\ quit.v4 -- a line of text, interpreted; how it ends; and the words that \ print text written in the source. \ \ DECOMPOSITION.md 5.15 and 5.10: QUIT ABORT ABORT" (ABORT") ." (."). Part of \ the compiler capsule. Rests on all the files before it. \ \ A NODE IS SENT TEXT (docs/v4.0.0/MESH.md section 6). It does not read its \ own command line and prints no prompt. A node with nothing to do sleeps; \ a message comes to one of its wires; if that is text for this node it is \ taken and interpreted; what it printed goes back as a message, and then \ a message saying how the text ended: \ 1 it completed a console says " ok" \ 2 it ended in an error the message is already printed; " ERROR" \ 0 QUIT nothing is said \ What a console then shows is v3's: \ ok> 65 EMIT the console's prompt, and the line \ A ok what the line printed, then " ok" \ ok> NOSUCH \ UNKNOWN WORD: 'NOSUCH' \ ERROR \ ok> -1 @ \ Address out of range an address fault (D-14), from any depth \ ERROR \ KEY, EXPECT and QUERY are FORTH-79 words that read characters, as before; \ they are not how text reaches the node. They still read the console's \ registers, CONSOLE-RX and CONSOLE-STATUS, and not a message. \ \ THE STACKS are guarded (D-16): each counts what it holds, and a push onto \ a full one or a pop from an empty one is a fault. So QUIT and ABORT, which \ never return to whatever ran them, must empty the return stack, and ABORT \ the data stack too. A store to RSTACK-DEPTH or DSTACK-DEPTH does that. \ \ Constants the loader supplies: \ (LINE-STATUS) word address of the variable: how the last text ended \ (MSG) (REPLY) (ME) (OUT) (OUT^) see core.v4, "what a node prints" \ (PORT) word address of the node's port 0 \ (Q) word address of four cells of scratch, which system.v4 and \ blocks.v4 use too \ DSTACK-DEPTH RSTACK-DEPTH word addresses of the stack registers \ ( -- ) empty the return stack. `a` is only something to store: any \ store to the register empties the stack, and `a` needs nothing to be on \ the data stack. One cell of the data stack is used for a moment. macro R-CLEAR RSTACK-DEPTH b! a !b endmacro \ ( -- ) stop compiling; forget the word being built and any open control \ structures. A definition that was under way stays hidden. : (RESET) 0 STATE a! ! (CG-RESET) CFBASE (CFP) a! ! ; \ ( s -- ) the text is done with. What it printed is sent, then a message \ saying how it ended -- 0 QUIT, 1 completed, 2 an error -- and the node waits \ for the next. (DONE) is entered with the same number and, for an error, \ stops compiling first; it is always jumped to, never called, by \ something that has emptied the return stack (or by a fault, which empties \ it). (LINE-STATUS) keeps how the last text ended, and is the one word of \ the message's text. \ THE ANSWER IS NOT REFUSED HERE: the text was not begun until the wire it \ goes by had room for it, and that room has been kept, (KEEP), which is \ let go only now (MESH.md 7d.4). If no one is on that port any more it \ is counted in (LOST). \ FOUR CELLS OF THE DATA STACK are tried first: what a node does between \ texts -- this, passing messages on, taking the next text in -- and the \ interpreter need that many, so text may leave 28 values on a stack of 32 \ and no more. Text that leaves more ends here, "Stack overflow", with \ the stack emptied, and not later, in the middle of the text after it. : (FINISH) ( s -- ) 1 (QUIET) a! ! \ from here nothing is this text's doing (LINE-STATUS) b! !b 0 0 0 0 drop drop drop drop (FLUSH-OUT) -1 (KEEP) a! ! (MSG)+1 a! @ 3 (HDR) 4 (OUT-HDR)+6 a! ! \ to whoever sent the text: type 3, four characters (LINE-STATUS) (DONE-PORT) a! @ (PUT-ON) if SENT drop (LOST) a! @ 1 + ! jump (IDLE) SENT: drop jump (IDLE) : (DONE) if GO -1 + if OK drop (RESET) 2 jump (FINISH) OK: drop 1 jump (FINISH) GO: drop 0 jump (FINISH) \ ( -- flag ) A GONE has been taken: its seven words are in (IN), the \ node it is about in (ONE), and (S-WIRE) is the wire it came by. It is \ believed only if it came by the port that leads to this node's centre \ and says it is from the centre (MESH.md 7b.4): the way to the node is \ then forgotten, and the flag is -1. Otherwise nothing is done, and 0. \ (As first built only what it said it was from was looked at, and one \ that came by another port was believed.) : (GONE?) (CENTRE) if NOT (IN)+1 a! @ xor if FROM drop 0 ; NOT: ; FROM: drop (ROUTE-DEFAULT) a! @ (PORT) - (S-WIRE) a! @ xor if YES drop 0 ; YES: drop (ONE) a! @ NO-ROUTE -1 ; \ ( -- ) WAITING (MESH.md 7d.4). A node with nothing to do passes on \ what has come for other nodes, (SERVE), and then goes through what has \ come for itself, the lowest port first and each wire from its front: \ text is taken, into TIB, and done: (LINE), and then (FINISH) says \ how it ended. But not unless the wire its answer goes by -- \ the way to whoever sent it; with none known, or no one on \ that port, the wire it came on -- has room for the answer, \ 8 cells. If it has not, the text stays on its wire and the \ node looks further: there may be several such, on wires \ whose answers go different ways, and each is begun when \ its own has the room. That room is kept from then until \ the answer has gone. \ TEXTS WHOSE ANSWERS GO THE SAME WAY ARE BEGUN IN THE ORDER \ THEY CAME. Once one has been left for want of room, every \ text behind it on this pass whose answer goes by that port \ is left too, though the room has come since: (D-MASK) has \ a bit for each such port. (As first built only the room \ was asked, each time; room that came between the look at \ one text and at the next began the second first. Found \ by the final review of step 6e.) \ a NACK is taken and counted in (REFUSED) \ a GONE is taken, and believed if this node's centre sent it \ an answer no one is waiting for is dropped: a SEND that is not waited \ on is ordinary use, and its answer is not a loss. \ any other is dropped, and counted in (LOST): what a node printed \ that came here, a type there is none of, or a NACK or GONE \ that is not as long as one is. (LOST) counts what should \ have been delivered or acted on and was not. \ A TAKE THAT DOES NOT TAKE -- the wire was cut after the message was \ looked at -- leaves nothing to act on: no text is done and nothing is \ believed for it, (UNTAKEN). The same for a drop that does not drop. \ With nothing to begin it sleeps, executing nothing, until a message \ comes; or, if text is waiting for room for its answer, or (SERVE) left a \ message for want of room, until there is room on any wire that leads \ from it or a message comes. Then it does all of this again. \ It has fetched which wires have a message before it looks at any, and \ sleeps after: a message that comes while it looks wakes it at once, and \ one it left on a wire does not keep it awake (MESH.md 7d.3). \ (KEEP) and (AWAIT-FROM) are put back here every time: whatever was \ abandoned on the way, a node with nothing to do keeps no room and waits \ for no one. : (IDLE) L: 1 (QUIET) a! ! \ nothing here is any text's doing: see (RAISED) -1 (KEEP) a! ! 