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Go bindings to LLVM. Used as part of TinyGo.

Home Page: https://tinygo.org

License: Other

Go 94.03% C++ 5.67% C 0.31%

golang llvm tinygo

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Not linking llvm

I did

go get github.com/tinygo-org/go-llvm

But it can't seem to link LLVM.

# runtime/cgo
ld: library not found for -lLLVM-12.0.0
clang-12: error: linker command failed with exit code 1 (use -v to see invocation)

I installed LLVM through homebrew:

brew install llvm

brew info llvm

gives me

llvm: stable 12.0.0 (bottled), HEAD [keg-only]
Next-gen compiler infrastructure
https://llvm.org/
/usr/local/Cellar/llvm/12.0.0_1 (9,789 files, 1.5GB)
  Poured from bottle on 2021-05-17 at 18:19:34
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/llvm.rb
License: Apache-2.0 with LLVM-exception
==> Dependencies
Build: cmake ✔, swig ✔
Required: [email protected] ✔
==> Options
--HEAD
	Install HEAD version
==> Caveats
To use the bundled libc++ please add the following LDFLAGS:
  LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib"

llvm is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have llvm first in your PATH, run:
  echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >> /Users/nishant/.bash_profile

For compilers to find llvm you may need to set:
  export LDFLAGS="-L/usr/local/opt/llvm/lib"
  export CPPFLAGS="-I/usr/local/opt/llvm/include"

==> Analytics
install: 25,459 (30 days), 71,165 (90 days), 235,541 (365 days)
install-on-request: 20,777 (30 days), 57,293 (90 days), 188,131 (365 days)
build-error: 0 (30 days)

Hello, is it possible to support LLVM version 13.0.0?
for copying tinygo this is critically important to support go on e2k platforms (Elbrus)
I plan to insert go-llvm into the assembly pipeline with llcrt https://gitflic.ru/project/e2khome/lccrt

Does this work on Windows?

Support for macOS

I see that there's a file for Darwin support, but when I try getting this package on macOS, I get these compilation errors.

Is it possible that this package is trying to use Apple's LLVM (installed through Xcode) instead of the Homebrew version?

$ go get github.com/tinygo-org/go-llvm
# github.com/tinygo-org/go-llvm
In file included from IRBindings.cpp:13:
In file included from go/src/github.com/tinygo-org/go-llvm/IRBindings.h:16:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Core.h:19:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Types.h:17:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/DataTypes.h:28:
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:313:9: error: no member named 'signbit' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:314:9: error: no member named 'fpclassify' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:315:9: error: no member named 'isfinite' in the global namespace; did you mean 'finite'?
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/math.h:749:12: note: 'finite' declared here
In file included from IRBindings.cpp:13:
In file included from go/src/github.com/tinygo-org/go-llvm/IRBindings.h:16:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Core.h:19:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Types.h:17:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/DataTypes.h:28:
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:316:9: error: no member named 'isinf' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:317:9: error: no member named 'isnan' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:318:9: error: no member named 'isnormal' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:319:9: error: no member named 'isgreater' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:320:9: error: no member named 'isgreaterequal' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:321:9: error: no member named 'isless' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:322:9: error: no member named 'islessequal' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:323:9: error: no member named 'islessgreater' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:324:9: error: no member named 'isunordered' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:325:9: error: no member named 'isunordered' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:331:9: error: no member named 'abs' in the global namespace; did you mean 'fabs'?
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/math.h:417:15: note: 'fabs' declared here
In file included from IRBindings.cpp:13:
In file included from go/src/github.com/tinygo-org/go-llvm/IRBindings.h:16:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Core.h:19:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/Types.h:17:
In file included from /usr/local/Cellar/llvm/9.0.0_1/include/llvm-c/DataTypes.h:28:
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:551:38: error: no template named 'is_floating_point'
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:551:76: error: definition or redeclaration of 'type' cannot name the global scope
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:551:76: error: no member named 'type' in the global namespace
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:551:80: error: expected ';' at end of declaration
/usr/local/opt/llvm/bin/../include/c++/v1/cmath:552:27: error: unknown type name '_A1'
fatal error: too many errors emitted, stopping now [-ferror-limit=]

Info

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.15.1

$ brew info llvm                                                                                                                                            
llvm: stable 9.0.0 (bottled), HEAD [keg-only]
Next-gen compiler infrastructure
https://llvm.org/
/usr/local/Cellar/llvm/9.0.0_1 (6,839 files, 3.7GB)
  Poured from bottle on 2019-11-06 at 10:12:51

Support LLVMCreateTypeAttribute

Hello, and thank you for your project! I wrote a compiler in Go for a compiler course, and this project has made converting the compiler over to an LLVM backend super easy.

As I was working on calling some external C code that uses structs, I was trying to use the byval attribute, and noticed that Verify was crashing with a null pointer exception. As of r362128, byval can optionally accept a type, and LLVMCreateEnumAttribute returns the attribute with a null type causing a null pointer access when Verify is checking the module.

The solution here is to use LLVMCreateTypeAttribute which allows you to pass in the attribute kind and type.

I'll try to get a PR for this, but if you feel free if you beat me to it.

how can I "go get" this module?

hello,
I'm trying to run a command specified in the README.

go get github.com/tinygo-org/go-llvm

it gives the following error:

go: github.com/tinygo-org/[email protected]: parsing go.mod:
	module declares its path as: tinygo.org/x/go-llvm
	        but was required as: github.com/tinygo-org/go-llvm

how can I download this module when the github url and module name are different?

