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z80: fix tricky memory initialization issue

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Among random "better safe than sorry" changes, the real fix is in
changing "4" for "5" above _find declaration. This off-by-one error
had that word, which is the root word in z80, have a 0x01 prev field
instead of a 0x00 one.

When all memory was initialized to zero, it didn't matter, we ended
up hitting 0 prev and considered ourselves properly at the end of
dict.

When memory wasn't initialized, however, we would end up jumping at
all kinds of places, leading to random behavior.
This commit is contained in:
Virgil Dupras 2020-08-15 16:37:58 -04:00
parent ba8a9c2647
commit 31a58d00f1
5 changed files with 6 additions and 6 deletions
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4
blk/213
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@ -1,5 +1,5 @@
VARIABLE ORG CREATE ORG 0 ,
VARIABLE BIN( 0 BIN( ! CREATE BIN( 0 ,
VARIABLE L1 VARIABLE L2 VARIABLE L3 VARIABLE L4 VARIABLE L1 VARIABLE L2 VARIABLE L3 VARIABLE L4
: A 7 ; : B 0 ; : C 1 ; : D 2 ; : A 7 ; : B 0 ; : C 1 ; : D 2 ;
: E 3 ; : H 4 ; : L 5 ; : (HL) 6 ; : E 3 ; : H 4 ; : L 5 ; : (HL) 6 ;

2
blk/243
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@ -3,7 +3,7 @@
: BJP, BIN( @ + JP, ; : BJP, BIN( @ + JP, ;
: BJPc, BIN( @ + JPc, ; : BJPc, BIN( @ + JPc, ;
VARIABLE lblchkPS CREATE lblchkPS 0 ,
: chkPS, lblchkPS @ CALL, ; ( chkPS, B305 ) : chkPS, lblchkPS @ CALL, ; ( chkPS, B305 )
CREATE lblnext 0 , ( stable ABI until set in B300 ) CREATE lblnext 0 , ( stable ABI until set in B300 )
: JPNEXT, lblnext @ ?DUP IF JP, ELSE 0x1a BJP, THEN ; : JPNEXT, lblnext @ ?DUP IF JP, ELSE 0x1a BJP, THEN ;

2
blk/263
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@ -1,4 +1,4 @@
VARIABLE XCURRENT CREATE XCURRENT 0 ,
: XCON XCURRENT CURRENT* ! ; : XCON XCURRENT CURRENT* ! ;
: XCOFF 0x02 RAM+ CURRENT* ! ; : XCOFF 0x02 RAM+ CURRENT* ! ;
: (xentry) XCON (entry) XCOFF ; : (xentry) XCON (entry) XCOFF ;

2
blk/291
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@ -1,5 +1,5 @@
( Native words ) ( Native words )
H@ 4 + XCURRENT ! ( make next CODE have 0 prev field ) H@ 5 + XCURRENT ! ( make next CODE have 0 prev field )
CODE _find ( cur w -- a f ) CODE _find ( cur w -- a f )
HL POP, ( w ) DE POP, ( cur ) chkPS, HL POP, ( w ) DE POP, ( cur ) chkPS,
HL PUSH, ( --> lvl 1 ) HL PUSH, ( --> lvl 1 )

2
blk/387
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@ -10,7 +10,7 @@
: BS? DUP 0x7f = SWAP 0x8 = OR ; : BS? DUP 0x7f = SWAP 0x8 = OR ;
: KEY : KEY
85 RAM+ @ ( (key) override ) 0x55 RAM+ @ ( (key) override )
?DUP IF EXECUTE ELSE (key) THEN ; ?DUP IF EXECUTE ELSE (key) THEN ;
( cont.: read one char into input buffer and returns whether we ( cont.: read one char into input buffer and returns whether we
should continue, that is, whether CR was not met. ) should continue, that is, whether CR was not met. )