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-rw-r--r--library/proc_macro/Cargo.toml11
-rw-r--r--library/proc_macro/src/bridge/arena.rs113
-rw-r--r--library/proc_macro/src/bridge/buffer.rs156
-rw-r--r--library/proc_macro/src/bridge/client.rs510
-rw-r--r--library/proc_macro/src/bridge/closure.rs32
-rw-r--r--library/proc_macro/src/bridge/fxhash.rs117
-rw-r--r--library/proc_macro/src/bridge/handle.rs75
-rw-r--r--library/proc_macro/src/bridge/mod.rs524
-rw-r--r--library/proc_macro/src/bridge/rpc.rs304
-rw-r--r--library/proc_macro/src/bridge/scoped_cell.rs81
-rw-r--r--library/proc_macro/src/bridge/selfless_reify.rs84
-rw-r--r--library/proc_macro/src/bridge/server.rs339
-rw-r--r--library/proc_macro/src/bridge/symbol.rs205
-rw-r--r--library/proc_macro/src/diagnostic.rs182
-rw-r--r--library/proc_macro/src/lib.rs1526
-rw-r--r--library/proc_macro/src/quote.rs141
16 files changed, 4400 insertions, 0 deletions
diff --git a/library/proc_macro/Cargo.toml b/library/proc_macro/Cargo.toml
new file mode 100644
index 000000000..e54a50aa1
--- /dev/null
+++ b/library/proc_macro/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "proc_macro"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+std = { path = "../std" }
+# Workaround: when documenting this crate rustdoc will try to load crate named
+# `core` when resolving doc links. Without this line a different `core` will be
+# loaded from sysroot causing duplicate lang items and other similar errors.
+core = { path = "../core" }
diff --git a/library/proc_macro/src/bridge/arena.rs b/library/proc_macro/src/bridge/arena.rs
new file mode 100644
index 000000000..fa72d2816
--- /dev/null
+++ b/library/proc_macro/src/bridge/arena.rs
@@ -0,0 +1,113 @@
+//! A minimal arena allocator inspired by `rustc_arena::DroplessArena`.
+//!
+//! This is unfortunately a minimal re-implementation rather than a dependency
+//! as it is difficult to depend on crates from within `proc_macro`, due to it
+//! being built at the same time as `std`.
+
+use std::cell::{Cell, RefCell};
+use std::cmp;
+use std::mem::MaybeUninit;
+use std::ops::Range;
+use std::ptr;
+use std::slice;
+use std::str;
+
+// The arenas start with PAGE-sized chunks, and then each new chunk is twice as
+// big as its predecessor, up until we reach HUGE_PAGE-sized chunks, whereupon
+// we stop growing. This scales well, from arenas that are barely used up to
+// arenas that are used for 100s of MiBs. Note also that the chosen sizes match
+// the usual sizes of pages and huge pages on Linux.
+const PAGE: usize = 4096;
+const HUGE_PAGE: usize = 2 * 1024 * 1024;
+
+/// A minimal arena allocator inspired by `rustc_arena::DroplessArena`.
+///
+/// This is unfortunately a complete re-implementation rather than a dependency
+/// as it is difficult to depend on crates from within `proc_macro`, due to it
+/// being built at the same time as `std`.
+///
+/// This arena doesn't have support for allocating anything other than byte
+/// slices, as that is all that is necessary.
+pub(crate) struct Arena {
+ start: Cell<*mut MaybeUninit<u8>>,
+ end: Cell<*mut MaybeUninit<u8>>,
+ chunks: RefCell<Vec<Box<[MaybeUninit<u8>]>>>,
+}
+
+impl Arena {
+ pub(crate) fn new() -> Self {
+ Arena {
+ start: Cell::new(ptr::null_mut()),
+ end: Cell::new(ptr::null_mut()),
+ chunks: RefCell::new(Vec::new()),
+ }
+ }
+
+ /// Add a new chunk with at least `additional` free bytes.
+ #[inline(never)]
+ #[cold]
+ fn grow(&self, additional: usize) {
+ let mut chunks = self.chunks.borrow_mut();
+ let mut new_cap;
+ if let Some(last_chunk) = chunks.last_mut() {
+ // If the previous chunk's len is less than HUGE_PAGE
+ // bytes, then this chunk will be least double the previous
+ // chunk's size.
+ new_cap = last_chunk.len().min(HUGE_PAGE / 2);
+ new_cap *= 2;
+ } else {
+ new_cap = PAGE;
+ }
+ // Also ensure that this chunk can fit `additional`.
+ new_cap = cmp::max(additional, new_cap);
+
+ let mut chunk = Box::new_uninit_slice(new_cap);
+ let Range { start, end } = chunk.as_mut_ptr_range();
+ self.start.set(start);
+ self.end.set(end);
+ chunks.push(chunk);
+ }
+
+ /// Allocates a byte slice with specified size from the current memory
+ /// chunk. Returns `None` if there is no free space left to satisfy the
+ /// request.
+ fn alloc_raw_without_grow(&self, bytes: usize) -> Option<&mut [MaybeUninit<u8>]> {
+ let start = self.start.get().addr();
+ let old_end = self.end.get();
+ let end = old_end.addr();
+
+ let new_end = end.checked_sub(bytes)?;
+ if start <= new_end {
+ let new_end = old_end.with_addr(new_end);
+ self.end.set(new_end);
+ // SAFETY: `bytes` bytes starting at `new_end` were just reserved.
+ Some(unsafe { slice::from_raw_parts_mut(new_end, bytes) })
+ } else {
+ None
+ }
+ }
+
+ fn alloc_raw(&self, bytes: usize) -> &mut [MaybeUninit<u8>] {
+ if bytes == 0 {
+ return &mut [];
+ }
+
+ loop {
+ if let Some(a) = self.alloc_raw_without_grow(bytes) {
+ break a;
+ }
+ // No free space left. Allocate a new chunk to satisfy the request.
+ // On failure the grow will panic or abort.
+ self.grow(bytes);
+ }
+ }
+
+ pub(crate) fn alloc_str<'a>(&'a self, string: &str) -> &'a mut str {
+ let alloc = self.alloc_raw(string.len());
+ let bytes = MaybeUninit::write_slice(alloc, string.as_bytes());
+
+ // SAFETY: we convert from `&str` to `&[u8]`, clone it into the arena,
+ // and immediately convert the clone back to `&str`.
+ unsafe { str::from_utf8_unchecked_mut(bytes) }
+ }
+}
diff --git a/library/proc_macro/src/bridge/buffer.rs b/library/proc_macro/src/bridge/buffer.rs
new file mode 100644
index 000000000..48030f8d8
--- /dev/null
+++ b/library/proc_macro/src/bridge/buffer.rs
@@ -0,0 +1,156 @@
+//! Buffer management for same-process client<->server communication.
+
+use std::io::{self, Write};
+use std::mem;
+use std::ops::{Deref, DerefMut};
+use std::slice;
+
+#[repr(C)]
+pub struct Buffer {
+ data: *mut u8,
+ len: usize,
+ capacity: usize,
+ reserve: extern "C" fn(Buffer, usize) -> Buffer,
+ drop: extern "C" fn(Buffer),
+}
+
+unsafe impl Sync for Buffer {}
+unsafe impl Send for Buffer {}
+
+impl Default for Buffer {
+ #[inline]
+ fn default() -> Self {
+ Self::from(vec![])
+ }
+}
+
+impl Deref for Buffer {
+ type Target = [u8];
+ #[inline]
+ fn deref(&self) -> &[u8] {
+ unsafe { slice::from_raw_parts(self.data as *const u8, self.len) }
+ }
+}
+
+impl DerefMut for Buffer {
+ #[inline]
+ fn deref_mut(&mut self) -> &mut [u8] {
+ unsafe { slice::from_raw_parts_mut(self.data, self.len) }
+ }
+}
+
+impl Buffer {
+ #[inline]
+ pub(super) fn new() -> Self {
+ Self::default()
+ }
+
+ #[inline]
+ pub(super) fn clear(&mut self) {
+ self.len = 0;
+ }
+
+ #[inline]
+ pub(super) fn take(&mut self) -> Self {
+ mem::take(self)
+ }
+
+ // We have the array method separate from extending from a slice. This is
+ // because in the case of small arrays, codegen can be more efficient
+ // (avoiding a memmove call). With extend_from_slice, LLVM at least
+ // currently is not able to make that optimization.
+ #[inline]
+ pub(super) fn extend_from_array<const N: usize>(&mut self, xs: &[u8; N]) {
+ if xs.len() > (self.capacity - self.len) {
+ let b = self.take();
+ *self = (b.reserve)(b, xs.len());
+ }
+ unsafe {
+ xs.as_ptr().copy_to_nonoverlapping(self.data.add(self.len), xs.len());
+ self.len += xs.len();
+ }
+ }
+
+ #[inline]
+ pub(super) fn extend_from_slice(&mut self, xs: &[u8]) {
+ if xs.len() > (self.capacity - self.len) {
+ let b = self.take();
+ *self = (b.reserve)(b, xs.len());
+ }
+ unsafe {
+ xs.as_ptr().copy_to_nonoverlapping(self.data.add(self.len), xs.len());
+ self.len += xs.len();
+ }
+ }
+
+ #[inline]
+ pub(super) fn push(&mut self, v: u8) {
+ // The code here is taken from Vec::push, and we know that reserve()
+ // will panic if we're exceeding isize::MAX bytes and so there's no need
+ // to check for overflow.
+ if self.len == self.capacity {
+ let b = self.take();
+ *self = (b.reserve)(b, 1);
+ }
+ unsafe {
+ *self.data.add(self.len) = v;
+ self.len += 1;
+ }
+ }
+}
+
+impl Write for Buffer {
+ #[inline]
+ fn write(&mut self, xs: &[u8]) -> io::Result<usize> {
+ self.extend_from_slice(xs);
+ Ok(xs.len())
+ }
+
+ #[inline]
+ fn write_all(&mut self, xs: &[u8]) -> io::Result<()> {
+ self.extend_from_slice(xs);
+ Ok(())
+ }
+
+ #[inline]
+ fn flush(&mut self) -> io::Result<()> {
+ Ok(())
+ }
+}
+
+impl Drop for Buffer {
+ #[inline]
+ fn drop(&mut self) {
+ let b = self.take();
+ (b.drop)(b);
+ }
+}
+
+impl From<Vec<u8>> for Buffer {
+ fn from(mut v: Vec<u8>) -> 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(b: Buffer) -> Vec<u8> {
+ unsafe {
+ let Buffer { data, len, capacity, .. } = b;
+ mem::forget(b);
+ Vec::from_raw_parts(data, len, capacity)
+ }
+ }
+
+ extern "C" fn reserve(b: Buffer, additional: usize) -> Buffer {
+ let mut v = to_vec(b);
+ v.reserve(additional);
+ Buffer::from(v)
+ }
+
+ extern "C" fn drop(b: Buffer) {
+ mem::drop(to_vec(b));
+ }
+
+ Buffer { data, len, capacity, reserve, drop }
+ }
+}
diff --git a/library/proc_macro/src/bridge/client.rs b/library/proc_macro/src/bridge/client.rs
new file mode 100644
index 000000000..1516f084a
--- /dev/null
+++ b/library/proc_macro/src/bridge/client.rs
@@ -0,0 +1,510 @@
+//! Client-side types.
