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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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2018-08-08 11:16
iAN CooG

Registered: May 2002
Posts: 1996
by googling i found this, commercial
http://microapl.com/asm2c/index.html
it does 6502 to C
http://microapl.com/asm2c/sample6502.html
2018-08-11 20:09
Groepaz

Registered: Dec 2001
Posts: 8673
decompiling is a quite complex tasks - and most decompilers dont produce useful output. hexrays (IDA) is probably the best BY FAR and even its output is often quite a mess :)

that said, hexrays can do x86 and ARM - not 6502 :)

curious though what you'd want to use it for (that has 6502) - its not like such decompilers would magically produce C code from arbitrary assembler programs, it can only work *somewhat* when the assembler program is a compiled c program.
2018-08-12 00:32
Mixer

Registered: Apr 2008
Posts: 269
Groepaz, this is scene. Magical and impossible are our daily business :) Time to write a better tool. IAN's find is interesting and does seem to do pretty good job.
2018-08-12 00:41
Groepaz

Registered: Dec 2001
Posts: 8673
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: 8673
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]]
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