Decompiler For C++

franz see

Sep 23 2006, 04:45 PM

I'm interested in a decompiler for C++ (that works in Win XP). Preferably, Open Source, if not, a freeware....or at least a free tial

Thanks a bunch

osknockout

Sep 26 2006, 01:05 AM

Hmm... kind of hard to answer actually. You could try Boomerang.

Although if you're on the holy grail to decompiling,
it'd be easier to write something yourself.

The real problem with decompiling anything into C++ though is that
1)you're assuming that the code is C++ compatible

- suppose it was a microkernel that used an x86 assembly/Perl mix.
(hypothetical case, don't flame me saying "who'd do that?")
So 'LOADALL .... CMOV ....' and (on the top of my head guys) "/help+.?/"
could be in there. Suppose we tried to decompile that to C++.

That asm code could be something like
inline(db 0x0F 0x07 0x4A 1A) in C++ - ok, that's not real inline style, but go with it.
sure it's in C++, but does that make any sense to a C++ programmer?
And I'm not even going to try the Perl expression.
Just realize there's a bunch of <cstring> functions involved.

2)you're ok with reading code in only one style.

- Seriously, if you plan on using a decompiler for a high level language
is that all variables will be named systematically. Like maybe a,b,c...
for example. So std::cout << (char) currency << dollars could be
reduced to std::cout << a << b. So you'd have to go back and try
and figure out what every little variable means. That's rather
pain consuming for a large project. It'd probably be easier just learning
assembly to decompile the program because C++ is a language of abstraction.
And abstraction does not go well with arbitrary, hard to remember variables.

franz see

Sep 26 2006, 01:35 AM

QUOTE(osknockout @ Sep 26 2006, 01:05 AM)

Hmm... kind of hard to answer actually. You could try Boomerang.

Wow ! Great ! An open source project ! Thanks for the tip

I'd try to check it out this weekend and take a look at it

QUOTE(osknockout @ Sep 26 2006, 01:05 AM)

Although if you're on the holy grail to decompiling,
it'd be easier to write something yourself.

The real problem with decompiling anything into C++ though is that
1)you're assuming that the code is C++ compatible

- suppose it was a microkernel that used an x86 assembly/Perl mix.
(hypothetical case, don't flame me saying "who'd do that?")
So 'LOADALL .... CMOV ....' and (on the top of my head guys) "/help+.?/"
could be in there. Suppose we tried to decompile that to C++.

That asm code could be something like
inline(db 0x0F 0x07 0x4A 1A) in C++ - ok, that's not real inline style, but go with it.
sure it's in C++, but does that make any sense to a C++ programmer?
And I'm not even going to try the Perl expression.
Just realize there's a bunch of <cstring> functions involved.

Don't worry

I don't expect the decompiler to work on non-C++ compatible

Besides, I'd probably not encounter that anyway in my basic use of it

QUOTE(osknockout @ Sep 26 2006, 01:05 AM)

2)you're ok with reading code in only one style.

- Seriously, if you plan on using a decompiler for a high level language
is that all variables will be named systematically. Like maybe a,b,c...
for example. So std::cout << (char) currency << dollars could be
reduced to std::cout << a << b. So you'd have to go back and try
and figure out what every little variable means. That's rather
pain consuming for a large project. It'd probably be easier just learning
assembly to decompile the program because C++ is a language of abstraction.
And abstraction does not go well with arbitrary, hard to remember variables.

Yes, I figure that much

But i think im up to the task of refactoring the output of the decompiler

hehe

Thanks again

osknockout

Sep 26 2006, 01:39 AM

Lol, best of luck then. Sounds like you're decompiling a program you wrote and then deleted the source too.
Do tell if you have any problems with Boomerang.

tydes

Oct 6 2006, 09:06 AM

I want to ask, how to decompile C++ programs that have been obfuscated????

I can't decompile it

osknockout

Oct 13 2006, 10:23 PM

I suggest you use an assembly decompiler.

It's obfuscated, so it's already loopy, if anything it
should make more sense in asm.

But seriously, what do you mean you can't decompile it?
Do you mean that it just won't decompile or that the output makes no sense?

iGuest

Oct 11 2007, 08:39 PM

Hi guys. I am a member of staff for an online game called Chain of Command. We are a growing community of players returning to a game lost long ago when 2am games company went bankrupt.

At present the game is full of glitches. But we only have a compiled version of the game. We can't fix anything. For 3 years we've been searching for a way to get the source code so we can fix the game, from hiring Private Investigators to help track down the original programmers, to talking to professionals who would charge us $40k to $60k. We are a free game and run on donations, we clearly don't have that kind of cash.

Now, with my sob story over, anyone have any suggestions? I am a programmer and I'm getting to grips with C++. Another guy on our team is an excellent C++ coder. So once we get the source code I'm sure we can make improvements.

I'd appreciate any help with this. I downloaded and ran boomerang, but it commits an illegal operation during the Decompile stage. I've tried a few times with different downloads of the software. This may be caused by one of the many glitches in the coding :)

We can have considered rewriting the game from scratch, but apart from the workload being far too heavy for our small staff, there are equations within the code that we could never recreate accurately. We aren't looking for the easy way out. This is our last resort, as we would obviously like an original copy of the commented source code with all the variables intact.

Sorry for the length of this post :) And thanks in advance for any help.

-SlickRed

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Decompiler For C++ - Any suggestion?

Decompiler For C++ - Any suggestion?