move

old-stuff/pm/src/lib.rs

@@ -0,0 +1,46 @@
+use proc_macro::TokenStream;
+
+mod safe_extern;
+mod scratch;
+
+#[proc_macro_attribute]
+pub fn scratch_space(attr: TokenStream, input: TokenStream) -> TokenStream {
+    scratch::scratch_space(attr, input)
+}
+
+/// # safe-extern
+///
+/// Mark foreign functions as to be safe to call.
+///
+/// ```ignore
+/// #[safe_extern]
+/// extern "Rust" {
+///     fn add(a: u8, b: u8) -> u8;
+/// }
+///
+/// fn main() {
+///     assert_eq!(add(1, 2), 3);
+/// }
+/// ```
+///
+/// It works by expanding the above to this
+///
+/// ```ignore
+/// extern "Rust" {
+///     #[link_name = "add"]
+///     fn _safe_extern_inner_add(a: u8, b: u8) -> u8;
+/// }
+/// fn add(a: u8, b: u8) -> u8 {
+///     unsafe { _safe_extern_inner_add(a, b) }
+/// }
+///
+/// fn main() {
+///     assert_eq!(add(1, 2), 3);
+/// }
+/// ```
+///
+/// This is of course unsound and the macro needs to be `unsafe` somehow but I can't be bothered with that right now lol.
+#[proc_macro_attribute]
+pub fn safe_extern(attr: TokenStream, input: TokenStream) -> TokenStream {
+    safe_extern::safe_extern(attr, input)
+}