From fa49e0bf71ccd4bc98df0fa83546250c1b849e2e Mon Sep 17 00:00:00 2001
From: stuebinm
Date: Sun, 11 Apr 2021 03:37:32 +0200
Subject: simple ffi with rust and haskell

so far, only calling rust from haskell, not the other way round.
---
 rusty-haskell/haskell/.gitignore             |  1 +
 rusty-haskell/haskell/rust-haskell-ffi.cabal | 26 ++++++++++++++++++++++++++
 rusty-haskell/haskell/src/FLib.hs            |  8 ++++++++
 rusty-haskell/haskell/src/Main.hs            | 16 ++++++++++++++++
 rusty-haskell/rust/.gitignore                |  1 +
 rusty-haskell/rust/Cargo.lock                |  6 ++++++
 rusty-haskell/rust/Cargo.toml                | 13 +++++++++++++
 rusty-haskell/rust/src/lib.rs                | 11 +++++++++++
 8 files changed, 82 insertions(+)
 create mode 100644 rusty-haskell/haskell/.gitignore
 create mode 100644 rusty-haskell/haskell/rust-haskell-ffi.cabal
 create mode 100644 rusty-haskell/haskell/src/FLib.hs
 create mode 100644 rusty-haskell/haskell/src/Main.hs
 create mode 100644 rusty-haskell/rust/.gitignore
 create mode 100644 rusty-haskell/rust/Cargo.lock
 create mode 100644 rusty-haskell/rust/Cargo.toml
 create mode 100644 rusty-haskell/rust/src/lib.rs

diff --git a/rusty-haskell/haskell/.gitignore b/rusty-haskell/haskell/.gitignore
new file mode 100644
index 0000000..b5e3679
--- /dev/null
+++ b/rusty-haskell/haskell/.gitignore
@@ -0,0 +1 @@
+dist-newstyle/*
diff --git a/rusty-haskell/haskell/rust-haskell-ffi.cabal b/rusty-haskell/haskell/rust-haskell-ffi.cabal
new file mode 100644
index 0000000..c540b57
--- /dev/null
+++ b/rusty-haskell/haskell/rust-haskell-ffi.cabal
@@ -0,0 +1,26 @@
+cabal-version:       >=1.10
+-- Initial package description 'rust-haskell-ffi.cabal' generated by 'cabal
+--  init'.  For further documentation, see
+-- http://haskell.org/cabal/users-guide/
+
+name:                rust-haskell-ffi
+version:             0.1.0.0
+-- synopsis:
+-- description:
+-- bug-reports:
+-- license:
+license-file:        LICENSE
+author:              stuebinm
+maintainer:          stuebinm@disroot.org
+-- copyright:
+-- category:
+build-type:          Simple
+extra-source-files:  CHANGELOG.md
+
+executable rust-haskell-ffi
+  main-is: src/Main.hs
+  other-extensions:    ForeignFunctionInterface
+  build-depends:       base >= 4.7 && < 5
+  default-language:    Haskell2010
+  extra-libraries:     rustlib, pthread
+  extra-lib-dirs:      ../rust/target/release
diff --git a/rusty-haskell/haskell/src/FLib.hs b/rusty-haskell/haskell/src/FLib.hs
new file mode 100644
index 0000000..7fc1d61
--- /dev/null
+++ b/rusty-haskell/haskell/src/FLib.hs
@@ -0,0 +1,8 @@
+module FLib where
+
+import Foreign.C.Types
+import Foreign.C.String
+
+foreign import ccall "double_input" doubleInput :: CInt -> CInt
+--foreign import ccall unsafe "print_string" printString :: CString -> IO ()
+foreign import ccall "print_hello" printHello :: IO ()
diff --git a/rusty-haskell/haskell/src/Main.hs b/rusty-haskell/haskell/src/Main.hs
new file mode 100644
index 0000000..2c6a7ae
--- /dev/null
+++ b/rusty-haskell/haskell/src/Main.hs
@@ -0,0 +1,16 @@
+module Main where
+
+
+import Foreign.C.Types
+import Foreign.C.String
+
+foreign import ccall "double_input" doubleInput :: CInt -> CInt
+--foreign import ccall unsafe "print_string" printString :: CString -> IO ()
+foreign import ccall "print_hello" printHello :: IO ()
+
+
+main :: IO ()
+main = do
+  let b = doubleInput 2
+  printHello
+  putStrLn $ show b
diff --git a/rusty-haskell/rust/.gitignore b/rusty-haskell/rust/.gitignore
new file mode 100644
index 0000000..e420ee4
--- /dev/null
+++ b/rusty-haskell/rust/.gitignore
@@ -0,0 +1 @@
+target/*
diff --git a/rusty-haskell/rust/Cargo.lock b/rusty-haskell/rust/Cargo.lock
new file mode 100644
index 0000000..3cae764
--- /dev/null
+++ b/rusty-haskell/rust/Cargo.lock
@@ -0,0 +1,6 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "rustlib"
+version = "0.1.0"
+
diff --git a/rusty-haskell/rust/Cargo.toml b/rusty-haskell/rust/Cargo.toml
new file mode 100644
index 0000000..0bef17d
--- /dev/null
+++ b/rusty-haskell/rust/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "rustlib"
+version = "0.1.0"
+authors = ["stuebinm <stuebinm@disroot.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+name = "rustlib"
+crate-type = ["staticlib"]
+
+[dependencies]
diff --git a/rusty-haskell/rust/src/lib.rs b/rusty-haskell/rust/src/lib.rs
new file mode 100644
index 0000000..d954f2b
--- /dev/null
+++ b/rusty-haskell/rust/src/lib.rs
@@ -0,0 +1,11 @@
+
+
+#[no_mangle]
+pub extern fn double_input(x: i32) -> i32 {
+    2 * x
+}
+
+#[no_mangle]
+pub extern fn print_hello() {
+    println!("hello, world, from rust!");
+}
-- 
cgit v1.2.3