From 349e6c62ada1fa45a8b80edb877b5e7c9d0c306d Mon Sep 17 00:00:00 2001
From: Pavan Kumar Sunkara <pavan.sss1991@gmail.com>
Date: Thu, 13 Aug 2020 02:57:26 +0200
Subject: Rename ra_proc_macro_srv -> proc_macro_srv
---
.../proc_macro_srv/src/proc_macro/bridge/buffer.rs | 149 ++++
.../proc_macro_srv/src/proc_macro/bridge/client.rs | 478 +++++++++++
.../src/proc_macro/bridge/closure.rs | 30 +
.../proc_macro_srv/src/proc_macro/bridge/handle.rs | 73 ++
crates/proc_macro_srv/src/proc_macro/bridge/mod.rs | 408 +++++++++
crates/proc_macro_srv/src/proc_macro/bridge/rpc.rs | 311 +++++++
.../src/proc_macro/bridge/scoped_cell.rs | 84 ++
.../proc_macro_srv/src/proc_macro/bridge/server.rs | 323 +++++++
crates/proc_macro_srv/src/proc_macro/diagnostic.rs | 172 ++++
crates/proc_macro_srv/src/proc_macro/mod.rs | 926 +++++++++++++++++++++
10 files changed, 2954 insertions(+)
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/buffer.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/client.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/closure.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/handle.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/mod.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/rpc.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/scoped_cell.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/bridge/server.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/diagnostic.rs
create mode 100644 crates/proc_macro_srv/src/proc_macro/mod.rs
(limited to 'crates/proc_macro_srv/src/proc_macro')
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/buffer.rs b/crates/proc_macro_srv/src/proc_macro/bridge/buffer.rs
new file mode 100644
index 000000000..dae6ff1d1
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/buffer.rs
@@ -0,0 +1,149 @@
+//! lib-proc-macro Buffer management for same-process client<->server communication.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/buffer.rs
+//! augmented with removing unstable features
+
+use std::io::{self, Write};
+use std::mem;
+use std::ops::{Deref, DerefMut};
+use std::slice;
+
+#[repr(C)]
+struct Slice<'a, T> {
+ data: &'a [T; 0],
+ len: usize,
+}
+
+unsafe impl<'a, T: Sync> Sync for Slice<'a, T> {}
+unsafe impl<'a, T: Sync> Send for Slice<'a, T> {}
+
+impl<'a, T> Copy for Slice<'a, T> {}
+impl<'a, T> Clone for Slice<'a, T> {
+ fn clone(&self) -> Self {
+ *self
+ }
+}
+
+impl<'a, T> From<&'a [T]> for Slice<'a, T> {
+ fn from(xs: &'a [T]) -> Self {
+ Slice { data: unsafe { &*(xs.as_ptr() as *const [T; 0]) }, len: xs.len() }
+ }
+}
+
+impl<'a, T> Deref for Slice<'a, T> {
+ type Target = [T];
+ fn deref(&self) -> &[T] {
+ unsafe { slice::from_raw_parts(self.data.as_ptr(), self.len) }
+ }
+}
+
+#[repr(C)]
+pub struct Buffer<T: Copy> {
+ data: *mut T,
+ len: usize,
+ capacity: usize,
+ extend_from_slice: extern "C" fn(Buffer<T>, Slice<'_, T>) -> Buffer<T>,
+ drop: extern "C" fn(Buffer<T>),
+}
+
+unsafe impl<T: Copy + Sync> Sync for Buffer<T> {}
+unsafe impl<T: Copy + Send> Send for Buffer<T> {}
+
+impl<T: Copy> Default for Buffer<T> {
+ fn default() -> Self {
+ Self::from(vec![])
+ }
+}
+
+impl<T: Copy> Deref for Buffer<T> {
+ type Target = [T];
+ fn deref(&self) -> &[T] {
+ unsafe { slice::from_raw_parts(self.data as *const T, self.len) }
+ }
+}
+
+impl<T: Copy> DerefMut for Buffer<T> {
+ fn deref_mut(&mut self) -> &mut [T] {
+ unsafe { slice::from_raw_parts_mut(self.data, self.len) }
+ }
+}
+
+impl<T: Copy> Buffer<T> {
+ pub(super) fn new() -> Self {
+ Self::default()
+ }
+
+ pub(super) fn clear(&mut self) {
+ self.len = 0;
+ }
+
+ pub(super) fn take(&mut self) -> Self {
+ mem::take(self)
+ }
+
+ pub(super) fn extend_from_slice(&mut self, xs: &[T]) {
+ // Fast path to avoid going through an FFI call.
+ if let Some(final_len) = self.len.checked_add(xs.len()) {
+ if final_len <= self.capacity {
+ let dst = unsafe { slice::from_raw_parts_mut(self.data, self.capacity) };
+ dst[self.len..][..xs.len()].copy_from_slice(xs);
+ self.len = final_len;
+ return;
+ }
+ }
+ let b = self.take();
+ *self = (b.extend_from_slice)(b, Slice::from(xs));
+ }
+}
+
+impl Write for Buffer<u8> {
+ fn write(&mut self, xs: &[u8]) -> io::Result<usize> {
+ self.extend_from_slice(xs);
+ Ok(xs.len())
+ }
+
+ fn write_all(&mut self, xs: &[u8]) -> io::Result<()> {
+ self.extend_from_slice(xs);
+ Ok(())
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ Ok(())
+ }
+}
+
+impl<T: Copy> Drop for Buffer<T> {
+ fn drop(&mut self) {
+ let b = self.take();
+ (b.drop)(b);
+ }
+}
+
+impl<T: Copy> From<Vec<T>> for Buffer<T> {
+ fn from(mut v: Vec<T>) -> Self {
+ let (data, len, capacity) = (v.as_mut_ptr(), v.len(), v.capacity());
+ mem::forget(v);
+
+ // This utility function is nested in here because it can *only*
+ // be safely called on `Buffer`s created by *this* `proc_macro`.
+ fn to_vec<T: Copy>(b: Buffer<T>) -> Vec<T> {
+ unsafe {
+ let Buffer { data, len, capacity, .. } = b;
+ mem::forget(b);
+ Vec::from_raw_parts(data, len, capacity)
+ }
+ }
+
+ extern "C" fn extend_from_slice<T: Copy>(b: Buffer<T>, xs: Slice<'_, T>) -> Buffer<T> {
+ let mut v = to_vec(b);
+ v.extend_from_slice(&xs);
+ Buffer::from(v)
+ }
+
+ extern "C" fn drop<T: Copy>(b: Buffer<T>) {
+ mem::drop(to_vec(b));
+ }
+
+ Buffer { data, len, capacity, extend_from_slice, drop }
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/client.rs b/crates/proc_macro_srv/src/proc_macro/bridge/client.rs
new file mode 100644
index 000000000..cb4b3bdb0
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/client.rs
@@ -0,0 +1,478 @@
+//! lib-proc-macro Client-side types.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/client.rs
+//! augmented with removing unstable features
+
+use super::*;
+
+macro_rules! define_handles {
+ (
+ 'owned: $($oty:ident,)*
+ 'interned: $($ity:ident,)*
+ ) => {
+ #[repr(C)]
+ #[allow(non_snake_case)]
+ pub struct HandleCounters {
+ $($oty: AtomicUsize,)*
+ $($ity: AtomicUsize,)*
+ }
+
+ impl HandleCounters {
+ // FIXME(eddyb) use a reference to the `static COUNTERS`, instead of
+ // a wrapper `fn` pointer, once `const fn` can reference `static`s.
+ extern "C" fn get() -> &'static Self {
+ static COUNTERS: HandleCounters = HandleCounters {
+ $($oty: AtomicUsize::new(1),)*
+ $($ity: AtomicUsize::new(1),)*
+ };
+ &COUNTERS
+ }
+ }
+
+ // FIXME(eddyb) generate the definition of `HandleStore` in `server.rs`.
+ #[repr(C)]
+ #[allow(non_snake_case)]
+ pub(super) struct HandleStore<S: server::Types> {
+ $($oty: handle::OwnedStore<S::$oty>,)*
+ $($ity: handle::InternedStore<S::$ity>,)*
+ }
+
+ impl<S: server::Types> HandleStore<S> {
+ pub(super) fn new(handle_counters: &'static HandleCounters) -> Self {
+ HandleStore {
+ $($oty: handle::OwnedStore::new(&handle_counters.$oty),)*
+ $($ity: handle::InternedStore::new(&handle_counters.$ity),)*
+ }
+ }
+ }
+
+ $(
+ #[repr(C)]
+ pub struct $oty(pub(crate) handle::Handle);
+ // impl !Send for $oty {}
+ // impl !Sync for $oty {}
+
+ // Forward `Drop::drop` to the inherent `drop` method.
+ impl Drop for $oty {
+ fn drop(&mut self) {
+ $oty(self.0).drop();
+ }
+ }
+
+ impl<S> Encode<S> for $oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ let handle = self.0;
+ mem::forget(self);
+ handle.encode(w, s);
+ }
+ }
+
+ impl<S: server::Types> DecodeMut<'_, '_, HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$oty, $oty>
+ {
+ fn decode(r: &mut Reader<'_>, s: &mut HandleStore<server::MarkedTypes<S>>) -> Self {
+ s.$oty.take(handle::Handle::decode(r, &mut ()))
+ }
+ }
+
+ impl<S> Encode<S> for &$oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.0.encode(w, s);
+ }
+ }
+
+ impl<'s, S: server::Types,> Decode<'_, 's, HandleStore<server::MarkedTypes<S>>>
+ for &'s Marked<S::$oty, $oty>
+ {
+ fn decode(r: &mut Reader<'_>, s: &'s HandleStore<server::MarkedTypes<S>>) -> Self {
+ &s.$oty[handle::Handle::decode(r, &mut ())]
+ }
+ }
+
+ impl<S> Encode<S> for &mut $oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.0.encode(w, s);
+ }
+ }
+
+ impl<'s, S: server::Types> DecodeMut<'_, 's, HandleStore<server::MarkedTypes<S>>>
+ for &'s mut Marked<S::$oty, $oty>
+ {
+ fn decode(
+ r: &mut Reader<'_>,
+ s: &'s mut HandleStore<server::MarkedTypes<S>>
+ ) -> Self {
+ &mut s.$oty[handle::Handle::decode(r, &mut ())]
+ }
+ }
+
+ impl<S: server::Types> Encode<HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$oty, $oty>
+ {
+ fn encode(self, w: &mut Writer, s: &mut HandleStore<server::MarkedTypes<S>>) {
+ s.$oty.alloc(self).encode(w, s);
+ }
+ }
+
+ impl<S> DecodeMut<'_, '_, S> for $oty {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ $oty(handle::Handle::decode(r, s))
+ }
+ }
+ )*
+
+ $(
+ #[repr(C)]
+ #[derive(Copy, Clone, PartialEq, Eq, Hash)]
+ pub(crate) struct $ity(handle::Handle);
+ // impl !Send for $ity {}
+ // impl !Sync for $ity {}
+
+ impl<S> Encode<S> for $ity {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.0.encode(w, s);
+ }
+ }
+
+ impl<S: server::Types> DecodeMut<'_, '_, HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$ity, $ity>
+ {
+ fn decode(r: &mut Reader<'_>, s: &mut HandleStore<server::MarkedTypes<S>>) -> Self {
+ s.$ity.copy(handle::Handle::decode(r, &mut ()))
+ }
+ }
+
+ impl<S: server::Types> Encode<HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$ity, $ity>
+ {
+ fn encode(self, w: &mut Writer, s: &mut HandleStore<server::MarkedTypes<S>>) {
+ s.$ity.alloc(self).encode(w, s);
+ }
+ }
+
+ impl<S> DecodeMut<'_, '_, S> for $ity {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ $ity(handle::Handle::decode(r, s))
+ }
+ }
+ )*
+ }
+}
+define_handles! {
+ 'owned:
+ TokenStream,
+ TokenStreamBuilder,
+ TokenStreamIter,
+ Group,
+ Literal,
+ SourceFile,
+ MultiSpan,
+ Diagnostic,
+
+ 'interned:
+ Punct,
+ Ident,
+ Span,
+}
+
+// FIXME(eddyb) generate these impls by pattern-matching on the
+// names of methods - also could use the presence of `fn drop`
+// to distinguish between 'owned and 'interned, above.
+// Alternatively, special 'modes" could be listed of types in with_api
+// instead of pattern matching on methods, here and in server decl.