+
+use super::*;
+
+use std::marker::PhantomData;
+
+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`.
+ #[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),)*
+ }
+ }
+ }
+
+ $(
+ pub(crate) struct $oty {
+ handle: handle::Handle,
+ // Prevent Send and Sync impls. `!Send`/`!Sync` is the usual
+ // way of doing this, but that requires unstable features.
+ // rust-analyzer uses this code and avoids unstable features.
+ _marker: PhantomData<*mut ()>,
+ }
+
+ // Forward `Drop::drop` to the inherent `drop` method.
+ impl Drop for $oty {
+ fn drop(&mut self) {
+ $oty {
+ handle: self.handle,
+ _marker: PhantomData,
+ }.drop();
+ }
+ }
+
+ impl<S> Encode<S> for $oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ let handle = self.handle;
+ mem::forget(self);
+ handle.encode(w, s);
+ }
+ }
+
+ impl<S: server::Types> DecodeMut<'_, '_, HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$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 &$oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.handle.encode(w, s);
+ }
+ }
+
+ impl<'s, S: server::Types> Decode<'_, 's, HandleStore<server::MarkedTypes<S>>>
+ for &'s Marked<S::$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 $oty {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.handle.encode(w, s);
+ }
+ }
+
+ impl<'s, S: server::Types> DecodeMut<'_, 's, HandleStore<server::MarkedTypes<S>>>
+ for &'s mut Marked<S::$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::Handle::decode(r, s),
+ _marker: PhantomData,
+ }
+ }
+ }
+ )*
+
+ $(
+ #[derive(Copy, Clone, PartialEq, Eq, Hash)]
+ pub(crate) struct $ity {
+ handle: handle::Handle,
+ // Prevent Send and Sync impls. `!Send`/`!Sync` is the usual
+ // way of doing this, but that requires unstable features.
+ // rust-analyzer uses this code and avoids unstable features.
+ _marker: PhantomData<*mut ()>,
+ }
+
+ impl<S> Encode<S> for $ity {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.handle.encode(w, s);
+ }
+ }
+
+ impl<S: server::Types> DecodeMut<'_, '_, HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::$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 {
+ $ity {
+ handle: handle::Handle::decode(r, s),
+ _marker: PhantomData,
+ }
+ }
+ }
+ )*
+ }
+}
+define_handles! {
+ 'owned:
+ FreeFunctions,
+ TokenStream,
+ SourceFile,
+ MultiSpan,
+ Diagnostic,
+
+ 'interned:
+ Span,
+}
+
+// FIXME(eddyb) generate these impls by pattern-matching on the
+// names of methods - also could use the presence of `fn drop`
+// to distinguish between 'owned and 'interned, above.
+// Alternatively, special "modes" could be listed of types in with_api
+// instead of pattern matching on methods, here and in server decl.
+
+impl Clone for TokenStream {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl Clone for SourceFile {
+ fn clone(&self) -> Self {
+ self.clone()
+ }
+}
+
+impl Span {
+ pub(crate) fn def_site() -> Span {
+ Bridge::with(|bridge| bridge.globals.def_site)
+ }
+
+ pub(crate) fn call_site() -> Span {
+ Bridge::with(|bridge| bridge.globals.call_site)
+ }
+
+ pub(crate) fn mixed_site() -> Span {
+ Bridge::with(|bridge| bridge.globals.mixed_site)
+ }
+}
+
+impl fmt::Debug for Span {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.debug())
+ }
+}
+
+pub(crate) use super::symbol::Symbol;
+
+macro_rules! define_client_side {
+ ($($name:ident {
+ $(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)*;)*
+ }),* $(,)?) => {
+ $(impl $name {
+ $(pub(crate) fn $method($($arg: $arg_ty),*) $(-> $ret_ty)* {
+ Bridge::with(|bridge| {
+ let mut buf = bridge.cached_buffer.take();
+
+ buf.clear();
+ api_tags::Method::$name(api_tags::$name::$method).encode(&mut buf, &mut ());
+ reverse_encode!(buf; $($arg),*);
+
+ buf = bridge.dispatch.call(buf);
+
+ let r = Result::<_, PanicMessage>::decode(&mut &buf[..], &mut ());
+
+ bridge.cached_buffer = buf;
+
+ r.unwrap_or_else(|e| panic::resume_unwind(e.into()))
+ })
+ })*
+ })*
+ }
+}
+with_api!(self, self, define_client_side);
+
+struct Bridge<'a> {
+ /// Reusable buffer (only `clear`-ed, never shrunk), primarily
+ /// used for making requests.
+ cached_buffer: Buffer,
+
+ /// Server-side function that the client uses to make requests.
+ dispatch: closure::Closure<'a, Buffer, Buffer>,
+
+ /// Provided globals for this macro expansion.
+ globals: ExpnGlobals<Span>,
+}
+
+impl<'a> !Send for Bridge<'a> {}
+impl<'a> !Sync for Bridge<'a> {}
+
+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 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),
+ })
+ }
+}
+
+pub(crate) fn is_available() -> bool {
+ BridgeState::with(|state| match state {
+ BridgeState::Connected(_) | BridgeState::InUse => true,
+ BridgeState::NotConnected => false,
+ })
+}
+
+/// A client-side RPC entry-point, which may be using a different `proc_macro`
+/// from the one used by the server, but can be invoked compatibly.
+///
+/// Note that the (phantom) `I` ("input") and `O` ("output") type parameters
+/// decorate the `Client<I, O>` with the RPC "interface" of the entry-point, but
+/// do not themselves participate in ABI, at all, only facilitate type-checking.
+///
+/// E.g. `Client<TokenStream, TokenStream>` is the common proc macro interface,
+/// used for `#[proc_macro] fn foo(input: TokenStream) -> TokenStream`,
+/// indicating that the RPC input and output will be serialized token streams,
+/// and forcing the use of APIs that take/return `S::TokenStream`, server-side.
+#[repr(C)]
+pub struct Client<I, O> {
+ // 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(BridgeConfig<'_>) -> Buffer,
+
+ pub(super) _marker: PhantomData<fn(I) -> O>,
+}
+
+impl<I, O> Copy for Client<I, O> {}
+impl<I, O> Clone for Client<I, O> {
+ fn clone(&self) -> Self {
+ *self
+ }
+}
+
+fn maybe_install_panic_hook(force_show_panics: bool) {
+ // 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 show = BridgeState::with(|state| match state {
+ BridgeState::NotConnected => true,
+ BridgeState::Connected(_) | BridgeState::InUse => force_show_panics,
+ });
+ if show {
+ prev(info)
+ }
+ }));
+ });
+}
+
+/// 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<()>>(
+ config: BridgeConfig<'_>,
+ f: impl FnOnce(A) -> R,
+) -> Buffer {
+ let BridgeConfig { input: mut buf, dispatch, force_show_panics, .. } = config;
+
+ panic::catch_unwind(panic::AssertUnwindSafe(|| {
+ maybe_install_panic_hook(force_show_panics);
+
+ // Make sure the symbol store is empty before decoding inputs.
+ Symbol::invalidate_all();
+
+ let reader = &mut &buf[..];
+ let (globals, input) = <(ExpnGlobals<Span>, A)>::decode(reader, &mut ());
+
+ // Put the buffer we used for input back in the `Bridge` for requests.
+ let new_state =
+ BridgeState::Connected(Bridge { cached_buffer: buf.take(), dispatch, globals });
+
+ BRIDGE_STATE.with(|state| {
+ state.set(new_state, || {
+ let output = f(input);
+
+ // Take the `cached_buffer` back out, for the output value.
+ buf = 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 might not
+ // at the moment, so this is also potentially preventing UB).
+ buf.clear();
+ Ok::<_, ()>(output).encode(&mut buf, &mut ());
+ })
+ })
+ }))
+ .map_err(PanicMessage::from)
+ .unwrap_or_else(|e| {
+ buf.clear();
+ Err::<(), _>(e).encode(&mut buf, &mut ());
+ });
+
+ // Now that a response has been serialized, invalidate all symbols
+ // registered with the interner.
+ Symbol::invalidate_all();
+ buf
+}
+
+impl Client<crate::TokenStream, crate::TokenStream> {
+ pub const fn expand1(f: impl Fn(crate::TokenStream) -> crate::TokenStream + Copy) -> Self {
+ Client {
+ get_handle_counters: HandleCounters::get,
+ run: super::selfless_reify::reify_to_extern_c_fn_hrt_bridge(move |bridge| {
+ run_client(bridge, |input| f(crate::TokenStream(Some(input))).0)
+ }),
+ _marker: PhantomData,
+ }
+ }
+}
+
+impl Client<(crate::TokenStream, crate::TokenStream), crate::TokenStream> {
+ pub const fn expand2(
+ f: impl Fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream + Copy,
+ ) -> Self {
+ Client {
+ get_handle_counters: HandleCounters::get,
+ run: super::selfless_reify::reify_to_extern_c_fn_hrt_bridge(move |bridge| {
+ run_client(bridge, |(input, input2)| {
+ f(crate::TokenStream(Some(input)), crate::TokenStream(Some(input2))).0
+ })
+ }),
+ _marker: PhantomData,
+ }
+ }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub enum ProcMacro {
+ CustomDerive {
+ trait_name: &'static str,
+ attributes: &'static [&'static str],
+ client: Client<crate::TokenStream, crate::TokenStream>,
+ },
+
+ Attr {
+ name: &'static str,
+ client: Client<(crate::TokenStream, crate::TokenStream), crate::TokenStream>,
+ },
+
+ Bang {
+ name: &'static str,
+ client: Client<crate::TokenStream, crate::TokenStream>,
+ },
+}
+
+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 const fn custom_derive(
+ trait_name: &'static str,
+ attributes: &'static [&'static str],
+ expand: impl Fn(crate::TokenStream) -> crate::TokenStream + Copy,
+ ) -> Self {
+ ProcMacro::CustomDerive { trait_name, attributes, client: Client::expand1(expand) }
+ }
+
+ pub const fn attr(
+ name: &'static str,
+ expand: impl Fn(crate::TokenStream, crate::TokenStream) -> crate::TokenStream + Copy,
+ ) -> Self {
+ ProcMacro::Attr { name, client: Client::expand2(expand) }
+ }
+
+ pub const fn bang(
+ name: &'static str,
+ expand: impl Fn(crate::TokenStream) -> crate::TokenStream + Copy,
+ ) -> Self {
+ ProcMacro::Bang { name, client: Client::expand1(expand) }
+ }
+}
diff --git a/library/proc_macro/src/bridge/closure.rs b/library/proc_macro/src/bridge/closure.rs
new file mode 100644
index 000000000..d371ae3ce
--- /dev/null
+++ b/library/proc_macro/src/bridge/closure.rs
@@ -0,0 +1,32 @@
+//! Closure type (equivalent to `&mut dyn FnMut(A) -> R`) that's `repr(C)`.
