how gollvm produces a project llvm-ir

[ZHOU PERTER]

Hi,

i want to use gollvm to produces a project llvm-ir

i use `go build -work -x . 1> transcript.txt 2>&1` and `egrep '(WORK=|llvm-goc -c)' transcript.txt`

to ever `llvm-goc -c` command add `-S -emit-llvm` to produces .ll for each .go file

then i use https://github.com/llir/llvm to transfer llvm ir to go build-in struct,but llir only parse one file 

for simple file it's ok

```

package main

import (

    "fmt"

)

func main(){

    a := "hello_world"

    fmt.Println(a)

}

but for multiple packages project the error `unable to locate ParamAttr enum corresponding to "noundef"` occur when i only provide main.ll。

any way to merger mutli .ll to one .ll or other method so that  i can do multiple packages project data flow analysis?

Thankss,

PERTER

[Than McIntosh]

Hi,

It wasn't clear from your email exactly what you are doing or what the error was you encountered (grepping in the gollvm/LLVM sources didn't turn up any error code similar to "unable to locate ParamAttr enum"), but I think it is safe to say that this isn't a supported use case for gollvm, at least I don't know of anyone who is doing this sort of thing already.

Generating a *.ll IR file for each translation unit and then reading them all together sounds difficult, seems as though you would need some sort of very strong type unification in order to match up types that are common/shared among translation units. Have you tried doing this on C code, for example?

Thanks, Than

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[ZHOU PERTER]

Hi Than,

Thanks for reply

For C or C++ code ,there is a tool wllvm and go version gllvm that can building whole-program llvm-ir,so i wonder is there any same tool in gollvm

PETER

[Than McIntosh]

Hi,

I looked over the gllvm sources, looks interesting. There is no equivalent for gollvm, someone would need to contribute it. I don't see any fundamental reason why it would not work, but I am sure there would be challenges and wrinkles.

One thing to note is that gllvm is emitteding bitcode (*.bc) files, not LLVM IR dumps (*.ll). 

Thanks, Than

To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/1f07839c-164b-4d9b-a19b-2fae422b786fn%40googlegroups.com.