROC declare (TEXT CONST name, INT CONST size, align, DTYPE VAR type) : 
    entry into name table ; 
    put next permanent (permanent type) ; 
    put next permanent (size) ; 
    put next permanent (nt link) ;
    mark no offsets of text elements . 
 
entry into name table : 
    declare object (name, nt link, CONCR (type)) ;
    CONCR (type) DECR begin of permanent table .
 
mark no offsets of text elements : 
    put next permanent (0) 
ENDPROC declare ; 
 
BOOL PROC same type (INT CONST param 1, param 2) : 
    INT CONST left type :: CONCR (param field [param 1].type) ;
    IF left type = right type
       THEN same fine structure if there is one
       ELSE left type = undefined id OR right type = undefined id
    FI .
 
right type : CONCR (param field [param 2].type) . 
 
same fine structure if there is one : 
    IF   left type = row id     THEN compare row 
    ELIF left is struct or proc THEN compare struct 
                                ELSE TRUE 
    FI . 
 
left is struct or proc :
    left type = struct id OR left type = proc id .

compare row : 
    equal sizes AND same type (param1 + 1, param2 + 1) . 
 
equal sizes : 
    param field [param1+1].access = param field [param2+1].access .
 
compare struct : 
    INT VAR p1 :: param1+1, p2 :: param2+1 ; 
    WHILE same type (p1, p2) AND NOT end type found REP
       NEXTPARAM p1 ;
       NEXTPARAM p2
    UNTIL end of field PER ;
    FALSE .

end type found :
    CONCR (param field [p1].type) = end id .

end of field : 
    p1 > size of param field OR p2 > size of param field 
ENDPROC same type ;
 
BOOL PROC same type (INT CONST param nr, DTYPE CONST type) : 
    field pointer := param nr ;
    CONCR (pt type) := CONCR (type) ;
    equal types 
ENDPROC same type ;

BOOL PROC equal types :
    identical types OR one type is undefined .

one type is undefined :
    type of actual field = undefined id OR CONCR(pt type) = undefined id .

identical types :
    SELECT type class (pt type) OF 
        CASE 0, 1, 2 : type of actual field = CONCR (pt type)
        CASE 3       : perhaps equal rows
        CASE 4       : perhaps equal structs
        CASE 5       : perhaps equal param procs
        OTHERWISE      FALSE
    ENDSELECT .

perhaps equal rows :
    param link := CONCR (pt type) + begin of pt minus ptt limit ;
    is row AND equal row sizes AND equal row types . 
 
is row :
    type of actual field = row id .

perhaps equal structs : 
    param link := CONCR (pt type) + begin of pt minus ptt limit ;
    is struct AND same type fields . 
 
is struct :
    type of actual field = struct id .

equal row sizes :
    pt row size = row size within param field . 

equal row types :
    field pointer INCR 1 ;
    param link INCR 2 ;
    get type and mode (CONCR(pt type)) ;
    equal types .

pt row size :
    cdb int (param link + 1) .

row size within param field :
    param field [field pointer + 1].access .
 
same type fields :
    REP
        field pointer INCR 1 ;
        param link INCR 1 ;
        IF type of actual field = end id
             THEN LEAVE same type fields WITH pt struct end reached
        FI ; 
        get type and mode (CONCR(pt type)) ;
        IF NOT equal types THEN LEAVE same type fields WITH FALSE FI
    UNTIL end of field PER ;
    FALSE .

pt struct end reached : 
    cdbint (param link) = permanent type field . 
 
end of field :
    field pointer > size of param field .

type of actual field :
    CONCR (param field [field pointer].type) .

perhaps equal param procs :
    param link := CONCR (pt type) + begin of pt minus ptt limit ;
    is proc AND same param list . 

is proc : cdbint (param link) = permanent param proc .

same param list :
    param link INCR wordlength ;
    DTYPE VAR proc result type ;
    get type and mode (CONCR (proc result type)) ;
    compare param list ;
    check results .

compare param list :
    INT VAR last param := field pointer + 1 ;
    REP
        field pointer INCR 1 ;
        param link INCR wordlength ;
        IF pt param list exhausted THEN LEAVE compare param list FI ; 
        IF type of actual field = end id 
           THEN LEAVE equal types WITH FALSE
        FI ; 
        get type and mode (CONCR(pt type)) ;
        last param := field pointer ;
    UNTIL NOT equal types OR end of field PER .

check results : 
    pt param list exhausted AND equal result types .

equal result types :
    save param link ;
    IF same type (last param, proc result type)
       THEN restore ;
            TRUE
       ELSE FALSE
    FI .

pt param list exhausted :
    cdbint (param link) = permanent param proc end marker .

save param link :
    INT CONST p :: param link .

restore :
    field pointer INCR 1 ;
    param link := p

ENDPROC equal types ;

BOOL PROC is not void bool or undefined (DTYPE CONST dtype) :
    type <> void id AND type <> bool result id AND type <> undefined id .

type : CONCR (dtype)
ENDPROC is not void bool or undefined ;
 

#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  8. Operationen  Teil II                   08.09.1986  *) 
(*                                                                        *) 
(*   Definition der Opcodes                                               *) 
(*   Deklaration, Definition, Identifikation und Applikation              *) 
(*   Eroeffnen und Schliessen eines Moduls                                *)
(*                                                                        *) 
(**************************************************************************) 
 
 
 
LET module not opened  = "Module not opened" , 
    define missing     = "DEFINE missing" ,
    wrong nr of params = "Wrong Nr. of Params:" , 
    illegal kind       = "Opcode expected" ,
    nested module      = "Nested Modules" ,
    no mod nr          = "Param Proc expected" ,
    no immediate value = "Value expected" ,
    type error         = "Type Error" ,
 
