From f41ae64722ab8e501e2123018d1b0101db32442e Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Tue, 23 Mar 2021 11:22:33 +0800
Subject: Ignore proc-macro stdout to prevent IPC crash

---
 crates/proc_macro_api/src/msg.rs | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

(limited to 'crates/proc_macro_api/src')

diff --git a/crates/proc_macro_api/src/msg.rs b/crates/proc_macro_api/src/msg.rs
index 970f165ed..21e56cc83 100644
--- a/crates/proc_macro_api/src/msg.rs
+++ b/crates/proc_macro_api/src/msg.rs
@@ -77,13 +77,24 @@ impl Message for Request {}
 impl Message for Response {}
 
 fn read_json(inp: &mut impl BufRead) -> io::Result<Option<String>> {
-    let mut buf = String::new();
-    inp.read_line(&mut buf)?;
-    buf.pop(); // Remove trailing '\n'
-    Ok(match buf.len() {
-        0 => None,
-        _ => Some(buf),
-    })
+    loop {
+        let mut buf = String::new();
+        inp.read_line(&mut buf)?;
+        buf.pop(); // Remove trailing '\n'
+
+        if buf.is_empty() {
+            return Ok(None);
+        }
+
+        // Some ill behaved macro try to use stdout for debugging
+        // We ignore it here
+        if !buf.starts_with("{") {
+            log::error!("proc-macro tried to print : {}", buf);
+            continue;
+        }
+
+        return Ok(Some(buf));
+    }
 }
 
 fn write_json(out: &mut impl Write, msg: &str) -> io::Result<()> {
-- 
cgit v1.2.3


From 79f583ed6622be591886f99974766a3aeda39182 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Wed, 24 Mar 2021 03:47:08 +0800
Subject: Improve message usage in proc-macro

Reuse storage for the buffer send to child process of proc-macro.
---
 crates/proc_macro_api/src/msg.rs     | 12 ++++++++----
 crates/proc_macro_api/src/process.rs |  7 +++++--
 2 files changed, 13 insertions(+), 6 deletions(-)

(limited to 'crates/proc_macro_api/src')

diff --git a/crates/proc_macro_api/src/msg.rs b/crates/proc_macro_api/src/msg.rs
index 21e56cc83..f525df152 100644
--- a/crates/proc_macro_api/src/msg.rs
+++ b/crates/proc_macro_api/src/msg.rs
@@ -55,8 +55,8 @@ pub enum ErrorCode {
 }
 
 pub trait Message: Serialize + DeserializeOwned {
-    fn read(inp: &mut impl BufRead) -> io::Result<Option<Self>> {
-        Ok(match read_json(inp)? {
+    fn read(inp: &mut impl BufRead, buf: &mut String) -> io::Result<Option<Self>> {
+        Ok(match read_json(inp, buf)? {
             None => None,
             Some(text) => {
                 let mut deserializer = serde_json::Deserializer::from_str(&text);
@@ -76,9 +76,13 @@ pub trait Message: Serialize + DeserializeOwned {
 impl Message for Request {}
 impl Message for Response {}
 
-fn read_json(inp: &mut impl BufRead) -> io::Result<Option<String>> {
+fn read_json<'a>(
+    inp: &mut impl BufRead,
+    mut buf: &'a mut String,
+) -> io::Result<Option<&'a String>> {
     loop {
-        let mut buf = String::new();
+        buf.clear();
+
         inp.read_line(&mut buf)?;
         buf.pop(); // Remove trailing '\n'
 
diff --git a/crates/proc_macro_api/src/process.rs b/crates/proc_macro_api/src/process.rs
index 30bb1b687..99d05aef3 100644
--- a/crates/proc_macro_api/src/process.rs
+++ b/crates/proc_macro_api/src/process.rs
@@ -90,8 +90,10 @@ impl ProcMacroProcessSrv {
 fn client_loop(task_rx: Receiver<Task>, mut process: Process) {
     let (mut stdin, mut stdout) = process.stdio().expect("couldn't access child stdio");
 
+    let mut buf = String::new();
+
     for Task { req, result_tx } in task_rx {
-        match send_request(&mut stdin, &mut stdout, req) {
+        match send_request(&mut stdin, &mut stdout, req, &mut buf) {
             Ok(res) => result_tx.send(res).unwrap(),
             Err(err) => {
                 log::error!(
@@ -152,7 +154,8 @@ fn send_request(
     mut writer: &mut impl Write,
     mut reader: &mut impl BufRead,
     req: Request,
+    buf: &mut String,
 ) -> io::Result<Option<Response>> {
     req.write(&mut writer)?;
-    Response::read(&mut reader)
+    Response::read(&mut reader, buf)
 }
-- 
cgit v1.2.3