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Re: 6502bench SourceGen disassembler updated [message #388856 is a reply to message #388189] Tue, 19 November 2019 17:22 Go to previous messageGo to previous message
Anonymous
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Originally posted by: fadden

6502bench SourceGen v1.5.0-dev1 is now available. Key changes:

- Added non-unique local labels.
- Added label annotations.
- Added "go to last change" (moves selection to last edit).

Label annotations let you tack a '?' onto the end of a symbol. So if you're disassembling some code and see something that looks like it might hold high scores, but you're not sure, you can now give it the label "high_score?" instead of something like "high_score_maybe". The '?' is omitted when generating sources.

Non-unique local labels let you define labels with a scope that resets whenever a global variable is encountered. All supported cross-assemblers (64tass, ACME, cc65, Merlin 32) have something like this. For example:

first ldx #$05
:loop dex
bne :loop

second ldy #$03
:loop dey
bne :loop

Because SourceGen is a disassembler and always knows which label goes with which address, you can write things that would gag an assembler:

:loop ldx #$05
:loop dex
bne :loop
dey
bne :loop
beq :done
global nop
:done lda #$01

Labels will be adjusted as needed to generate code that assembles. In this case, the inner loop would become ":loop1", and ":done" would be promoted to a global label.

Newly-created labels now default to global. (They were previously "unique locals", meaning the code generator would try to make them be local, but insisted that they have a unique name.)


The project web site is https://6502bench.com/. Source code and pre-built Windows binaries are available from https://github.com/fadden/6502bench/releases

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