[LLVMdev] Python Backend

[Wojciech Daniło]

I'm very interested in this patch. Could you, Roel, upload it somewhere or
maybe put your code to github or something simmilar?

Additional - you're fixing it - could you please provide a little more
information - what should I read to get more informations about writing not
hardware but software backend in LLVM? (Of course the code analysis is one
way, but maybe there is other also).


2012/11/21 Roel Jordans <r.jordans at tue.nl>

> Hi,
>
> I have a version of the old CBackend which is working with the current
> trunk.
>
> I am in the progress of rewriting it into a new version but that project
> is not going as fast as I would hope as I have been distracted by other
> tasks with higher priority lately.
>
> Anyway, for those interested, I can provide patches, optionally
> separated into several parts (core, testing, misc).
>
> I am afraid that the main patch is larger than the LLVM mailing lists
> allows me to send over the list directly
>
> Cheers,
>  Roel
>
> On 21/11/12 00:46, Wojciech Daniło wrote:
>
>> Hi!
>> I'm trying to write LLVM Python Backend (to generate Python code out of
>> LLVM IR)
>> I'm still learning LLVM and for now it is very hard to me to even create
>> simple taksk. I want you to ask 3 questions:
>>
>> ------------------------------**------------------------------**
>> ----------------------
>> 1)
>>   I want to base on some existing code to learn how it was build. I
>> wanted to base on CBackend (which is no longer available from LLVM 3.0
>> up) and of course it does not compile with LLVM 3.2 - giving a lot of
>> errors:
>> (the code is taken from source of LLVM 3.0 and put into
>> $LLVMSRC/projects/<copy of sample project>/lib/Target/CBackend - I hope
>> this is good method to do it)
>> http://pastebin.com/dkbJWpgP
>> Does anybody have this example working under LLVM3.2? I have found on
>> some old mailing lists that CBackend was never working as  it should but
>> it was working for some simple examples - I'm looking for somethingl ike
>> that in LLVM 3.2.
>> If not, what is the best minimal example I can base onto writing my
>> backend?
>>
>> ------------------------------**------------------------------**
>> ----------------------
>> 2)
>> Maybe this question I will answer myself by analising some examples
>> you'll provide as answer to the first question, but maybe it will worth
>> asking it now.
>> So I want to know when to generate a class in Python. So far I know,
>> that in LLVM there are no classes, only functions, but when using the
>> online LLVM generator I can see, that when generating IR from C++ code,
>> the "class" keyword is stored inside of name (or something like name) of
>> function:
>>
>> #include <stdio.h>
>> #include <stdlib.h>
>> class X{
>> public:
>> void f();
>> };
>> void X::f() { printf("inside f");}
>> int main() {  X x;  x.f();}
>>
>> translates into:
>>
>> [...]
>>
>> define  void  @_ZN1X1fEv(%class.X*nocapture  %this)nounwind  uwtablealign
>>  2 {
>>    %1 =tail  call  i32  (i8*, ...)* @printf(i8*getelementptr  inbounds
>> ([9 xi8]* @.str,i64  0,i64  0))
>>    ret  void
>> }
>>
>> [...]
>>
>>
>> How can I access it inside of my function Pass to get know if it was
>> class or not?
>>
>>
>>
>> ------------------------------**------------------------------**
>> ----------------------
>>
>> 3)
>>
>>
>> Is there any manual that will help me discover all these advanced LLVM
>> features needed to write such backend? I have read LLVM Kaleidoscope
>> tutorials, some LLVM tutorials from IBM and lot of articles, but I still
>> feel that I have not knowledge enough.
>>
>>
>>
>> Thank you :)
>>
>>
>>
>
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