0 (AWAIT-FROM) a! ! -1 (DEFER) a! ! 0 (D-MASK) a! ! (SERVE) (MINE0) M: (MINE) if REST drop (IN)+2 a! @ -1 + if TEXT -3 + if NACK -1 + if GONE OTHER: drop 4 (DO) if LETGO drop (SKIP) jump M \ it was not there to drop: nothing is counted LETGO: drop (IN)+2 a! @ -3 + if ANSWER \ let go. An answer no one waits for is ordinary: drop (LOST) a! @ 1 + ! jump M \ anything else should not have come here, and is counted ANSWER: drop jump M NACK: drop (IN)+6 a! @ -4 + if N1 jump OTHER N1: drop (TAKE1) if N2 drop (UNTAKEN) jump M \ not taken: nothing is done for it N2: drop (REFUSED) a! @ 1 + ! jump M \ a message of this node's was refused: counted GONE: drop (IN)+6 a! @ -4 + if G1 jump OTHER G1: drop (TAKE1) if G2 drop (UNTAKEN) jump M G2: drop (GONE?) drop jump M TEXT: drop (IN)+1 a! @ (WAY) -if T1 drop (S-WIRE) a! @ \ the way back; with none known, the wire it came on T1: (DONE-PORT) a! ! (DONE-PORT) a! @ (WBIT) (D-MASK) a! @ and if FREE1 jump FULL \ text ahead of it waits for room on that wire FREE1: drop 8 (DONE-PORT) a! @ (ROOM?) if START -1 + if FULL drop (S-WIRE) a! @ (DONE-PORT) a! ! \ no one is on that port: back by the wire it came on, (S-WIRE) a! @ (WBIT) (D-MASK) a! @ and if FREE2 jump FULL FREE2: drop 8 (S-WIRE) a! @ (ROOM?) -1 + if FULL jump START \ if that has the room -- or has no one on it either FULL: drop (DONE-PORT) a! @ (WBIT) dup inv (D-MASK) a! @ and + ! (DEFER) a! @ -if LATER drop (DONE-PORT) a! @ (DEFER) a! ! (SKIP) jump M LATER: drop (SKIP) jump M REST: drop (DEFER) a! @ -if ROOM drop (SLEEP) jump L ROOM: (WIRE!) 8 (WIRE-A) b! !b 9 (DO) drop jump L START: drop (S-WIRE) a! @ dup (REPLY) a! ! (WIRE!) (MSG) (WIRE-A) b! !b TIB 2/ 2/ (WIRE-B) b! !b 2 (DO) \ its seven words, and its text if TAKEN drop (UNTAKEN) jump M \ not taken: the wire was cut since it was looked at TAKEN: drop 0 (MSG)+6 a! @ TIB + C! \ a zero after the text (MSG)+6 a! @ SPAN a! ! (DONE-PORT) a! @ (KEEP) a! ! \ the room for its answer is kept from here (CONSOLE) a! @ if P0 jump P1 \ where what it prints goes: the console, P0: drop (MSG)+1 a! @ \ or whoever sent it; P1: dup (PRINT-TO) a! ! (WAY) -if Q1 drop (REPLY) a! @ \ by the way there, or the wire the text came on Q1: (PRINT-PORT) a! ! jump (LINE) \ ( -- ) THE TEXT, INTERPRETED. It is in TIB with a zero after it and its \ length in SPAN, and the return stack is empty. It is interpreted with one \ return entry under it, this word's call of INTERPRET; whatever is on the \ data stack stays there. : (LINE) 0 (QUIET) a! ! \ an error from here on is this text's 0 BLK a! ! \ the terminal, whatever was being loaded TIB (SRC) a! ! 0 >IN a! ! 0 NODE-ERROR b! !b INTERPRET NODE-ERROR b! @b if GOOD drop 2 jump (DONE) GOOD: drop 1 jump (DONE) \ ---- the node among others (MESH.md sections 6 and 7) --------------------------- \ Not FORTH-79 and not in v3: v3's VMs are sent to through the kernel. \ ( node port -- ) the port, by its number, leads toward that node header ROUTE : ROUTE (ROUTE#) a! @ -16 + if FULL drop (PORT) + (ROUTE#) a! @ 2* (ROUTES) + a! push !+ pop !