+
+impl Clone for TokenStream {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl Clone for TokenStreamIter {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl Clone for Group {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl Clone for Literal {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl fmt::Debug for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Literal")
+ // format the kind without quotes, as in `kind: Float`
+ // .field("kind", &format_args!("{}", &self.debug_kind()))
+ .field("symbol", &self.symbol())
+ // format `Some("...")` on one line even in {:#?} mode
+ // .field("suffix", &format_args!("{:?}", &self.suffix()))
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+impl Clone for SourceFile {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl fmt::Debug for Span {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.debug())
+ }
+}
+
+macro_rules! define_client_side {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)*;)*
+ }),* $(,)?) => {
+ $(impl $name {
+ #[allow(unused)]
+ $(pub(crate) fn $method($($arg: $arg_ty),*) $(-> $ret_ty)* {
+ panic!("hello");
+ // Bridge::with(|bridge| {
+ // let mut b = bridge.cached_buffer.take();
+
+ // b.clear();
+ // api_tags::Method::$name(api_tags::$name::$method).encode(&mut b, &mut ());
+ // reverse_encode!(b; $($arg),*);
+
+ // b = bridge.dispatch.call(b);
+
+ // let r = Result::<_, PanicMessage>::decode(&mut &b[..], &mut ());
+
+ // bridge.cached_buffer = b;
+
+ // r.unwrap_or_else(|e| panic::resume_unwind(e.into()))
+ // })
+ })*
+ })*
+ }
+}
+with_api!(self, self, define_client_side);
+
+enum BridgeState<'a> {
+ /// No server is currently connected to this client.
+ NotConnected,
+
+ /// A server is connected and available for requests.
+ Connected(Bridge<'a>),
+
+ /// Access to the bridge is being exclusively acquired
+ /// (e.g., during `BridgeState::with`).
+ InUse,
+}
+
+enum BridgeStateL {}
+
+impl<'a> scoped_cell::ApplyL<'a> for BridgeStateL {
+ type Out = BridgeState<'a>;
+}
+
+thread_local! {
+ static BRIDGE_STATE: scoped_cell::ScopedCell<BridgeStateL> =
+ scoped_cell::ScopedCell::new(BridgeState::NotConnected);
+}
+
+impl BridgeState<'_> {
+ /// Take exclusive control of the thread-local
+ /// `BridgeState`, and pass it to `f`, mutably.
+ /// The state will be restored after `f` exits, even
+ /// by panic, including modifications made to it by `f`.
+ ///
+ /// N.B., while `f` is running, the thread-local state
+ /// is `BridgeState::InUse`.
+ fn with<R>(f: impl FnOnce(&mut BridgeState<'_>) -> R) -> R {
+ BRIDGE_STATE.with(|state| {
+ state.replace(BridgeState::InUse, |mut state| {
+ // FIXME(#52812) pass `f` directly to `replace` when `RefMutL` is gone
+ f(&mut *state)
+ })
+ })
+ }
+}
+
+impl Bridge<'_> {
+ fn enter<R>(self, f: impl FnOnce() -> R) -> R {
+ // Hide the default panic output within `proc_macro` expansions.
+ // NB. the server can't do this because it may use a different libstd.
+ static HIDE_PANICS_DURING_EXPANSION: Once = Once::new();
+ HIDE_PANICS_DURING_EXPANSION.call_once(|| {
+ let prev = panic::take_hook();
+ panic::set_hook(Box::new(move |info| {
+ let hide = BridgeState::with(|state| match state {
+ BridgeState::NotConnected => false,
+ BridgeState::Connected(_) | BridgeState::InUse => true,
+ });
+ if !hide {
+ prev(info)
+ }
+ }));
+ });
+
+ BRIDGE_STATE.with(|state| state.set(BridgeState::Connected(self), f))
+ }
+
+ fn with<R>(f: impl FnOnce(&mut Bridge<'_>) -> R) -> R {
+ BridgeState::with(|state| match state {
+ BridgeState::NotConnected => {
+ panic!("procedural macro API is used outside of a procedural macro");
+ }
+ BridgeState::InUse => {
+ panic!("procedural macro API is used while it's already in use");
+ }
+ BridgeState::Connected(bridge) => f(bridge),
+ })
+ }
+}
+
+/// A client-side "global object" (usually a function pointer),
+/// which may be using a different `proc_macro` from the one
+/// used by the server, but can be interacted with compatibly.
+///
+/// N.B., `F` must have FFI-friendly memory layout (e.g., a pointer).
+/// The call ABI of function pointers used for `F` doesn't
+/// need to match between server and client, since it's only
+/// passed between them and (eventually) called by the client.
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct Client<F> {
+ // FIXME(eddyb) use a reference to the `static COUNTERS`, instead of
+ // a wrapper `fn` pointer, once `const fn` can reference `static`s.
+ pub(super) get_handle_counters: extern "C" fn() -> &'static HandleCounters,
+ pub(super) run: extern "C" fn(Bridge<'_>, F) -> Buffer<u8>,
+ pub(super) f: F,
+}
+
+/// Client-side helper for handling client panics, entering the bridge,
+/// deserializing input and serializing output.
+// FIXME(eddyb) maybe replace `Bridge::enter` with this?
+fn run_client<A: for<'a, 's> DecodeMut<'a, 's, ()>, R: Encode<()>>(
+ mut bridge: Bridge<'_>,
+ f: impl FnOnce(A) -> R,
+) -> Buffer<u8> {
+ // The initial `cached_buffer` contains the input.
+ let mut b = bridge.cached_buffer.take();
+
+ panic::catch_unwind(panic::AssertUnwindSafe(|| {
+ bridge.enter(|| {
+ let reader = &mut &b[..];
+ let input = A::decode(reader, &mut ());
+
+ // Put the `cached_buffer` back in the `Bridge`, for requests.
+ Bridge::with(|bridge| bridge.cached_buffer = b.take());
+
+ let output = f(input);
+
+ // Take the `cached_buffer` back out, for the output value.
+ b = Bridge::with(|bridge| bridge.cached_buffer.take());
+
+ // HACK(eddyb) Separate encoding a success value (`Ok(output)`)
+ // from encoding a panic (`Err(e: PanicMessage)`) to avoid
+ // having handles outside the `bridge.enter(|| ...)` scope, and
+ // to catch panics that could happen while encoding the success.
+ //
+ // Note that panics should be impossible beyond this point, but
+ // this is defensively trying to avoid any accidental panicking
+ // reaching the `extern "C"` (which should `abort` but may not
+ // at the moment, so this is also potentially preventing UB).
+ b.clear();
+ Ok::<_, ()>(output).encode(&mut b, &mut ());
+ })
+ }))
+ .map_err(PanicMessage::from)
+ .unwrap_or_else(|e| {
+ b.clear();
+ Err::<(), _>(e).encode(&mut b, &mut ());
+ });
+ b
+}
+
+impl Client<fn(crate::TokenStream) -> crate::TokenStream> {
+ pub fn expand1(f: fn(crate::TokenStream) -> crate::TokenStream) -> Self {
+ extern "C" fn run(
+ bridge: Bridge<'_>,
+ f: impl FnOnce(crate::TokenStream) -> crate::TokenStream,
+ ) -> Buffer<u8> {
+ run_client(bridge, |input| f(crate::TokenStream(input)).0)
+ }
+ Client { get_handle_counters: HandleCounters::get, run, f }
+ }
+}
+
+impl Client<fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream> {
+ pub fn expand2(f: fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream) -> Self {
+ extern "C" fn run(
+ bridge: Bridge<'_>,
+ f: impl FnOnce(crate::TokenStream, crate::TokenStream) -> crate::TokenStream,
+ ) -> Buffer<u8> {
+ run_client(bridge, |(input, input2)| {
+ f(crate::TokenStream(input), crate::TokenStream(input2)).0
+ })
+ }
+ Client { get_handle_counters: HandleCounters::get, run, f }
+ }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub enum ProcMacro {
+ CustomDerive {
+ trait_name: &'static str,
+ attributes: &'static [&'static str],
+ client: Client<fn(crate::TokenStream) -> crate::TokenStream>,
+ },
+
+ Attr {
+ name: &'static str,
+ client: Client<fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream>,
+ },
+
+ Bang {
+ name: &'static str,
+ client: Client<fn(crate::TokenStream) -> crate::TokenStream>,
+ },
+}
+
+impl std::fmt::Debug for ProcMacro {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "ProcMacro {{ name: {} }}", self.name())
+ }
+}
+
+impl ProcMacro {
+ pub fn name(&self) -> &'static str {
+ match self {
+ ProcMacro::CustomDerive { trait_name, .. } => trait_name,
+ ProcMacro::Attr { name, .. } => name,
+ ProcMacro::Bang { name, .. } => name,
+ }
+ }
+
+ pub fn custom_derive(
+ trait_name: &'static str,
+ attributes: &'static [&'static str],
+ expand: fn(crate::TokenStream) -> crate::TokenStream,
+ ) -> Self {
+ ProcMacro::CustomDerive { trait_name, attributes, client: Client::expand1(expand) }
+ }
+
+ pub fn attr(
+ name: &'static str,
+ expand: fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream,
+ ) -> Self {
+ ProcMacro::Attr { name, client: Client::expand2(expand) }
+ }
+
+ pub fn bang(name: &'static str, expand: fn(crate::TokenStream) -> crate::TokenStream) -> Self {
+ ProcMacro::Bang { name, client: Client::expand1(expand) }
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/closure.rs b/crates/proc_macro_srv/src/proc_macro/bridge/closure.rs
new file mode 100644
index 000000000..273a97715
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/closure.rs
@@ -0,0 +1,30 @@
+//! lib-proc-macro Closure type (equivalent to `&mut dyn FnMut(A) -> R`) that's `repr(C)`.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/closure.rs#
+//! augmented with removing unstable features
+
+#[repr(C)]
+pub struct Closure<'a, A, R> {
+ call: unsafe extern "C" fn(&mut Env, A) -> R,
+ env: &'a mut Env,
+}
+
+struct Env;
+
+// impl<'a, A, R> !Sync for Closure<'a, A, R> {}
+// impl<'a, A, R> !Send for Closure<'a, A, R> {}
+
+impl<'a, A, R, F: FnMut(A) -> R> From<&'a mut F> for Closure<'a, A, R> {
+ fn from(f: &'a mut F) -> Self {
+ unsafe extern "C" fn call<A, R, F: FnMut(A) -> R>(env: &mut Env, arg: A) -> R {
+ (*(env as *mut _ as *mut F))(arg)
+ }
+ Closure { call: call::<A, R, F>, env: unsafe { &mut *(f as *mut _ as *mut Env) } }
+ }
+}
+
+impl<'a, A, R> Closure<'a, A, R> {
+ pub fn call(&mut self, arg: A) -> R {
+ unsafe { (self.call)(self.env, arg) }
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/handle.rs b/crates/proc_macro_srv/src/proc_macro/bridge/handle.rs
new file mode 100644
index 000000000..a2f77b5ac
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/handle.rs
@@ -0,0 +1,73 @@
+//! lib-proc-macro Server-side handles and storage for per-handle data.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/handle.rs
+//! augmented with removing unstable features
+
+use std::collections::{BTreeMap, HashMap};
+use std::hash::Hash;
+use std::num::NonZeroU32;
+use std::ops::{Index, IndexMut};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+pub(super) type Handle = NonZeroU32;
+
+pub(super) struct OwnedStore<T: 'static> {
+ counter: &'static AtomicUsize,
+ data: BTreeMap<Handle, T>,
+}
+
+impl<T> OwnedStore<T> {
+ pub(super) fn new(counter: &'static AtomicUsize) -> Self {
+ // Ensure the handle counter isn't 0, which would panic later,
+ // when `NonZeroU32::new` (aka `Handle::new`) is called in `alloc`.