+
+use std::marker::PhantomData;
+
+#[repr(C)]
+pub struct Closure<'a, A, R> {
+ call: unsafe extern "C" fn(*mut Env, A) -> R,
+ env: *mut Env,
+ // Prevent Send and Sync impls. `!Send`/`!Sync` is the usual way of doing
+ // this, but that requires unstable features. rust-analyzer uses this code
+ // and avoids unstable features.
+ //
+ // The `'a` lifetime parameter represents the lifetime of `Env`.
+ _marker: PhantomData<*mut &'a mut ()>,
+}
+
+struct Env;
+
+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: f as *mut _ as *mut Env, _marker: PhantomData }
+ }
+}
+
+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/library/proc_macro/src/bridge/fxhash.rs b/library/proc_macro/src/bridge/fxhash.rs
new file mode 100644
index 000000000..4b1e412e2
--- /dev/null
+++ b/library/proc_macro/src/bridge/fxhash.rs
@@ -0,0 +1,117 @@
+//! This is a copy of the `rustc_hash` crate, adapted to work as a module.
+//!
+//! If in the future it becomes more reasonable to add dependencies to
+//! `proc_macro`, this module should be removed and replaced with a dependency
+//! on the `rustc_hash` crate.
+
+use std::collections::HashMap;
+use std::convert::TryInto;
+use std::default::Default;
+use std::hash::BuildHasherDefault;
+use std::hash::Hasher;
+use std::mem::size_of;
+use std::ops::BitXor;
+
+/// Type alias for a hashmap using the `fx` hash algorithm.
+pub type FxHashMap<K, V> = HashMap<K, V, BuildHasherDefault<FxHasher>>;
+
+/// A speedy hash algorithm for use within rustc. The hashmap in liballoc
+/// by default uses SipHash which isn't quite as speedy as we want. In the
+/// compiler we're not really worried about DOS attempts, so we use a fast
+/// non-cryptographic hash.
+///
+/// This is the same as the algorithm used by Firefox -- which is a homespun
+/// one not based on any widely-known algorithm -- though modified to produce
+/// 64-bit hash values instead of 32-bit hash values. It consistently
+/// out-performs an FNV-based hash within rustc itself -- the collision rate is
+/// similar or slightly worse than FNV, but the speed of the hash function
+/// itself is much higher because it works on up to 8 bytes at a time.
+pub struct FxHasher {
+ hash: usize,
+}
+
+#[cfg(target_pointer_width = "32")]
+const K: usize = 0x9e3779b9;
+#[cfg(target_pointer_width = "64")]
+const K: usize = 0x517cc1b727220a95;
+
+impl Default for FxHasher {
+ #[inline]
+ fn default() -> FxHasher {
+ FxHasher { hash: 0 }
+ }
+}
+
+impl FxHasher {
+ #[inline]
+ fn add_to_hash(&mut self, i: usize) {
+ self.hash = self.hash.rotate_left(5).bitxor(i).wrapping_mul(K);
+ }
+}
+
+impl Hasher for FxHasher {
+ #[inline]
+ fn write(&mut self, mut bytes: &[u8]) {
+ #[cfg(target_pointer_width = "32")]
+ let read_usize = |bytes: &[u8]| u32::from_ne_bytes(bytes[..4].try_into().unwrap());
+ #[cfg(target_pointer_width = "64")]
+ let read_usize = |bytes: &[u8]| u64::from_ne_bytes(bytes[..8].try_into().unwrap());
+
+ let mut hash = FxHasher { hash: self.hash };
+ assert!(size_of::<usize>() <= 8);
+ while bytes.len() >= size_of::<usize>() {
+ hash.add_to_hash(read_usize(bytes) as usize);
+ bytes = &bytes[size_of::<usize>()..];
+ }
+ if (size_of::<usize>() > 4) && (bytes.len() >= 4) {
+ hash.add_to_hash(u32::from_ne_bytes(bytes[..4].try_into().unwrap()) as usize);
+ bytes = &bytes[4..];
+ }
+ if (size_of::<usize>() > 2) && bytes.len() >= 2 {
+ hash.add_to_hash(u16::from_ne_bytes(bytes[..2].try_into().unwrap()) as usize);
+ bytes = &bytes[2..];
+ }
+ if (size_of::<usize>() > 1) && bytes.len() >= 1 {
+ hash.add_to_hash(bytes[0] as usize);
+ }
+ self.hash = hash.hash;
+ }
+
+ #[inline]
+ fn write_u8(&mut self, i: u8) {
+ self.add_to_hash(i as usize);
+ }
+
+ #[inline]
+ fn write_u16(&mut self, i: u16) {
+ self.add_to_hash(i as usize);
+ }
+
+ #[inline]
+ fn write_u32(&mut self, i: u32) {
+ self.add_to_hash(i as usize);
+ }
+
+ #[cfg(target_pointer_width = "32")]
+ #[inline]
+ fn write_u64(&mut self, i: u64) {
+ self.add_to_hash(i as usize);
+ self.add_to_hash((i >> 32) as usize);
+ }
+
+ #[cfg(target_pointer_width = "64")]
+ #[inline]
+ fn write_u64(&mut self, i: u64) {
+ self.add_to_hash(i as usize);
+ }
+
+ #[inline]
+ fn write_usize(&mut self, i: usize) {
+ self.add_to_hash(i);
+ }
+
+ #[inline]
+ fn finish(&self) -> u64 {
+ self.hash as u64
+ }
+}
diff --git a/library/proc_macro/src/bridge/handle.rs b/library/proc_macro/src/bridge/handle.rs
new file mode 100644
index 000000000..00954107b
--- /dev/null
+++ b/library/proc_macro/src/bridge/handle.rs
@@ -0,0 +1,75 @@
+//! Server-side handles and storage for per-handle data.
+
+use std::collections::BTreeMap;
+use std::hash::Hash;
+use std::num::NonZeroU32;
+use std::ops::{Index, IndexMut};
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+use super::fxhash::FxHashMap;
+
+pub(super) type Handle = NonZeroU32;
+
+/// A store that associates values of type `T` with numeric handles. A value can
+/// be looked up using its handle.
+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")
+ }
+}
+
+/// Like `OwnedStore`, but avoids storing any value more than once.
+pub(super) struct InternedStore<T: 'static> {
+ owned: OwnedStore<T>,
+ interner: FxHashMap<T, Handle>,
+}
+
+impl<T: Copy + Eq + Hash> InternedStore<T> {
+ pub(super) fn new(counter: &'static AtomicUsize) -> Self {
+ InternedStore { owned: OwnedStore::new(counter), interner: FxHashMap::default() }
+ }
+
+ 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/library/proc_macro/src/bridge/mod.rs b/library/proc_macro/src/bridge/mod.rs
new file mode 100644
index 000000000..5cde966bf
--- /dev/null
+++ b/library/proc_macro/src/bridge/mod.rs
@@ -0,0 +1,524 @@
+//! 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)]
+
+use crate::{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) => {
+ $m! {
+ FreeFunctions {
+ fn drop($self: $S::FreeFunctions);
+ fn track_env_var(var: &str, value: Option<&str>);
+ fn track_path(path: &str);
+ fn literal_from_str(s: &str) -> Result<Literal<$S::Span, $S::Symbol>, ()>;
+ },
+ TokenStream {
+ fn drop($self: $S::TokenStream);
+ fn clone($self: &$S::TokenStream) -> $S::TokenStream;
+ fn is_empty($self: &$S::TokenStream) -> bool;
+ fn expand_expr($self: &$S::TokenStream) -> Result<$S::TokenStream, ()>;
+ fn from_str(src: &str) -> $S::TokenStream;
+ fn to_string($self: &$S::TokenStream) -> String;
+ fn from_token_tree(
+ tree: TokenTree<$S::TokenStream, $S::Span, $S::Symbol>,
+ ) -> $S::TokenStream;
+ fn concat_trees(
+ base: Option<$S::TokenStream>,
+ trees: Vec<TokenTree<$S::TokenStream, $S::Span, $S::Symbol>>,
+ ) -> $S::TokenStream;
+ fn concat_streams(
+ base: Option<$S::TokenStream>,
+ streams: Vec<$S::TokenStream>,
+ ) -> $S::TokenStream;
+ fn into_trees(
+ $self: $S::TokenStream
+ ) -> Vec<TokenTree<$S::TokenStream, $S::Span, $S::Symbol>>;
+ },
+ SourceFile {
+ fn drop($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: $S::Span) -> String;
+ fn source_file($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: $S::Span) -> LineColumn;
+ fn before($self: $S::Span) -> $S::Span;
+ fn after($self: $S::Span) -> $S::Span;
+ fn join($self: $S::Span, other: $S::Span) -> Option<$S::Span>;
+ fn subspan($self: $S::Span, start: Bound<usize>, end: Bound<usize>) -> Option<$S::Span>;
+ fn resolved_at($self: $S::Span, at: $S::Span) -> $S::Span;
+ fn source_text($self: $S::Span) -> Option<String>;
+ fn save_span($self: $S::Span) -> usize;
+ fn recover_proc_macro_span(id: usize) -> $S::Span;
+ },
+ Symbol {
+ fn normalize_and_validate_ident(string: &str) -> Result<$S::Symbol, ()>;
+ },
+ }
+ };
+}
+
+// FIXME(eddyb) this calls `encode` for each argument, but in reverse,
+// to match the ordering in `reverse_decode`.
+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, $s);
+ }
+}
+
+#[allow(unsafe_code)]
+mod arena;
+#[allow(unsafe_code)]
+mod buffer;
+#[forbid(unsafe_code)]
+pub mod client;
+#[allow(unsafe_code)]
+mod closure;
+#[forbid(unsafe_code)]
+mod fxhash;
+#[forbid(unsafe_code)]
+mod handle;
+#[macro_use]
+#[forbid(unsafe_code)]
+mod rpc;
+#[allow(unsafe_code)]
+mod scoped_cell;
+#[allow(unsafe_code)]
+mod selfless_reify;
+#[forbid(unsafe_code)]
+pub mod server;
+#[allow(unsafe_code)]
+mod symbol;
+
+use buffer::Buffer;
+pub use rpc::PanicMessage;
+use rpc::{Decode, DecodeMut, Encode, Reader, Writer};
+
+/// Configuration for establishing an active connection between a server and a
+/// client. The server creates the bridge config (`run_server` in `server.rs`),
+/// then passes it to the client through the function pointer in the `run` field
+/// of `client::Client`. The client constructs a local `Bridge` from the config
+/// in TLS during its execution (`Bridge::{enter, with}` in `client.rs`).