+ (ROUTE#) a! @ 1 + ! ; FULL: drop drop drop NODE-ERROR b! 12 !b ; \ ( node port -- ) the node on the other end of the port, by its number; \ 0: none, or a device. Whoever wires the node tells it, and tells it again \ when the wiring changes. It is how a node knows who its centre is, the \ one node whose GONE it believes: (CENTRE). header NEIGHBOUR : NEIGHBOUR dup -if POS jump BAD POS: -PORTS + -if BAD drop (NEAR) + a! ! ; BAD: drop drop drop NODE-ERROR b! 12 !b ; \ ( port -- ) the port, by its number, leads toward every node not told of header DEFAULT-ROUTE : DEFAULT-ROUTE (PORT) + (ROUTE-DEFAULT) a! ! ; \ ( node -- ) forget the way to that node, if one is known: what is for it \ then goes by the way for every node not told of, if there is one. The \ last way in the table takes its place. header NO-ROUTE : NO-ROUTE (ROUTE#) a! @ if NONE -1 + (ROUTES) a! FOR dup @+ xor if HIT drop @+ drop NEXT drop ; NONE: drop drop ; HIT: drop drop pop drop a -1 + push \ where its entry is (ROUTE#) a! @ -1 + dup ! \ one way fewer 2* (ROUTES) + a! @+ @ \ the last entry: node port pop a! SWAP !+ ! ; \ ( about node type -- ) send the node a message of one word, `about`: \ a GONE is type 5 (MESH.md 7b). With no way to the node it is error 12. \ It goes or is refused at once; refused -- no one on the port, or no room \ on the wire -- it is counted in (LOST) (MESH.md 7d.4). : (SEND1) push dup (WAY) -if GO drop drop drop pop drop NODE-ERROR b! 12 !b ; GO: (W-PORT) a! ! SWAP (ONE) a! ! pop (HDR) 4 (OUT-HDR)+6 a! ! (ONE) (W-PORT) a! @ (PUT-ON) if SENT drop (LOST) a! @ 1 + ! ; SENT: drop ; \ ( n node -- ) tell the node that node n is gone. It acts on that only \ if this node is its centre: it forgets the way to n, and if it is waiting \ for n's answer the wait ends. header GONE : GONE 5 jump (SEND1) \ ( -- ) forget every way: for when the wiring has changed header NO-ROUTES : NO-ROUTES 0 (ROUTE#) a! ! 0 (ROUTE-DEFAULT) a! ! ; \ ( baddr u node port -- ) send the node u characters of text to \ interpret, by the port given, by its number. The text is made ready in \ (SEND-TEXT), four characters to a word, the message is put on the wire \ whole, and it is on its way when this returns. IT GOES OR IS REFUSED AT \ ONCE (MESH.md 7d.1, ruling 3): with no room on the wire it is counted in \ (REFUSED), as a refusal that came back would be, and is error 19, Message \ refused; with no one on the port, error 18. Nothing is on a \ wire until the put, the last thing done. More characters than a message \ carries, or fewer than none, is error 12. What lies after the text in \ this node's memory does not go with it: the last word is made zero past \ the last character. : (SEND-ON) push 1 (HDR) -if POS BAD: drop drop pop drop NODE-ERROR b! 12 !b ; LONG: drop jump BAD POS: dup -1025 + -if LONG drop dup (OUT-HDR)+6 a! ! (SEND-TEXT) (SEND^) a! ! 3 + 2/ 2/ if NONE -1 + FOR dup C@ over 1 + C@ 8* + over 2 + C@ 8* 8* + over 3 + C@ 8* 8* 8* + (SEND^) b! @b a! !