    q ln              =  1 ,
    q move            =  2 ,    q move code             =  2 048 ,
    q inc1            =  3 ,    q inc1 code             =  3 072 ,
    q dec1            =  4 ,    q dec1 code             =  4 096 ,
    q inc             =  5 ,    q inc code              =  5 120 ,
    q dec             =  6 ,    q dec code              =  6 144 ,
    q add             =  7 ,    q add code              =  7 168 ,
    q sub             =  8 ,    q sub code              =  8 192 ,
    q clear           =  9 ,    q clear code            =  9 216 ,
    q test            = 10 , 
    q equ             = 11 ,    q equ code              = 11 264 , 
    q lsequ           = 12 ,    q lsequ code            = 12 288 , 
    q fmove           = 13 ,    q fmove code            = 13 312 , 
    q fadd            = 14 ,    q fadd code             = 14 336 , 
    q fsub            = 15 ,    q fsub code             = 15 360 , 
    q fmult           = 16 ,    q fmult code            = 16 384 , 
    q fdiv            = 17 ,    q fdiv code             = 17 408 ,
    q flsequ          = 18 ,    q flsequ code           = 18 432 ,
    q tmove           = 19 ,    q tmove code            = 19 456 ,
    q tequ            = 20 ,    q tequ code             = 20 480 , 
    q accds           = 21 ,    q access ds code        = 22 528 , 
    q ref             = 22 ,    q ref code              = 23 552 ,
    q subscript       = 23 ,    q subscript code        = 24 576 , 
    q select          = 24 ,    q select code           = 25 600 ,
    q ppv             = 25 ,    q ppv code              = 26 624 ,
    q pp              = 26 , 
    q make false      = 27 , (* q make false code       = 65 513 *)
    q movex           = 28 ,
(*  q longa subs                q longa subs code       = 65 376 *) 
    q return          = 29 ,    q return code           = 32 512 ,
    q true return     = 30 ,    q true return code      = 32 513 ,
    q false return    = 31 ,    q false return code     = 32 514 ,
                                q goret code            = 32 519 ,
    q esc mult        = 32 ,    q esc mult code         = 32 553 ,
    q esc div         = 33 ,    q esc div code          = 32 554 , 
    q esc mod         = 34 ,    q esc mod code          = 32 555 , 
    q pproc           = 35 , 
    q compl int       = 36 ,    q compl int code        = 32 551 ,
    q compl real      = 37 ,    q compl real code       = 32 550 ,
    q alias ds        = 38 ,    q alias ds code         = 32 546 ,
    q movim           = 39 ,    q esc movim code        = 32 547 ,
    q fequ            = 40 ,    q fequ code             = 32 548 ,
    q tlsequ          = 41 ,    q tlsequ code           = 32 549 ,
(*  q case            = 42 , *) q esc case              = 32 544 ,
    q plus            = 43 ,
    q minus           = 44 ,
    q mult            = 45 ,
    q int div         = 46 ,
    q real div        = 47 ,
    q equal           = 48 ,
    q lessequal       = 49 ,
    q ulseq           = 50 ,    q ulseq code            = 21 504 ,
    q pdadd           = 51 ,    q pdadd code            = 32 653 ,
    q ppsub           = 52 ,    q ppsub code            = 32 654 ,
    q dimov           = 53 ,    q dimov code            = 32 655 ,
    q idmov           = 54 ,    q idmov code            = 32 656 ;

INT CONST q make false code :: - 1 022 , 
          q longa subs code :: -   159 ,
          q penter code     :: -   511 ;
 

                   (***** Deklaration *****) 
 
PROC declare (OPN VAR operation) : 
    operation.kind := proc op ;
    get module nr (operation.mod nr) ; 
    operation.top of stack := 0 
ENDPROC declare ; 
 
PROC declare (TEXT CONST name, INT CONST first, params, OPN VAR operation) : 
    declare (operation) ;
    entry into name and pt table if necessary ; 
    enter params ; 
    enter result ; 
    enter module number . 
 
entry into name and pt table if necessary : 
    declare object (name, nt link, permanent pointer) . 
 
enter params : 
    field pointer := first ;
    FOR index FROM 1 UPTO params REP
       enter param (param field [field pointer]) ;
       NEXTPARAM field pointer 
    PER .
 
enter result : 
    enter param (param field[field pointer].type, permanent proc op) .
 
enter module number : 
    put next permanent (operation.mod nr)
ENDPROC declare ; 
 
PROC enter param (PARAMDESCRIPTOR CONST param) :
    IF   param.access = const 
         THEN enter param (param.type, permanent param const)
    ELIF param.access = var 
         THEN enter param (param.type, permanent param var)
    ELSE errorstop ("Unknown Access")
    FI
ENDPROC enter param ;

PROC enter param (DTYPE CONST type, INT CONST permanent mode) :
    unsigned arithmetic ;
    SELECT type class (type) OF
        CASE 0, 1, 2 : put next permanent (CONCR(type) + permanent mode)
        OTHERWISE      errorstop ("Illegal Type")
    ENDSELECT
ENDPROC enter param ;


                    (***** Definition *****) 
 
PROC define (OPN VAR opn) : 
    IF NOT module open THEN errorstop (module not opened)
                       ELSE proc head (opn.mod nr, opn.top of stack)
    FI 
ENDPROC define ; 
 
PROC set length of local storage (OPN VAR opn, INT CONST size) :
    IF   size < 0 OR size > local address limit
         THEN errorstop (address overflow)
    ELIF opn.top of stack = 0
         THEN errorstop (define missing)
    ELIF opn.kind <> proc op
         THEN errorstop (proc op expected)
    FI ;
    set length (opn.top of stack, size + eumel0 stack offset)
ENDPROC set length of local storage ; 
 
PROC define (OPN VAR operation, INT CONST size) : 
    define (operation) ; 
    set length of local storage (operation, size)
ENDPROC define ; 
 
 
                 (***** Identifikation *****) 
 
INT VAR counter, result index, result type repr;
 
PROC identify (TEXT CONST name, INT CONST first, params, OPN VAR operation,
               BOOL VAR object exists) :
    find result entry ; 
    to object (name) ;
    IF found  THEN first fit and leave if found FI ; 
    IF eumel0 THEN identify eumel0 instruction 
              ELSE yield undefined operation 
    FI .
 
find result entry : 
    result index := first; 
    counter := 0 ;
    WHILE counter < params REP 
        NEXTPARAM result index ; 
        counter INCR 1
    PER ;
    check on param field exceeded .

check on param field exceeded :
    IF result index > size of param field
       THEN errorstop (param field exceeded) 
    FI .
 
yield undefined operation :
    declare (result index, undefined type) ;
    apply (result index, nop) ;
    object exists := FALSE .
 
first fit and leave if found :
    WHILE yet another procedure exists REP 
        check one procedure and leave if match ; 
        next procedure 
    PER . 
 
yet another procedure exists : 
    permanent pointer <> 0 . 
 
check one procedure and leave if match: 
    param link := permanent pointer + wordlength ; 
    set end marker if end of list ;
    counter := params ; 
    field pointer := first ;
    REP
       IF   end of params AND counter = 0 
            THEN procedure found
       ELIF end of params OR  counter = 0 
            THEN LEAVE check one procedure and leave if match 
            ELSE check next param 
       FI 
   PER . 
 
check next param : 
    get type and mode (CONCR(pt type)) ;
    IF same types THEN set param mode ; 
                       field pointer INCR 1 ;
                       param link INCR 1 ;
                       set end marker if end of list ;
                       counter DECR 1 ; 
                  ELSE LEAVE check one procedure and leave if match 
    FI . 
 
same types : (* inline version ! *)
    equal types .
 
set param mode : 
    param field [field pointer].access := mode . 
 
procedure found : 
    get result ; 
    operation.kind   := proc op ; 
    operation.mod nr := module number ; 
    operation.top of stack := 0 ;
    object exists := TRUE ;
    LEAVE identify . 
 
get result : 
    get type and mode (result type) ; 
    declare (result index, mode) .
 
module number :
    cdbint (param link + 1) . 

result type :
    CONCR (param field [result index].type) .
 
