adding things
This commit is contained in:
Brad Nelson
1
.gitignore
vendored
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1
.gitignore
vendored
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forth
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Makefile
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Makefile
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forth: forth.c
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CFLAGS=-Wall -Werror
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clean:
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rm -f forth
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206
forth.c
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206
forth.c
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define HEAP_SIZE (1024 * 1024)
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#define STACK_SIZE (1024 * 1024)
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typedef intptr_t cell_t;
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#if __SIZEOF_POINTER__ == 8
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typedef __int128_t dcell_t;
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# define CELL_BITS 3
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#elif __SIZEOF_POINTER__ == 4
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typedef int64_t dcell_t;
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# define CELL_BITS 2
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#else
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# error "unsupported cell size"
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#endif
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#define DUP *++sp = tos
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#define DROP tos = *sp--
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#define NEXT w = *ip++; goto *(void **) w
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#define OPCODE_LIST \
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X("0=", OP_ZEQUAL, tos = !tos) \
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X("0<", OP_ZLESS, tos = tos < 0) \
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X("+", OP_PLUS, tos += *sp--) \
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X("*/MOD", OP_SSMOD, d = (dcell_t) tos; \
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m = (dcell_t) *sp; \
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n = (dcell_t) sp[-1]; \
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n *= m; \
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tos = (cell_t) (n / d); \
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*--sp = (cell_t) (n % d)) \
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X("AND", OP_AND, tos &= *sp--) \
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X("OR", OP_OR, tos |= *sp--) \
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X("XOR", OP_XOR, tos ^= *sp--) \
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X("DUP", OP_DUP, DUP) \
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X("SWAP", OP_SWAP, t = tos; tos = *sp; *sp = t) \
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X("OVER", OP_OVER, DUP; tos = sp[-1]) \
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X("DROP", OP_DROP, DROP) \
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X("SP@", OP_SPAT, DUP; tos = (cell_t) sp) \
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X("SP!", OP_SPSTORE, sp = (cell_t *) tos; DROP) \
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X("RP@", OP_RPAT, DUP; tos = (cell_t) rp) \
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X("RP!", OP_RPSTORE, rp = (cell_t *) tos; DROP) \
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X(">R", OP_TOR, *++rp = tos; DROP) \
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X("R>", OP_FROMR, DUP; tos = *rp--) \
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X("R@", OP_RAT, DUP; tos = *rp) \
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X("CELL", OP_CELL, DUP; tos = sizeof(cell_t)) \
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X("@", OP_AT, tos = *(cell_t *) tos) \
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X("C@", OP_CAT, tos = *(uint8_t *) tos) \
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X("!", OP_STORE, *(cell_t *) tos = *sp; --sp; DROP) \
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X("C!", OP_CSTORE, *(uint8_t *) tos = *sp; --sp; DROP) \
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X("BRANCH", OP_BRANCH, ip = (cell_t *) *ip) \
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X("0BRANCH", OP_ZBRANCH, if (!tos) ip = (cell_t *) *ip; else ++ip; DROP) \
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X("DOLIT", OP_DOLIT, DUP; tos = *(cell_t *) ip++) \
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X("FIND", OP_FIND, tos = find(last, (cell_t *) *sp, tos, sp)) \
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X("PARSE", OP_PARSE, DUP; tos = parse(tib, ntib, &tin, tos, sp)) \
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X("CREATE", OP_CREATE, t = parse(tib, ntib, &tin, 32, &w); \
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create(&heap, &last, (const char *) w, t, 0, && OP_DOCREATE)) \
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X("IMMEDIATE", OP_IMMEDIATE, ) \
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X("DOES>", OP_DOES, *heap++ = (cell_t) && OP_DODOES /* TODO */) \
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X("HERE", OP_HERE, DUP; tos = (cell_t) heap) \
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X("ALLOT", OP_ALLOT, heap = (cell_t *) (tos + (cell_t) heap); tos = *sp--) \
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X("STATE", OP_STATE, DUP; tos = (cell_t) &state) \
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X("BASE", OP_BASE, DUP; tos = (cell_t) &base) \
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X("LAST", OP_LAST, DUP; tos = (cell_t) &last) \
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X("&TIB", OP_TIB, DUP; tos = (cell_t) &tib) \
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X("#TIB", OP_NTIB, DUP; tos = (cell_t) &ntib) \
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X(">IN", OP_TIN, DUP; tos = (cell_t) &tin) \
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X(":", OP_COLON, t = parse(tib, ntib, &tin, 32, &w); \
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create(&heap, &last, (const char *) w, t, 0, && OP_DOCOL); \
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state = -1) \
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X("EXIT", OP_EXIT, ip = (void *) *rp--) \
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X(";", OP_SEMICOLON, *heap++ = (cell_t) last; state = 0) \
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static const char *boot =
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// Comments
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" : ( 41 parse drop drop ; immediate "
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// Useful Basic Compound Words
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" : 2drop ( n n -- ) drop drop ; "
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" : 2dup ( a b -- a b a b ) over over ; "
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" : nip ( a b -- b ) swap drop ; "
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" : rdrop ( r: n n -- ) r> r> drop >r ; "
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" : */ ( n n n -- n ) */mod nip ; "
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" : * ( n n -- n ) 1 */ ; "
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" : /mod ( n n -- n n ) 1 swap */mod ; "
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" : / ( n n -- n ) /mod nip ; "
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" : mod ( n n -- n ) /mod drop ; "
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" : invert ( n -- ~n ) -1 xor ; "
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" : negate ( n -- -n ) invert 1 + ; "
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" : - ( n n -- n ) negate + ; "
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" : rot ( a b c -- c a b ) >r swap r> swap ; "
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" : -rot ( a b c -- b c a ) swap >r swap r> ; "
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" : cell+ ( n -- n ) cell + ; "
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" : cells ( n -- n ) cell * ; "
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" : < ( a b -- a<b ) - 0< ; "
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" : > ( a b -- a>b ) swap - 0< ; "