+ assert_ne!(counter.load(Ordering::SeqCst), 0);
+
+ OwnedStore { counter, data: BTreeMap::new() }
+ }
+}
+
+impl<T> OwnedStore<T> {
+ pub(super) fn alloc(&mut self, x: T) -> Handle {
+ let counter = self.counter.fetch_add(1, Ordering::SeqCst);
+ let handle = Handle::new(counter as u32).expect("`proc_macro` handle counter overflowed");
+ assert!(self.data.insert(handle, x).is_none());
+ handle
+ }
+
+ pub(super) fn take(&mut self, h: Handle) -> T {
+ self.data.remove(&h).expect("use-after-free in `proc_macro` handle")
+ }
+}
+
+impl<T> Index<Handle> for OwnedStore<T> {
+ type Output = T;
+ fn index(&self, h: Handle) -> &T {
+ self.data.get(&h).expect("use-after-free in `proc_macro` handle")
+ }
+}
+
+impl<T> IndexMut<Handle> for OwnedStore<T> {
+ fn index_mut(&mut self, h: Handle) -> &mut T {
+ self.data.get_mut(&h).expect("use-after-free in `proc_macro` handle")
+ }
+}
+
+pub(super) struct InternedStore<T: 'static> {
+ owned: OwnedStore<T>,
+ interner: HashMap<T, Handle>,
+}
+
+impl<T: Copy + Eq + Hash> InternedStore<T> {
+ pub(super) fn new(counter: &'static AtomicUsize) -> Self {
+ InternedStore { owned: OwnedStore::new(counter), interner: HashMap::new() }
+ }
+
+ pub(super) fn alloc(&mut self, x: T) -> Handle {
+ let owned = &mut self.owned;
+ *self.interner.entry(x).or_insert_with(|| owned.alloc(x))
+ }
+
+ pub(super) fn copy(&mut self, h: Handle) -> T {
+ self.owned[h]
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/mod.rs b/crates/proc_macro_srv/src/proc_macro/bridge/mod.rs
new file mode 100644
index 000000000..aeb05aad4
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/mod.rs
@@ -0,0 +1,408 @@
+//! lib-proc-macro Internal interface for communicating between a `proc_macro` client
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/mod.rs
+//! augmented with removing unstable features
+//!
+//! Internal interface for communicating between a `proc_macro` client
+//! (a proc macro crate) and a `proc_macro` server (a compiler front-end).
+//!
+//! Serialization (with C ABI buffers) and unique integer handles are employed
+//! to allow safely interfacing between two copies of `proc_macro` built
+//! (from the same source) by different compilers with potentially mismatching
+//! Rust ABIs (e.g., stage0/bin/rustc vs stage1/bin/rustc during bootstrap).
+
+#![deny(unsafe_code)]
+
+pub use crate::proc_macro::{Delimiter, Level, LineColumn, Spacing};
+use std::fmt;
+use std::hash::Hash;
+use std::marker;
+use std::mem;
+use std::ops::Bound;
+use std::panic;
+use std::sync::atomic::AtomicUsize;
+use std::sync::Once;
+use std::thread;
+
+/// Higher-order macro describing the server RPC API, allowing automatic
+/// generation of type-safe Rust APIs, both client-side and server-side.
+///
+/// `with_api!(MySelf, my_self, my_macro)` expands to:
+/// ```rust,ignore (pseudo-code)
+/// my_macro! {
+/// // ...
+/// Literal {
+/// // ...
+/// fn character(ch: char) -> MySelf::Literal;
+/// // ...
+/// fn span(my_self: &MySelf::Literal) -> MySelf::Span;
+/// fn set_span(my_self: &mut MySelf::Literal, span: MySelf::Span);
+/// },
+/// // ...
+/// }
+/// ```
+///
+/// The first two arguments serve to customize the arguments names
+/// and argument/return types, to enable several different usecases:
+///
+/// If `my_self` is just `self`, then each `fn` signature can be used
+/// as-is for a method. If it's anything else (`self_` in practice),
+/// then the signatures don't have a special `self` argument, and
+/// can, therefore, have a different one introduced.
+///
+/// If `MySelf` is just `Self`, then the types are only valid inside
+/// a trait or a trait impl, where the trait has associated types
+/// for each of the API types. If non-associated types are desired,
+/// a module name (`self` in practice) can be used instead of `Self`.
+macro_rules! with_api {
+ ($S:ident, $self:ident, $m:ident) => {
+ $m! {
+ TokenStream {
+ fn drop($self: $S::TokenStream);
+ fn clone($self: &$S::TokenStream) -> $S::TokenStream;
+ fn new() -> $S::TokenStream;
+ fn is_empty($self: &$S::TokenStream) -> bool;
+ fn from_str(src: &str) -> $S::TokenStream;
+ fn to_string($self: &$S::TokenStream) -> String;
+ fn from_token_tree(
+ tree: TokenTree<$S::Group, $S::Punct, $S::Ident, $S::Literal>,
+ ) -> $S::TokenStream;
+ fn into_iter($self: $S::TokenStream) -> $S::TokenStreamIter;
+ },
+ TokenStreamBuilder {
+ fn drop($self: $S::TokenStreamBuilder);
+ fn new() -> $S::TokenStreamBuilder;
+ fn push($self: &mut $S::TokenStreamBuilder, stream: $S::TokenStream);
+ fn build($self: $S::TokenStreamBuilder) -> $S::TokenStream;
+ },
+ TokenStreamIter {
+ fn drop($self: $S::TokenStreamIter);
+ fn clone($self: &$S::TokenStreamIter) -> $S::TokenStreamIter;
+ fn next(
+ $self: &mut $S::TokenStreamIter,
+ ) -> Option<TokenTree<$S::Group, $S::Punct, $S::Ident, $S::Literal>>;
+ },
+ Group {
+ fn drop($self: $S::Group);
+ fn clone($self: &$S::Group) -> $S::Group;
+ fn new(delimiter: Delimiter, stream: $S::TokenStream) -> $S::Group;
+ fn delimiter($self: &$S::Group) -> Delimiter;
+ fn stream($self: &$S::Group) -> $S::TokenStream;
+ fn span($self: &$S::Group) -> $S::Span;
+ fn span_open($self: &$S::Group) -> $S::Span;
+ fn span_close($self: &$S::Group) -> $S::Span;
+ fn set_span($self: &mut $S::Group, span: $S::Span);
+ },
+ Punct {
+ fn new(ch: char, spacing: Spacing) -> $S::Punct;
+ fn as_char($self: $S::Punct) -> char;
+ fn spacing($self: $S::Punct) -> Spacing;
+ fn span($self: $S::Punct) -> $S::Span;
+ fn with_span($self: $S::Punct, span: $S::Span) -> $S::Punct;
+ },
+ Ident {
+ fn new(string: &str, span: $S::Span, is_raw: bool) -> $S::Ident;
+ fn span($self: $S::Ident) -> $S::Span;
+ fn with_span($self: $S::Ident, span: $S::Span) -> $S::Ident;
+ },
+ Literal {
+ fn drop($self: $S::Literal);
+ fn clone($self: &$S::Literal) -> $S::Literal;
+ fn debug_kind($self: &$S::Literal) -> String;
+ fn symbol($self: &$S::Literal) -> String;
+ fn suffix($self: &$S::Literal) -> Option<String>;
+ fn integer(n: &str) -> $S::Literal;
+ fn typed_integer(n: &str, kind: &str) -> $S::Literal;
+ fn float(n: &str) -> $S::Literal;
+ fn f32(n: &str) -> $S::Literal;
+ fn f64(n: &str) -> $S::Literal;
+ fn string(string: &str) -> $S::Literal;
+ fn character(ch: char) -> $S::Literal;
+ fn byte_string(bytes: &[u8]) -> $S::Literal;
+ fn span($self: &$S::Literal) -> $S::Span;
+ fn set_span($self: &mut $S::Literal, span: $S::Span);
+ fn subspan(
+ $self: &$S::Literal,
+ start: Bound<usize>,
+ end: Bound<usize>,
+ ) -> Option<$S::Span>;
+ },
+ SourceFile {
+ fn drop($self: $S::SourceFile);
+ fn clone($self: &$S::SourceFile) -> $S::SourceFile;
+ fn eq($self: &$S::SourceFile, other: &$S::SourceFile) -> bool;
+ fn path($self: &$S::SourceFile) -> String;
+ fn is_real($self: &$S::SourceFile) -> bool;
+ },
+ MultiSpan {
+ fn drop($self: $S::MultiSpan);
+ fn new() -> $S::MultiSpan;
+ fn push($self: &mut $S::MultiSpan, span: $S::Span);
+ },
+ Diagnostic {
+ fn drop($self: $S::Diagnostic);
+ fn new(level: Level, msg: &str, span: $S::MultiSpan) -> $S::Diagnostic;
+ fn sub(
+ $self: &mut $S::Diagnostic,
+ level: Level,
+ msg: &str,
+ span: $S::MultiSpan,
+ );
+ fn emit($self: $S::Diagnostic);
+ },
+ Span {
+ fn debug($self: $S::Span) -> String;
+ fn def_site() -> $S::Span;
+ fn call_site() -> $S::Span;
+ fn mixed_site() -> $S::Span;
+ fn source_file($self: $S::Span) -> $S::SourceFile;
+ fn parent($self: $S::Span) -> Option<$S::Span>;
+ fn source($self: $S::Span) -> $S::Span;
+ fn start($self: $S::Span) -> LineColumn;
+ fn end($self: $S::Span) -> LineColumn;
+ fn join($self: $S::Span, other: $S::Span) -> Option<$S::Span>;
+ fn resolved_at($self: $S::Span, at: $S::Span) -> $S::Span;
+ fn source_text($self: $S::Span) -> Option<String>;
+ },
+ }
+ };
+}
+
+// FIXME(eddyb) this calls `encode` for each argument, but in reverse,
+// to avoid borrow conflicts from borrows started by `&mut` arguments.
+macro_rules! reverse_encode {
+ ($writer:ident;) => {};
+ ($writer:ident; $first:ident $(, $rest:ident)*) => {
+ reverse_encode!($writer; $($rest),*);
+ $first.encode(&mut $writer, &mut ());
+ }
+}
+
+// FIXME(eddyb) this calls `decode` for each argument, but in reverse,
+// to avoid borrow conflicts from borrows started by `&mut` arguments.
+macro_rules! reverse_decode {
+ ($reader:ident, $s:ident;) => {};
+ ($reader:ident, $s:ident; $first:ident: $first_ty:ty $(, $rest:ident: $rest_ty:ty)*) => {
+ reverse_decode!($reader, $s; $($rest: $rest_ty),*);
+ let $first = <$first_ty>::decode(&mut $reader, $s);
+ }
+}
+
+#[allow(unsafe_code)]
+mod buffer;
+#[forbid(unsafe_code)]
+pub mod client;
+#[allow(unsafe_code)]
+mod closure;
+#[forbid(unsafe_code)]
+mod handle;
+#[macro_use]
+#[forbid(unsafe_code)]
+mod rpc;
+#[allow(unsafe_code)]
+mod scoped_cell;
+#[forbid(unsafe_code)]
+pub mod server;
+
+use buffer::Buffer;
+pub use rpc::PanicMessage;
+use rpc::{Decode, DecodeMut, Encode, Reader, Writer};
+
+/// An active connection between a server and a client.
+/// The server creates the bridge (`Bridge::run_server` in `server.rs`),
+/// then passes it to the client through the function pointer in the `run`
+/// field of `client::Client`. The client holds its copy of the `Bridge`
+/// in TLS during its execution (`Bridge::{enter, with}` in `client.rs`).
+#[repr(C)]
+pub struct Bridge<'a> {
+ /// Reusable buffer (only `clear`-ed, never shrunk), primarily
+ /// used for making requests, but also for passing input to client.
+ cached_buffer: Buffer<u8>,
+
+ /// Server-side function that the client uses to make requests.
+ dispatch: closure::Closure<'a, Buffer<u8>, Buffer<u8>>,
+}
+
+// impl<'a> !Sync for Bridge<'a> {}
+// impl<'a> !Send for Bridge<'a> {}
+
+#[forbid(unsafe_code)]
+#[allow(non_camel_case_types)]
+mod api_tags {
+ use super::rpc::{DecodeMut, Encode, Reader, Writer};
+
+ macro_rules! declare_tags {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)*;)*
+ }),* $(,)?) => {
+ $(
+ pub(super) enum $name {
+ $($method),*
+ }
+ rpc_encode_decode!(enum $name { $($method),* });
+ )*
+
+
+ pub(super) enum Method {
+ $($name($name)),*
+ }
+ rpc_encode_decode!(enum Method { $($name(m)),* });
+ }
+ }
+ with_api!(self, self, declare_tags);
+}
+
+/// Helper to wrap associated types to allow trait impl dispatch.
+/// That is, normally a pair of impls for `T::Foo` and `T::Bar`
+/// can overlap, but if the impls are, instead, on types like
+/// `Marked<T::Foo, Foo>` and `Marked<T::Bar, Bar>`, they can't.
