Drop support for non-syroot proc macro ABIs

crates/proc-macro-srv-cli/src/lib.rs

@@ -0,0 +1,54 @@
+//! Driver for proc macro server
+use std::io;
+
+use proc_macro_api::msg::{self, Message};
+
+#[cfg(feature = "sysroot-abi")]
+pub fn run() -> io::Result<()> {
+    let mut srv = proc_macro_srv::ProcMacroSrv::default();
+    let mut buf = String::new();
+
+    while let Some(req) = read_request(&mut buf)? {
+        let res = match req {
+            msg::Request::ListMacros { dylib_path } => {
+                msg::Response::ListMacros(srv.list_macros(&dylib_path))
+            }
+            msg::Request::ExpandMacro(task) => msg::Response::ExpandMacro(srv.expand(task)),
+            msg::Request::ApiVersionCheck {} => {
+                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
+            }
+        };
+        write_response(res)?
+    }
+
+    Ok(())
+}
+#[cfg(not(feature = "sysroot-abi"))]
+pub fn run() -> io::Result<()> {
+    let mut buf = String::new();
+
+    while let Some(req) = read_request(&mut buf)? {
+        let res = match req {
+            msg::Request::ListMacros { .. } => {
+                msg::Response::ListMacros(Err("server is built without sysroot support".to_owned()))
+            }
+            msg::Request::ExpandMacro(..) => msg::Response::ExpandMacro(Err(msg::PanicMessage(
+                "server is built without sysroot support".to_owned(),
+            ))),
+            msg::Request::ApiVersionCheck {} => {
+                msg::Response::ApiVersionCheck(proc_macro_api::msg::CURRENT_API_VERSION)
+            }
+        };
+        write_response(res)?
+    }
+
+    Ok(())
+}
+
+fn read_request(buf: &mut String) -> io::Result<Option<msg::Request>> {
+    msg::Request::read(&mut io::stdin().lock(), buf)
+}
+
+fn write_response(msg: msg::Response) -> io::Result<()> {
+    msg.write(&mut io::stdout().lock())
+}