eumel0 : 
    eumel0 opn.mod nr := link (eumel 0 opcodes, name) ; 
    eumel0 opn.mod nr <> 0 .
 
identify eumel 0 instruction : 
    init result type with void ; 
    CONCR (operation) := CONCR (eumel0 opn) ;
    object exists := check params and set result ;
    declare (result index, DTYPE:(result type repr)) ;
    declare (result index, const) .

init result type with void :
    result type repr := void id . 
 
check params and set result :
    SELECT operation.mod nr OF
       CASE q return, q false return, q true return : no params 
       CASE q inc1, q dec1          : one int param yielding void 
       CASE q pproc, q pp, q ln     : one param yielding void
       CASE q test                  : one param yielding bool
       CASE q clear, q ppv          : one int or bool param yielding void 
       CASE q make false            : one bool param yielding void 
       CASE q move                  : two int or bool params yielding void 
       CASE q compl int, q inc, q dec : two int params yielding void
       CASE q compl real, q fmove   : two real params yielding void 
       CASE q equ, q lsequ, q ulseq : two int params yielding bool 
       CASE q fequ, q flsequ        : two real params yielding bool 
       CASE q tequ, q tlsequ        : two text params yielding bool
       CASE q tmove                 : two text params yielding void
       CASE q accds, q ref, q movim,
            q dimov, q idmov        : two params yielding void
       CASE q add, q sub, q esc mult,
            q esc div, q esc mod    : three int params yielding void
       CASE q fadd, q fsub, q fmult, q fdiv : three real params yielding void
       CASE q select, q movex, q alias ds,
            q pdadd, q ppsub        : three params 
       CASE q subscript             : five params 
       CASE q plus, q mult          : two intreals yielding intreal
       CASE q minus                 : monadic or dyadic minus
       CASE q int div               : two int params yielding int 
       CASE q real div              : two real params yielding real
       CASE q equal, q lessequal    : two intrealtexts yielding bool
       OTHERWISE                      FALSE
    ENDSELECT .
 
no params : 
    params = 0 . 

one int param yielding void : 
    p1 void (int type, first, params) .

one param yielding void :
    params = 1 . 

one param yielding bool :
    IF params = 1 THEN result type repr := bool id ; 
                       TRUE 
                  ELSE FALSE
    FI .
 
one int or bool param yielding void :
    p1 void (int type, first, params) OR p1 void (bool type, first, params) . 

one bool param yielding void :
    p1 void (bool type, first, params) . 
 
two int or bool params yielding void : 
    p2 (int  type, first, params, void id) OR
    p2 (bool type, first, params, void id) .

two int params yielding void :
    p2 (int type, first, params, void id) .

two real params yielding void :
    p2 (real type, first, params, void id) .

two text params yielding void :
    p2 (text type, first, params, void id) .

two int params yielding bool :
    p2 (int type, first, params, bool id) .

two real params yielding bool :
    p2 (real type, first, params, bool id) .

two text params yielding bool :
    p2 (text type, first, params, bool id) .

two params yielding void :
    params = 2 . 

three int params yielding void :
    p3 void (int type, first, params) .

three real params yielding void :
    p3 void (real type, first, params) .

three params :
    params = 3 .

five params : 
    params = 5 . 

two intreals yielding intreal :
    two int params yielding int OR two real params yielding real .

monadic or dyadic minus :
    IF   params = 2 THEN two intreals yielding intreal
    ELIF params = 1 THEN monadic minus
                    ELSE FALSE
    FI .

monadic minus :
    result type repr := CONCR (param field[first].type) ;
    result type repr = int id OR result type repr = real id .

two intrealtexts yielding bool :
    two int params yielding bool OR two real params yielding bool OR
    two text params yielding bool .

two int params yielding int :
    p2 (int type, first, params, int id) .

two real params yielding real :
    p2 (real type, first, params, real id)
ENDPROC identify ; 
 
BOOL PROC p1 void (DTYPE CONST requested type, INT CONST first, param nr) :
    param nr = 1 AND param type is requested plain type . 
 
param type is requested plain type :
    CONCR (param field [first].type) = CONCR (requested type) 
 
ENDPROC p1 void ;
 
BOOL PROC p2 (DTYPE CONST requested type, INT CONST first, param nr,
              INT CONST result type) :
    IF param nr = 2 AND param types equal requested plain type
       THEN result type repr := result type ;
            TRUE
       ELSE FALSE
    FI .
 
param types equal requested plain type :
    CONCR (param field [first]  .type) = CONCR (requested type) AND 
    CONCR (param field [first+1].type) = CONCR (requested type)

ENDPROC p2 ;
 
BOOL PROC p3 void (DTYPE CONST requested type, INT CONST first, param nr) :
    param nr = 3 AND param types ok .
 
param types ok :
    FOR index FROM first UPTO first+2 REP
       IF different param types THEN LEAVE p3 void WITH FALSE FI 
    PER ;
    TRUE .
 
different param types :
    CONCR (param field [index].type) <> CONCR (requested type)
ENDPROC p3 void; 


                   (***** Applikation *****) 
 
INT VAR address representation, left repr, right repr, result repr;

PROC apply (INT CONST first, nr of params, OPN CONST opn) : 
    IF NOT module open THEN errorstop (module not opened) FI ;
    SELECT opn.kind OF 
        CASE eumel 0    : generate eumel0 instruction 
        CASE proc op    : call operation 
        CASE param proc : call param proc
        CASE nil        :
        OTHERWISE         errorstop (illegal kind) 
    ENDSELECT .
 
call operation :
    push params if necessary (first, nr of params, opn.mod nr) ; 
    call (opn.mod nr) .
 
call param proc : 
    result addr.kind := local ref ;
    result addr.value := opn.mod nr ;
    INT CONST module nr := REPR result addr ;
    push params if necessary (first, nr of params, module nr) ;
    call param (module nr) .

generate eumel0 instruction : 
    SELECT real nr of params OF 
        CASE 0 : p0 instruction 
        CASE 1 : apply p1 (opn, first addr) 
        CASE 2 : apply p2 (opn, first addr, second addr)
        CASE 3 : apply p3 (opn, left type, first addr, second addr, third addr) 
        CASE 5 : subscript operation
        OTHERWISE errorstop (wrong nr of params + text (nr of params)) 
    ENDSELECT . 
 
real nr of params :
    IF operator denotation THEN nr of params + 1
                           ELSE nr of params
    FI .

operator denotation :
    opn.mod nr >= q plus AND opn.mod nr < q ulseq .

p0 instruction :
    IF   opn.mod nr = q return       THEN s0 (q return code) 
    ELIF opn.mod nr = q true return  THEN s0 (q true return code)
    ELIF opn.mod nr = q false return THEN s0 (q false return code)
                                     ELSE errorstop (wrong nr of params +
                                                     mnemonic (opn)) 
    FI .
 