+trait Mark {
+ type Unmarked;
+ fn mark(unmarked: Self::Unmarked) -> Self;
+}
+
+/// Unwrap types wrapped by `Mark::mark` (see `Mark` for details).
+trait Unmark {
+ type Unmarked;
+ fn unmark(self) -> Self::Unmarked;
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+struct Marked<T, M> {
+ value: T,
+ _marker: marker::PhantomData<M>,
+}
+
+impl<T, M> Mark for Marked<T, M> {
+ type Unmarked = T;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ Marked { value: unmarked, _marker: marker::PhantomData }
+ }
+}
+impl<T, M> Unmark for Marked<T, M> {
+ type Unmarked = T;
+ fn unmark(self) -> Self::Unmarked {
+ self.value
+ }
+}
+impl<'a, T, M> Unmark for &'a Marked<T, M> {
+ type Unmarked = &'a T;
+ fn unmark(self) -> Self::Unmarked {
+ &self.value
+ }
+}
+impl<'a, T, M> Unmark for &'a mut Marked<T, M> {
+ type Unmarked = &'a mut T;
+ fn unmark(self) -> Self::Unmarked {
+ &mut self.value
+ }
+}
+
+impl<T: Mark> Mark for Option<T> {
+ type Unmarked = Option<T::Unmarked>;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ unmarked.map(T::mark)
+ }
+}
+impl<T: Unmark> Unmark for Option<T> {
+ type Unmarked = Option<T::Unmarked>;
+ fn unmark(self) -> Self::Unmarked {
+ self.map(T::unmark)
+ }
+}
+
+macro_rules! mark_noop {
+ ($($ty:ty),* $(,)?) => {
+ $(
+ impl Mark for $ty {
+ type Unmarked = Self;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ unmarked
+ }
+ }
+ impl Unmark for $ty {
+ type Unmarked = Self;
+ fn unmark(self) -> Self::Unmarked {
+ self
+ }
+ }
+ )*
+ }
+}
+mark_noop! {
+ (),
+ bool,
+ char,
+ &'_ [u8],
+ &'_ str,
+ String,
+ Delimiter,
+ Level,
+ LineColumn,
+ Spacing,
+ Bound<usize>,
+}
+
+rpc_encode_decode!(
+ enum Delimiter {
+ Parenthesis,
+ Brace,
+ Bracket,
+ None,
+ }
+);
+rpc_encode_decode!(
+ enum Level {
+ Error,
+ Warning,
+ Note,
+ Help,
+ }
+);
+rpc_encode_decode!(struct LineColumn { line, column });
+rpc_encode_decode!(
+ enum Spacing {
+ Alone,
+ Joint,
+ }
+);
+
+#[derive(Clone)]
+pub enum TokenTree<G, P, I, L> {
+ Group(G),
+ Punct(P),
+ Ident(I),
+ Literal(L),
+}
+
+impl<G: Mark, P: Mark, I: Mark, L: Mark> Mark for TokenTree<G, P, I, L> {
+ type Unmarked = TokenTree<G::Unmarked, P::Unmarked, I::Unmarked, L::Unmarked>;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ match unmarked {
+ TokenTree::Group(tt) => TokenTree::Group(G::mark(tt)),
+ TokenTree::Punct(tt) => TokenTree::Punct(P::mark(tt)),
+ TokenTree::Ident(tt) => TokenTree::Ident(I::mark(tt)),
+ TokenTree::Literal(tt) => TokenTree::Literal(L::mark(tt)),
+ }
+ }
+}
+impl<G: Unmark, P: Unmark, I: Unmark, L: Unmark> Unmark for TokenTree<G, P, I, L> {
+ type Unmarked = TokenTree<G::Unmarked, P::Unmarked, I::Unmarked, L::Unmarked>;
+ fn unmark(self) -> Self::Unmarked {
+ match self {
+ TokenTree::Group(tt) => TokenTree::Group(tt.unmark()),
+ TokenTree::Punct(tt) => TokenTree::Punct(tt.unmark()),
+ TokenTree::Ident(tt) => TokenTree::Ident(tt.unmark()),
+ TokenTree::Literal(tt) => TokenTree::Literal(tt.unmark()),
+ }
+ }
+}
+
+rpc_encode_decode!(
+ enum TokenTree<G, P, I, L> {
+ Group(tt),
+ Punct(tt),
+ Ident(tt),
+ Literal(tt),
+ }
+);
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/rpc.rs b/crates/proc_macro_srv/src/proc_macro/bridge/rpc.rs
new file mode 100644
index 000000000..3528d5c99
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/rpc.rs
@@ -0,0 +1,311 @@
+//! lib-proc-macro Serialization for client-server communication.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/rpc.rs
+//! augmented with removing unstable features
+//!
+//! Serialization for client-server communication.
+
+use std::any::Any;
+use std::char;
+use std::io::Write;
+use std::num::NonZeroU32;
+use std::ops::Bound;
+use std::str;
+
+pub(super) type Writer = super::buffer::Buffer<u8>;
+
+pub(super) trait Encode<S>: Sized {
+ fn encode(self, w: &mut Writer, s: &mut S);
+}
+
+pub(super) type Reader<'a> = &'a [u8];
+
+pub(super) trait Decode<'a, 's, S>: Sized {
+ fn decode(r: &mut Reader<'a>, s: &'s S) -> Self;
+}
+
+pub(super) trait DecodeMut<'a, 's, S>: Sized {
+ fn decode(r: &mut Reader<'a>, s: &'s mut S) -> Self;
+}
+
+macro_rules! rpc_encode_decode {
+ (le $ty:ty) => {
+ impl<S> Encode<S> for $ty {
+ fn encode(self, w: &mut Writer, _: &mut S) {
+ w.write_all(&self.to_le_bytes()).unwrap();
+ }
+ }
+
+ impl<S> DecodeMut<'_, '_, S> for $ty {
+ fn decode(r: &mut Reader<'_>, _: &mut S) -> Self {
+ const N: usize = ::std::mem::size_of::<$ty>();
+
+ let mut bytes = [0; N];
+ bytes.copy_from_slice(&r[..N]);
+ *r = &r[N..];
+
+ Self::from_le_bytes(bytes)
+ }
+ }
+ };
+ (struct $name:ident { $($field:ident),* $(,)? }) => {
+ impl<S> Encode<S> for $name {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ $(self.$field.encode(w, s);)*
+ }
+ }
+
+ impl<S> DecodeMut<'_, '_, S> for $name {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ $name {
+ $($field: DecodeMut::decode(r, s)),*
+ }
+ }
+ }
+ };
+ (enum $name:ident $(<$($T:ident),+>)? { $($variant:ident $(($field:ident))*),* $(,)? }) => {
+ impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)? {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ // HACK(eddyb): `Tag` enum duplicated between the
+ // two impls as there's no other place to stash it.
+ #[allow(non_upper_case_globals)]
+ mod tag {
+ #[repr(u8)] enum Tag { $($variant),* }
+
+ $(pub const $variant: u8 = Tag::$variant as u8;)*
+ }
+
+ match self {
+ $($name::$variant $(($field))* => {
+ tag::$variant.encode(w, s);
+ $($field.encode(w, s);)*
+ })*
+ }
+ }
+ }
+
+ impl<'a, S, $($($T: for<'s> DecodeMut<'a, 's, S>),+)?> DecodeMut<'a, '_, S>
+ for $name $(<$($T),+>)?
+ {
+ fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
+ // HACK(eddyb): `Tag` enum duplicated between the
+ // two impls as there's no other place to stash it.
+ #[allow(non_upper_case_globals)]
+ mod tag {
+ #[repr(u8)] enum Tag { $($variant),* }
+
+ $(pub const $variant: u8 = Tag::$variant as u8;)*
+ }
+
+ match u8::decode(r, s) {
+ $(tag::$variant => {
+ $(let $field = DecodeMut::decode(r, s);)*
+ $name::$variant $(($field))*
+ })*
+ _ => unreachable!(),
+ }
+ }
+ }
+ }
+}
+
+impl<S> Encode<S> for () {
+ fn encode(self, _: &mut Writer, _: &mut S) {}
+}
+
+impl<S> DecodeMut<'_, '_, S> for () {
+ fn decode(_: &mut Reader<'_>, _: &mut S) -> Self {}
+}
+
+impl<S> Encode<S> for u8 {
+ fn encode(self, w: &mut Writer, _: &mut S) {
+ w.write_all(&[self]).unwrap();
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for u8 {
+ fn decode(r: &mut Reader<'_>, _: &mut S) -> Self {
+ let x = r[0];
+ *r = &r[1..];
+ x
+ }
+}
+
+rpc_encode_decode!(le u32);
+rpc_encode_decode!(le usize);
+
+impl<S> Encode<S> for bool {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ (self as u8).encode(w, s);
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for bool {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ match u8::decode(r, s) {
+ 0 => false,
+ 1 => true,
+ _ => unreachable!(),
+ }
+ }
+}
+
+impl<S> Encode<S> for char {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ (self as u32).encode(w, s);
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for char {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ char::from_u32(u32::decode(r, s)).unwrap()
+ }
+}
+
+impl<S> Encode<S> for NonZeroU32 {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.get().encode(w, s);
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for NonZeroU32 {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ Self::new(u32::decode(r, s)).unwrap()
+ }
+}
+
+impl<S, A: Encode<S>, B: Encode<S>> Encode<S> for (A, B) {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.0.encode(w, s);
+ self.1.encode(w, s);
+ }
+}
+
+impl<'a, S, A: for<'s> DecodeMut<'a, 's, S>, B: for<'s> DecodeMut<'a, 's, S>> DecodeMut<'a, '_, S>
+ for (A, B)
+{
+ fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
+ (DecodeMut::decode(r, s), DecodeMut::decode(r, s))
+ }
+}
+
+rpc_encode_decode!(
+ enum Bound<T> {
+ Included(x),
+ Excluded(x),
+ Unbounded,
+ }
+);
+
+rpc_encode_decode!(
+ enum Option<T> {
+ None,
+ Some(x),
+ }
+);
+
+rpc_encode_decode!(
+ enum Result<T, E> {
+ Ok(x),
+ Err(e),
+ }
+);
+
+impl<S> Encode<S> for &[u8] {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.len().encode(w, s);
+ w.write_all(self).unwrap();
+ }
+}
+
+impl<'a, S> DecodeMut<'a, '_, S> for &'a [u8] {
+ fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
+ let len = usize::decode(r, s);
+ let xs = &r[..len];
+ *r = &r[len..];
+ xs
+ }
+}
+
+impl<S> Encode<S> for &str {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.as_bytes().encode(w, s);
+ }
+}
+
+impl<'a, S> DecodeMut<'a, '_, S> for &'a str {
+ fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
+ str::from_utf8(<&[u8]>::decode(r, s)).unwrap()
+ }
+}
+
+impl<S> Encode<S> for String {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self[..].encode(w, s);
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for String {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ <&str>::decode(r, s).to_string()
+ }
+}
+
+/// Simplied version of panic payloads, ignoring
+/// types other than `&'static str` and `String`.
+#[derive(Debug)]
+pub enum PanicMessage {
+ StaticStr(&'static str),
+ String(String),
+ Unknown,
+}
+
+impl From<Box<dyn Any + Send>> for PanicMessage {
+ fn from(payload: Box<dyn Any + Send + 'static>) -> Self {
+ if let Some(s) = payload.downcast_ref::<&'static str>() {
+ return PanicMessage::StaticStr(s);
+ }
+ if let Ok(s) = payload.downcast::<String>() {
+ return PanicMessage::String(*s);
+ }
+ PanicMessage::Unknown
+ }
+}
+
+impl Into<Box<dyn Any + Send>> for PanicMessage {
+ fn into(self) -> Box<dyn Any + Send> {
+ match self {
+ PanicMessage::StaticStr(s) => Box::new(s),
+ PanicMessage::String(s) => Box::new(s),
+ PanicMessage::Unknown => {
+ struct UnknownPanicMessage;
+ Box::new(UnknownPanicMessage)
+ }
+ }
+ }
+}
+
+impl PanicMessage {
+ pub fn as_str(&self) -> Option<&str> {
+ match self {
+ PanicMessage::StaticStr(s) => Some(s),
+ PanicMessage::String(s) => Some(s),
+ PanicMessage::Unknown => None,
+ }
+ }
+}
+
+impl<S> Encode<S> for PanicMessage {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.as_str().encode(w, s);
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for PanicMessage {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ match Option::<String>::decode(r, s) {
+ Some(s) => PanicMessage::String(s),
+ None => PanicMessage::Unknown,
+ }
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/scoped_cell.rs b/crates/proc_macro_srv/src/proc_macro/bridge/scoped_cell.rs
new file mode 100644
index 000000000..6ef7ea43c
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/scoped_cell.rs
@@ -0,0 +1,84 @@
+//! lib-proc-macro `Cell` variant for (scoped) existential lifetimes.
