Work on macro binding generation, some cleanup needed, rename runner to plugin

crates/plugin/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "plugin"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = "1.0"
+bincode = "1.3"
+rust_plugin_macros = { path = "../plugin_macros" }

crates/plugin/src/lib.rs

@@ -0,0 +1,51 @@
+#[repr(C)]
+pub struct Buffer {
+    ptr: *const u8,
+    len: usize,
+}
+
+/// Allocates a buffer with an exact size.
+/// We don't return the size because it has to be passed in anyway.
+#[no_mangle]
+pub extern "C" fn __alloc_buffer(len: usize) -> *const u8 {
+    let vec = vec![0; len];
+    let buffer = unsafe { Buffer::from_vec(vec) };
+    return buffer.ptr;
+}
+
+// /// Frees a given buffer, requires the size.
+// #[no_mangle]
+// pub extern "C" fn __free_buffer(ptr: *const u8, len: usize) {
+//     let buffer = Buffer { ptr, len };
+//     let vec = unsafe { buffer.to_vec() };
+//     std::mem::drop(vec);
+// }
+
+impl Buffer {
+    #[inline(always)]
+    pub unsafe fn to_vec(&self) -> Vec<u8> {
+        slice::from_raw_parts(self.ptr, self.len).to_vec()
+    }
+
+    #[inline(always)]
+    pub unsafe fn from_vec(mut vec: Vec<u8>) -> Buffer {
+        vec.shrink_to(0);
+        let ptr = vec.as_ptr();
+        let len = vec.len();
+        std::mem::forget(vec);
+        Buffer { ptr, len }
+    }
+
+    #[inline(always)]
+    pub fn leak_to_heap(self) -> *const Buffer {
+        let boxed = Box::new(self);
+        let ptr = Box::<Buffer>::into_raw(boxed) as *const Buffer;
+        return ptr;
+    }
+}
+
+pub mod prelude {
+    pub use super::{Buffer, __alloc_buffer};
+    #[macro_use]
+    pub use plugin_macros::bind;
+}