+#[repr(C)]
+pub struct BridgeConfig<'a> {
+ /// Buffer used to pass initial input to the client.
+ input: Buffer,
+
+ /// Server-side function that the client uses to make requests.
+ dispatch: closure::Closure<'a, Buffer, Buffer>,
+
+ /// If 'true', always invoke the default panic hook
+ force_show_panics: bool,
+
+ // Prevent Send and Sync impls. `!Send`/`!Sync` is the usual way of doing
+ // this, but that requires unstable features. rust-analyzer uses this code
+ // and avoids unstable features.
+ _marker: marker::PhantomData<*mut ()>,
+}
+
+#[forbid(unsafe_code)]
+#[allow(non_camel_case_types)]
+mod api_tags {
+ use super::rpc::{DecodeMut, Encode, Reader, Writer};
+
+ macro_rules! declare_tags {
+ ($($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 Vec<T> {
+ type Unmarked = Vec<T::Unmarked>;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ // Should be a no-op due to std's in-place collect optimizations.
+ unmarked.into_iter().map(T::mark).collect()
+ }
+}
+impl<T: Unmark> Unmark for Vec<T> {
+ type Unmarked = Vec<T::Unmarked>;
+ fn unmark(self) -> Self::Unmarked {
+ // Should be a no-op due to std's in-place collect optimizations.
+ self.into_iter().map(T::unmark).collect()
+ }
+}
+
+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,
+ u8,
+ usize,
+ Delimiter,
+ LitKind,
+ Level,
+ LineColumn,
+ Spacing,
+}
+
+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(Copy, Clone, Eq, PartialEq, Debug)]
+pub enum LitKind {
+ Byte,
+ Char,
+ Integer,
+ Float,
+ Str,
+ StrRaw(u8),
+ ByteStr,
+ ByteStrRaw(u8),
+ Err,
+}
+
+rpc_encode_decode!(
+ enum LitKind {
+ Byte,
+ Char,
+ Integer,
+ Float,
+ Str,
+ StrRaw(n),
+ ByteStr,
+ ByteStrRaw(n),
+ Err,
+ }
+);
+
+macro_rules! mark_compound {
+ (struct $name:ident <$($T:ident),+> { $($field:ident),* $(,)? }) => {
+ impl<$($T: Mark),+> Mark for $name <$($T),+> {
+ type Unmarked = $name <$($T::Unmarked),+>;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ $name {
+ $($field: Mark::mark(unmarked.$field)),*
+ }
+ }
+ }
+
+ impl<$($T: Unmark),+> Unmark for $name <$($T),+> {
+ type Unmarked = $name <$($T::Unmarked),+>;
+ fn unmark(self) -> Self::Unmarked {
+ $name {
+ $($field: Unmark::unmark(self.$field)),*
+ }
+ }
+ }
+ };
+ (enum $name:ident <$($T:ident),+> { $($variant:ident $(($field:ident))?),* $(,)? }) => {
+ impl<$($T: Mark),+> Mark for $name <$($T),+> {
+ type Unmarked = $name <$($T::Unmarked),+>;
+ fn mark(unmarked: Self::Unmarked) -> Self {
+ match unmarked {
+ $($name::$variant $(($field))? => {
+ $name::$variant $((Mark::mark($field)))?
+ })*
+ }
+ }
+ }
+
+ impl<$($T: Unmark),+> Unmark for $name <$($T),+> {
+ type Unmarked = $name <$($T::Unmarked),+>;
+ fn unmark(self) -> Self::Unmarked {
+ match self {
+ $($name::$variant $(($field))? => {
+ $name::$variant $((Unmark::unmark($field)))?
+ })*
+ }
+ }
+ }
+ }
+}
+
+macro_rules! compound_traits {
+ ($($t:tt)*) => {
+ rpc_encode_decode!($($t)*);
+ mark_compound!($($t)*);
+ };
+}
+
+compound_traits!(
+ enum Bound<T> {
+ Included(x),
+ Excluded(x),
+ Unbounded,
+ }
+);
+
+compound_traits!(
+ enum Option<T> {
+ Some(t),
+ None,
+ }
+);
+
+compound_traits!(
+ enum Result<T, E> {
+ Ok(t),
+ Err(e),
+ }
+);
+
+#[derive(Copy, Clone)]
+pub struct DelimSpan<Span> {
+ pub open: Span,
+ pub close: Span,
+ pub entire: Span,
+}
+
+impl<Span: Copy> DelimSpan<Span> {
+ pub fn from_single(span: Span) -> Self {
+ DelimSpan { open: span, close: span, entire: span }
+ }
+}
+
+compound_traits!(struct DelimSpan<Span> { open, close, entire });
+
+#[derive(Clone)]
+pub struct Group<TokenStream, Span> {
+ pub delimiter: Delimiter,
+ pub stream: Option<TokenStream>,
+ pub span: DelimSpan<Span>,
+}
+
+compound_traits!(struct Group<TokenStream, Span> { delimiter, stream, span });
+
+#[derive(Clone)]
+pub struct Punct<Span> {
+ pub ch: u8,
+ pub joint: bool,
+ pub span: Span,
+}
+
+compound_traits!(struct Punct<Span> { ch, joint, span });
+
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub struct Ident<Span, Symbol> {
+ pub sym: Symbol,
+ pub is_raw: bool,
+ pub span: Span,
+}
+
+compound_traits!(struct Ident<Span, Symbol> { sym, is_raw, span });
+
+#[derive(Clone, Eq, PartialEq)]
+pub struct Literal<Span, Symbol> {
+ pub kind: LitKind,
+ pub symbol: Symbol,
+ pub suffix: Option<Symbol>,
+ pub span: Span,
+}
+
+compound_traits!(struct Literal<Sp, Sy> { kind, symbol, suffix, span });
+
+#[derive(Clone)]
+pub enum TokenTree<TokenStream, Span, Symbol> {
+ Group(Group<TokenStream, Span>),
+ Punct(Punct<Span>),
+ Ident(Ident<Span, Symbol>),
+ Literal(Literal<Span, Symbol>),
+}
+
+compound_traits!(
+ enum TokenTree<TokenStream, Span, Symbol> {
+ Group(tt),
+ Punct(tt),
+ Ident(tt),
+ Literal(tt),
+ }
+);
+
+/// Globals provided alongside the initial inputs for a macro expansion.
+/// Provides values such as spans which are used frequently to avoid RPC.
+#[derive(Clone)]
+pub struct ExpnGlobals<Span> {
+ pub def_site: Span,
+ pub call_site: Span,
+ pub mixed_site: Span,
+}
+
+compound_traits!(
+ struct ExpnGlobals<Span> { def_site, call_site, mixed_site }
+);
diff --git a/library/proc_macro/src/bridge/rpc.rs b/library/proc_macro/src/bridge/rpc.rs
new file mode 100644
index 000000000..e9d7a46c0
--- /dev/null
+++ b/library/proc_macro/src/bridge/rpc.rs
@@ -0,0 +1,304 @@
+//! Serialization for client-server communication.
+
+use std::any::Any;
+use std::char;
+use std::io::Write;
+use std::num::NonZeroU32;
+use std::str;
+
+pub(super) type Writer = super::buffer::Buffer;
+
+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.extend_from_array(&self.to_le_bytes());
+ }
+ }
+
+ 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 $(<$($T:ident),+>)? { $($field:ident),* $(,)? }) => {
+ impl<S, $($($T: Encode<S>),+)?> Encode<S> for $name $(<$($T),+>)? {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ $(self.$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 {
+ $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.push(self);
+ }
+}
+
+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))
+ }
+}
+
+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()
+ }
+}
+
+impl<S, T: Encode<S>> Encode<S> for Vec<T> {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.len().encode(w, s);
+ for x in self {
+ x.encode(w, s);
+ }
+ }
+}
+
+impl<'a, S, T: for<'s> DecodeMut<'a, 's, S>> DecodeMut<'a, '_, S> for Vec<T> {
+ fn decode(r: &mut Reader<'a>, s: &mut S) -> Self {
+ let len = usize::decode(r, s);
+ let mut vec = Vec::with_capacity(len);
+ for _ in 0..len {
+ vec.push(T::decode(r, s));
+ }
+ vec
+ }
+}
+
+/// Simplified version of panic payloads, ignoring
+/// types other than `&'static str` and `String`.
+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/library/proc_macro/src/bridge/scoped_cell.rs b/library/proc_macro/src/bridge/scoped_cell.rs
new file mode 100644
index 000000000..2cde1f65a
--- /dev/null
+++ b/library/proc_macro/src/bridge/scoped_cell.rs
@@ -0,0 +1,81 @@
+//! `Cell` variant for (scoped) existential lifetimes.
+
+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 const 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/library/proc_macro/src/bridge/selfless_reify.rs b/library/proc_macro/src/bridge/selfless_reify.rs
new file mode 100644
index 000000000..907ad256e
--- /dev/null
+++ b/library/proc_macro/src/bridge/selfless_reify.rs
@@ -0,0 +1,84 @@
+//! Abstraction for creating `fn` pointers from any callable that *effectively*
+//! has the equivalent of implementing `Default`, even if the compiler neither
+//! provides `Default` nor allows reifying closures (i.e. creating `fn` pointers)
+//! other than those with absolutely no captures.
+//!
+//! More specifically, for a closure-like type to be "effectively `Default`":
+//! * it must be a ZST (zero-sized type): no information contained within, so
+//! that `Default`'s return value (if it were implemented) is unambiguous
+//! * it must be `Copy`: no captured "unique ZST tokens" or any other similar
+//! types that would make duplicating values at will unsound
+//! * combined with the ZST requirement, this confers a kind of "telecopy"
+//! ability: similar to `Copy`, but without keeping the value around, and
+//! instead "reconstructing" it (a noop given it's a ZST) when needed
+//! * it must be *provably* inhabited: no captured uninhabited types or any
+//! other types that cannot be constructed by the user of this abstraction
+//! * the proof is a value of the closure-like type itself, in a sense the
+//! "seed" for the "telecopy" process made possible by ZST + `Copy`
+//! * this requirement is the only reason an abstraction limited to a specific
+//! usecase is required: ZST + `Copy` can be checked with *at worst* a panic
+//! at the "attempted `::default()` call" time, but that doesn't guarantee
+//! that the value can be soundly created, and attempting to use the typical
+//! "proof ZST token" approach leads yet again to having a ZST + `Copy` type
+//! that is not proof of anything without a value (i.e. isomorphic to a
+//! newtype of the type it's trying to prove the inhabitation of)
+//!
+//! A more flexible (and safer) solution to the general problem could exist once
+//! `const`-generic parameters can have type parameters in their types:
+//!
