Virgil Dupras
c1b09123f1
zasm: add support for RETI and RETN
2019-05-17 13:21:49 -04:00
Virgil Dupras
7083116379
zasm: remove JUMP_ prefixes
...
They serve no purpose and make the code less flexible.
2019-05-17 09:50:11 -04:00
Virgil Dupras
e9244b80ee
zasm: big I/O overhaul
...
Instead of buffering input in memory one line at a time, we go in "just
in time" mode and always read contents directly from I/O, without
buffering.
It forces us to implement a `ioPutback` scheme, but on the other hand it
greatly simplifies cases where multiple tokens are on the same line
(when a label is directly followed by an instruction).
The end result feels much more solid and less hackish.
2019-05-16 07:53:42 -04:00
Virgil Dupras
33a1ee250d
zasm: rename curOutputOffset to ZASM_PC
2019-05-15 13:31:49 -04:00
Virgil Dupras
67803f6cb5
zasm: don't upcase char literals
2019-05-14 15:42:15 -04:00
Virgil Dupras
72d2a8f073
zasm: add support for + expressions
2019-05-14 15:26:29 -04:00
Virgil Dupras
c9deac599e
zasm: add support for LD r, r' instructions
2019-05-13 16:38:09 -04:00
Virgil Dupras
878bc2919f
zasm: add support for relative labels
2019-05-12 22:07:21 -04:00
Virgil Dupras
86cad39de4
zasm: fix wrong logic in .numberTruncated error condition
...
`xor c` didn't do what I thought it did at the time. Newbie mistake,
there are probably a lot like this scattered around...
2019-05-12 21:23:24 -04:00
Virgil Dupras
95f53d0ce3
zasm: support symbols in .dw directive
2019-05-10 21:17:19 -04:00
Virgil Dupras
b87feac785
zasm: add support for labels!
2019-05-09 21:21:08 -04:00
Virgil Dupras
f9ae5ca46b
zasm: simplify readWord calling
...
It always reads in the scratchpad with the same max size. No need for
DE-dancing anymore.
2019-05-01 14:19:43 -04:00
Virgil Dupras
dde5161fc1
zasm: add support for ".db" directive
2019-05-01 11:26:41 -04:00
Virgil Dupras
a00bc8cc4b
zasm: remove the "token" variable
2019-04-30 22:32:12 -04:00
Virgil Dupras
5fd9b7812c
zasm: make each token type parse the remaining of line directly
2019-04-30 21:55:18 -04:00
Virgil Dupras
a7693ffd86
zasm: still inching toward directives
2019-04-30 21:40:22 -04:00
Virgil Dupras
1ffe05dd09
zasm: creep in the notion of directive
2019-04-30 21:27:44 -04:00
Virgil Dupras
8241298c8f
zasm: code consolidation
2019-04-30 21:13:37 -04:00
Virgil Dupras
98ad223ee1
zasm: introduce the concept of instruction ID
...
It will make tokenization cleaner and it also makes the instruction
table significantly more compact.
2019-04-30 20:26:41 -04:00
Virgil Dupras
57c3dfece8
zasm: assemble multiple lines at once
2019-04-30 15:51:39 -04:00
Virgil Dupras
2653826dff
zasm: move zasm.asm to instr.asm and create main.asm
...
instr.asm is for single instruction assembly.
2019-04-30 13:52:14 -04:00