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/scoped_cell.rs#L1
+//! augmented with removing unstable features
+
+use std::cell::Cell;
+use std::mem;
+use std::ops::{Deref, DerefMut};
+
+/// Type lambda application, with a lifetime.
+#[allow(unused_lifetimes)]
+pub trait ApplyL<'a> {
+ type Out;
+}
+
+/// Type lambda taking a lifetime, i.e., `Lifetime -> Type`.
+pub trait LambdaL: for<'a> ApplyL<'a> {}
+
+impl<T: for<'a> ApplyL<'a>> LambdaL for T {}
+
+// HACK(eddyb) work around projection limitations with a newtype
+// FIXME(#52812) replace with `&'a mut <T as ApplyL<'b>>::Out`
+pub struct RefMutL<'a, 'b, T: LambdaL>(&'a mut <T as ApplyL<'b>>::Out);
+
+impl<'a, 'b, T: LambdaL> Deref for RefMutL<'a, 'b, T> {
+ type Target = <T as ApplyL<'b>>::Out;
+ fn deref(&self) -> &Self::Target {
+ self.0
+ }
+}
+
+impl<'a, 'b, T: LambdaL> DerefMut for RefMutL<'a, 'b, T> {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ self.0
+ }
+}
+
+pub struct ScopedCell<T: LambdaL>(Cell<<T as ApplyL<'static>>::Out>);
+
+impl<T: LambdaL> ScopedCell<T> {
+ pub fn new(value: <T as ApplyL<'static>>::Out) -> Self {
+ ScopedCell(Cell::new(value))
+ }
+
+ /// Sets the value in `self` to `replacement` while
+ /// running `f`, which gets the old value, mutably.
+ /// The old value will be restored after `f` exits, even
+ /// by panic, including modifications made to it by `f`.
+ pub fn replace<'a, R>(
+ &self,
+ replacement: <T as ApplyL<'a>>::Out,
+ f: impl for<'b, 'c> FnOnce(RefMutL<'b, 'c, T>) -> R,
+ ) -> R {
+ /// Wrapper that ensures that the cell always gets filled
+ /// (with the original state, optionally changed by `f`),
+ /// even if `f` had panicked.
+ struct PutBackOnDrop<'a, T: LambdaL> {
+ cell: &'a ScopedCell<T>,
+ value: Option<<T as ApplyL<'static>>::Out>,
+ }
+
+ impl<'a, T: LambdaL> Drop for PutBackOnDrop<'a, T> {
+ fn drop(&mut self) {
+ self.cell.0.set(self.value.take().unwrap());
+ }
+ }
+
+ let mut put_back_on_drop = PutBackOnDrop {
+ cell: self,
+ value: Some(self.0.replace(unsafe {
+ let erased = mem::transmute_copy(&replacement);
+ mem::forget(replacement);
+ erased
+ })),
+ };
+
+ f(RefMutL(put_back_on_drop.value.as_mut().unwrap()))
+ }
+
+ /// Sets the value in `self` to `value` while running `f`.
+ pub fn set<R>(&self, value: <T as ApplyL<'_>>::Out, f: impl FnOnce() -> R) -> R {
+ self.replace(value, |_| f())
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/bridge/server.rs b/crates/proc_macro_srv/src/proc_macro/bridge/server.rs
new file mode 100644
index 000000000..45d41ac02
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/bridge/server.rs
@@ -0,0 +1,323 @@
+//! lib-proc-macro server-side traits
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/server.rs
+//! augmented with removing unstable features
+
+use super::*;
+
+// FIXME(eddyb) generate the definition of `HandleStore` in `server.rs`.
+use super::client::HandleStore;
+
+/// Declare an associated item of one of the traits below, optionally
+/// adjusting it (i.e., adding bounds to types and default bodies to methods).
+macro_rules! associated_item {
+ (type TokenStream) =>
+ (type TokenStream: 'static + Clone;);
+ (type TokenStreamBuilder) =>
+ (type TokenStreamBuilder: 'static;);
+ (type TokenStreamIter) =>
+ (type TokenStreamIter: 'static + Clone;);
+ (type Group) =>
+ (type Group: 'static + Clone;);
+ (type Punct) =>
+ (type Punct: 'static + Copy + Eq + Hash;);
+ (type Ident) =>
+ (type Ident: 'static + Copy + Eq + Hash;);
+ (type Literal) =>
+ (type Literal: 'static + Clone;);
+ (type SourceFile) =>
+ (type SourceFile: 'static + Clone;);
+ (type MultiSpan) =>
+ (type MultiSpan: 'static;);
+ (type Diagnostic) =>
+ (type Diagnostic: 'static;);
+ (type Span) =>
+ (type Span: 'static + Copy + Eq + Hash;);
+ (fn drop(&mut self, $arg:ident: $arg_ty:ty)) =>
+ (fn drop(&mut self, $arg: $arg_ty) { mem::drop($arg) });
+ (fn clone(&mut self, $arg:ident: $arg_ty:ty) -> $ret_ty:ty) =>
+ (fn clone(&mut self, $arg: $arg_ty) -> $ret_ty { $arg.clone() });
+ ($($item:tt)*) => ($($item)*;)
+}
+
+macro_rules! declare_server_traits {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
+ }),* $(,)?) => {
+ pub trait Types {
+ $(associated_item!(type $name);)*
+ }
+
+ $(pub trait $name: Types {
+ $(associated_item!(fn $method(&mut self, $($arg: $arg_ty),*) $(-> $ret_ty)?);)*
+ })*
+
+ pub trait Server: Types $(+ $name)* {}
+ impl<S: Types $(+ $name)*> Server for S {}
+ }
+}
+with_api!(Self, self_, declare_server_traits);
+
+pub(super) struct MarkedTypes<S: Types>(S);
+
+macro_rules! define_mark_types_impls {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
+ }),* $(,)?) => {
+ impl<S: Types> Types for MarkedTypes<S> {
+ $(type $name = Marked<S::$name, client::$name>;)*
+ }
+
+ $(impl<S: $name> $name for MarkedTypes<S> {
+ $(fn $method(&mut self, $($arg: $arg_ty),*) $(-> $ret_ty)? {
+ <_>::mark($name::$method(&mut self.0, $($arg.unmark()),*))
+ })*
+ })*
+ }
+}
+with_api!(Self, self_, define_mark_types_impls);
+
+struct Dispatcher<S: Types> {
+ handle_store: HandleStore<S>,
+ server: S,
+}
+
+macro_rules! define_dispatcher_impl {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
+ }),* $(,)?) => {
+ // FIXME(eddyb) `pub` only for `ExecutionStrategy` below.
+ pub trait DispatcherTrait {
+ // HACK(eddyb) these are here to allow `Self::$name` to work below.
+ $(type $name;)*
+ fn dispatch(&mut self, b: Buffer<u8>) -> Buffer<u8>;
+ }
+
+ impl<S: Server> DispatcherTrait for Dispatcher<MarkedTypes<S>> {
+ $(type $name = <MarkedTypes<S> as Types>::$name;)*
+ fn dispatch(&mut self, mut b: Buffer<u8>) -> Buffer<u8> {
+ let Dispatcher { handle_store, server } = self;
+
+ let mut reader = &b[..];
+ match api_tags::Method::decode(&mut reader, &mut ()) {
+ $(api_tags::Method::$name(m) => match m {
+ $(api_tags::$name::$method => {
+ let mut call_method = || {
+ reverse_decode!(reader, handle_store; $($arg: $arg_ty),*);
+ $name::$method(server, $($arg),*)
+ };
+ // HACK(eddyb) don't use `panic::catch_unwind` in a panic.
+ // If client and server happen to use the same `libstd`,
+ // `catch_unwind` asserts that the panic counter was 0,
+ // even when the closure passed to it didn't panic.
+ let r = if thread::panicking() {
+ Ok(call_method())
+ } else {
+ panic::catch_unwind(panic::AssertUnwindSafe(call_method))
+ .map_err(PanicMessage::from)
+ };
+
+ b.clear();
+ r.encode(&mut b, handle_store);
+ })*
+ }),*
+ }
+ b
+ }
+ }
+ }
+}
+with_api!(Self, self_, define_dispatcher_impl);
+
+pub trait ExecutionStrategy {
+ fn run_bridge_and_client<D: Copy + Send + 'static>(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer<u8>,
+ run_client: extern "C" fn(Bridge<'_>, D) -> Buffer<u8>,
+ client_data: D,
+ ) -> Buffer<u8>;
+}
+
+pub struct SameThread;
+
+impl ExecutionStrategy for SameThread {
+ fn run_bridge_and_client<D: Copy + Send + 'static>(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer<u8>,
+ run_client: extern "C" fn(Bridge<'_>, D) -> Buffer<u8>,
+ client_data: D,
+ ) -> Buffer<u8> {
+ let mut dispatch = |b| dispatcher.dispatch(b);
+
+ run_client(Bridge { cached_buffer: input, dispatch: (&mut dispatch).into() }, client_data)
+ }
+}
+
+// NOTE(eddyb) Two implementations are provided, the second one is a bit
+// faster but neither is anywhere near as fast as same-thread execution.
+
+pub struct CrossThread1;
+
+impl ExecutionStrategy for CrossThread1 {
+ fn run_bridge_and_client<D: Copy + Send + 'static>(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer<u8>,
+ run_client: extern "C" fn(Bridge<'_>, D) -> Buffer<u8>,
+ client_data: D,
+ ) -> Buffer<u8> {
+ use std::sync::mpsc::channel;
+
+ let (req_tx, req_rx) = channel();
+ let (res_tx, res_rx) = channel();
+
+ let join_handle = thread::spawn(move || {
+ let mut dispatch = |b| {
+ req_tx.send(b).unwrap();
+ res_rx.recv().unwrap()
+ };
+
+ run_client(
+ Bridge { cached_buffer: input, dispatch: (&mut dispatch).into() },
+ client_data,
+ )
+ });
+
+ for b in req_rx {
+ res_tx.send(dispatcher.dispatch(b)).unwrap();
+ }
+
+ join_handle.join().unwrap()
+ }
+}
+
+pub struct CrossThread2;
+
+impl ExecutionStrategy for CrossThread2 {
+ fn run_bridge_and_client<D: Copy + Send + 'static>(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer<u8>,
+ run_client: extern "C" fn(Bridge<'_>, D) -> Buffer<u8>,
+ client_data: D,
+ ) -> Buffer<u8> {
+ use std::sync::{Arc, Mutex};
+
+ enum State<T> {
+ Req(T),
+ Res(T),
+ }
+
+ let mut state = Arc::new(Mutex::new(State::Res(Buffer::new())));
+
+ let server_thread = thread::current();
+ let state2 = state.clone();
+ let join_handle = thread::spawn(move || {
+ let mut dispatch = |b| {
+ *state2.lock().unwrap() = State::Req(b);
+ server_thread.unpark();
+ loop {
+ thread::park();
+ if let State::Res(b) = &mut *state2.lock().unwrap() {
+ break b.take();
+ }
+ }
+ };
+
+ let r = run_client(
+ Bridge { cached_buffer: input, dispatch: (&mut dispatch).into() },
+ client_data,
+ );
+
+ // Wake up the server so it can exit the dispatch loop.
+ drop(state2);
+ server_thread.unpark();
+
+ r
+ });
+
+ // Check whether `state2` was dropped, to know when to stop.
