llvm dev - Apr 2015 - [LLVMdev] Code template for creating an llvm module from scratch

Hi,

I have been looking for code examples to create an LLVM module from
scratch.

The LLVM API is certainly well-documented but may still looks daunting for
some. I have googled, and the only found document on this subject (of
creating an llvm module from scratch):

http://llvm.org/releases/2.6/docs/tutorial/JITTutorial1.html

should be outdated, given that llvm API evolves at each release.  Are you
aware of   a similar, more recent version of the linked ressource? For
information, what I need to do is roughly something like this:

1. create a new module m
2. create a new function f
3. clone the body of an existing function g from a file
4. put some special instructions into f, and call g at the end of f
5. put both f and g into m
6. return an llvm IR code derived from m.

I learned how to handle #4 by writing an LLVM pass (thanks to the 'hello
world' example at http://llvm.org/docs/WritingAnLLVMPass.html), but have
always had difficulties in finding template code for doing  #1~#3 and #5.
Any resource? Thanks for your help.

Zhoulai
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On Sat, Apr 18, 2015 at 8:45 PM, Zhoulai <zell08v at gmail.com>
wrote:
> Hi,
>
> I have been looking for code examples to create an LLVM module from
scratch.
>
> The LLVM API is certainly well-documented but may still looks daunting for
> some. I have googled, and the only found document on this subject (of
> creating an llvm module from scratch):
>
> http://llvm.org/releases/2.6/docs/tutorial/JITTutorial1.html
I guess this may've been the precursor to the Kaleidoscope tutorial
series that's generally kept up-to-date these days:
http://llvm.org/docs/tutorial/
>
> should be outdated, given that llvm API evolves at each release.  Are you
> aware of   a similar, more recent version of the linked ressource? For
> information, what I need to do is roughly something like this:
>
> 1. create a new module m
> 2. create a new function f
> 3. clone the body of an existing function g from a file
> 4. put some special instructions into f, and call g at the end of f
> 5. put both f and g into m
> 6. return an llvm IR code derived from m.
>
> I learned how to handle #4 by writing an LLVM pass (thanks to the ‘hello
> world’ example at http://llvm.org/docs/WritingAnLLVMPass.html), but have
> always had difficulties in finding template code for doing  #1~#3 and #5.
> Any resource? Thanks for your help.
>
> Zhoulai
>
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