subscript operation :
    IF opn.mod nr = q subscript 
       THEN subscription
       ELSE errorstop (wrong nr of params + text (nr of params))
    FI .

subscription :
    ADDRESS CONST element length :: param field [first+2].addr ,
                  limit          :: param field [first+3].addr ;
    check on immediates ;
    IF element length.value < 1024
       THEN s0 (q subscript code + element length.value)
       ELSE s0 (q longa subs code) ;
            s0 (element length.value)
    FI ;
    s3 (limit.value - 1, subs index, base addr, subs result) .

check on immediates :
    IF element length.kind <> immediate value OR
       limit.kind <> immediate value
       THEN errorstop (no immediate value)
    FI .

subs index  : REPR param field [first+1].addr .

base addr   : REPR param field [first].addr .

subs result : REPR param field [first+4].addr .

first addr : 
    param field [first].addr .
 
left type :
    param field [first].type .

second addr : 
    param field [nextparam (first)].addr .
 
third addr : 
    param field [nextparam(nextparam(first))].addr
ENDPROC apply ;
 
PROC push params if necessary (INT CONST first, nr of params, mod nr) : 
    init param push (mod nr) ;
    field pointer := first ;
    IF nr of params > 0 THEN push params FI ;
    push result if there is one .
 
push params : 
    FOR index FROM 1 UPTO nr of params REP 
        apply p1 (push code, param addr) ; 
        NEXTPARAM field pointer
    PER . 
 
push code : 
    param field [field pointer].push opn . 
 
param addr :
    param field [field pointer].addr . 
 
push result if there is one : 
    IF push result necessary 
       THEN push result address (REPR param field [field pointer].addr)
    FI . 

push result necessary :
    param field [field pointer].push opn.kind <> nil AND 
    is not void bool or undefined (param field [field pointer].type) 
ENDPROC push params if necessary ;

PROC apply p1 (OPN CONST opn, ADDRESS CONST addr) : 
    IF   opn.mod nr = q ln    THEN generate line number 
    ELIF opn.mod nr = q pproc THEN push module nr
                              ELSE gen p1 instruction
    FI .

gen p1 instruction : 
    address representation := REPR addr ;
    SELECT opn.mod nr OF 
        CASE q inc1  : t1 (q inc1 code, address representation)
        CASE q dec1  : t1 (q dec1 code, address representation)
        CASE q clear : t1 (q clear code,address representation)
        CASE q test  : test bool object (address representation)
        CASE q pp    : push param (address representation)
        CASE q ppv   : s1 (q ppv code, address representation)
        CASE q make false : s1 (q make false code, address representation)
        OTHERWISE errorstop (wrong nr of params + mnemonic (opn))
    ENDSELECT .

generate line number :
    IF addr.kind = immediate value THEN mark line (addr.value)
                                   ELSE errorstop (no immediate value)
    FI .

push module nr : 
    IF addr.kind = module nr THEN push param proc (addr.value)
                             ELSE errorstop (no mod nr)
    FI
ENDPROC apply p1; 
 
PROC apply p2 (OPN CONST opn, ADDRESS CONST left addr, right addr): 
    left repr := REPR left addr ;
    IF opn.mod nr = q movim THEN move immediate
                            ELSE gen p2 instruction 
    FI . 
 
gen p2 instruction : 
    right repr := REPR right addr ;
    SELECT opn.mod nr OF 
        CASE q move       : t2 (q move code, right repr, left repr)
        CASE q inc        : t2 (q inc code, right repr, left repr) 
        CASE q dec        : t2 (q dec code, right repr, left repr) 
        CASE q equ        : compare (q equ code, left repr, right repr) 
        CASE q lsequ      : compare (q lsequ code, left repr, right repr) 
        CASE q ulseq      : compare (q ulseq code, left repr, right repr)
        CASE q fmove      : t2 (q fmove code, right repr, left repr)
        CASE q flsequ     : compare (q flsequ code, left repr, right repr) 
        CASE q tmove      : t2 (q tmove code, right repr, left repr)
        CASE q tequ       : compare (q tequ code, left repr, right repr) 
        CASE q compl int  : s2 (q compl int code, left repr, right repr)
        CASE q compl real : s2 (q compl real code, left repr, right repr)
        CASE q fequ       : compare (q fequ code, left repr, right repr) 
        CASE q tlsequ     : compare (q tlsequ code, left repr, right repr) 
        CASE q accds      : t2 (q access ds code, left repr, right repr)
        CASE q ref        : t2 (q ref code, left repr, right repr) 
        CASE q dimov      : s2 (q dimov code, left repr, right repr)
        CASE q idmov      : s2 (q idmov code, left repr, right repr)
        OTHERWISE errorstop (wrong nr of params + mnemonic (opn))
    ENDSELECT .
 
move immediate :
    IF right addr.kind = immediate value 
       THEN s0 (q esc movim code) ;
            s1 (right addr.value, left repr)
       ELSE errorstop (no immediate value)
    FI
ENDPROC apply p2; 
 
PROC apply p3 (OPN CONST opn, DTYPE CONST left dtype, 
               ADDRESS CONST left addr, right addr, result addr ):
    result repr := REPR result addr ;
    IF   opn.mod nr = q pdadd  THEN select with dint; LEAVE apply p3
    ELIF opn.mod nr = q select THEN gen select instruction; LEAVE apply p3 FI ;
    left repr   := REPR left addr ; 
    IF   opn.mod nr = q movex    THEN gen long move
    ELIF opn.mod nr = q alias ds THEN alias dataspace
                                 ELSE gen p3 instruction
    FI .

gen long move :
    IF right addr.kind = immediate value
       THEN long move (left repr, result repr, right addr.value)
       ELSE errorstop (no immediate value)
    FI .

alias dataspace :
    IF right addr.value = immediate value
       THEN s0 (q alias ds code) ;
            s2 (right addr.value, result repr, left repr)
       ELSE errorstop (no immediate value)
    FI .

gen select instruction :
    IF right addr.kind = immediate value 
       THEN IF different bases
               THEN access external (left addr.value, right addr.value)
               ELSE t1 (q select code, REPR left addr) ;
                    s1 (right addr.value, result repr)
            FI
       ELSE errorstop (no immediate value)
    FI .

select with dint :
    right repr := REPR right addr ;
    IF different bases THEN access external packet
                       ELSE simple access
    FI .

different bases :
    left addr.kind = p base AND left addr.value <> packet base .

simple access :
    s3 (q pdadd code, REPR left addr, right repr, result repr) .

access external packet :
    access external (left addr.value, global address zero) ;
    s3 (q pdadd code, REPR REF result addr, right repr, result repr) .