TinyGo - Go

Does this binding work for all of Go?

Its hosted by the TinyGo project, and the readme does say nothing about the scope.

Maybe resolve this by a commit to the readme.

Cannot build/install with llvm-14 from apt.llvm.org

System info:

sayotte@x270:~/go/pkg/mod/tinygo.org/x$ cat /etc/issue
Ubuntu 20.04.3 LTS \n \l

sayotte@x270:~/go/pkg/mod/tinygo.org/x$ dpkg-query -l | grep llvm
ii  libllvm12:amd64                                             1:12.0.0-3ubuntu1~20.04.5                                        amd64        Modular compiler and toolchain technologies, runtime library
ii  libllvm12:i386                                              1:12.0.0-3ubuntu1~20.04.5                                        i386         Modular compiler and toolchain technologies, runtime library
ii  libllvm14:amd64                                             1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies, runtime library
ii  llvm-14                                                     1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies
ii  llvm-14-dev                                                 1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies, libraries and headers
ii  llvm-14-linker-tools                                        1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies - Plugins
ii  llvm-14-runtime                                             1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies, IR interpreter
ii  llvm-14-tools                                               1:14.0.6~++20221117072312+f28c006a5895-1~exp1~20221117192323.163 amd64        Modular compiler and toolchain technologies, tools

sayotte@x270:~/go/pkg/mod/tinygo.org/x$ llvm-as-14 --version
Ubuntu LLVM version 14.0.6
  Optimized build.
  Default target: x86_64-pc-linux-gnu
  Host CPU: skylake

go get fails to find header files:

sayotte@x270:~/go/pkg/mod/tinygo.org/x$ go get tinygo.org/x/go-llvm
# tinygo.org/x/go-llvm
[email protected]/analysis.go:16:10: fatal error: llvm-c/Analysis.h: No such file or directory
   16 | #include "llvm-c/Analysis.h" // If you are getting an error here you need to build or install LLVM, see https://tinygo.org/docs/guides/build/
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.

Modify Makefile to use the installed version:

sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ sudo sed -i 's|VERSION=9.0.0|VERSION=14.0.6|' Makefile 
sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ sudo PATH=$PATH make config

go install still fails on the same import:

sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ go install
# tinygo.org/x/go-llvm
./analysis.go:16:10: fatal error: llvm-c/Analysis.h: No such file or directory
   16 | #include "llvm-c/Analysis.h" // If you are getting an error here you need to build or install LLVM, see https://tinygo.org/docs/guides/build/
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.

An attempt with setting CGO_ flags using llvm-config-14 overcomes` that problem, but dies in linking because it's looking for LLVM-15 for some reason???:

sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ cat ~/build.sh 
#!/bin/bash

export CGO_CPPFLAGS=$(llvm-config-14 --cppflags)
export CGO_CFLAGS=$(llvm-config-14 --cflags)
export CGO_LDFLAGS=$(llvm-config-14 --ldflags)
go install

sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ ~/build.sh >~/log 2>&1
sayotte@x270:~/go/pkg/mod/tinygo.org/x/[email protected]$ cat ~/log
# tinygo.org/x/go-llvm
/usr/bin/ld: cannot find -lLLVM-15
collect2: error: ld returned 1 exit statu

I then tried deleting llvm_config_linux_llvm15.go, hoping it was unnecessary and the culprit, but the linker barfed on boatloads of unresolved symbols.

LLVM Intrinsic Support

Hey, is there any reason for you to not to include LLVM's intrinsic functions like LLVMLookupIntrinsicID, LLVMGetIntrinsicDeclaration? They provide easy way to handle intrinsic functions, especially for overloaded ones.

darwin: support LLVM versions other than 11

Currently the darwin config hard-codes LLVM 11. It should be modified to use the same tags as Linux (e.g. llvm13) or updated to use LLVM 13.

Could you also add support for the llvm Disasm API

This is a great project!

Would it be possible to add support for the LLVM MC (Machine Code) library as well?

https://raywang.tech/2017/12/04/Using-the-LLVM-MC-Disassembly-API/#mcdisassembly

Also this might be a dumb question, but I see you using come Cpp files, does that mean you can link against the C++ API as well?

If so would you be able to link against the C++ version of the MC lib? That would allow for doing all kinds of interesting static code analysis in Go ❤️

Build broken on macOS for llvm v16

$ brew install llvm # v16
$ cat main.go
package main

import (
	"fmt"

	"tinygo.org/x/go-llvm"
)

func main() {
	_ = llvm.FlagAppleBlock
	fmt.Println("hello")
}
$ go run main.go
# tinygo.org/x/go-llvm
../../Library/Application Support/go/pkg/mod/tinygo.org/x/[email protected]/analysis.go:16:10: fatal error: 'llvm-c/Analysis.h' file not found
#include "llvm-c/Analysis.h" // If you are getting an error here you need to build or install LLVM, see https://tinygo.org/docs/guides/build/
         ^~~~~~~~~~~~~~~~~~~
1 error generated.

Installing v15 instead works:

$ brew install llvm@15
$ go run main.go
hello

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