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ed2b91411a
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11
blk/023
Normal file
11
blk/023
Normal file
@ -0,0 +1,11 @@
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Branching
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Branching in Collapse OS is limited to 8-bit. This represents
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64 word references forward or backward. While this might seem
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a bit tight at first, having this limit saves us a non-
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negligible amount of resource usage.
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The reasoning behind this intentional limit is that huge
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branches are generally a indicator that a logic ought to be
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simplified. So here's one more constraint for you to help you
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towards simplicity.
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13
blk/353
13
blk/353
@ -1,13 +1,14 @@
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: RAM+ [ RAMSTART LITN ] + ;
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: BIN+ [ BIN( @ LITN ] + ;
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: RAM+ [ RAMSTART LITN ] + ; : BIN+ [ BIN( @ LITN ] + ;
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: HERE 0x04 RAM+ ;
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: CURRENT* 0x51 RAM+ ;
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: CURRENT CURRENT* @ ;
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: CURRENT* 0x51 RAM+ ; : CURRENT CURRENT* @ ;
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: H@ HERE @ ;
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: FIND ( w -- a f ) CURRENT @ SWAP _find ;
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: IN> 0x30 RAM+ ; ( current position in INBUF )
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: IN( 0x32 RAM+ @ ; ( points to INBUF )
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: IN) 0x40 ( buffer size ) IN( + ; ( INBUF's end )
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: (infl) 0 IN( DUP IN> ! ! ; ( flush input buffer )
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: QUIT
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(resRS)
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0 0x08 RAM+ ! ( 08 == C<* override )
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(resRS) 0 0x08 RAM+ ! ( C<* override ) (infl)
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LIT< (main) FIND DROP EXECUTE
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;
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1 25 LOADR+ ( xcomp core low )
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11
blk/386
11
blk/386
@ -1,11 +0,0 @@
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( current position in INBUF )
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: IN> 0x30 RAM+ ;
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( points to INBUF )
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: IN( 0x32 RAM+ @ ;
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( points to INBUF's end )
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: IN) 0x40 ( buffer size ) IN( + ;
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( flush input buffer )
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( set IN> to IN( and set IN> @ to null )
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: (infl) 0 IN( DUP IN> ! ! ;
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3
blk/397
3
blk/397
@ -1,6 +1,7 @@
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( Now we have "as late as possible" stuff )
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: _bchk DUP 0x7f + 0xff > IF LIT< br-ovfl (print) ABORT THEN ;
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: DO COMPILE 2>R H@ ; IMMEDIATE
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: LOOP COMPILE (loop) H@ - , ; IMMEDIATE
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: LOOP COMPILE (loop) H@ - _bchk , ; IMMEDIATE
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( LEAVE is implemented in low xcomp )
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: LITN 32 , , ( 32 == NUMBER ) ;
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( gets its name at the very end. can't comment afterwards )
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5
blk/398
5
blk/398
@ -2,13 +2,12 @@
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COMPILE (?br) H@ 2 ALLOT ( br cell allot )
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; IMMEDIATE
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: THEN ( a -- | a: br cell addr )
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DUP H@ -^ SWAP ( a-H a ) !
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DUP H@ -^ _bchk SWAP ( a-H a ) !
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; IMMEDIATE
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: ELSE ( a1 -- a2 | a1: IF cell a2: ELSE cell )
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COMPILE (br)
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2 ALLOT
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DUP H@ -^ SWAP ( a-H a )
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!
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[COMPILE] THEN
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H@ 2- ( push a. -2 for allot offset )
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; IMMEDIATE
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4
blk/399
4
blk/399
@ -1,6 +1,6 @@
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: BEGIN H@ ; IMMEDIATE
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: AGAIN COMPILE (br) H@ - , ; IMMEDIATE
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: UNTIL COMPILE (?br) H@ - , ; IMMEDIATE
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: AGAIN COMPILE (br) H@ - _bchk , ; IMMEDIATE
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: UNTIL COMPILE (?br) H@ - _bchk , ; IMMEDIATE
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: [ INTERPRET ; IMMEDIATE
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: ] R> DROP ;
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: LIT< WORD 34 , SCPY 0 C, ; IMMEDIATE
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BIN
emul/forth.bin
BIN
emul/forth.bin
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