gen p3 instruction :
    right repr  := REPR right addr ; 
    SELECT opn.mod nr OF 
        CASE q add                : int add
        CASE q sub                : int sub
        CASE q fadd               : real add 
        CASE q fsub               : real sub 
        CASE q fmult              : real mult 
        CASE q fdiv, q real div   : real div 
        CASE q esc mult           : int mult 
        CASE q esc div, q int div : int div 
        CASE q esc mod            : int mod 
        CASE q plus               : int real add
        CASE q minus              : int real sub
        CASE q mult               : int real mult
        CASE q equal, q lessequal : compare (comp code, left repr, right repr)
        CASE q ppsub              : distance between two objects
        OTHERWISE errorstop (wrong nr of params + mnemonic (opn))
    ENDSELECT . 
 
int add   : compute (q add code, left repr, right repr, result repr) . 
 
int sub   : compute (q sub code, left repr, right repr, result repr) . 
 
real add  : compute (q fadd code, left repr, right repr, result repr) . 
 
real sub  : compute (q fsub code, left repr, right repr, result repr) . 
 
real mult : compute (q fmult code, left repr, right repr, result repr) . 
 
real div  : compute (q fdiv code, left repr, right repr, result repr) . 
 
int mult  : s3 (q esc mult code, left repr, right repr, result repr) . 
 
int div   : s3 (q esc div code, left repr, right repr, result repr) . 
 
int mod   : s3 (q esc mod code, left repr, right repr, result repr) .
 
int real add : 
    IF left type = int id THEN int add
                          ELSE real add
    FI . 
 
int real sub :
    IF left type = int id THEN int sub 
                           ELSE real sub
    FI .

int real mult :
    IF left type = int id THEN int mult
                          ELSE real mult
    FI . 

comp code : 
    SELECT left type OF
        CASE int id    : IF opn.mod nr = q equal THEN q equ  ELSE q lsequ FI 
        CASE real id   : IF opn.mod nr = q equal THEN q fequ ELSE q flsequ FI
        CASE string id : IF opn.mod nr = q equal THEN q tequ ELSE q tlsequ FI
        OTHERWISE errorstop (type error); q equ
    ENDSELECT .

left type : CONCR (left dtype) .

distance between two objects :
    s3 (q ppsub code, left repr, right repr, result repr)

ENDPROC apply p3; 
 
PROC access external (INT CONST old base, offset) :
    s0 (q penter code + old base) ;
    t2 (q ref code, offset, result repr) ;
    s0 (q penter code + packet base)
ENDPROC access external ;


                      (***** Modul *****) 
 
BOOL VAR module open ;

.init opn section : 
    module open := FALSE .;

PROC begin module : 
    IF module open THEN errorstop (nested module) 
                   ELSE begin modul ; 
                        module open := TRUE 
    FI 
ENDPROC begin module ; 
 
PROC end module : 
    IF NOT module open
       THEN errorstop (module not opened) 
       ELSE end modul ;
            module open := FALSE
    FI
ENDPROC end module ; 

TEXT PROC dump (OPN CONST operation) : 
    IF   operation.kind = proc op THEN " PROC" + text (operation.mod nr, 5) 
    ELIF operation.kind = eumel 0 THEN " EUMEL0: " + mnemonic (operation)
                                  ELSE " undef. Opn" 
    FI 
ENDPROC dump ; 
 
PROC begin modul :
    EXTERNAL 10073
ENDPROC begin modul ; 
 
PROC end modul :
    EXTERNAL 10011
ENDPROC end modul ; 
 
PROC proc head (INT VAR mod nr, top of stack) :
    EXTERNAL 10012
ENDPROC proc head ; 
 
PROC set length (INT CONST top of stack, size) : 
    EXTERNAL 10013
ENDPROC set length ; 
 
PROC get module nr (INT VAR module nr) : 
    EXTERNAL 10016
ENDPROC get module nr ; 
 
PROC compute (INT CONST op code, l addr, r addr, result address) :
    EXTERNAL 10017
ENDPROC compute ; 
 
PROC compare (INT CONST op code, l addr, r addr) :
    EXTERNAL 10018
ENDPROC compare ; 
 
PROC long move (INT CONST to, from, length) :
    EXTERNAL 10019
ENDPROC long move ;

PROC call (INT CONST mod nr) : 
    EXTERNAL 10022
ENDPROC call ; 
 
PROC call param (INT CONST mod nr) : 
    EXTERNAL 10023
ENDPROC call param ; 
 
PROC push param (INT CONST addr) : 
    EXTERNAL 10024
ENDPROC push param ; 
 
PROC push param proc (INT CONST mod nr) : 
    EXTERNAL 10025
ENDPROC push param proc ; 
 
PROC init param push (INT CONST mod nr) : 
    EXTERNAL 10026
ENDPROC init param push ; 
 
PROC push result address (INT CONST addr) : 
    EXTERNAL 10027
ENDPROC push result address ; 
 
PROC test bool object (INT CONST addr) : 
    EXTERNAL 10192
ENDPROC test bool object ; 
 
PROC mark line (INT CONST line number) : 
    EXTERNAL 10030
ENDPROC mark line ; 
 
PROC s0 (INT CONST op code) : 
    EXTERNAL 10038
ENDPROC s0 ; 
 
PROC s1 (INT CONST op code, addr) : 
    EXTERNAL 10039
ENDPROC s1 ; 
 
PROC s2 (INT CONST op code , addr1, addr2) : 
    EXTERNAL 10040
ENDPROC s2 ; 
 
PROC s3 (INT CONST op code, addr1, addr2, addr3) : 
    EXTERNAL 10041
ENDPROC s3 ; 
 
PROC t1 (INT CONST op code, addr) : 
    EXTERNAL 10042
ENDPROC t1 ; 
 
PROC t2 (INT CONST op code, addr1, addr2) : 
    EXTERNAL 10043
ENDPROC t2 ; 
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                  9. Speicherverwaltung                     03.06.1986  *) 
(*                                                                        *) 
(*   Ablage der Paketdaten                                                *) 
(*                                                                        *) 
(**************************************************************************) 



INT VAR address value;
 
INT CONST data allocation by coder  := 1 , 
          data allocation by user   := 2 ; 

LET not initialized      = 0 ,
    wrong mm mode        = "Wrong MM Mode" ,
    define on non global = "Define for GLOB only" ,
    text too long        = "TEXT too long" ;
 
TEXT VAR const buffer :: point line ;

.reset memory management mode :
     memory management mode := not initialized . ;
 
PROC reserve storage (INT CONST size) : 
    IF memory management mode <> data allocation by user 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate var (address value, size) ; 
    memory management mode := not initialized
ENDPROC reserve storage ; 
 
PROC allocate variable (ADDRESS VAR addr, INT CONST size) : 
    IF memory management mode <> data allocation by coder 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate var (addr.value, size) ;
    addr.kind := global
ENDPROC allocate variable ; 
 
PROC allocate denoter (ADDRESS VAR addr, INT CONST value) :
    IF memory management mode <> data allocation by coder 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate int denoter (addr.value) ;
    put data word (value, addr.value) ;
    addr.kind := global
ENDPROC allocate denoter ; 

