ffi: basic example

Author: ryangjchandler

Cargo.toml

@@ -2,5 +2,6 @@
 members = [
  "trunk_lexer",
  "trunk_parser",
- "trunk_interpreter"
+ "trunk_interpreter",
+ "trunk_ffi"
 ]

trunk_ffi/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "trunk_ffi"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+trunk_parser = { path = "../trunk_parser" }

trunk_ffi/src/lib.rs

@@ -0,0 +1,8 @@
+#[no_mangle]
+pub extern "C" fn fib(n: i32) -> i32 {
+ if n < 2 {
+ return n;
+ }
+
+ return fib(n - 1) + fib(n - 2);
+}