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Forums > C64 Coding > ASM to C
2018-08-08 10:37
Mixer

Registered: Apr 2008
Posts: 269
ASM to C

Are there tools to convert a) disassembler output to some sort of C? b) macro assembler listings to C?

Such a thing can be done by substituting opcodes with their C-statement equals. Has anyone written more sophisticated tools for this?
 
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2018-08-12 00:41
Groepaz

Registered: Dec 2001
Posts: 8676
Quote:
Time to write a better tool.

some things just cant be done automatically - no matter how good the tool is.

some years ago i had the idiotic idea to make a basic v2 to C compiler... guess what, it cant be done either. you cant even convert the basic shit from the test/demo disk automatically :) with asm it will be even more impossible =P
2018-08-12 01:06
Mixer

Registered: Apr 2008
Posts: 269
You are probably correct, but I am not convinced yet. It does not have to be perfect. I am interested in the call structure of some complicated asm code, would like to see some asm math as c math.
2018-08-12 01:13
Groepaz

Registered: Dec 2001
Posts: 8676
for the call structure - use IDA. it can display assembly as flow-chart. THAT works pretty decent at least :) (you will need a "PRO" version, the normal one doesnt have 6502)
2018-08-12 07:30
oziphantom

Registered: Oct 2014
Posts: 205
I build this, which kind of does a thing. Needs more work, only tested on a couple of vsfs etc. I built it after I did most of the hard work on HM, but it helped. I will be visiting it before starting the next one.
https://github.com/oziphantom/CodeTree
It takes guesses at code structure and will tag, if/else, if chains etc.

I want it to be able to modify the regenerator config and add code-data blocks as it finds them, to remove the tediousness of it ;) I also want to be able to get a point where I can see what memory locations are read/written by functions. PRs welcome ;)

Note I don't really know Python so the code is not "pythony"
2018-08-12 07:33
oziphantom

Registered: Oct 2014
Posts: 205
Quote: for the call structure - use IDA. it can display assembly as flow-chart. THAT works pretty decent at least :) (you will need a "PRO" version, the normal one doesnt have 6502)

yeah but Maths is the neigh on impossible part

lda thing
clc
adc thing
sta thing

is trivial and a simple script will give you thing += thing its the
lda table,x
clc
adc otherTable,y
sta thing

you want converted and that is really hard to do, as you need to look at the tables and work out what the magic values are.
thing = x * 0.58 + y * 2.3 good luck..
2018-08-12 07:35
oziphantom

Registered: Oct 2014
Posts: 205
Quote: Quote:
Time to write a better tool.

some things just cant be done automatically - no matter how good the tool is.

some years ago i had the idiotic idea to make a basic v2 to C compiler... guess what, it cant be done either. you cant even convert the basic shit from the test/demo disk automatically :) with asm it will be even more impossible =P


What was the major blocker on basic to C? I would think it mostly has a 1:1 relationship. READ would be the tricky part. Making custom functions would probably need to be beyond scope, but what else?
2018-08-12 11:04
Mixer

Registered: Apr 2008
Posts: 269
@Ozipanthom, true that the decompiler itself does not know that the lookup is a multiplication, and does not know what the multiplier is.

But this is already pretty good for my uses.

thing=mem[table[x]]+mem[otherTable[y]]
2018-08-12 15:05
Groepaz

Registered: Dec 2001
Posts: 8676
Quote:
What was the major blocker on basic to C? I would think it mostly has a 1:1 relationship.

not at all. you can do terrible things in basic v2 which just wont translate to C at all. like GOSUB somewhere, but never RETURN. or reuse parts of one subfunction from another. even after building a control flow graph and duplicating the things that would collide, you'd still end up with dead ends. not worth the trouble, easier to just convert by hand :)

Quote:
READ would be the tricky part.

no not really, thats one of the easier parts infact :=P
2018-08-12 18:55
DanPhillips

Registered: Jan 2003
Posts: 7
Yay back on the forum :)


We once used a bunch of macros to convert 65816 to c.
All the object handling/ai was converted when going from Snes to PC dos.


I don't have a copy of the macros, but I do remember they were "horrendous" :)


Cheers

Dan
2018-08-12 19:19
Groepaz

Registered: Dec 2001
Posts: 8676
ah i did this once when i converted 6502 code to gameboy :)

however - this doesnt make the code more readable at all =D
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