+//! ```rust,ignore (needs future const-generics)
+//! extern "C" fn ffi_wrapper<
+//! A, R,
+//! F: Fn(A) -> R,
+//! const f: F, // <-- this `const`-generic is not yet allowed
+//! >(arg: A) -> R {
+//! f(arg)
+//! }
+//! ```
+
+use std::mem;
+
+// FIXME(eddyb) this could be `trait` impls except for the `const fn` requirement.
+macro_rules! define_reify_functions {
+ ($(
+ fn $name:ident $(<$($param:ident),*>)?
+ for $(extern $abi:tt)? fn($($arg:ident: $arg_ty:ty),*) -> $ret_ty:ty;
+ )+) => {
+ $(pub const fn $name<
+ $($($param,)*)?
+ F: Fn($($arg_ty),*) -> $ret_ty + Copy
+ >(f: F) -> $(extern $abi)? fn($($arg_ty),*) -> $ret_ty {
+ // FIXME(eddyb) describe the `F` type (e.g. via `type_name::<F>`) once panic
+ // formatting becomes possible in `const fn`.
+ assert!(mem::size_of::<F>() == 0, "selfless_reify: closure must be zero-sized");
+
+ $(extern $abi)? fn wrapper<
+ $($($param,)*)?
+ F: Fn($($arg_ty),*) -> $ret_ty + Copy
+ >($($arg: $arg_ty),*) -> $ret_ty {
+ let f = unsafe {
+ // SAFETY: `F` satisfies all criteria for "out of thin air"
+ // reconstructability (see module-level doc comment).
+ mem::MaybeUninit::<F>::uninit().assume_init()
+ };
+ f($($arg),*)
+ }
+ let _f_proof = f;
+ wrapper::<
+ $($($param,)*)?
+ F
+ >
+ })+
+ }
+}
+
+define_reify_functions! {
+ fn _reify_to_extern_c_fn_unary<A, R> for extern "C" fn(arg: A) -> R;
+
+ // HACK(eddyb) this abstraction is used with `for<'a> fn(BridgeConfig<'a>)
+ // -> T` but that doesn't work with just `reify_to_extern_c_fn_unary`
+ // because of the `fn` pointer type being "higher-ranked" (i.e. the
+ // `for<'a>` binder).
+ // FIXME(eddyb) try to remove the lifetime from `BridgeConfig`, that'd help.
+ fn reify_to_extern_c_fn_hrt_bridge<R> for extern "C" fn(bridge: super::BridgeConfig<'_>) -> R;
+}
diff --git a/library/proc_macro/src/bridge/server.rs b/library/proc_macro/src/bridge/server.rs
new file mode 100644
index 000000000..e068ec60b
--- /dev/null
+++ b/library/proc_macro/src/bridge/server.rs
@@ -0,0 +1,339 @@
+//! Server-side traits.
+
+use super::*;
+
+use std::marker::PhantomData;
+
+// FIXME(eddyb) generate the definition of `HandleStore` in `server.rs`.
+use super::client::HandleStore;
+
+pub trait Types {
+ type FreeFunctions: 'static;
+ type TokenStream: 'static + Clone;
+ type SourceFile: 'static + Clone;
+ type MultiSpan: 'static;
+ type Diagnostic: 'static;
+ type Span: 'static + Copy + Eq + Hash;
+ type Symbol: 'static;
+}
+
+/// Declare an associated fn of one of the traits below, adding necessary
+/// default bodies.
+macro_rules! associated_fn {
+ (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 $name: Types {
+ $(associated_fn!(fn $method(&mut self, $($arg: $arg_ty),*) $(-> $ret_ty)?);)*
+ })*
+
+ pub trait Server: Types $(+ $name)* {
+ fn globals(&mut self) -> ExpnGlobals<Self::Span>;
+
+ /// Intern a symbol received from RPC
+ fn intern_symbol(ident: &str) -> Self::Symbol;
+
+ /// Recover the string value of a symbol, and invoke a callback with it.
+ fn with_symbol_string(symbol: &Self::Symbol, f: impl FnOnce(&str));
+ }
+ }
+}
+with_api!(Self, self_, declare_server_traits);
+
+pub(super) struct MarkedTypes<S: Types>(S);
+
+impl<S: Server> Server for MarkedTypes<S> {
+ fn globals(&mut self) -> ExpnGlobals<Self::Span> {
+ <_>::mark(Server::globals(&mut self.0))
+ }
+ fn intern_symbol(ident: &str) -> Self::Symbol {
+ <_>::mark(S::intern_symbol(ident))
+ }
+ fn with_symbol_string(symbol: &Self::Symbol, f: impl FnOnce(&str)) {
+ S::with_symbol_string(symbol.unmark(), f)
+ }
+}
+
+macro_rules! define_mark_types_impls {
+ ($($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, buf: Buffer) -> Buffer;
+ }
+
+ impl<S: Server> DispatcherTrait for Dispatcher<MarkedTypes<S>> {
+ $(type $name = <MarkedTypes<S> as Types>::$name;)*
+
+ fn dispatch(&mut self, mut buf: Buffer) -> Buffer {
+ let Dispatcher { handle_store, server } = self;
+
+ let mut reader = &buf[..];
+ 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)
+ };
+
+ buf.clear();
+ r.encode(&mut buf, handle_store);
+ })*
+ }),*
+ }
+ buf
+ }
+ }
+ }
+}
+with_api!(Self, self_, define_dispatcher_impl);
+
+pub trait ExecutionStrategy {
+ fn run_bridge_and_client(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer,
+ run_client: extern "C" fn(BridgeConfig<'_>) -> Buffer,
+ force_show_panics: bool,
+ ) -> Buffer;
+}
+
+pub struct MaybeCrossThread<P> {
+ cross_thread: bool,
+ marker: PhantomData<P>,
+}
+
+impl<P> MaybeCrossThread<P> {
+ pub const fn new(cross_thread: bool) -> Self {
+ MaybeCrossThread { cross_thread, marker: PhantomData }
+ }
+}
+
+impl<P> ExecutionStrategy for MaybeCrossThread<P>
+where
+ P: MessagePipe<Buffer> + Send + 'static,
+{
+ fn run_bridge_and_client(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer,
+ run_client: extern "C" fn(BridgeConfig<'_>) -> Buffer,
+ force_show_panics: bool,
+ ) -> Buffer {
+ if self.cross_thread {
+ <CrossThread<P>>::new().run_bridge_and_client(
+ dispatcher,
+ input,
+ run_client,
+ force_show_panics,
+ )
+ } else {
+ SameThread.run_bridge_and_client(dispatcher, input, run_client, force_show_panics)
+ }
+ }
+}
+
+pub struct SameThread;
+
+impl ExecutionStrategy for SameThread {
+ fn run_bridge_and_client(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer,
+ run_client: extern "C" fn(BridgeConfig<'_>) -> Buffer,
+ force_show_panics: bool,
+ ) -> Buffer {
+ let mut dispatch = |buf| dispatcher.dispatch(buf);
+
+ run_client(BridgeConfig {
+ input,
+ dispatch: (&mut dispatch).into(),
+ force_show_panics,
+ _marker: marker::PhantomData,
+ })
+ }
+}
+
+pub struct CrossThread<P>(PhantomData<P>);
+
+impl<P> CrossThread<P> {
+ pub const fn new() -> Self {
+ CrossThread(PhantomData)
+ }
+}
+
+impl<P> ExecutionStrategy for CrossThread<P>
+where
+ P: MessagePipe<Buffer> + Send + 'static,
+{
+ fn run_bridge_and_client(
+ &self,
+ dispatcher: &mut impl DispatcherTrait,
+ input: Buffer,
+ run_client: extern "C" fn(BridgeConfig<'_>) -> Buffer,
+ force_show_panics: bool,
+ ) -> Buffer {
+ let (mut server, mut client) = P::new();
+
+ let join_handle = thread::spawn(move || {
+ let mut dispatch = |b: Buffer| -> Buffer {
+ client.send(b);
+ client.recv().expect("server died while client waiting for reply")
+ };
+
+ run_client(BridgeConfig {
+ input,
+ dispatch: (&mut dispatch).into(),
+ force_show_panics,
+ _marker: marker::PhantomData,
+ })
+ });
+
+ while let Some(b) = server.recv() {
+ server.send(dispatcher.dispatch(b));
+ }
+
+ join_handle.join().unwrap()
+ }
+}
+
+/// A message pipe used for communicating between server and client threads.
+pub trait MessagePipe<T>: Sized {
+ /// Create a new pair of endpoints for the message pipe.
+ fn new() -> (Self, Self);
+
+ /// Send a message to the other endpoint of this pipe.
+ fn send(&mut self, value: T);
+
+ /// Receive a message from the other endpoint of this pipe.
+ ///
+ /// Returns `None` if the other end of the pipe has been destroyed, and no
+ /// message was received.
+ fn recv(&mut self) -> Option<T>;
+}
+
+fn run_server<
+ S: Server,
+ I: Encode<HandleStore<MarkedTypes<S>>>,
+ O: for<'a, 's> DecodeMut<'a, 's, HandleStore<MarkedTypes<S>>>,
+>(
+ strategy: &impl ExecutionStrategy,
+ handle_counters: &'static client::HandleCounters,
+ server: S,
+ input: I,
+ run_client: extern "C" fn(BridgeConfig<'_>) -> Buffer,
+ force_show_panics: bool,
+) -> Result<O, PanicMessage> {
+ let mut dispatcher =
+ Dispatcher { handle_store: HandleStore::new(handle_counters), server: MarkedTypes(server) };
+
+ let globals = dispatcher.server.globals();
+
+ let mut buf = Buffer::new();
+ (globals, input).encode(&mut buf, &mut dispatcher.handle_store);
+
+ buf = strategy.run_bridge_and_client(&mut dispatcher, buf, run_client, force_show_panics);
+
+ Result::decode(&mut &buf[..], &mut dispatcher.handle_store)
+}
+
+impl client::Client<crate::TokenStream, crate::TokenStream> {
+ pub fn run<S>(
+ &self,
+ strategy: &impl ExecutionStrategy,
+ server: S,
+ input: S::TokenStream,
+ force_show_panics: bool,
+ ) -> Result<S::TokenStream, PanicMessage>
+ where
+ S: Server,
+ S::TokenStream: Default,
+ {
+ let client::Client { get_handle_counters, run, _marker } = *self;
+ run_server(
+ strategy,
+ get_handle_counters(),
+ server,
+ <MarkedTypes<S> as Types>::TokenStream::mark(input),
+ run,
+ force_show_panics,
+ )
+ .map(|s| <Option<<MarkedTypes<S> as Types>::TokenStream>>::unmark(s).unwrap_or_default())
+ }
+}
+
+impl client::Client<(crate::TokenStream, crate::TokenStream), crate::TokenStream> {
+ pub fn run<S>(
+ &self,
+ strategy: &impl ExecutionStrategy,
+ server: S,
+ input: S::TokenStream,
+ input2: S::TokenStream,
+ force_show_panics: bool,
+ ) -> Result<S::TokenStream, PanicMessage>
+ where
+ S: Server,
+ S::TokenStream: Default,
+ {
+ let client::Client { get_handle_counters, run, _marker } = *self;
+ run_server(
+ strategy,
+ get_handle_counters(),
+ server,
+ (
+ <MarkedTypes<S> as Types>::TokenStream::mark(input),
+ <MarkedTypes<S> as Types>::TokenStream::mark(input2),
+ ),
+ run,
+ force_show_panics,
+ )
+ .map(|s| <Option<<MarkedTypes<S> as Types>::TokenStream>>::unmark(s).unwrap_or_default())
+ }
+}
diff --git a/library/proc_macro/src/bridge/symbol.rs b/library/proc_macro/src/bridge/symbol.rs
new file mode 100644
index 000000000..930c11145
--- /dev/null
+++ b/library/proc_macro/src/bridge/symbol.rs
@@ -0,0 +1,205 @@
+//! Client-side interner used for symbols.