+ a !b 4 + NEXT drop (OUT-HDR)+6 a! @ 3 and if PUT \ the last word: nothing in it past the last character (SEND^) b! @b -1 + a! -1 + if M1 -1 + if M2 drop @ 16777215 and ! jump PUT0 M2: drop @ 65535 and ! jump PUT0 M1: drop @ 255 and ! jump PUT0 NONE: drop PUT: drop PUT0: (SEND-TEXT) pop (PUT-ON) if SENT -1 + if FULL drop NODE-ERROR b! 18 !b ; FULL: drop (REFUSED) a! @ 1 + ! NODE-ERROR b! 19 !b ; SENT: drop ; \ ( baddr u node -- ) send the node u characters of text to interpret, \ by the way this node knows to it. What it prints there goes to that \ node's console. With no way to the node it is error 12. header SEND : SEND dup (WAY) -if GO drop drop drop drop NODE-ERROR b! 12 !b ; GO: jump (SEND-ON) \ ( baddr u node port -- ) the same by a port this node names, by its \ number, whatever ways it knows: for a neighbour that has no number of \ its own yet, to which text is sent as to node 0. header SEND-ON : SEND-ON dup -if POS jump BAD POS: -PORTS + -if BAD drop jump (SEND-ON) BAD: drop drop drop drop drop NODE-ERROR b! 12 !b ; \ ( -- n ) the number of this node's centre: the node on the port that \ leads to everything it has no other way to. 0: it has none, or has not \ been told who is there (NEIGHBOUR). : (CENTRE) (ROUTE-DEFAULT) a! @ if NONE (PORT) - (NEAR) + a! @ ; NONE: ; \ ( -- n ) the number of this node's console: the one it was told of, or \ with none told of, whoever sent the text it is doing : (A-CONSOLE) (CONSOLE) a! @ if C0 ; C0: drop (MSG)+1 a! @ ; \ ( what -- how | ) the wait is over: 1 the answer has come, and its \ word, in (ONE), is left; 2 refused, error 19; 3 the node is gone, error \ 20; 4 a line from the console, error 21 : (A-END) 0 (AWAIT-FROM) a! ! -1 + if ANS -1 + if REF -1 + if LEFT drop NODE-ERROR b! 21 !b ; ANS: drop (ONE) a! @ ; REF: drop NODE-ERROR b! 19 !b ; LEFT: drop NODE-ERROR b! 20 !b ; \ ( node -- how ) WAIT FOR THE NODE'S WORD OF HOW TEXT ENDED: 0 QUIT, \ 1 completed, 2 an error. (AWAIT-FROM) holds the node while this node \ waits, and 0 otherwise. It sleeps, executing nothing, until a message \ comes; then it passes on what is for other nodes, (SERVE), and goes \ through what is for itself (MESH.md 7d.4): \ the answer -- a message of type 3 from that node -- is taken, and the \ wait is over; \ a NACK is taken: about that node, the wait ends in error 19, Message \ refused; about another it is counted, as at any time; \ a GONE is taken: believed (its centre sent it: (GONE?)) and about that \ node, the wait ends in error 20, Node gone; \ text from its console ends the wait in error 21, Interrupted (7b.6). \ The text is not taken: it stays on its wire and is done when this \ text has been finished with. It is the one way to end a wait on \ a node that is alive and never answers, short of Hera's killing \ that node; \ anything else stays on its wire, in its order, for when this node has \ nothing to do. \ WHAT HAS COME ALREADY is on the wires and is found the first time \ through: the node looks before it sleeps. A message it left on a wire \ does not keep it awake. \ The stack what it does needs is tried first, (ROOM), core.v4: text that \ has left too little ends "Stack overflow" with nothing taken off a wire. header AWAIT : AWAIT (ONE) a! ! (ROOM) \ if this faults, no one is waited for: (ONE) a! @ (AWAIT-FROM) a! ! 0 (A-SELF) a! ! \ (AWAIT-FROM) is set only when the stack has been tried L: (SERVE) (A-SELF) a! @ if SCAN drop 2 jump (A-END) \ this node's own message for that node came back to it SCAN: drop (MINE0) M: (MINE) if SLEEP drop (IN)+2 a! @ -1 + if TEXT -2 + if ANSWER -1 + if NACK -1 + if GONE KEEP: drop (SKIP) jump M TEXT: drop (A-CONSOLE) (IN)+1 a! @ xor if BREAK jump KEEP \ text: from the console? BREAK: drop 4 jump (A-END) ANSWER: drop (IN)+1 a! @ (AWAIT-FROM) a! @ xor if A1 jump KEEP A1: drop (IN)+6 a! @ -4 + if A2 jump KEEP A2: drop (TAKE1) if A3 drop (UNTAKEN) jump