[LLVMdev] LLVM bytecode simulator/emulator?

[Kenneth Hoste]

Chris Lattner wrote:
> On Fri, 14 Jul 2006, Kenneth Hoste wrote:
>> Besides that, I can probably rely on the expierence of some people on 
>> this mailinglist?
> 
> You can always ask, but realize you are at the mercy of people's 
> goodwill, so you can't count on anything.  In practice, we try to help, 
> but are often very busy.

I understand, but any help I can get will be usefull I think. And, for 
what it's worth, my work will help LLVM growing, right?

2 more questions which can get me started:

- Is there a particular version of glibc I should start from? 
llvm/runtime doesn't mention any version numbers (or I must have missed 
them).

- If I'm correct, supporting new glibc functions means adding an 
implementation for them in llvm/runtime/GCCLibraries/libc/io.c (for 
example). Currently, only 'puts' is supported there.
Only, in my current setup, the runtime libraries seem to be skipped:

konijn:~/work/LLVM/bin boegel$ make
Makefile:22: Skipping runtime libraries, llvm-gcc 4 detected.

Why is that? Can I fix this by changing my configuration?

> 
>> What is the best way to start such an ambitious project? Do I just 
>> check which external functions are called in the bytecode I get, and 
>> try to support those functions using LLVM code?
> 
> llvm-dis < foo.bc | grep '^declare' will tell you all the external 
> functions.
>

OK, thanks.

>> Why has no-one supported printf yet? Is it that hard (I have no idea 
>> really, I'm only asking)?
> 
> No one has needed it.
> 

Well, I guess other people will be able to benefit from it, if I get it 
to work that is :)

Kenneth

-- 
Statistics are like a bikini. What they reveal is suggestive, but what 
they conceal is vital (Aaron Levenstein)

Kenneth Hoste
ELIS - Ghent University
kenneth.hoste at elis.ugent.be
http://www.elis.ugent.be/~kehoste