+ while Arc::get_mut(&mut state).is_none() {
+ thread::park();
+ let mut b = match &mut *state.lock().unwrap() {
+ State::Req(b) => b.take(),
+ _ => continue,
+ };
+ b = dispatcher.dispatch(b.take());
+ *state.lock().unwrap() = State::Res(b);
+ join_handle.thread().unpark();
+ }
+
+ join_handle.join().unwrap()
+ }
+}
+
+fn run_server<
+ S: Server,
+ I: Encode<HandleStore<MarkedTypes<S>>>,
+ O: for<'a, 's> DecodeMut<'a, 's, HandleStore<MarkedTypes<S>>>,
+ D: Copy + Send + 'static,
+>(
+ strategy: &impl ExecutionStrategy,
+ handle_counters: &'static client::HandleCounters,
+ server: S,
+ input: I,
+ run_client: extern "C" fn(Bridge<'_>, D) -> Buffer<u8>,
+ client_data: D,
+) -> Result<O, PanicMessage> {
+ let mut dispatcher =
+ Dispatcher { handle_store: HandleStore::new(handle_counters), server: MarkedTypes(server) };
+
+ let mut b = Buffer::new();
+ input.encode(&mut b, &mut dispatcher.handle_store);
+
+ b = strategy.run_bridge_and_client(&mut dispatcher, b, run_client, client_data);
+
+ Result::decode(&mut &b[..], &mut dispatcher.handle_store)
+}
+
+impl client::Client<fn(crate::TokenStream) -> crate::TokenStream> {
+ pub fn run<S: Server>(
+ &self,
+ strategy: &impl ExecutionStrategy,
+ server: S,
+ input: S::TokenStream,
+ ) -> Result<S::TokenStream, PanicMessage> {
+ let client::Client { get_handle_counters, run, f } = *self;
+ run_server(
+ strategy,
+ get_handle_counters(),
+ server,
+ <MarkedTypes<S> as Types>::TokenStream::mark(input),
+ run,
+ f,
+ )
+ .map(<MarkedTypes<S> as Types>::TokenStream::unmark)
+ }
+}
+
+impl client::Client<fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream> {
+ pub fn run<S: Server>(
+ &self,
+ strategy: &impl ExecutionStrategy,
+ server: S,
+ input: S::TokenStream,
+ input2: S::TokenStream,
+ ) -> Result<S::TokenStream, PanicMessage> {
+ let client::Client { get_handle_counters, run, f } = *self;
+ run_server(
+ strategy,
+ get_handle_counters(),
+ server,
+ (
+ <MarkedTypes<S> as Types>::TokenStream::mark(input),
+ <MarkedTypes<S> as Types>::TokenStream::mark(input2),
+ ),
+ run,
+ f,
+ )
+ .map(<MarkedTypes<S> as Types>::TokenStream::unmark)
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/diagnostic.rs b/crates/proc_macro_srv/src/proc_macro/diagnostic.rs
new file mode 100644
index 000000000..55d93917c
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/diagnostic.rs
@@ -0,0 +1,172 @@
+//! lib-proc-macro diagnostic
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/diagnostic.rs
+//! augmented with removing unstable features
+
+use crate::proc_macro::Span;
+
+/// An enum representing a diagnostic level.
+#[derive(Copy, Clone, Debug)]
+#[non_exhaustive]
+pub enum Level {
+ /// An error.
+ Error,
+ /// A warning.
+ Warning,
+ /// A note.
+ Note,
+ /// A help message.
+ Help,
+}
+
+/// Trait implemented by types that can be converted into a set of `Span`s.
+pub trait MultiSpan {
+ /// Converts `self` into a `Vec<Span>`.
+ fn into_spans(self) -> Vec<Span>;
+}
+
+impl MultiSpan for Span {
+ fn into_spans(self) -> Vec<Span> {
+ vec![self]
+ }
+}
+
+impl MultiSpan for Vec<Span> {
+ fn into_spans(self) -> Vec<Span> {
+ self
+ }
+}
+
+impl<'a> MultiSpan for &'a [Span] {
+ fn into_spans(self) -> Vec<Span> {
+ self.to_vec()
+ }
+}
+
+/// A structure representing a diagnostic message and associated children
+/// messages.
+#[derive(Clone, Debug)]
+pub struct Diagnostic {
+ level: Level,
+ message: String,
+ spans: Vec<Span>,
+ children: Vec<Diagnostic>,
+}
+
+macro_rules! diagnostic_child_methods {
+ ($spanned:ident, $regular:ident, $level:expr) => {
+ /// Adds a new child diagnostic message to `self` with the level
+ /// identified by this method's name with the given `spans` and
+ /// `message`.
+ pub fn $spanned<S, T>(mut self, spans: S, message: T) -> Diagnostic
+ where
+ S: MultiSpan,
+ T: Into<String>,
+ {
+ self.children.push(Diagnostic::spanned(spans, $level, message));
+ self
+ }
+
+ /// Adds a new child diagnostic message to `self` with the level
+ /// identified by this method's name with the given `message`.
+ pub fn $regular<T: Into<String>>(mut self, message: T) -> Diagnostic {
+ self.children.push(Diagnostic::new($level, message));
+ self
+ }
+ };
+}
+
+/// Iterator over the children diagnostics of a `Diagnostic`.
+#[derive(Debug, Clone)]
+pub struct Children<'a>(std::slice::Iter<'a, Diagnostic>);
+
+impl<'a> Iterator for Children<'a> {
+ type Item = &'a Diagnostic;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ self.0.next()
+ }
+}
+
+impl Diagnostic {
+ /// Creates a new diagnostic with the given `level` and `message`.
+ pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
+ Diagnostic { level: level, message: message.into(), spans: vec![], children: vec![] }
+ }
+
+ /// Creates a new diagnostic with the given `level` and `message` pointing to
+ /// the given set of `spans`.
+ pub fn spanned<S, T>(spans: S, level: Level, message: T) -> Diagnostic
+ where
+ S: MultiSpan,
+ T: Into<String>,
+ {
+ Diagnostic {
+ level: level,
+ message: message.into(),
+ spans: spans.into_spans(),
+ children: vec![],
+ }
+ }
+
+ diagnostic_child_methods!(span_error, error, Level::Error);
+ diagnostic_child_methods!(span_warning, warning, Level::Warning);
+ diagnostic_child_methods!(span_note, note, Level::Note);
+ diagnostic_child_methods!(span_help, help, Level::Help);
+
+ /// Returns the diagnostic `level` for `self`.
+ pub fn level(&self) -> Level {
+ self.level
+ }
+
+ /// Sets the level in `self` to `level`.
+ pub fn set_level(&mut self, level: Level) {
+ self.level = level;
+ }
+
+ /// Returns the message in `self`.
+ pub fn message(&self) -> &str {
+ &self.message
+ }
+
+ /// Sets the message in `self` to `message`.
+ pub fn set_message<T: Into<String>>(&mut self, message: T) {
+ self.message = message.into();
+ }
+
+ /// Returns the `Span`s in `self`.
+ pub fn spans(&self) -> &[Span] {
+ &self.spans
+ }
+
+ /// Sets the `Span`s in `self` to `spans`.
+ pub fn set_spans<S: MultiSpan>(&mut self, spans: S) {
+ self.spans = spans.into_spans();
+ }
+
+ /// Returns an iterator over the children diagnostics of `self`.
+ pub fn children(&self) -> Children<'_> {
+ Children(self.children.iter())
+ }
+
+ /// Emit the diagnostic.
+ pub fn emit(self) {
+ fn to_internal(spans: Vec<Span>) -> crate::proc_macro::bridge::client::MultiSpan {
+ let mut multi_span = crate::proc_macro::bridge::client::MultiSpan::new();
+ for span in spans {
+ multi_span.push(span.0);
+ }
+ multi_span
+ }
+
+ let mut diag = crate::proc_macro::bridge::client::Diagnostic::new(
+ self.level,
+ &self.message[..],
+ to_internal(self.spans),
+ );
+ for c in self.children {
+ diag.sub(c.level, &c.message[..], to_internal(c.spans));
+ }
+ diag.emit();
+ }
+}
diff --git a/crates/proc_macro_srv/src/proc_macro/mod.rs b/crates/proc_macro_srv/src/proc_macro/mod.rs
new file mode 100644
index 000000000..ee0dc9722
--- /dev/null
+++ b/crates/proc_macro_srv/src/proc_macro/mod.rs
@@ -0,0 +1,926 @@
+//! lib-proc-macro main module
+//!
+//! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/lib.rs
+//! augmented with removing unstable features
+
+// NOTE(@edwin0cheng):
+// Because we just copy the bridge module from rustc for ABI compatible
+// There are some unused stuffs inside it.
+// We suppress these warning here.
+#[doc(hidden)]
+#[allow(unused_macros)]
+#[allow(unused_variables)]
+pub mod bridge;
+
+mod diagnostic;
+
+pub use diagnostic::{Diagnostic, Level, MultiSpan};
+
+use std::ops::{Bound, RangeBounds};
+use std::path::PathBuf;
+use std::str::FromStr;
+use std::{fmt, iter, mem};
+
+/// The main type provided by this crate, representing an abstract stream of
+/// tokens, or, more specifically, a sequence of token trees.
+/// The type provide interfaces for iterating over those token trees and, conversely,
+/// collecting a number of token trees into one stream.
+///
+/// This is both the input and output of `#[proc_macro]`, `#[proc_macro_attribute]`
+/// and `#[proc_macro_derive]` definitions.
+#[derive(Clone)]
+pub struct TokenStream(bridge::client::TokenStream);
+
+/// Error returned from `TokenStream::from_str`
+#[derive(Debug)]
+pub struct LexError {
+ _inner: (),
+}
+
+impl TokenStream {
+ /// Returns an empty `TokenStream` containing no token trees.
+ pub fn new() -> TokenStream {
+ TokenStream(bridge::client::TokenStream::new())
+ }
+
+ /// Checks if this `TokenStream` is empty.
+ pub fn is_empty(&self) -> bool {
+ self.0.is_empty()
+ }
+}
+
+/// Attempts to break the string into tokens and parse those tokens into a token stream.
+/// May fail for a number of reasons, for example, if the string contains unbalanced delimiters
+/// or characters not existing in the language.
+/// All tokens in the parsed stream get `Span::call_site()` spans.
+///
+/// NOTE: some errors may cause panics instead of returning `LexError`. We reserve the right to
+/// change these errors into `LexError`s later.
+impl FromStr for TokenStream {
+ type Err = LexError;
+
+ fn from_str(src: &str) -> Result<TokenStream, LexError> {
+ Ok(TokenStream(bridge::client::TokenStream::from_str(src)))
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for TokenStream {
+// fn to_string(&self) -> String {
+// self.0.to_string()
+// }
+// }
+
+/// Prints the token stream as a string that is supposed to be losslessly convertible back
+/// into the same token stream (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters and negative numeric literals.
+impl fmt::Display for TokenStream {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+/// Prints token in a form convenient for debugging.
+impl fmt::Debug for TokenStream {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("TokenStream ")?;
+ f.debug_list().entries(self.clone()).finish()
+ }
+}
+
+/// Creates a token stream containing a single token tree.
+impl From<TokenTree> for TokenStream {
+ fn from(tree: TokenTree) -> TokenStream {
+ TokenStream(bridge::client::TokenStream::from_token_tree(match tree {
+ TokenTree::Group(tt) => bridge::TokenTree::Group(tt.0),
+ TokenTree::Punct(tt) => bridge::TokenTree::Punct(tt.0),
+ TokenTree::Ident(tt) => bridge::TokenTree::Ident(tt.0),
+ TokenTree::Literal(tt) => bridge::TokenTree::Literal(tt.0),
+ }))
+ }
+}
+
+/// Collects a number of token trees into a single stream.
+impl iter::FromIterator<TokenTree> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self {
+ trees.into_iter().map(TokenStream::from).collect()
+ }
+}
+
+/// A "flattening" operation on token streams, collects token trees
+/// from multiple token streams into a single stream.
+impl iter::FromIterator<TokenStream> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
+ let mut builder = bridge::client::TokenStreamBuilder::new();
+ streams.into_iter().for_each(|stream| builder.push(stream.0));
+ TokenStream(builder.build())
+ }
+}
+
+impl Extend<TokenTree> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, trees: I) {
+ self.extend(trees.into_iter().map(TokenStream::from));
+ }
+}
+
+impl Extend<TokenStream> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
+ // FIXME(eddyb) Use an optimized implementation if/when possible.
+ *self = iter::once(mem::replace(self, Self::new())).chain(streams).collect();
+ }
+}
+
+/// Public implementation details for the `TokenStream` type, such as iterators.
+pub mod token_stream {
+ use crate::proc_macro::{bridge, Group, Ident, Literal, Punct, TokenStream, TokenTree};
+
+ /// An iterator over `TokenStream`'s `TokenTree`s.
+ /// The iteration is "shallow", e.g., the iterator doesn't recurse into delimited groups,
+ /// and returns whole groups as token trees.