+//!
+//! This is roughly based on the symbol interner from `rustc_span` and the
+//! DroplessArena from `rustc_arena`. It is unfortunately a complete
+//! copy/re-implementation rather than a dependency as it is difficult to depend
+//! on crates from within `proc_macro`, due to it being built at the same time
+//! as `std`.
+//!
+//! If at some point in the future it becomes easier to add dependencies to
+//! proc_macro, this module should probably be removed or simplified.
+
+use std::cell::RefCell;
+use std::num::NonZeroU32;
+use std::str;
+
+use super::*;
+
+/// Handle for a symbol string stored within the Interner.
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+pub struct Symbol(NonZeroU32);
+
+impl !Send for Symbol {}
+impl !Sync for Symbol {}
+
+impl Symbol {
+ /// Intern a new `Symbol`
+ pub(crate) fn new(string: &str) -> Self {
+ INTERNER.with_borrow_mut(|i| i.intern(string))
+ }
+
+ /// Create a new `Symbol` for an identifier.
+ ///
+ /// Validates and normalizes before converting it to a symbol.
+ pub(crate) fn new_ident(string: &str, is_raw: bool) -> Self {
+ // Fast-path: check if this is a valid ASCII identifier
+ if Self::is_valid_ascii_ident(string.as_bytes()) {
+ if is_raw && !Self::can_be_raw(string) {
+ panic!("`{}` cannot be a raw identifier", string);
+ }
+ return Self::new(string);
+ }
+
+ // Slow-path: If the string is already ASCII we're done, otherwise ask
+ // our server to do this for us over RPC.
+ // We don't need to check for identifiers which can't be raw here,
+ // because all of them are ASCII.
+ if string.is_ascii() {
+ Err(())
+ } else {
+ client::Symbol::normalize_and_validate_ident(string)
+ }
+ .unwrap_or_else(|_| panic!("`{:?}` is not a valid identifier", string))
+ }
+
+ /// Run a callback with the symbol's string value.
+ pub(crate) fn with<R>(self, f: impl FnOnce(&str) -> R) -> R {
+ INTERNER.with_borrow(|i| f(i.get(self)))
+ }
+
+ /// Clear out the thread-local symbol interner, making all previously
+ /// created symbols invalid such that `with` will panic when called on them.
+ pub(crate) fn invalidate_all() {
+ INTERNER.with_borrow_mut(|i| i.clear());
+ }
+
+ /// Check if the ident is a valid ASCII identifier.
+ ///
+ /// This is a short-circuit which is cheap to implement within the
+ /// proc-macro client to avoid RPC when creating simple idents, but may
+ /// return `false` for a valid identifier if it contains non-ASCII
+ /// characters.
+ fn is_valid_ascii_ident(bytes: &[u8]) -> bool {
+ matches!(bytes.first(), Some(b'_' | b'a'..=b'z' | b'A'..=b'Z'))
+ && bytes[1..]
+ .iter()
+ .all(|b| matches!(b, b'_' | b'a'..=b'z' | b'A'..=b'Z' | b'0'..=b'9'))
+ }
+
+ // Mimics the behaviour of `Symbol::can_be_raw` from `rustc_span`
+ fn can_be_raw(string: &str) -> bool {
+ match string {
+ "_" | "super" | "self" | "Self" | "crate" => false,
+ _ => true,
+ }
+ }
+}
+
+impl fmt::Debug for Symbol {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.with(|s| fmt::Debug::fmt(s, f))
+ }
+}
+
+impl ToString for Symbol {
+ fn to_string(&self) -> String {
+ self.with(|s| s.to_owned())
+ }
+}
+
+impl fmt::Display for Symbol {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.with(|s| fmt::Display::fmt(s, f))
+ }
+}
+
+impl<S> Encode<S> for Symbol {
+ fn encode(self, w: &mut Writer, s: &mut S) {
+ self.with(|sym| sym.encode(w, s))
+ }
+}
+
+impl<S: server::Server> DecodeMut<'_, '_, client::HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::Symbol, Symbol>
+{
+ fn decode(r: &mut Reader<'_>, s: &mut client::HandleStore<server::MarkedTypes<S>>) -> Self {
+ Mark::mark(S::intern_symbol(<&str>::decode(r, s)))
+ }
+}
+
+impl<S: server::Server> Encode<client::HandleStore<server::MarkedTypes<S>>>
+ for Marked<S::Symbol, Symbol>
+{
+ fn encode(self, w: &mut Writer, s: &mut client::HandleStore<server::MarkedTypes<S>>) {
+ S::with_symbol_string(&self.unmark(), |sym| sym.encode(w, s))
+ }
+}
+
+impl<S> DecodeMut<'_, '_, S> for Symbol {
+ fn decode(r: &mut Reader<'_>, s: &mut S) -> Self {
+ Symbol::new(<&str>::decode(r, s))
+ }
+}
+
+thread_local! {
+ static INTERNER: RefCell<Interner> = RefCell::new(Interner {
+ arena: arena::Arena::new(),
+ names: fxhash::FxHashMap::default(),
+ strings: Vec::new(),
+ // Start with a base of 1 to make sure that `NonZeroU32` works.
+ sym_base: NonZeroU32::new(1).unwrap(),
+ });
+}
+
+/// Basic interner for a `Symbol`, inspired by the one in `rustc_span`.
+struct Interner {
+ arena: arena::Arena,
+ // SAFETY: These `'static` lifetimes are actually references to data owned
+ // by the Arena. This is safe, as we never return them as static references
+ // from `Interner`.
+ names: fxhash::FxHashMap<&'static str, Symbol>,
+ strings: Vec<&'static str>,
+ // The offset to apply to symbol names stored in the interner. This is used
+ // to ensure that symbol names are not re-used after the interner is
+ // cleared.
+ sym_base: NonZeroU32,
+}
+
+impl Interner {
+ fn intern(&mut self, string: &str) -> Symbol {
+ if let Some(&name) = self.names.get(string) {
+ return name;
+ }
+
+ let name = Symbol(
+ self.sym_base
+ .checked_add(self.strings.len() as u32)
+ .expect("`proc_macro` symbol name overflow"),
+ );
+
+ let string: &str = self.arena.alloc_str(string);
+
+ // SAFETY: we can extend the arena allocation to `'static` because we
+ // only access these while the arena is still alive.
+ let string: &'static str = unsafe { &*(string as *const str) };
+ self.strings.push(string);
+ self.names.insert(string, name);
+ name
+ }
+
+ /// Read a symbol's value from the store while it is held.
+ fn get(&self, symbol: Symbol) -> &str {
+ // NOTE: Subtract out the offset which was added to make the symbol
+ // nonzero and prevent symbol name re-use.
+ let name = symbol
+ .0
+ .get()
+ .checked_sub(self.sym_base.get())
+ .expect("use-after-free of `proc_macro` symbol");
+ self.strings[name as usize]
+ }
+
+ /// Clear all symbols from the store, invalidating them such that `get` will
+ /// panic if they are accessed in the future.
+ fn clear(&mut self) {
+ // NOTE: Be careful not to panic here, as we may be called on the client
+ // when a `catch_unwind` isn't installed.
+ self.sym_base = self.sym_base.saturating_add(self.strings.len() as u32);
+ self.names.clear();
+ self.strings.clear();
+
+ // SAFETY: This is cleared after the names and strings tables are
+ // cleared out, so no references into the arena should remain.
+ self.arena = arena::Arena::new();
+ }
+}
diff --git a/library/proc_macro/src/diagnostic.rs b/library/proc_macro/src/diagnostic.rs
new file mode 100644
index 000000000..6e46dc036
--- /dev/null
+++ b/library/proc_macro/src/diagnostic.rs
@@ -0,0 +1,182 @@
+use crate::Span;
+
+/// An enum representing a diagnostic level.
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+#[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.
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+pub trait MultiSpan {
+ /// Converts `self` into a `Vec<Span>`.
+ fn into_spans(self) -> Vec<Span>;
+}
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+impl MultiSpan for Span {
+ fn into_spans(self) -> Vec<Span> {
+ vec![self]
+ }
+}
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+impl MultiSpan for Vec<Span> {
+ fn into_spans(self) -> Vec<Span> {
+ self
+ }
+}
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+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.
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+#[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, $level:expr) => {
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ #[doc = concat!("Adds a new child diagnostics message to `self` with the [`",
+ stringify!($level), "`] level, and 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, $level, message));
+ self
+ }
+
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ #[doc = concat!("Adds a new child diagnostic message to `self` with the [`",
+ stringify!($level), "`] level, and 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)]
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+pub struct Children<'a>(std::slice::Iter<'a, Diagnostic>);
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+impl<'a> Iterator for Children<'a> {
+ type Item = &'a Diagnostic;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ self.0.next()
+ }
+}
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+impl Diagnostic {
+ /// Creates a new diagnostic with the given `level` and `message`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn new<T: Into<String>>(level: Level, message: T) -> Diagnostic {
+ Diagnostic { 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`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn spanned<S, T>(spans: S, level: Level, message: T) -> Diagnostic
+ where
+ S: MultiSpan,
+ T: Into<String>,
+ {
+ Diagnostic { 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`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn level(&self) -> Level {
+ self.level
+ }
+
+ /// Sets the level in `self` to `level`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn set_level(&mut self, level: Level) {
+ self.level = level;
+ }
+
+ /// Returns the message in `self`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn message(&self) -> &str {
+ &self.message
+ }
+
+ /// Sets the message in `self` to `message`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn set_message<T: Into<String>>(&mut self, message: T) {
+ self.message = message.into();
+ }
+
+ /// Returns the `Span`s in `self`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn spans(&self) -> &[Span] {
+ &self.spans
+ }
+
+ /// Sets the `Span`s in `self` to `spans`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn set_spans<S: MultiSpan>(&mut self, spans: S) {
+ self.spans = spans.into_spans();
+ }
+
+ /// Returns an iterator over the children diagnostics of `self`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn children(&self) -> Children<'_> {
+ Children(self.children.iter())
+ }
+
+ /// Emit the diagnostic.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn emit(self) {
+ fn to_internal(spans: Vec<Span>) -> crate::bridge::client::MultiSpan {
+ let mut multi_span = crate::bridge::client::MultiSpan::new();
+ for span in spans {
+ multi_span.push(span.0);
+ }
+ multi_span
+ }
+
+ let mut diag = crate::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/library/proc_macro/src/lib.rs b/library/proc_macro/src/lib.rs
new file mode 100644
index 000000000..8e478cd7b
--- /dev/null
+++ b/library/proc_macro/src/lib.rs
@@ -0,0 +1,1526 @@
+//! A support library for macro authors when defining new macros.