M \ not taken: nothing is done for it A3: drop 1 jump (A-END) NACK: drop (IN)+6 a! @ -4 + if N1 jump KEEP N1: drop (TAKE1) if N0 drop (UNTAKEN) jump M N0: drop (ONE) a! @ (AWAIT-FROM) a! @ xor if N2 \ about the node waited for? drop (REFUSED) a! @ 1 + ! jump M \ another: counted N2: drop 2 jump (A-END) GONE: drop (IN)+6 a! @ -4 + if G1 jump KEEP G1: drop (TAKE1) if G0 drop (UNTAKEN) jump M G0: drop (GONE?) if M0 \ only its centre is believed drop (ONE) a! @ (AWAIT-FROM) a! @ xor if G2 drop jump M G2: drop 3 jump (A-END) M0: drop jump M SLEEP: drop (SLEEP) jump L \ ( w port -- ) write a cell to the port, by its number. It waits until \ the neighbour has taken it. This is how a node is sent a capsule of F18 \ code (docs/v4.0.0/MESH.md section 5): the cells go as they are, not as a \ message, to a node that is executing from its ports. header PORT! : PORT! dup -if POS jump BAD POS: -PORTS + -if BAD drop (PORT) + b! !b ; BAD: drop drop drop NODE-ERROR b! 12 !b ; \ ( -- ) WHAT IS IN THE DICTIONARY NOW IS THE SYSTEM: COLD comes back to \ it and FORGET will not go below it. Whoever has loaded a node's capsules \ has it do this (system.v4, (BOOT) and FENCE). header (SEAL) : (SEAL) DP a! @ (BOOT) a! ! (LATEST) a! @ (BOOT)+1 a! ! DP a! @ 3 + 2/ 2/ FENCE a! ! ; \ FORTH-79: clear the return stack, set execution mode, return control to \ the terminal; no message is given. The data stack is left as it is. \ NODE-ERROR, by name: how a definition written in FORTH raises an error. \ A store of a code that is not zero is the trap of D-18 -- the word goes no \ further, the message for the code is printed (-1: the word has printed \ its own) and the line ends with ERROR. The codes are listed in core.v4. header NODE-ERROR inline : NODE-ERROR' NODE-ERROR ; header (ME) inline : (ME)' (ME) ; header (CONSOLE) inline : (CONSOLE)' (CONSOLE) ; header (LOST) inline : (LOST)' (LOST) ; header (REFUSED) inline : (REFUSED)' (REFUSED) ; header (WORD-DEFINED) inline : (WORD-DEFINED)' (WORD-DEFINED) ; header (WORD-FORGOTTEN) inline : (WORD-FORGOTTEN)' (WORD-FORGOTTEN) ; header QUIT : QUIT R-CLEAR (RESET) CR 0 jump (DONE) \ FORTH-79: clear the data and return stacks, set execution mode, return \ control to the terminal. As v3, the line it stops ends with " ok". \ Both are emptied before anything is called: ABORT may be run with the \ return stack full. header ABORT : ABORT R-CLEAR DSTACK-DEPTH b! a !b (RESET) 1 jump (DONE) \ ---- faults (D-14, D-16) ------------------------------------------------------- \ Where the node goes when a programme uses an address outside its memory, \ pushes onto a full stack or pops an empty one. The opcode that faulted did \ nothing, and both stacks have been emptied. Each handler says what happened; \ whatever was running is abandoned, as by ABORT, and the line ends with \ ERROR. : (FAULT) \ "Address out of range" $72646441 (EMIT4) $20737365 (EMIT4) $2074756F (EMIT4) $7220666F (EMIT4) $65676E61 (EMIT4) CR 2 jump (DONE) : (D-OVER) \ "Stack overflow" $63617453 (EMIT4) $766F206B (EMIT4) $6C667265 (EMIT4) $776F (EMIT4) CR 2 jump (DONE) : (D-UNDER) \ "Stack underflow" $63617453 (EMIT4) $6E75206B (EMIT4) $66726564 (EMIT4) $776F6C (EMIT4) CR 2 jump (DONE) : (R-OVER) \ "Return stack overflow" $75746552 (EMIT4) $73206E72 (EMIT4) $6B636174 (EMIT4) $65766F20 (EMIT4) $6F6C6672 (EMIT4) $77 (EMIT4) CR 2 jump (DONE) : (R-UNDER) \ "Return