+ #[derive(Clone)]
+ pub struct IntoIter(bridge::client::TokenStreamIter);
+
+ impl Iterator for IntoIter {
+ type Item = TokenTree;
+
+ fn next(&mut self) -> Option<TokenTree> {
+ self.0.next().map(|tree| match tree {
+ bridge::TokenTree::Group(tt) => TokenTree::Group(Group(tt)),
+ bridge::TokenTree::Punct(tt) => TokenTree::Punct(Punct(tt)),
+ bridge::TokenTree::Ident(tt) => TokenTree::Ident(Ident(tt)),
+ bridge::TokenTree::Literal(tt) => TokenTree::Literal(Literal(tt)),
+ })
+ }
+ }
+
+ impl IntoIterator for TokenStream {
+ type Item = TokenTree;
+ type IntoIter = IntoIter;
+
+ fn into_iter(self) -> IntoIter {
+ IntoIter(self.0.into_iter())
+ }
+ }
+}
+
+/// A region of source code, along with macro expansion information.
+#[derive(Copy, Clone)]
+pub struct Span(bridge::client::Span);
+
+macro_rules! diagnostic_method {
+ ($name:ident, $level:expr) => {
+ /// Creates a new `Diagnostic` with the given `message` at the span
+ /// `self`.
+ pub fn $name<T: Into<String>>(self, message: T) -> Diagnostic {
+ Diagnostic::spanned(self, $level, message)
+ }
+ };
+}
+
+impl Span {
+ /// A span that resolves at the macro definition site.
+ pub fn def_site() -> Span {
+ Span(bridge::client::Span::def_site())
+ }
+
+ /// The span of the invocation of the current procedural macro.
+ /// Identifiers created with this span will be resolved as if they were written
+ /// directly at the macro call location (call-site hygiene) and other code
+ /// at the macro call site will be able to refer to them as well.
+ pub fn call_site() -> Span {
+ Span(bridge::client::Span::call_site())
+ }
+
+ /// A span that represents `macro_rules` hygiene, and sometimes resolves at the macro
+ /// definition site (local variables, labels, `$crate`) and sometimes at the macro
+ /// call site (everything else).
+ /// The span location is taken from the call-site.
+ pub fn mixed_site() -> Span {
+ Span(bridge::client::Span::mixed_site())
+ }
+
+ /// The original source file into which this span points.
+ pub fn source_file(&self) -> SourceFile {
+ SourceFile(self.0.source_file())
+ }
+
+ /// The `Span` for the tokens in the previous macro expansion from which
+ /// `self` was generated from, if any.
+ pub fn parent(&self) -> Option<Span> {
+ self.0.parent().map(Span)
+ }
+
+ /// The span for the origin source code that `self` was generated from. If
+ /// this `Span` wasn't generated from other macro expansions then the return
+ /// value is the same as `*self`.
+ pub fn source(&self) -> Span {
+ Span(self.0.source())
+ }
+
+ /// Gets the starting line/column in the source file for this span.
+ pub fn start(&self) -> LineColumn {
+ self.0.start()
+ }
+
+ /// Gets the ending line/column in the source file for this span.
+ pub fn end(&self) -> LineColumn {
+ self.0.end()
+ }
+
+ /// Creates a new span encompassing `self` and `other`.
+ ///
+ /// Returns `None` if `self` and `other` are from different files.
+ pub fn join(&self, other: Span) -> Option<Span> {
+ self.0.join(other.0).map(Span)
+ }
+
+ /// Creates a new span with the same line/column information as `self` but
+ /// that resolves symbols as though it were at `other`.
+ pub fn resolved_at(&self, other: Span) -> Span {
+ Span(self.0.resolved_at(other.0))
+ }
+
+ /// Creates a new span with the same name resolution behavior as `self` but
+ /// with the line/column information of `other`.
+ pub fn located_at(&self, other: Span) -> Span {
+ other.resolved_at(*self)
+ }
+
+ /// Compares to spans to see if they're equal.
+ pub fn eq(&self, other: &Span) -> bool {
+ self.0 == other.0
+ }
+
+ /// Returns the source text behind a span. This preserves the original source
+ /// code, including spaces and comments. It only returns a result if the span
+ /// corresponds to real source code.
+ ///
+ /// Note: The observable result of a macro should only rely on the tokens and
+ /// not on this source text. The result of this function is a best effort to
+ /// be used for diagnostics only.
+ pub fn source_text(&self) -> Option<String> {
+ self.0.source_text()
+ }
+
+ diagnostic_method!(error, Level::Error);
+ diagnostic_method!(warning, Level::Warning);
+ diagnostic_method!(note, Level::Note);
+ diagnostic_method!(help, Level::Help);
+}
+
+/// Prints a span in a form convenient for debugging.
+impl fmt::Debug for Span {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.0.fmt(f)
+ }
+}
+
+/// A line-column pair representing the start or end of a `Span`.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub struct LineColumn {
+ /// The 1-indexed line in the source file on which the span starts or ends (inclusive).
+ pub line: usize,
+ /// The 0-indexed column (in UTF-8 characters) in the source file on which
+ /// the span starts or ends (inclusive).
+ pub column: usize,
+}
+
+/// The source file of a given `Span`.
+#[derive(Clone)]
+pub struct SourceFile(bridge::client::SourceFile);
+
+impl SourceFile {
+ /// Gets the path to this source file.
+ ///
+ /// ### Note
+ /// If the code span associated with this `SourceFile` was generated by an external macro, this
+ /// macro, this may not be an actual path on the filesystem. Use [`is_real`] to check.
+ ///
+ /// Also note that even if `is_real` returns `true`, if `--remap-path-prefix` was passed on
+ /// the command line, the path as given may not actually be valid.
+ ///
+ /// [`is_real`]: #method.is_real
+ pub fn path(&self) -> PathBuf {
+ PathBuf::from(self.0.path())
+ }
+
+ /// Returns `true` if this source file is a real source file, and not generated by an external
+ /// macro's expansion.
+ pub fn is_real(&self) -> bool {
+ // This is a hack until intercrate spans are implemented and we can have real source files
+ // for spans generated in external macros.
+ // https://github.com/rust-lang/rust/pull/43604#issuecomment-333334368
+ self.0.is_real()
+ }
+}
+
+impl fmt::Debug for SourceFile {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("SourceFile")
+ .field("path", &self.path())
+ .field("is_real", &self.is_real())
+ .finish()
+ }
+}
+
+impl PartialEq for SourceFile {
+ fn eq(&self, other: &Self) -> bool {
+ self.0.eq(&other.0)
+ }
+}
+
+impl Eq for SourceFile {}
+
+/// A single token or a delimited sequence of token trees (e.g., `[1, (), ..]`).
+#[derive(Clone)]
+pub enum TokenTree {
+ /// A token stream surrounded by bracket delimiters.
+ Group(Group),
+ /// An identifier.
+ Ident(Ident),
+ /// A single punctuation character (`+`, `,`, `$`, etc.).
+ Punct(Punct),
+ /// A literal character (`'a'`), string (`"hello"`), number (`2.3`), etc.
+ Literal(Literal),
+}
+
+impl TokenTree {
+ /// Returns the span of this tree, delegating to the `span` method of
+ /// the contained token or a delimited stream.
+ pub fn span(&self) -> Span {
+ match *self {
+ TokenTree::Group(ref t) => t.span(),
+ TokenTree::Ident(ref t) => t.span(),
+ TokenTree::Punct(ref t) => t.span(),
+ TokenTree::Literal(ref t) => t.span(),
+ }
+ }
+
+ /// Configures the span for *only this token*.
+ ///
+ /// Note that if this token is a `Group` then this method will not configure
+ /// the span of each of the internal tokens, this will simply delegate to
+ /// the `set_span` method of each variant.
+ pub fn set_span(&mut self, span: Span) {
+ match *self {
+ TokenTree::Group(ref mut t) => t.set_span(span),
+ TokenTree::Ident(ref mut t) => t.set_span(span),
+ TokenTree::Punct(ref mut t) => t.set_span(span),
+ TokenTree::Literal(ref mut t) => t.set_span(span),
+ }
+ }
+}
+
+/// Prints token tree in a form convenient for debugging.
+impl fmt::Debug for TokenTree {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ // Each of these has the name in the struct type in the derived debug,
+ // so don't bother with an extra layer of indirection
+ match *self {
+ TokenTree::Group(ref tt) => tt.fmt(f),
+ TokenTree::Ident(ref tt) => tt.fmt(f),
+ TokenTree::Punct(ref tt) => tt.fmt(f),
+ TokenTree::Literal(ref tt) => tt.fmt(f),
+ }
+ }
+}
+
+impl From<Group> for TokenTree {
+ fn from(g: Group) -> TokenTree {
+ TokenTree::Group(g)
+ }
+}
+
+impl From<Ident> for TokenTree {
+ fn from(g: Ident) -> TokenTree {
+ TokenTree::Ident(g)
+ }
+}
+
+impl From<Punct> for TokenTree {
+ fn from(g: Punct) -> TokenTree {
+ TokenTree::Punct(g)
+ }
+}
+
+impl From<Literal> for TokenTree {
+ fn from(g: Literal) -> TokenTree {
+ TokenTree::Literal(g)
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for TokenTree {
+// fn to_string(&self) -> String {
+// match *self {
+// TokenTree::Group(ref t) => t.to_string(),
+// TokenTree::Ident(ref t) => t.to_string(),
+// TokenTree::Punct(ref t) => t.to_string(),
+// TokenTree::Literal(ref t) => t.to_string(),
+// }
+// }
+// }
+
+/// Prints the token tree as a string that is supposed to be losslessly convertible back
+/// into the same token tree (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters and negative numeric literals.
+impl fmt::Display for TokenTree {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+/// A delimited token stream.
+///
+/// A `Group` internally contains a `TokenStream` which is surrounded by `Delimiter`s.
+#[derive(Clone)]
+pub struct Group(bridge::client::Group);
+
+/// Describes how a sequence of token trees is delimited.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum Delimiter {
+ /// `( ... )`
+ Parenthesis,
+ /// `{ ... }`
+ Brace,
+ /// `[ ... ]`
+ Bracket,
+ /// `Ø ... Ø`
+ /// An implicit delimiter, that may, for example, appear around tokens coming from a
+ /// "macro variable" `$var`. It is important to preserve operator priorities in cases like
+ /// `$var * 3` where `$var` is `1 + 2`.
+ /// Implicit delimiters may not survive roundtrip of a token stream through a string.
+ None,
+}
+
+impl Group {
+ /// Creates a new `Group` with the given delimiter and token stream.
+ ///
+ /// This constructor will set the span for this group to
+ /// `Span::call_site()`. To change the span you can use the `set_span`
+ /// method below.
+ pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group {
+ Group(bridge::client::Group::new(delimiter, stream.0))
+ }
+
+ /// Returns the delimiter of this `Group`
+ pub fn delimiter(&self) -> Delimiter {
+ self.0.delimiter()
+ }
+
+ /// Returns the `TokenStream` of tokens that are delimited in this `Group`.
+ ///
+ /// Note that the returned token stream does not include the delimiter
+ /// returned above.
+ pub fn stream(&self) -> TokenStream {
+ TokenStream(self.0.stream())
+ }
+
+ /// Returns the span for the delimiters of this token stream, spanning the
+ /// entire `Group`.
+ ///
+ /// ```text
+ /// pub fn span(&self) -> Span {
+ /// ^^^^^^^
+ /// ```
+ pub fn span(&self) -> Span {
+ Span(self.0.span())
+ }
+
+ /// Returns the span pointing to the opening delimiter of this group.
+ ///
+ /// ```text
+ /// pub fn span_open(&self) -> Span {
+ /// ^
+ /// ```
+ pub fn span_open(&self) -> Span {
+ Span(self.0.span_open())
+ }
+
+ /// Returns the span pointing to the closing delimiter of this group.
+ ///
+ /// ```text
+ /// pub fn span_close(&self) -> Span {
+ /// ^
+ /// ```
+ pub fn span_close(&self) -> Span {
+ Span(self.0.span_close())
+ }
+
+ /// Configures the span for this `Group`'s delimiters, but not its internal
+ /// tokens.
+ ///
+ /// This method will **not** set the span of all the internal tokens spanned
+ /// by this group, but rather it will only set the span of the delimiter
+ /// tokens at the level of the `Group`.