+//!
+//! This library, provided by the standard distribution, provides the types
+//! consumed in the interfaces of procedurally defined macro definitions such as
+//! function-like macros `#[proc_macro]`, macro attributes `#[proc_macro_attribute]` and
+//! custom derive attributes`#[proc_macro_derive]`.
+//!
+//! See [the book] for more.
+//!
+//! [the book]: ../book/ch19-06-macros.html#procedural-macros-for-generating-code-from-attributes
+
+#![stable(feature = "proc_macro_lib", since = "1.15.0")]
+#![deny(missing_docs)]
+#![doc(
+ html_playground_url = "https://play.rust-lang.org/",
+ issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
+ test(no_crate_inject, attr(deny(warnings))),
+ test(attr(allow(dead_code, deprecated, unused_variables, unused_mut)))
+)]
+// This library is copied into rust-analyzer to allow loading rustc compiled proc macros.
+// Please avoid unstable features where possible to minimize the amount of changes necessary
+// to make it compile with rust-analyzer on stable.
+#![feature(rustc_allow_const_fn_unstable)]
+#![feature(staged_api)]
+#![feature(allow_internal_unstable)]
+#![feature(decl_macro)]
+#![feature(local_key_cell_methods)]
+#![feature(maybe_uninit_write_slice)]
+#![feature(negative_impls)]
+#![feature(new_uninit)]
+#![feature(restricted_std)]
+#![feature(rustc_attrs)]
+#![feature(min_specialization)]
+#![feature(strict_provenance)]
+#![recursion_limit = "256"]
+
+#[unstable(feature = "proc_macro_internals", issue = "27812")]
+#[doc(hidden)]
+pub mod bridge;
+
+mod diagnostic;
+
+#[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+pub use diagnostic::{Diagnostic, Level, MultiSpan};
+
+use std::cmp::Ordering;
+use std::ops::RangeBounds;
+use std::path::PathBuf;
+use std::str::FromStr;
+use std::{error, fmt, iter};
+
+/// Determines whether proc_macro has been made accessible to the currently
+/// running program.
+///
+/// The proc_macro crate is only intended for use inside the implementation of
+/// procedural macros. All the functions in this crate panic if invoked from
+/// outside of a procedural macro, such as from a build script or unit test or
+/// ordinary Rust binary.
+///
+/// With consideration for Rust libraries that are designed to support both
+/// macro and non-macro use cases, `proc_macro::is_available()` provides a
+/// non-panicking way to detect whether the infrastructure required to use the
+/// API of proc_macro is presently available. Returns true if invoked from
+/// inside of a procedural macro, false if invoked from any other binary.
+#[stable(feature = "proc_macro_is_available", since = "1.57.0")]
+pub fn is_available() -> bool {
+ bridge::client::is_available()
+}
+
+/// 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.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+#[derive(Clone)]
+pub struct TokenStream(Option<bridge::client::TokenStream>);
+
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Send for TokenStream {}
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Sync for TokenStream {}
+
+/// Error returned from `TokenStream::from_str`.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+#[non_exhaustive]
+#[derive(Debug)]
+pub struct LexError;
+
+#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
+impl fmt::Display for LexError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("cannot parse string into token stream")
+ }
+}
+
+#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
+impl error::Error for LexError {}
+
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Send for LexError {}
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl !Sync for LexError {}
+
+/// Error returned from `TokenStream::expand_expr`.
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+#[non_exhaustive]
+#[derive(Debug)]
+pub struct ExpandError;
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl fmt::Display for ExpandError {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str("macro expansion failed")
+ }
+}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl error::Error for ExpandError {}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl !Send for ExpandError {}
+
+#[unstable(feature = "proc_macro_expand", issue = "90765")]
+impl !Sync for ExpandError {}
+
+impl TokenStream {
+ /// Returns an empty `TokenStream` containing no token trees.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new() -> TokenStream {
+ TokenStream(None)
+ }
+
+ /// Checks if this `TokenStream` is empty.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn is_empty(&self) -> bool {
+ self.0.as_ref().map(|h| h.is_empty()).unwrap_or(true)
+ }
+
+ /// Parses this `TokenStream` as an expression and attempts to expand any
+ /// macros within it. Returns the expanded `TokenStream`.
+ ///
+ /// Currently only expressions expanding to literals will succeed, although
+ /// this may be relaxed in the future.
+ ///
+ /// NOTE: In error conditions, `expand_expr` may leave macros unexpanded,
+ /// report an error, failing compilation, and/or return an `Err(..)`. The
+ /// specific behavior for any error condition, and what conditions are
+ /// considered errors, is unspecified and may change in the future.
+ #[unstable(feature = "proc_macro_expand", issue = "90765")]
+ pub fn expand_expr(&self) -> Result<TokenStream, ExpandError> {
+ let stream = self.0.as_ref().ok_or(ExpandError)?;
+ match bridge::client::TokenStream::expand_expr(stream) {
+ Ok(stream) => Ok(TokenStream(Some(stream))),
+ Err(_) => Err(ExpandError),
+ }
+ }
+}
+
+/// 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.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl FromStr for TokenStream {
+ type Err = LexError;
+
+ fn from_str(src: &str) -> Result<TokenStream, LexError> {
+ Ok(TokenStream(Some(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).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl ToString for TokenStream {
+ fn to_string(&self) -> String {
+ self.0.as_ref().map(|t| t.to_string()).unwrap_or_default()
+ }
+}
+
+/// 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.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+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.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+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()
+ }
+}
+
+#[stable(feature = "proc_macro_token_stream_default", since = "1.45.0")]
+impl Default for TokenStream {
+ fn default() -> Self {
+ TokenStream::new()
+ }
+}
+
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+pub use quote::{quote, quote_span};
+
+fn tree_to_bridge_tree(
+ tree: TokenTree,
+) -> bridge::TokenTree<bridge::client::TokenStream, bridge::client::Span, bridge::client::Symbol> {
+ 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),
+ }
+}
+
+/// Creates a token stream containing a single token tree.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<TokenTree> for TokenStream {
+ fn from(tree: TokenTree) -> TokenStream {
+ TokenStream(Some(bridge::client::TokenStream::from_token_tree(tree_to_bridge_tree(tree))))
+ }
+}
+
+/// Non-generic helper for implementing `FromIterator<TokenTree>` and
+/// `Extend<TokenTree>` with less monomorphization in calling crates.
+struct ConcatTreesHelper {
+ trees: Vec<
+ bridge::TokenTree<
+ bridge::client::TokenStream,
+ bridge::client::Span,
+ bridge::client::Symbol,
+ >,
+ >,
+}
+
+impl ConcatTreesHelper {
+ fn new(capacity: usize) -> Self {
+ ConcatTreesHelper { trees: Vec::with_capacity(capacity) }
+ }
+
+ fn push(&mut self, tree: TokenTree) {
+ self.trees.push(tree_to_bridge_tree(tree));
+ }
+
+ fn build(self) -> TokenStream {
+ if self.trees.is_empty() {
+ TokenStream(None)
+ } else {
+ TokenStream(Some(bridge::client::TokenStream::concat_trees(None, self.trees)))
+ }
+ }
+
+ fn append_to(self, stream: &mut TokenStream) {
+ if self.trees.is_empty() {
+ return;
+ }
+ stream.0 = Some(bridge::client::TokenStream::concat_trees(stream.0.take(), self.trees))
+ }
+}
+
+/// Non-generic helper for implementing `FromIterator<TokenStream>` and
+/// `Extend<TokenStream>` with less monomorphization in calling crates.
+struct ConcatStreamsHelper {
+ streams: Vec<bridge::client::TokenStream>,
+}
+
+impl ConcatStreamsHelper {
+ fn new(capacity: usize) -> Self {
+ ConcatStreamsHelper { streams: Vec::with_capacity(capacity) }
+ }
+
+ fn push(&mut self, stream: TokenStream) {
+ if let Some(stream) = stream.0 {
+ self.streams.push(stream);
+ }
+ }
+
+ fn build(mut self) -> TokenStream {
+ if self.streams.len() <= 1 {
+ TokenStream(self.streams.pop())
+ } else {
+ TokenStream(Some(bridge::client::TokenStream::concat_streams(None, self.streams)))
+ }
+ }
+
+ fn append_to(mut self, stream: &mut TokenStream) {
+ if self.streams.is_empty() {
+ return;
+ }
+ let base = stream.0.take();
+ if base.is_none() && self.streams.len() == 1 {
+ stream.0 = self.streams.pop();
+ } else {
+ stream.0 = Some(bridge::client::TokenStream::concat_streams(base, self.streams));
+ }
+ }
+}
+
+/// Collects a number of token trees into a single stream.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl iter::FromIterator<TokenTree> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenTree>>(trees: I) -> Self {
+ let iter = trees.into_iter();
+ let mut builder = ConcatTreesHelper::new(iter.size_hint().0);
+ iter.for_each(|tree| builder.push(tree));
+ builder.build()
+ }
+}
+
+/// A "flattening" operation on token streams, collects token trees
+/// from multiple token streams into a single stream.
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+impl iter::FromIterator<TokenStream> for TokenStream {
+ fn from_iter<I: IntoIterator<Item = TokenStream>>(streams: I) -> Self {
+ let iter = streams.into_iter();
+ let mut builder = ConcatStreamsHelper::new(iter.size_hint().0);
+ iter.for_each(|stream| builder.push(stream));
+ builder.build()
+ }
+}
+
+#[stable(feature = "token_stream_extend", since = "1.30.0")]
+impl Extend<TokenTree> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenTree>>(&mut self, trees: I) {
+ let iter = trees.into_iter();
+ let mut builder = ConcatTreesHelper::new(iter.size_hint().0);
+ iter.for_each(|tree| builder.push(tree));
+ builder.append_to(self);
+ }
+}
+
+#[stable(feature = "token_stream_extend", since = "1.30.0")]
+impl Extend<TokenStream> for TokenStream {
+ fn extend<I: IntoIterator<Item = TokenStream>>(&mut self, streams: I) {
+ let iter = streams.into_iter();
+ let mut builder = ConcatStreamsHelper::new(iter.size_hint().0);
+ iter.for_each(|stream| builder.push(stream));
+ builder.append_to(self);
+ }
+}
+
+/// Public implementation details for the `TokenStream` type, such as iterators.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub mod token_stream {
+ use crate::{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)]
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub struct IntoIter(
+ std::vec::IntoIter<
+ bridge::TokenTree<
+ bridge::client::TokenStream,
+ bridge::client::Span,
+ bridge::client::Symbol,
+ >,
+ >,
+ );
+
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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)),
+ })
+ }
+
+ fn size_hint(&self) -> (usize, Option<usize>) {
+ self.0.size_hint()
+ }
+
+ fn count(self) -> usize {
+ self.0.count()
+ }
+ }
+
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ impl IntoIterator for TokenStream {
+ type Item = TokenTree;
+ type IntoIter = IntoIter;
+
+ fn into_iter(self) -> IntoIter {
+ IntoIter(self.0.map(|v| v.into_trees()).unwrap_or_default().into_iter())
+ }
+ }
+}
+
+/// `quote!(..)` accepts arbitrary tokens and expands into a `TokenStream` describing the input.