stack underflow" $75746552 (EMIT4) $73206E72 (EMIT4) $6B636174 (EMIT4) $646E7520 (EMIT4) $6C667265 (EMIT4) $776F (EMIT4) CR 2 jump (DONE) \ A word has stored an error code in NODE-ERROR (D-18; the codes are listed \ in core.v4). Print its message -- a negative code means the word printed \ its own -- and end the line with ERROR. The return stack has been \ emptied; the data stack is as the word left it. \ (QUIET) is 1 while the node is doing something that is no text's doing: \ passing a message on, or sending what a text printed and word of how it \ ended. An error then has nobody to be told to, and telling it would \ begin another message for a text that is over. Nothing the nucleus does \ there raises one as it stands -- with no one on a port it counts what it \ could not send, and goes on -- so this is a guard: if one is raised, what \ was being sent is let go and counted, and the node goes back to waiting. : (RAISED) (QUIET) a! @ if SPEAK drop (OUT) (OUT^) a! ! (LOST) a! @ 1 + ! jump (IDLE) SPEAK: drop NODE-ERROR b! @b -if POS drop 2 jump (DONE) POS: -1 + if M1 -1 + if M2 -1 + if M3 -1 + if M4 -1 + if M5 -1 + if M6 -1 + if M7 -1 + if M8 -1 + if M9 -1 + if M10 -1 + if M11 -1 + if M12 -1 + if M13 -1 + if M14 -1 + if M15 -1 + if M16 -1 + if M17 -1 + if M18 -1 + if M19 -1 + if M20 -1 + if M21 drop 2 jump (DONE) M1: drop $6167654E (EMIT4) $65766974 (EMIT4) $756F6320 (EMIT4) $746E (EMIT4) CR 2 jump (DONE) M2: drop $20746F4E (EMIT4) $756E2061 (EMIT4) $7265626D (EMIT4) CR 2 jump (DONE) M3: drop $626D754E (EMIT4) $74207265 (EMIT4) $6C206F6F (EMIT4) $676E6F (EMIT4) CR 2 jump (DONE) M4: drop $20746F4E (EMIT4) $68632061 (EMIT4) $63617261 (EMIT4) $726574 (EMIT4) CR 2 jump (DONE) M5: drop $74636944 (EMIT4) $616E6F69 (EMIT4) $66207972 (EMIT4) $6C6C75 (EMIT4) CR 2 jump (DONE) M6: drop $656D614E (EMIT4) $73696D20 (EMIT4) $676E6973 (EMIT4) CR 2 jump (DONE) M7: drop $746E6F43 (EMIT4) $206C6F72 (EMIT4) $75727473 (EMIT4) $72757463 (EMIT4) $696D2065 (EMIT4) $74616D73 (EMIT4) $6863 (EMIT4) CR 2 jump (DONE) M8: drop $746E6F43 (EMIT4) $206C6F72 (EMIT4) $75727473 (EMIT4) $72757463 (EMIT4) $74207365 (EMIT4) $64206F6F (EMIT4) $706565 (EMIT4) CR 2 jump (DONE) M9: drop $66696853 (EMIT4) $6F632074 (EMIT4) $20746E75 (EMIT4) $2074756F (EMIT4) $7220666F (EMIT4) $65676E61 (EMIT4) CR 2 jump (DONE) M10: drop $746F7250 (EMIT4) $65746365 (EMIT4) $6F772064 (EMIT4) $6472 (EMIT4) CR 2 jump (DONE) M11: drop $69766944 (EMIT4) $6E6F6973 (EMIT4) $20796220 (EMIT4) $6F72657A (EMIT4) CR 2 jump (DONE) M12: drop $75677241 (EMIT4) $746E656D (EMIT4) $74756F20 (EMIT4) $20666F20 (EMIT4) $676E6172 (EMIT4) $65 (EMIT4) CR 2 jump (DONE) M13: drop $636F6C42 (EMIT4) $756F206B (EMIT4) $666F2074 (EMIT4) $6E617220 (EMIT4) $6567 (EMIT4) CR 2 jump (DONE) M14: drop $62206F4E (EMIT4) $6B636F6C (EMIT4) $20736920 (EMIT4) $6E696562 (EMIT4) $6F6C2067 (EMIT4) $64656461 (EMIT4) CR 2 jump (DONE) M15: drop $65666544 (EMIT4) $64657272 (EMIT4) $726F7720 (EMIT4) $6F6E2064 (EMIT4) $65732074 (EMIT4) $74 (EMIT4) CR 2 jump (DONE) M16: drop $20746F4E (EMIT4) $6F772061 (EMIT4) $6472 (EMIT4) CR 2 jump (DONE) M17: drop $726F7453 (EMIT4) $20656761 (EMIT4) $75666572 (EMIT4) $646573 (EMIT4) CR 2 jump (DONE) M18: drop (OUT) (OUT^) a! ! \ what was printed and not sent cannot be sent: it is let go $6F206F4E (EMIT4) $6F20656E (EMIT4) $6874206E (EMIT4) $70207461 (EMIT4) $74726F (EMIT4) CR 2 jump (DONE) M19: drop $7373654D (EMIT4) $20656761 (EMIT4) $75666572 (EMIT4) $646573 (EMIT4) CR 2 jump (DONE) M20: drop $65646F4E (EMIT4) $6E6F6720 (EMIT4) $65 (EMIT4) CR 2 jump (DONE) M21: drop $65746E49 (EMIT4) $70757272 (EMIT4) $646574 (EMIT4) CR 2 jump (DONE) \ The table the loader gives the node: six words, one for each kind of \ fault in the node's order, each a jump. A jump fills its word, so they \ are one after another. : (FAULTS) jump (FAULT) jump (D-OVER) jump (D-UNDER) jump (R-OVER) jump (R-UNDER) jump (RAISED) \ ---- text in the source --------------------------------------------------------- \ The three run-time words have names, as v3's have, so that SEE can tell a \ string in a definition from code; they cannot be used from the prompt. \ ." and ABORT" take the text up to the next " , which may be none at all \ (input.v4's (PARSE)); with no closing " it is the rest of the line. Inside a definition they lay \ down a call to their run-time word and, after it, the text as a counted \ string: the count byte and the characters, four to a cell, the last cell \ filled with zeros. The run-time word finds the string by the return \ address the call left, and returns to the cell after the string. \ ( -- ) lay the counted string in WBUF into the dictionary, as above. \ (Q)+0 how many bytes are still to go, (Q)+1 which is next. : (STRING,) (FLUSH) WBUF C@ 1 + (Q) a! ! 0 (Q)+1 a! ! L: (Q) a! @ if DONE -1 + ! (Q)+1 a! @ dup 1 + ! WBUF + C@ C, jump L DONE: drop P: DP b! @b 3 and if ALIGNED drop 0 C, jump P ALIGNED: drop ; \ The run time of ." : print the string after the call, go on after it. \ It takes the return address off before it calls anything and keeps the \ count there instead, so a word that prints text goes no deeper than one \ that calls any other word. header (.") compile-only : (.") pop 4* dup C@ \ baddr n L: if DONE push 1 + dup C@ EMIT pop -1 + jump L DONE: drop 4/ 1 + push ; \ the cell after the last character \ FORTH-79: ." text" prints the text -- now, if interpreting; when the word \ it is compiled into runs, if compiling. header ." immediate : DOT-QUOTE 34 (PARSE) drop STATE a! @ if NOW drop &(.") (CALL,) jump (STRING,) NOW: drop WBUF COUNT jump TYPE \ ( flag -- ) the run time of ABORT" : if the flag is not zero print the \ string after the call, start a new line and ABORT; otherwise go on after \ the string. header (ABORT") compile-only : (ABORT") if NO drop pop 4* R-CLEAR COUNT TYPE CR jump ABORT NO: drop pop 4* dup C@ + 4/ 1 + push ; \ ( flag -- ) ABORT" text" as v3 (it is FORTH-83's, not FORTH-79's): if \ the flag is not zero, print the text and ABORT. header ABORT" immediate : ABORT-QUOTE 34 (PARSE) drop STATE a! @ if NOW drop &(ABORT") (CALL,) jump (STRING,) NOW: drop if NO drop WBUF COUNT TYPE CR jump ABORT NO: drop ; \ The run time of S" : leave the address and length of the string after the \ call, and go on after it. header (S") compile-only : (S") pop 4* dup C@ \ baddr n over over + 4/ 1 + push \ the cell after the last character push 1 + pop ; \ baddr+1 n \ ( -- baddr u ) S" text" as v3. In a definition the text is compiled \ into it. At the prompt it is copied to PAD, where it stays until PAD is \ used again: WORD's buffer is overwritten by the very next word of the line. header S" immediate : S-QUOTE 34 (PARSE) drop STATE a! @ if NOW drop &(S") (CALL,) jump (STRING,) NOW: drop WBUF+1 PAD WBUF C@ CMOVE PAD WBUF jump C@