+ pub fn set_span(&mut self, span: Span) {
+ self.0.set_span(span.0);
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for Group {
+// fn to_string(&self) -> String {
+// TokenStream::from(TokenTree::from(self.clone())).to_string()
+// }
+// }
+
+/// Prints the group as a string that should be losslessly convertible back
+/// into the same group (modulo spans), except for possibly `TokenTree::Group`s
+/// with `Delimiter::None` delimiters.
+impl fmt::Display for Group {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+impl fmt::Debug for Group {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Group")
+ .field("delimiter", &self.delimiter())
+ .field("stream", &self.stream())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+/// An `Punct` is an single punctuation character like `+`, `-` or `#`.
+///
+/// Multi-character operators like `+=` are represented as two instances of `Punct` with different
+/// forms of `Spacing` returned.
+#[derive(Clone)]
+pub struct Punct(bridge::client::Punct);
+
+/// Whether an `Punct` is followed immediately by another `Punct` or
+/// followed by another token or whitespace.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub enum Spacing {
+ /// e.g., `+` is `Alone` in `+ =`, `+ident` or `+()`.
+ Alone,
+ /// e.g., `+` is `Joint` in `+=` or `'#`.
+ /// Additionally, single quote `'` can join with identifiers to form lifetimes `'ident`.
+ Joint,
+}
+
+impl Punct {
+ /// Creates a new `Punct` from the given character and spacing.
+ /// The `ch` argument must be a valid punctuation character permitted by the language,
+ /// otherwise the function will panic.
+ ///
+ /// The returned `Punct` will have the default span of `Span::call_site()`
+ /// which can be further configured with the `set_span` method below.
+ pub fn new(ch: char, spacing: Spacing) -> Punct {
+ Punct(bridge::client::Punct::new(ch, spacing))
+ }
+
+ /// Returns the value of this punctuation character as `char`.
+ pub fn as_char(&self) -> char {
+ self.0.as_char()
+ }
+
+ /// Returns the spacing of this punctuation character, indicating whether it's immediately
+ /// followed by another `Punct` in the token stream, so they can potentially be combined into
+ /// a multi-character operator (`Joint`), or it's followed by some other token or whitespace
+ /// (`Alone`) so the operator has certainly ended.
+ pub fn spacing(&self) -> Spacing {
+ self.0.spacing()
+ }
+
+ /// Returns the span for this punctuation character.
+ pub fn span(&self) -> Span {
+ Span(self.0.span())
+ }
+
+ /// Configure the span for this punctuation character.
+ pub fn set_span(&mut self, span: Span) {
+ self.0 = self.0.with_span(span.0);
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for Punct {
+// fn to_string(&self) -> String {
+// TokenStream::from(TokenTree::from(self.clone())).to_string()
+// }
+// }
+
+/// Prints the punctuation character as a string that should be losslessly convertible
+/// back into the same character.
+impl fmt::Display for Punct {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+impl fmt::Debug for Punct {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Punct")
+ .field("ch", &self.as_char())
+ .field("spacing", &self.spacing())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+/// An identifier (`ident`).
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub struct Ident(bridge::client::Ident);
+
+impl Ident {
+ /// Creates a new `Ident` with the given `string` as well as the specified
+ /// `span`.
+ /// The `string` argument must be a valid identifier permitted by the
+ /// language, otherwise the function will panic.
+ ///
+ /// Note that `span`, currently in rustc, configures the hygiene information
+ /// for this identifier.
+ ///
+ /// As of this time `Span::call_site()` explicitly opts-in to "call-site" hygiene
+ /// meaning that identifiers created with this span will be resolved as if they were written
+ /// directly at the location of the macro call, and other code at the macro call site will be
+ /// able to refer to them as well.
+ ///
+ /// Later spans like `Span::def_site()` will allow to opt-in to "definition-site" hygiene
+ /// meaning that identifiers created with this span will be resolved at the location of the
+ /// macro definition and other code at the macro call site will not be able to refer to them.
+ ///
+ /// Due to the current importance of hygiene this constructor, unlike other
+ /// tokens, requires a `Span` to be specified at construction.
+ pub fn new(string: &str, span: Span) -> Ident {
+ Ident(bridge::client::Ident::new(string, span.0, false))
+ }
+
+ /// Same as `Ident::new`, but creates a raw identifier (`r#ident`).
+ pub fn new_raw(string: &str, span: Span) -> Ident {
+ Ident(bridge::client::Ident::new(string, span.0, true))
+ }
+
+ /// Returns the span of this `Ident`, encompassing the entire string returned
+ /// by `as_str`.
+ pub fn span(&self) -> Span {
+ Span(self.0.span())
+ }
+
+ /// Configures the span of this `Ident`, possibly changing its hygiene context.
+ pub fn set_span(&mut self, span: Span) {
+ self.0 = self.0.with_span(span.0);
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for Ident {
+// fn to_string(&self) -> String {
+// TokenStream::from(TokenTree::from(self.clone())).to_string()
+// }
+// }
+
+/// Prints the identifier as a string that should be losslessly convertible
+/// back into the same identifier.
+impl fmt::Display for Ident {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+impl fmt::Debug for Ident {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Ident")
+ .field("ident", &self.to_string())
+ .field("span", &self.span())
+ .finish()
+ }
+}
+
+/// A literal string (`"hello"`), byte string (`b"hello"`),
+/// character (`'a'`), byte character (`b'a'`), an integer or floating point number
+/// with or without a suffix (`1`, `1u8`, `2.3`, `2.3f32`).
+/// Boolean literals like `true` and `false` do not belong here, they are `Ident`s.
+#[derive(Clone)]
+pub struct Literal(bridge::client::Literal);
+
+macro_rules! suffixed_int_literals {
+ ($($name:ident => $kind:ident,)*) => ($(
+ /// Creates a new suffixed integer literal with the specified value.
+ ///
+ /// This function will create an integer like `1u32` where the integer
+ /// value specified is the first part of the token and the integral is
+ /// also suffixed at the end.
+ /// Literals created from negative numbers may not survive round-trips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// Literals created through this method have the `Span::call_site()`
+ /// span by default, which can be configured with the `set_span` method
+ /// below.
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::client::Literal::typed_integer(&n.to_string(), stringify!($kind)))
+ }
+ )*)
+}
+
+macro_rules! unsuffixed_int_literals {
+ ($($name:ident => $kind:ident,)*) => ($(
+ /// Creates a new unsuffixed integer literal with the specified value.
+ ///
+ /// This function will create an integer like `1` where the integer
+ /// value specified is the first part of the token. No suffix is
+ /// specified on this token, meaning that invocations like
+ /// `Literal::i8_unsuffixed(1)` are equivalent to
+ /// `Literal::u32_unsuffixed(1)`.
+ /// Literals created from negative numbers may not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// Literals created through this method have the `Span::call_site()`
+ /// span by default, which can be configured with the `set_span` method
+ /// below.
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::client::Literal::integer(&n.to_string()))
+ }
+ )*)
+}
+
+impl Literal {
+ suffixed_int_literals! {
+ u8_suffixed => u8,
+ u16_suffixed => u16,
+ u32_suffixed => u32,
+ u64_suffixed => u64,
+ u128_suffixed => u128,
+ usize_suffixed => usize,
+ i8_suffixed => i8,
+ i16_suffixed => i16,
+ i32_suffixed => i32,
+ i64_suffixed => i64,
+ i128_suffixed => i128,
+ isize_suffixed => isize,
+ }
+
+ unsuffixed_int_literals! {
+ u8_unsuffixed => u8,
+ u16_unsuffixed => u16,
+ u32_unsuffixed => u32,
+ u64_unsuffixed => u64,
+ u128_unsuffixed => u128,
+ usize_unsuffixed => usize,
+ i8_unsuffixed => i8,
+ i16_unsuffixed => i16,
+ i32_unsuffixed => i32,
+ i64_unsuffixed => i64,
+ i128_unsuffixed => i128,
+ isize_unsuffixed => isize,
+ }
+
+ /// Creates a new unsuffixed floating-point literal.
+ ///
+ /// This constructor is similar to those like `Literal::i8_unsuffixed` where
+ /// the float's value is emitted directly into the token but no suffix is
+ /// used, so it may be inferred to be a `f64` later in the compiler.
+ /// Literals created from negative numbers may not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ pub fn f32_unsuffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {}", n);
+ }
+ Literal(bridge::client::Literal::float(&n.to_string()))
+ }
+
+ /// Creates a new suffixed floating-point literal.
+ ///
+ /// This constructor will create a literal like `1.0f32` where the value
+ /// specified is the preceding part of the token and `f32` is the suffix of
+ /// the token. This token will always be inferred to be an `f32` in the
+ /// compiler.
+ /// Literals created from negative numbers may not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ pub fn f32_suffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {}", n);
+ }
+ Literal(bridge::client::Literal::f32(&n.to_string()))
+ }
+
+ /// Creates a new unsuffixed floating-point literal.
+ ///
+ /// This constructor is similar to those like `Literal::i8_unsuffixed` where
+ /// the float's value is emitted directly into the token but no suffix is
+ /// used, so it may be inferred to be a `f64` later in the compiler.
+ /// Literals created from negative numbers may not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ pub fn f64_unsuffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {}", n);
+ }
+ Literal(bridge::client::Literal::float(&n.to_string()))
+ }
+
+ /// Creates a new suffixed floating-point literal.
+ ///
+ /// This constructor will create a literal like `1.0f64` where the value
+ /// specified is the preceding part of the token and `f64` is the suffix of
+ /// the token. This token will always be inferred to be an `f64` in the
+ /// compiler.
+ /// Literals created from negative numbers may not survive rountrips through
+ /// `TokenStream` or strings and may be broken into two tokens (`-` and positive literal).
+ ///
+ /// # Panics
+ ///
+ /// This function requires that the specified float is finite, for
+ /// example if it is infinity or NaN this function will panic.
+ pub fn f64_suffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {}", n);
+ }
+ Literal(bridge::client::Literal::f64(&n.to_string()))
+ }
+
+ /// String literal.
+ pub fn string(string: &str) -> Literal {
+ Literal(bridge::client::Literal::string(string))
+ }
+
+ /// Character literal.
+ pub fn character(ch: char) -> Literal {
+ Literal(bridge::client::Literal::character(ch))
+ }
+
+ /// Byte string literal.
+ pub fn byte_string(bytes: &[u8]) -> Literal {
+ Literal(bridge::client::Literal::byte_string(bytes))
+ }
+
+ /// Returns the span encompassing this literal.
+ pub fn span(&self) -> Span {
+ Span(self.0.span())
+ }
+
+ /// Configures the span associated for this literal.
+ pub fn set_span(&mut self, span: Span) {
+ self.0.set_span(span.0);
+ }
+
+ /// Returns a `Span` that is a subset of `self.span()` containing only the
+ /// source bytes in range `range`. Returns `None` if the would-be trimmed
+ /// span is outside the bounds of `self`.
+ // FIXME(SergioBenitez): check that the byte range starts and ends at a
+ // UTF-8 boundary of the source. otherwise, it's likely that a panic will
+ // occur elsewhere when the source text is printed.
+ // FIXME(SergioBenitez): there is no way for the user to know what
+ // `self.span()` actually maps to, so this method can currently only be
+ // called blindly. For example, `to_string()` for the character 'c' returns
+ // "'\u{63}'"; there is no way for the user to know whether the source text
+ // was 'c' or whether it was '\u{63}'.
+ pub fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> {
+ // HACK(eddyb) something akin to `Option::cloned`, but for `Bound<&T>`.
+ fn cloned_bound<T: Clone>(bound: Bound<&T>) -> Bound<T> {
+ match bound {
+ Bound::Included(x) => Bound::Included(x.clone()),
+ Bound::Excluded(x) => Bound::Excluded(x.clone()),
+ Bound::Unbounded => Bound::Unbounded,
+ }
+ }
+
+ self.0.subspan(cloned_bound(range.start_bound()), cloned_bound(range.end_bound())).map(Span)
+ }
+}
+
+// N.B., the bridge only provides `to_string`, implement `fmt::Display`
+// based on it (the reverse of the usual relationship between the two).
+// impl ToString for Literal {
+// fn to_string(&self) -> String {
+// TokenStream::from(TokenTree::from(self.clone())).to_string()
+// }
+// }
+
+/// Prints the literal as a string that should be losslessly convertible
+/// back into the same literal (except for possible rounding for floating point literals).
+impl fmt::Display for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+impl fmt::Debug for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ // FIXME(eddyb) `Literal` should not expose internal `Debug` impls.
+ self.0.fmt(f)
+ }
+}
--
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