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Implemented address changes and rewind detection

This commit is contained in:
Andrew Alderwick 2021-05-14 21:22:55 +01:00
parent 0367110b80
commit ac91aea27b
1 changed files with 21 additions and 3 deletions
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24
projects/software/asma.usm
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@ -136,6 +136,7 @@
;asma/pass LDA #01 ADD ;asma/pass STA
#00 ;asma/state STA
#0000 ;asma/addr STA2
#0100 ;asma/written-addr STA2
#0001 ;asma/line STA2
JMP2r
@ -170,7 +171,7 @@
POP POP2 POP2
JMP2r
@asma [ &pass $1 &state $1 &line $2 &token $2 &orig-token $2 &heap $2 &addr $2 &scope-addr $2 &error $2 ]
@asma [ &pass $1 &state $1 &line $2 &token $2 &orig-token $2 &heap $2 &addr $2 &written-addr $2 &scope-addr $2 &error $2 ]
@asma-trees [ &labels $2 &macros $2 &opcodes $2 &scope $2 ]
@asma-assemble-token ( string-ptr* -- )
@ -323,13 +324,30 @@
JMP2r
@asma-write-byte ( byte -- )
;asma/addr LDA2 ;asma/written-addr LDA2
LTH2k ,&rewound JCN
&loop
EQU2k ,&ready JCN
#00 ,&write JSR
#0001 ADD2
,&loop JMP
&ready
POP2 #0001 ADD2
DUP2 ;asma/addr STA2
;asma/written-addr STA2
&write
#3e .Console/char ;asma/pass LDA asma-DEO
#20 .Console/char ;asma/pass LDA asma-DEO
.Console/byte ;asma/pass LDA asma-DEO ( FIXME actually write! )
#0a .Console/char ;asma/pass LDA asma-DEO
;asma/addr LDA2 #0001 ADD2 ;asma/addr STA2
JMP2r
&rewound
;asma-msg-rewound ;asma/error STA2
POP2 POP2 POP JMP2r
@asma-write-short ( short -- )
SWP
,asma-write-byte JSR
@ -497,7 +515,6 @@
JMP2r
&valid
( FIXME complain if rewind after writing nonzeroes )
ADD2 ;asma/addr STA2
JMP2r
@ -659,6 +676,7 @@
@asma-msg-relative "Address 20 "outside 20 "range 00
@asma-msg-label "Label 20 "not 20 "found 00
@asma-msg-macro "Macro 20 "already 20 "exists 00
@asma-msg-rewound "Memory 20 "overwrite 00
( trees )