Add WR_DESTRUCTOR_SAFE_FUNC stuff

sample-input/bindings.rs

@@ -696,7 +696,7 @@ pub extern "C" fn wr_renderer_current_epoch(renderer: &mut WrRenderer,
     return false;
 }
 
-#[no_mangle]
+#[no_mangle] #[destructor_safe]
 pub unsafe extern "C" fn wr_renderer_delete(renderer: *mut WrRenderer) {
     Box::from_raw(renderer);
 }
@@ -722,7 +722,7 @@ pub unsafe extern "C" fn wr_rendered_epochs_next(pipeline_epochs: &mut WrRendere
     return false;
 }
 
-#[no_mangle]
+#[no_mangle] #[destructor_safe]
 pub unsafe extern "C" fn wr_rendered_epochs_delete(pipeline_epochs: *mut WrRenderedEpochs) {
     Box::from_raw(pipeline_epochs);
 }
@@ -786,7 +786,7 @@ pub extern "C" fn wr_window_new(window_id: WrWindowId,
     return true;
 }
 
-#[no_mangle]
+#[no_mangle] #[destructor_safe]
 pub unsafe extern "C" fn wr_api_delete(api: *mut RenderApi) {
     let api = Box::from_raw(api);
     api.shut_down();
@@ -937,7 +937,7 @@ pub extern "C" fn wr_api_generate_frame(api: &mut RenderApi) {
     api.generate_frame(None);
 }
 
-#[no_mangle]
+#[no_mangle] #[destructor_safe]
 pub extern "C" fn wr_api_send_external_event(api: &mut RenderApi, evt: usize) {
     assert!(unsafe { !is_in_render_thread() });
 

src/main.rs

@@ -14,6 +14,14 @@ fn has_no_mangle(attrs: &Vec<Attribute>) -> bool {
     has_attribute(MetaItem::Word(Ident::new("no_mangle")), attrs)
 }
 
+fn wr_func_body(attrs: &Vec<Attribute>) -> String {
+    if has_attribute(MetaItem::Word(Ident::new("destructor_safe")), attrs) {
+        String::from("WR_DESTRUCTOR_SAFE_FUNC")
+    } else {
+        String::from("WR_FUNC")
+    }
+}
+
 fn is_c_abi(abi: &Option<Abi>) -> bool {
     abi == &Some(Abi::Named(String::from("C")))
 }
@@ -75,14 +83,15 @@ fn main() {
         match item.node {
             ItemKind::Fn(decl, _unsafe, _const, abi, _generic, _block) => {
                 if has_no_mangle(&item.attrs) && is_c_abi(&abi) {
-                    println!("WR_INLINE {}\n{}({})\nWR_FUNC;\n",
+                    println!("WR_INLINE {}\n{}({})\n{};\n",
                              map_return_type(&decl.output),
                              item.ident,
                              decl.inputs
                                  .iter()
                                  .map(map_arg)
                                  .collect::<Vec<_>>()
-                                 .join(", "));
+                                 .join(", "),
+                             wr_func_body(&item.attrs));
                 }
             }
             _ => {}