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8 changed files with 27 additions and 29 deletions

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21 How blocks are organized 22 Addressed devices
23 Branching

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blk/023
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Branching
Branching in Collapse OS is limited to 8-bit. This represents
64 word references forward or backward. While this might seem
a bit tight at first, having this limit saves us a non-
negligible amount of resource usage.
The reasoning behind this intentional limit is that huge
branches are generally a indicator that a logic ought to be
simplified. So here's one more constraint for you to help you
towards simplicity.

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blk/353
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: RAM+ [ RAMSTART LITN ] + ; : BIN+ [ BIN( @ LITN ] + ;
: RAM+ [ RAMSTART LITN ] + ;
: BIN+ [ BIN( @ LITN ] + ;
: HERE 0x04 RAM+ ;
: CURRENT* 0x51 RAM+ ; : CURRENT CURRENT* @ ;
: CURRENT* 0x51 RAM+ ;
: CURRENT CURRENT* @ ;
: H@ HERE @ ;
: FIND ( w -- a f ) CURRENT @ SWAP _find ;
: IN> 0x30 RAM+ ; ( current position in INBUF )
: IN( 0x32 RAM+ @ ; ( points to INBUF )
: IN) 0x40 ( buffer size ) IN( + ; ( INBUF's end )
: (infl) 0 IN( DUP IN> ! ! ; ( flush input buffer )
: QUIT
(resRS) 0 0x08 RAM+ ! ( C<* override ) (infl)
(resRS)
0 0x08 RAM+ ! ( 08 == C<* override )
LIT< (main) FIND DROP EXECUTE
;
1 25 LOADR+ ( xcomp core low )

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blk/386 Normal file
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( current position in INBUF )
: IN> 0x30 RAM+ ;
( points to INBUF )
: IN( 0x32 RAM+ @ ;
( points to INBUF's end )
: IN) 0x40 ( buffer size ) IN( + ;
( flush input buffer )
( set IN> to IN( and set IN> @ to null )
: (infl) 0 IN( DUP IN> ! ! ;

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( Now we have "as late as possible" stuff )
: _bchk DUP 0x7f + 0xff > IF LIT< br-ovfl (print) ABORT THEN ;
: DO COMPILE 2>R H@ ; IMMEDIATE
: LOOP COMPILE (loop) H@ - _bchk , ; IMMEDIATE
: LOOP COMPILE (loop) H@ - , ; IMMEDIATE
( LEAVE is implemented in low xcomp )
: LITN 32 , , ( 32 == NUMBER ) ;
( gets its name at the very end. can't comment afterwards )

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blk/398
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: IF ( -- a | a: br cell addr )
: IF ( -- a | a: br cell addr )
COMPILE (?br) H@ 2 ALLOT ( br cell allot )
; IMMEDIATE
: THEN ( a -- | a: br cell addr )
DUP H@ -^ _bchk SWAP ( a-H a ) !
: THEN ( a -- | a: br cell addr )
DUP H@ -^ SWAP ( a-H a ) !
; IMMEDIATE
: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
COMPILE (br)
2 ALLOT
[COMPILE] THEN
H@ 2- ( push a. -2 for allot offset )
DUP H@ -^ SWAP ( a-H a )
!
H@ 2- ( push a. -2 for allot offset )
; IMMEDIATE

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: BEGIN H@ ; IMMEDIATE
: AGAIN COMPILE (br) H@ - _bchk , ; IMMEDIATE
: UNTIL COMPILE (?br) H@ - _bchk , ; IMMEDIATE
: AGAIN COMPILE (br) H@ - , ; IMMEDIATE
: UNTIL COMPILE (?br) H@ - , ; IMMEDIATE
: [ INTERPRET ; IMMEDIATE
: ] R> DROP ;
: LIT< WORD 34 , SCPY 0 C, ; IMMEDIATE

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