ok2
0c6c643e07
HERE is now defined in boot.fth as `: HERE 12 @ ;` (reads SYSVAR_HERE from WASM linear memory). The Rust side syncs user_here to memory[12]: - At the start of each evaluate() call (sync_here_to_wasm) - In each host function that modifies HERE (ALLOT, comma, C-comma, ALIGN) This avoids per-token sync overhead — only 2 sync points per evaluate() call plus host-function writes. Removed the HERE host function closure (~30 lines). All 426 tests pass.
151 lines
4.1 KiB
Forth
151 lines
4.1 KiB
Forth
\ WAFER Bootstrap -- Forth definitions replacing Rust host functions.
|
|
\ Loaded at startup after IR primitives are compiled.
|
|
\ Compiled WASM with direct calls outperforms host function dispatch.
|
|
|
|
\ ---------------------------------------------------------------
|
|
\ Phase 1: Pure stack and memory operations
|
|
\ ---------------------------------------------------------------
|
|
|
|
\ 2OVER ( x1 x2 x3 x4 -- x1 x2 x3 x4 x1 x2 )
|
|
: 2OVER 3 PICK 3 PICK ;
|
|
|
|
\ 2ROT ( x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2 )
|
|
: 2ROT 2>R 2SWAP 2R> 2SWAP ;
|
|
|
|
\ WITHIN ( n lo hi -- flag ) true if lo <= n < hi (unsigned)
|
|
: WITHIN OVER - >R - R> U< ;
|
|
|
|
\ 2@ ( addr -- x1 x2 ) fetch double-cell, low addr = deeper stack
|
|
: 2@ DUP CELL+ @ SWAP @ ;
|
|
|
|
\ 2! ( x1 x2 addr -- ) store double-cell
|
|
: 2! SWAP OVER ! CELL+ ! ;
|
|
|
|
\ 2R@ stays as host function (needs direct return-stack access)
|
|
|
|
\ FILL ( addr u char -- ) fill u bytes with char
|
|
: FILL ROT ROT 0 ?DO 2DUP I + C! LOOP 2DROP ;
|
|
|
|
\ CMOVE ( src dst u -- ) forward byte copy
|
|
: CMOVE 0 ?DO OVER I + C@ OVER I + C! LOOP 2DROP ;
|
|
|
|
\ CMOVE> ( src dst u -- ) backward byte copy (for overlap)
|
|
: CMOVE>
|
|
DUP 0= IF DROP 2DROP EXIT THEN
|
|
1- >R
|
|
BEGIN R@ 0< INVERT WHILE
|
|
OVER R@ + C@ OVER R@ + C!
|
|
R> 1- >R
|
|
REPEAT
|
|
R> DROP 2DROP ;
|
|
|
|
\ MOVE ( src dst u -- ) smart copy (handles overlap)
|
|
: MOVE
|
|
DUP 0= IF DROP 2DROP EXIT THEN
|
|
>R 2DUP U< IF R> CMOVE> ELSE R> CMOVE THEN ;
|
|
|
|
\ ERASE ( addr u -- ) zero fill
|
|
: ERASE 0 FILL ;
|
|
|
|
\ BLANK ( addr u -- ) space fill
|
|
: BLANK BL FILL ;
|
|
|
|
\ /STRING ( addr u n -- addr+n u-n )
|
|
: /STRING ROT OVER + ROT ROT - ;
|
|
|
|
\ -TRAILING ( addr u -- addr u' ) remove trailing spaces
|
|
: -TRAILING
|
|
BEGIN DUP 0> WHILE
|
|
2DUP + 1- C@ BL <> IF EXIT THEN
|
|
1-
|
|
REPEAT ;
|
|
|
|
\ ---------------------------------------------------------------
|
|
\ Phase 2: Double-cell arithmetic
|
|
\ ---------------------------------------------------------------
|