PROC allocate denoter (ADDRESS VAR addr, REAL CONST value) :
    IF memory management mode <> data allocation by coder 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate real denoter (addr.value) ;
    addr.kind := global ;
    define (addr, value)
ENDPROC allocate denoter ; 
 
PROC allocate denoter (ADDRESS VAR addr, TEXT CONST value) :
    IF memory management mode <> data allocation by coder 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate text denoter (addr.value, (LENGTH value+1) DIV 2 + 2) ; 
    addr.kind := global ;
    skip heaplink; 
    define (addr, value) ; 
    reset heaplink .
 
skip heaplink : 
    addr.value INCR 1 .

reset heaplink :
    addr.value DECR 1
ENDPROC allocate denoter ; 
 
PROC allocate denoter (ADDRESS VAR addr, DINT CONST value) :
    IF memory management mode <> data allocation by coder 
       THEN errorstop (wrong mm mode) 
    FI ; 
    allocate dint denoter (addr.value, value) ;
    addr.kind := global
ENDPROC allocate denoter ;

PROC allocate dint denoter (INT VAR addr offset, DINT CONST value) :
    adjust to an even address if necessary ;
    put data word (value.low, addr offset) ;
    allocate int denoter (address value) ;
    put data word (value.high, address value) .

adjust to an even address if necessary :
    allocate int denoter (addr offset) ;
    IF (addr offset AND 1) <> 0 THEN allocate int denoter (addr offset) FI
ENDPROC allocate dint denoter ; 

PROC define (ADDRESS CONST addr, INT CONST value) : 
    IF addr.kind <> global 
       THEN errorstop (define on non global) 
    FI ; 
    put data word (value, addr.value) 
ENDPROC define ; 
 
PROC define (ADDRESS CONST addr, DINT CONST value) : 
    IF addr.kind <> global
       THEN errorstop (define on non global) 
    FI ; 
    put data word (value.low , addr.value);
    put data word (value.high, addr.value + 1)
ENDPROC define ;

PROC define (ADDRESS CONST addr, REAL CONST value) : 
    IF addr.kind <> global 
       THEN errorstop (define on non global) 
    FI ; 
    replace (const buffer, 1, value) ; 
    address value := addr.value ;
    FOR index FROM 1 UPTO 4 REP 
        put data word (const buffer ISUB index, address value) ;
        address value INCR 1
    PER 
ENDPROC define ; 
 
PROC define (ADDRESS CONST addr, TEXT CONST value) : 
    IF   addr.kind <> global THEN errorstop (define on non global) 
    ELIF LENGTH value > 255  THEN errorstop (text too long)
    FI ; 
    address value := addr.value ;
    const buffer := code (LENGTH value) ; 
    const buffer CAT value ; 
    const buffer CAT ""0"" ;
    FOR index FROM 1 UPTO LENGTH const buffer DIV 2 REP 
        put data word (const buffer ISUB index, address value) ;
        address value INCR 1
    PER ; 
    const buffer := point line
ENDPROC define ; 
 
PROC allocate var (INT VAR addr, INT CONST length) : 
    EXTERNAL 10033
ENDPROC allocate var ; 
 
PROC allocate int denoter (INT VAR addr) : 
    EXTERNAL 10034
ENDPROC allocate int denoter ;
 
PROC allocate real denoter (INT VAR addr) : 
    EXTERNAL 10035 
ENDPROC allocate real denoter ;

PROC allocate text denoter (INT VAR addr, INT CONST length) : 
    EXTERNAL 10036 
ENDPROC allocate text denoter ;
 
PROC put data word (INT CONST value, INT CONST addr) :
    EXTERNAL 10037
ENDPROC put data word ; 
 
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                 10. Inspector                              28.10.1987  *) 
(*                                                                        *) 
(**************************************************************************) 



INT VAR line number, pattern length, begin of packet,
        last packet entry, indentation;

TEXT VAR bulletin name, type and mode, pattern, buffer, dummy name;
 
DATASPACE VAR bulletin ds :: nilspace ;

.packet name :
     cdb text (cdb int(packet link + wordlength) + two word length) .

.packet entry :
     permanent pointer = 0 OR
     cdbint (permanent pointer) = permanent packet OR
     cdbint (permanent pointer + wordlength) = permanent packet .

.within editor :
    aktueller editor > 0 .  ;

TEXT PROC type name (DTYPE CONST type) : 
    type and mode := "" ; 
    IF CONCR (type) = void id THEN type and mode CAT "VOID"
                              ELSE name of type (CONCR (type)) 
    FI ;
    type and mode
ENDPROC type name ; 
 
TEXT PROC dump (DTYPE CONST type) :
(*  type and mode := "TYPE " ;
    name of type (CONCR (type)) ; 
    type and mode
*)
    type name (type)    (* aus Kompatibilitätsgründen zum 1.9.2 Coder / rr *)
ENDPROC dump ;

PROC name of type (INT CONST type) :
            SELECT type OF
     CASE void id                 :
     CASE int id                  : type and mode CAT "INT"
     CASE real id                 : type and mode CAT "REAL"
     CASE string id               : type and mode CAT "TEXT"
     CASE bool id, bool result id : type and mode CAT "BOOL"
     CASE dataspace id            : type and mode CAT "DATASPACE"
     CASE row id                  : type and mode CAT "ROW "
     CASE struct id               : type and mode CAT "STRUCT"
     OTHERWISE                    : complex type
            ENDSELECT .

complex type :
     unsigned arithmetic ;
     IF type > ptt limit THEN perhaps permanent struct or row
                         ELSE get complex type
     FI .

perhaps permanent struct or row :
     index := type + begin of pt minus ptt limit ;
     mode := cdb int (index) MOD ptt limit ;
     IF   mode = permanent row    THEN get permanent row 
     ELIF mode = permanent struct THEN get permanent struct
                                  ELSE type and mode CAT "-"
     FI .

get complex type :
     index := type + begin of permanent table ;
     IF is complex type THEN get name
                        ELSE type and mode CAT "-"
     FI .

is complex type :
     permanent type definition mode = permanent type .

get name :
     type and mode CAT cdb text (link to type name + two word length) .

link to type name :
     cdb int (index + three word length) .

permanent type definition mode :
     cdb int (index + wordlength) .

get permanent row :
     INT VAR t; 
     type and mode CAT "ROW " ;
     type and mode CAT text (cdb int (index + wordlength)) ;
     type and mode CAT " " ;
     param link := index + two wordlength ;
     get type and mode (t) ;
     name of type (t) .
 
get permanent struct :
     type and mode CAT "STRUCT ( ... )" 
ENDPROC name of type ;

PROC help (TEXT CONST proc name) :
     prep bulletin ;
     prep help ;
     scan (object name) ;
     next symbol (pattern) ;
     packet link := end of permanent table ;
     IF function = 0 THEN standard help
                     ELSE asterisk help
     FI .