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" : = ( a b -- a!=b ) - 0= ; "
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" : <> ( a b -- a!=b ) = 0= ; "
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" : emit ( n -- ) >r rp@ 1 type rdrop ; "
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" : bl 32 ; : space bl emit ; "
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" : nl 10 ; : cr nl emit ; "
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// Compilation State
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" : [ 0 state ! ; immediate "
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" : ] -1 state ! ; immediate "
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// Quoting Words
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" : ' parse-name find ; "
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" : ['] ' aliteral ; immediate "
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" : char parse-name drop c@ ; "
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" : [char] char aliteral ; immediate "
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" : literal aliteral ; immediate "
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// Core Control Flow
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" : begin here ; immediate "
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" : again ['] branch , , ; immediate "
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" : until ['] 0branch , , ; immediate "
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" : ahead ['] branch , here 0 , ; immediate "
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" : then here swap ! ; immediate "
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" : if ['] 0branch , here 0 , ; immediate "
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" : else ['] branch , here 0 , swap here swap ! ; immediate "
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// Compound words requiring conditionals
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" : min 2dup < if drop else nip then ; "
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" : max 2dup < if nip else drop then ; "
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// Postpone - done here so we have ['] and IF
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" : >flags 2 cells - @ ; "
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" : immediate? >flags 1 and 1 - 0= ; "
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" : postpone ' dup immediate? if , else aliteral ['] , , then ; immediate "
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// Counted Loops
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" : do postpone swap postpone >r postpone >r here ; immediate "
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" : i postpone r@ ; immediate "
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" : unloop postpone rdrop postpone rdrop ; immediate "
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" : +loop postpone r> postpone + postpone r> "
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" postpone 2dup postpone >r postpone >r "
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" postpone < postpone 0= postpone until "
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" postpone unloop ; immediate "
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" : loop 1 aliteral postpone +loop ; immediate "
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// Constants and Variables
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" : constant create , does> @ ; "
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" : variable create 0 , ; "
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// Exceptions
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" variable handler "
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" : catch sp@ >r handler @ >r rp@ handler ! execute r> handler ! r> drop 0 ; "
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" : throw handler @ rp! r> handler ! r> swap >r sp! drop r> ; "
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// Examine Dictionary
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" : >link ( xt -- a ) 1 cells - @ ; : >flags 2 cells - ; "
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" : >name ( xt -- a n ) dup 3 cells - @ swap over - 3 cells - swap ; "
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" : >body ( xt -- a ) cell+ ; "
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" : see. ( xt -- ) >name type space ; "
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" : see-one ( xt -- xt+1 ) "
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" dup @ dup ['] dolit: = if drop cell+ dup @ . else see. then cell+ ; "
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" : exit= ( xt -- ) ['] exit = ; "
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" : see-loop >body begin see-one dup @ exit= until ; "
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" : see cr ['] : see. ' dup see. see-loop drop ['] ; see. cr ; "
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" : words last @ begin dup >name type space >link dup 0= until drop cr ; "
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;
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static cell_t find(cell_t *last, cell_t *name, cell_t len, cell_t *ret) {
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return 0;
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}
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static void create(cell_t **heap, cell_t **last,
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const char *name, cell_t length, cell_t flags, void *op) {
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cell_t *start = *heap;
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*(*heap)++ = length; // length
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memcpy((*heap), name, length); // name
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(*heap) += ((sizeof(name) + sizeof(cell_t) - 1) >> CELL_BITS);
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*(*heap)++ = (cell_t) *last; // link
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*(*heap)++ = flags; // flags
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*(*heap)++ = (cell_t) op; // code
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*last = start;
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}
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static cell_t parse(const char *tib, cell_t ntib, cell_t *tin, cell_t sep, cell_t *ret) {
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return 0;
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}
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int main(int argc, char *argv[]) {
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cell_t *heap = malloc(HEAP_SIZE);
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cell_t *stack = malloc(STACK_SIZE);
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cell_t *rstack = malloc(STACK_SIZE);
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cell_t state = 0, base = 10, *last = 0, tos = 0, t, w;
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cell_t *sp = stack, *rp = rstack;
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dcell_t m, n, d;
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const char *tib = boot;
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cell_t ntib = sizeof(boot), tin = 0;
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cell_t *ip = heap;
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#define X(name, op, code) create(&heap, &last, name, sizeof(name), name[0] == ';', && op);
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OPCODE_LIST
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#undef X
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#define X(name, op, code) op: code; NEXT;
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OPCODE_LIST
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#undef X
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OP_DOCREATE: DUP; tos = w + sizeof(cell_t) * 2; NEXT;
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OP_DODOES: DUP; tos = w + sizeof(cell_t) * 2;
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*++rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t)); NEXT;
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OP_DOCOL: *++rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t)); NEXT;
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}
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