|
|
|
\ D+ ( d1 d2 -- d3 ) double-cell addition with carry
|
|
: D+ >R SWAP >R DUP >R + DUP R> U< IF R> R> + 1+ ELSE R> R> + THEN ;
|
|
|
|
\ DNEGATE ( d -- -d ) double-cell negate (two's complement)
|
|
: DNEGATE INVERT SWAP INVERT SWAP 1 0 D+ ;
|
|
|
|
\ D- ( d1 d2 -- d3 ) double-cell subtraction
|
|
: D- DNEGATE D+ ;
|
|
|
|
\ DABS ( d -- |d| ) double-cell absolute value
|
|
: DABS DUP 0< IF DNEGATE THEN ;
|
|
|
|
\ D0= ( d -- flag ) true if d is zero
|
|
: D0= OR 0= ;
|
|
|
|
\ D0< ( d -- flag ) true if d is negative
|
|
: D0< NIP 0< ;
|
|
|
|
\ D= ( d1 d2 -- flag ) true if d1 = d2
|
|
: D= D- D0= ;
|
|
|
|
\ D< ( d1 d2 -- flag ) true if d1 < d2 (signed)
|
|
: D< D- D0< ;
|
|
|
|
\ D2* ( d -- d*2 ) double-cell shift left
|
|
: D2* 2DUP D+ ;
|
|
|
|
\ D2/ ( d -- d/2 ) double-cell arithmetic shift right
|
|
: D2/ DUP 1 AND 31 LSHIFT >R 2/ SWAP 1 RSHIFT R> OR SWAP ;
|
|
|
|
\ DMAX ( d1 d2 -- d-max ) double-cell maximum
|
|
: DMAX 2OVER 2OVER D< IF 2SWAP THEN 2DROP ;
|
|
|
|
\ DMIN ( d1 d2 -- d-min ) double-cell minimum
|
|
: DMIN 2OVER 2OVER D< INVERT IF 2SWAP THEN 2DROP ;
|
|
|
|
\ M+ ( d n -- d+n ) add single to double
|
|
: M+ S>D D+ ;
|
|
|
|
\ DU< ( ud1 ud2 -- flag ) unsigned double-cell less-than
|
|
: DU< ROT 2DUP = IF 2DROP U< ELSE U< NIP NIP THEN ;
|
|
|
|
\ ---------------------------------------------------------------
|
|
\ Phase 3: Mixed arithmetic (built on M* and UM/MOD host primitives)
|
|
\ ---------------------------------------------------------------
|
|
|
|
\ SM/REM ( d n -- rem quot ) symmetric (truncated) division
|
|
\ Quotient sign: negative if dividend and divisor signs differ.
|
|
\ Remainder sign: same as dividend.
|
|
: SM/REM
|
|
OVER >R
|
|
2DUP XOR >R
|
|
ABS >R DABS R>
|
|
UM/MOD
|
|
R> 0< IF NEGATE THEN
|
|
SWAP R> 0< IF NEGATE THEN
|
|
SWAP ;
|
|
|
|
\ FM/MOD ( d n -- rem quot ) floored division
|
|
: FM/MOD
|
|
DUP >R
|
|
SM/REM
|
|
OVER 0<> OVER 0< AND IF
|
|
1- SWAP R> + SWAP
|
|
ELSE
|
|
R> DROP
|
|
THEN ;
|
|
|
|
\ */ ( n1 n2 n3 -- n4 ) n1*n2/n3 with double intermediate
|
|
: */ >R M* R> FM/MOD SWAP DROP ;
|
|
|
|
\ */MOD ( n1 n2 n3 -- rem quot )
|
|
: */MOD >R M* R> FM/MOD ;
|
|
|
|
\ ---------------------------------------------------------------
|
|
\ Phase 4: HERE and ALIGNED
|
|
\ ---------------------------------------------------------------
|
|
|
|
\ HERE reads from SYSVAR_HERE (offset 12 in WASM memory).
|
|
\ The Rust side syncs user_here to memory[12] before each evaluate call
|
|
\ and whenever host ALLOT/comma modifies it.
|
|
: HERE 12 @ ;
|
|
|
|
\ ALIGNED is already an IR primitive in the compiler.
|