prep help :
     object name := compress (proc name) ;
     INT VAR function :: 0 ;
     INT CONST l :: LENGTH object name ;
     IF l > 1 AND object name <> "**"
        THEN IF (object name SUB l) = "*"
               THEN function INCR 2 ;
                    delete char (object name, l)
             FI ;
             IF (object name SUB 1) = "*"
               THEN function INCR 1 ;
                    delete char (object name, 1)
             FI ;
             IF another asterisk THEN wrong function FI
     FI.

another asterisk :
     pos (object name, "*") <> 0 .

wrong function :
     errorstop ("unzulaessige Sternfunktion") .

standard help :
     to object (pattern) ;
     IF found THEN display
              ELSE error stop ("unbekannt: " + proc name)
     FI .

display :
     IF NOT packet entry
        THEN WHILE permanent pointer <> 0 REP
                 put name of packet if necessary ;
                 put specifications (pattern) ;
                 next procedure
             ENDREP ;
             show bulletin file
        FI .
 
put name of packet if necessary :
     IF new packet THEN packet link := permanent pointer ;
                        find begin of packet ;
                        writeline (2) ;
                        write packet name
     FI .

find begin of packet :
     REP 
         packet link DECR wordlength
     UNTIL begin of packet found PER .

begin of packet found :
     cdb int (packet link) = permanent packet .

new packet :
     permanent pointer < packet link .

asterisk help :
     hash table pointer := begin of hash table ;
     pattern length := LENGTH pattern - 1 ;
     REP
        list all objects in current hash table chain ;
        next hash entry
     UNTIL end of hash table reached ENDREP ;
     show bulletin file .

list all objects in current hash table chain :
     nt link := hash table pointer ;
     WHILE yet another nt entry REP
        permanent pointer := cdb int (nt link + wordlength) ;
        object name := cdb text (nt link + two word length) ;
        IF matching THEN into bulletin FI
     PER .

matching :
     INT CONST p :: pos (object name, pattern) ;
     SELECT function OF
         CASE 1 :   p <> 0 AND p = LENGTH object name - pattern length
         CASE 2 :   p = 1
         CASE 3 :   p <> 0
         OTHERWISE  FALSE
     ENDSELECT .

into bulletin :
     object names into bulletin (BOOL PROC not end of chain)
ENDPROC help ;
 
BOOL PROC not end of chain :
     permanent pointer <> 0 
ENDPROC not end of chain ;

PROC write packet name :
     indentation := 0 ;
     write line ;
     write bulletin line ("PACKET ") ;
     indentation := 7 ;
     object name := packet name ;
     write bulletin line (object name) ;
     write bulletin line (":") ;
     writeline (2)
ENDPROC write packet name ;

PROC put specifications (TEXT CONST proc name) :
     put obj name (proc name) ;
     to first param ;
     IF NOT end of params THEN put param list FI ;
     put result ;
     writeline .
  
to first param :
     param link := permanent pointer + word length ;
     set end marker if end of list .

put result :
     INT VAR type;
     get type and mode (type) ;
     IF type <> void id THEN type and mode := "  --> " ;
                             name of type (type) ;
                             write bulletin line (type and mode)
     FI
ENDPROC put specifications ;

PROC put param list : 
     write bulletin line (" (") ;
     REP
         INT VAR type, param mode;
         get type and mode (type) ;
         param mode := mode ;
         put type and mode ;
         maybe param proc ;
         next pt param ;
         IF end of params THEN write bulletin line (")") ;
                               LEAVE put param list 
         FI ;
         write bulletin line (", ") ;
     PER .

put type and mode :
     type and mode := "" ;
     name of type (type) ;
     type and mode CAT name of mode ;
     write bulletin line (type and mode) .

name of mode :
     IF   param mode = const THEN " CONST"
     ELIF param mode = var   THEN " VAR"
                             ELSE " PROC"
     FI .

maybe param proc :
     IF mode = permanent param proc THEN put virtual params FI .

put virtual params :
     skip over result type if complex type ;
     IF NOT end of virtual params THEN put param list FI.

skip over result type if complex type :
     next pt param .

end of virtual params :
    end of params
ENDPROC put param list ;

PROC to packet (TEXT CONST packet name) :
     to object ( packet name) ;
     IF found THEN find start of packet objects FI .

find start of packet objects :
     last packet entry := 0 ;
     packet link := before first pt entry ;
     REP
         packet link INCR wordlength ;
         word := cdb int (packet link) ;
         IF word < 0 THEN IF   word = permanent packet THEN packet found
                          ELIF word = permanent end    THEN return
                          FI
         FI
     ENDREP .

packet found :
     IF cdb int (packet link + wordlength) = nt link
        THEN last packet entry := packet link FI .

return : 
     IF last packet entry <> 0 THEN found := TRUE ;
                                    packet link := last packet entry
                               ELSE found := FALSE
     FI ;
     LEAVE to packet
ENDPROC to packet ;

PROC next packet :
     REP
         packet link INCR wordlength ;
         word := cdb int (packet link) ;
         IF   word = permanent packet THEN true return
         ELIF end of permanents       THEN false return
         FI ;
     ENDREP .

true return :
     found := TRUE ;
     LEAVE next packet .

false return :
     found := FALSE ;
     LEAVE next packet .

end of permanents :
     word = permanent end OR packet link > end of permanent table 
ENDPROC next packet ;

PROC prep bulletin :
     forget (bulletin ds) ;
     bulletin ds := nilspace ;
     bulletin file := sequential file (output, bulletin ds) ;
     line number := 0 ;
     buffer := ""
ENDPROC prep bulletin ;

PROC show bulletin file :
     IF within editor THEN ueberschrift neu FI ;
     DATASPACE VAR local ds :: bulletin ds ;
     FILE VAR local file :: sequential file (modify, local ds) ;
     show (local file) ;
     forget (local ds)
ENDPROC show bulletin file ;

PROC write bulletin line (TEXT CONST line) :
     IF LENGTH buffer + LENGTH line > 75 THEN writeline FI ;
     buffer CAT line
ENDPROC write bulletin line ;

PROC writeline  :
     write (bulletin file, buffer) ;
     line (bulletin file) ;
     line number INCR 1 ;
     cout (line number) ;
     buffer := indentation * " "
ENDPROC writeline ;

PROC writeline (INT CONST times) :
     IF LENGTH compress(buffer) <> 0 THEN index := times - 1 ;
                                          writeline
                                     ELSE index := times
     FI ;
     line (bulletin file, index) ;
     line number INCR index;
     indentation := 0 ;
     cout (line number)
ENDPROC writeline ;
 
PROC bulletin (TEXT CONST packet name) :
     prep bulletin ;
     scan (packet name) ;
     next symbol (pattern) ;
     to packet (pattern) ;
     IF found THEN list packet ;
                   show bulletin file
              ELSE error stop (packet name + " ist kein Paketname")
     FI . 
 
ENDPROC bulletin ;
 
PROC list packet :
     begin of packet := packet link + word length ;
     write packet name ; 
     find end of packet ;
     run through nametab and list all packet objects .
 
find end of packet :
     last packet entry := begin of packet ;
     REP
         last packet entry INCR wordlength ;
         word := cdb int (last packet entry) ;
     UNTIL end of packet entries PER .

end of packet entries :
     word = permanent packet OR word = permanent end .

run through nametab and list all packet objects :
     hashtable pointer := begin of hashtable ;
     REP
         nt link := hashtable pointer ;
         list objects of current packet in this chain ;
         next hash entry
     UNTIL end of hashtable reached ENDREP .

list objects of current packet in this chain :
     WHILE yet another nt entry REP 
         permanent pointer := cdb int (nt link + wordlength) ;
         put objects of this name
     PER .

put objects of this name :
    IF there is an entry THEN into bulletin FI .

there is an entry :
    NOT packet entry AND
    there is at least one object of this name in the current packet .

there is at least one object of this name in the current packet :
     REP
        IF permanent pointer >= begin of packet AND
           permanent pointer < last packet entry
           THEN LEAVE there is at least one object of this name
                      in the current packet WITH TRUE FI ;
        next procedure
     UNTIL permanent pointer = 0 PER ;
     FALSE .

into bulletin :
     object name := cdb text (nt link + two word length) ;
     object names into bulletin (BOOL PROC within packet)
ENDPROC list packet ;

BOOL PROC within packet :
     permanent pointer >= begin of packet AND 
     permanent pointer < last packet entry
ENDPROC within packet ;

PROC object names into bulletin (BOOL PROC link ok) :
     scan (object name) ;
     next symbol (dummy name, mode) ;
     IF type definition THEN put type definition
                        ELSE put object definitions
     FI .

type definition :
     mode = bold AND no params .

no params :
     cdb int (permanent pointer + word length) >= permanent type .

put type definition :
     put obj name (object name) ;
     write bulletin line ("TYPE ") ;
     writeline (1) .

put object definitions :
     WHILE link ok REP
         put specifications (object name) ;
         next procedure
     ENDREP 
ENDPROC object names into bulletin ;
 
PROC bulletin :
     prep bulletin ;
     packet link := first permanent entry ;
     REP
         list packet ;
         write line (4) ;
         next packet
     UNTIL NOT found PER ;
     show bulletin file
ENDPROC bulletin ;

PROC put obj name (TEXT CONST name) :
     buffer := "      " ;
     bulletin name := point line ;
     change (bulletin name, 1, end of line or name, name) ;
     buffer CAT bulletin name ;
     indentation := LENGTH buffer + 1 .

end of line or name :
     min (LENGTH name, LENGTH bulletin name)
ENDPROC put obj name ;

PROC packets :
     prep bulletin ;
     packet link := first permanent entry ;
     REP
         object name := packet name ;
         put obj name (object name) ;
         write line ;
         next packet 
     UNTIL NOT found PER ;
     show bulletin file
ENDPROC packets ;
 
#page#
(**************************************************************************) 
(*                                                                        *) 
(*                 11. ELAN Run-Interface                     04.08.1986  *) 
(*                                                                        *) 
(*   Uebersetzen von ELAN-Programmen                                      *) 
(*   Bereitstellen der Ausgabeprozeduren fuer den ELAN-Compiler           *) 
(*                                                                        *) 
(**************************************************************************) 
 
 
 
BOOL VAR list option     := FALSE ,
         check option    :=  TRUE ,
         warning option  := FALSE , 
         listing enabled := FALSE ;

FILE VAR listing file ;

TEXT VAR listing file name := "" ;
 
 
PROC run (TEXT CONST file name) : 
  enable stop ;
  IF NOT exists (file name)
    THEN errorstop ("""" + file name + """ gibt es nicht")
  FI ;
  last param (file name) ;
  run elan (file name, no ins)
END PROC run;
 
PROC run :
  run (last param)
ENDPROC run ;
 
PROC run again :
  IF run again mod nr <> 0
    THEN elan (run again mode, bulletin file, "", run again mod nr, 
               no ins, no lst, check option, no sermon)
    ELSE errorstop ("'run again' nicht moeglich")
  FI
ENDPROC run again ;
 
PROC insert (TEXT CONST file name) : 
  enable stop ;
  IF NOT exists (file name)
    THEN errorstop ("""" + file name + """ gibt es nicht")
  FI ;
  last param (file name) ;
  run elan (file name, ins)
ENDPROC insert ;
 
PROC insert :
  insert (last param)
ENDPROC insert ;
 
PROC run elan (TEXT CONST file name, BOOL CONST insert option) :
  FILE VAR source := sequential file (modify, file name) ;
  IF listing enabled
    THEN open listing file
  FI ;

  disable stop ;
  no do again ;
  elan (compile file mode, source, "" , run again mod nr,
        insert option, list option, check option, sermon) ;
 
  IF anything noted AND command dialogue
    THEN ignore halt during compiling ;
         note edit (source) ;
         last param (file name) ; 
         errorstop ("")
  FI .

ignore halt during compiling :
  IF is error
    THEN put error ;
         clear error ;
         pause (5)
  FI .

open listing file :
  listing file := sequential file (output, listing file name) ;
  max line length (listing file, 130)

ENDPROC run elan ;
(*
PROC out text (TEXT CONST text, INT CONST out type) :
  INTERNAL 257 ; 
  IF online
    THEN out (text)
  FI ;
  IF out type = error message OR (warning option AND out type = warning message) 
    THEN note (text) ; 
  FI ;
  IF listing enabled
    THEN write (listing file, text)
  FI
ENDPROC out text ;

PROC out line (INT CONST out type) :
  INTERNAL 258 ; 
  IF online
    THEN out (""13""10"")
  FI ;
  IF out type = error message
       OR (warning option AND out type = warning message)
    THEN note line
  ELIF listing enabled
    THEN line (listing file)
  FI
ENDPROC out line ;
*)
PROC prot (TEXT CONST file name) :
  list option := TRUE ;
  listing file name := file name ;
  listing enabled := TRUE
ENDPROC prot ;
 
PROC prot off :
  list option := FALSE ;
  listing enabled := FALSE
ENDPROC prot off ;

BOOL PROC prot :
  list option
ENDPROC prot ;
 
PROC check on :
  check option := TRUE
ENDPROC check on ;
 
PROC check off :
  check option := FALSE
ENDPROC check off ;
 
BOOL PROC check :
  check option
ENDPROC check ;

PROC warnings on :                    
  warning option := TRUE    
ENDPROC warnings on ;    
 
PROC warnings off : 
  warning option := FALSE 
ENDPROC warnings off ; 
 
BOOL PROC warnings : 
  warning option 
ENDPROC warnings ; 

ENDPACKET eumel coder ;  

PACKET dint2 DEFINES dint type :
 
INT VAR dummy ;
DTYPE VAR d ;
identify ("DINT", dummy, dummy, d) ; 
 
DTYPE CONST dint type := d

ENDPACKET dint2 ;