+/// For example, `quote!(a + b)` will produce an expression, that, when evaluated, constructs
+/// the `TokenStream` `[Ident("a"), Punct('+', Alone), Ident("b")]`.
+///
+/// Unquoting is done with `$`, and works by taking the single next ident as the unquoted term.
+/// To quote `$` itself, use `$$`.
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+#[allow_internal_unstable(proc_macro_def_site, proc_macro_internals)]
+#[rustc_builtin_macro]
+pub macro quote($($t:tt)*) {
+ /* compiler built-in */
+}
+
+#[unstable(feature = "proc_macro_internals", issue = "27812")]
+#[doc(hidden)]
+mod quote;
+
+/// A region of source code, along with macro expansion information.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Copy, Clone)]
+pub struct Span(bridge::client::Span);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Span {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Span {}
+
+macro_rules! diagnostic_method {
+ ($name:ident, $level:expr) => {
+ /// Creates a new `Diagnostic` with the given `message` at the span
+ /// `self`.
+ #[unstable(feature = "proc_macro_diagnostic", issue = "54140")]
+ pub fn $name<T: Into<String>>(self, message: T) -> Diagnostic {
+ Diagnostic::spanned(self, $level, message)
+ }
+ };
+}
+
+impl Span {
+ /// A span that resolves at the macro definition site.
+ #[unstable(feature = "proc_macro_def_site", issue = "54724")]
+ pub fn def_site() -> Span {
+ Span(bridge::client::Span::def_site())
+ }
+
+ /// The span of the invocation of the current procedural macro.
+ /// Identifiers created with this span will be resolved as if they were written
+ /// directly at the macro call location (call-site hygiene) and other code
+ /// at the macro call site will be able to refer to them as well.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn call_site() -> Span {
+ Span(bridge::client::Span::call_site())
+ }
+
+ /// A span that represents `macro_rules` hygiene, and sometimes resolves at the macro
+ /// definition site (local variables, labels, `$crate`) and sometimes at the macro
+ /// call site (everything else).
+ /// The span location is taken from the call-site.
+ #[stable(feature = "proc_macro_mixed_site", since = "1.45.0")]
+ pub fn mixed_site() -> Span {
+ Span(bridge::client::Span::mixed_site())
+ }
+
+ /// The original source file into which this span points.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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`.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn source(&self) -> Span {
+ Span(self.0.source())
+ }
+
+ /// Gets the starting line/column in the source file for this span.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn start(&self) -> LineColumn {
+ self.0.start().add_1_to_column()
+ }
+
+ /// Gets the ending line/column in the source file for this span.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn end(&self) -> LineColumn {
+ self.0.end().add_1_to_column()
+ }
+
+ /// Creates an empty span pointing to directly before this span.
+ #[unstable(feature = "proc_macro_span_shrink", issue = "87552")]
+ pub fn before(&self) -> Span {
+ Span(self.0.before())
+ }
+
+ /// Creates an empty span pointing to directly after this span.
+ #[unstable(feature = "proc_macro_span_shrink", issue = "87552")]
+ pub fn after(&self) -> Span {
+ Span(self.0.after())
+ }
+
+ /// Creates a new span encompassing `self` and `other`.
+ ///
+ /// Returns `None` if `self` and `other` are from different files.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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`.
+ #[stable(feature = "proc_macro_span_resolved_at", since = "1.45.0")]
+ 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`.
+ #[stable(feature = "proc_macro_span_located_at", since = "1.45.0")]
+ pub fn located_at(&self, other: Span) -> Span {
+ other.resolved_at(*self)
+ }
+
+ /// Compares to spans to see if they're equal.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn source_text(&self) -> Option<String> {
+ self.0.source_text()
+ }
+
+ // Used by the implementation of `Span::quote`
+ #[doc(hidden)]
+ #[unstable(feature = "proc_macro_internals", issue = "27812")]
+ pub fn save_span(&self) -> usize {
+ self.0.save_span()
+ }
+
+ // Used by the implementation of `Span::quote`
+ #[doc(hidden)]
+ #[unstable(feature = "proc_macro_internals", issue = "27812")]
+ pub fn recover_proc_macro_span(id: usize) -> Span {
+ Span(bridge::client::Span::recover_proc_macro_span(id))
+ }
+
+ 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.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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`.
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+#[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).
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub line: usize,
+ /// The 1-indexed column (number of bytes in UTF-8 encoding) in the source
+ /// file on which the span starts or ends (inclusive).
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub column: usize,
+}
+
+impl LineColumn {
+ fn add_1_to_column(self) -> Self {
+ LineColumn { line: self.line, column: self.column + 1 }
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl !Send for LineColumn {}
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl !Sync for LineColumn {}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl Ord for LineColumn {
+ fn cmp(&self, other: &Self) -> Ordering {
+ self.line.cmp(&other.line).then(self.column.cmp(&other.column))
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl PartialOrd for LineColumn {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ Some(self.cmp(other))
+ }
+}
+
+/// The source file of a given `Span`.
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+#[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 might 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 might not actually be valid.
+ ///
+ /// [`is_real`]: Self::is_real
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ 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()
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+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()
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl PartialEq for SourceFile {
+ fn eq(&self, other: &Self) -> bool {
+ self.0.eq(&other.0)
+ }
+}
+
+#[unstable(feature = "proc_macro_span", issue = "54725")]
+impl Eq for SourceFile {}
+
+/// A single token or a delimited sequence of token trees (e.g., `[1, (), ..]`).
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Clone)]
+pub enum TokenTree {
+ /// A token stream surrounded by bracket delimiters.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Group(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Group),
+ /// An identifier.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Ident(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Ident),
+ /// A single punctuation character (`+`, `,`, `$`, etc.).
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Punct(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Punct),
+ /// A literal character (`'a'`), string (`"hello"`), number (`2.3`), etc.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Literal(#[stable(feature = "proc_macro_lib2", since = "1.29.0")] Literal),
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for TokenTree {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for TokenTree {}
+
+impl TokenTree {
+ /// Returns the span of this tree, delegating to the `span` method of
+ /// the contained token or a delimited stream.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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),
+ }
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Group> for TokenTree {
+ fn from(g: Group) -> TokenTree {
+ TokenTree::Group(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Ident> for TokenTree {
+ fn from(g: Ident) -> TokenTree {
+ TokenTree::Ident(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl From<Punct> for TokenTree {
+ fn from(g: Punct) -> TokenTree {
+ TokenTree::Punct(g)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+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.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Group(bridge::Group<bridge::client::TokenStream, bridge::client::Span>);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Group {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Group {}
+
+/// Describes how a sequence of token trees is delimited.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub enum Delimiter {
+ /// `( ... )`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Parenthesis,
+ /// `{ ... }`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Brace,
+ /// `[ ... ]`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Bracket,
+ /// `Ø ... Ø`
+ /// An invisible 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`.
+ /// Invisible delimiters might not survive roundtrip of a token stream through a string.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(delimiter: Delimiter, stream: TokenStream) -> Group {
+ Group(bridge::Group {
+ delimiter,
+ stream: stream.0,
+ span: bridge::DelimSpan::from_single(Span::call_site().0),
+ })
+ }
+
+ /// Returns the delimiter of this `Group`
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn stream(&self) -> TokenStream {
+ TokenStream(self.0.stream.clone())
+ }
+
+ /// Returns the span for the delimiters of this token stream, spanning the
+ /// entire `Group`.
+ ///
+ /// ```text
+ /// pub fn span(&self) -> Span {
+ /// ^^^^^^^
+ /// ```
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span.entire)
+ }
+
+ /// Returns the span pointing to the opening delimiter of this group.
+ ///
+ /// ```text
+ /// pub fn span_open(&self) -> Span {
+ /// ^
+ /// ```
+ #[stable(feature = "proc_macro_group_span", since = "1.55.0")]
+ 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 {
+ /// ^
+ /// ```
+ #[stable(feature = "proc_macro_group_span", since = "1.55.0")]
+ 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`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = bridge::DelimSpan::from_single(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).
+#[stable(feature = "proc_macro_lib", since = "1.15.0")]
+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.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Group {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(&self.to_string())
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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()
+ }
+}
+
+/// A `Punct` is a single punctuation character such as `+`, `-` or `#`.
+///
+/// Multi-character operators like `+=` are represented as two instances of `Punct` with different
+/// forms of `Spacing` returned.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+#[derive(Clone)]
+pub struct Punct(bridge::Punct<bridge::client::Span>);
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Send for Punct {}
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl !Sync for Punct {}
+
+/// Describes whether a `Punct` is followed immediately by another `Punct` ([`Spacing::Joint`]) or
+/// by a different token or whitespace ([`Spacing::Alone`]).
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub enum Spacing {
+ /// A `Punct` is not immediately followed by another `Punct`.
+ /// E.g. `+` is `Alone` in `+ =`, `+ident` and `+()`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ Alone,
+ /// A `Punct` is immediately followed by another `Punct`.
+ /// E.g. `+` is `Joint` in `+=` and `++`.
+ ///
+ /// Additionally, single quote `'` can join with identifiers to form lifetimes: `'ident`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(ch: char, spacing: Spacing) -> Punct {
+ const LEGAL_CHARS: &[char] = &[
+ '=', '<', '>', '!', '~', '+', '-', '*', '/', '%', '^', '&', '|', '@', '.', ',', ';',
+ ':', '#', '$', '?', '\'',
+ ];
+ if !LEGAL_CHARS.contains(&ch) {
+ panic!("unsupported character `{:?}`", ch);
+ }
+ Punct(bridge::Punct {
+ ch: ch as u8,
+ joint: spacing == Spacing::Joint,
+ span: Span::call_site().0,
+ })
+ }
+
+ /// Returns the value of this punctuation character as `char`.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn as_char(&self) -> char {
+ self.0.ch 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn spacing(&self) -> Spacing {
+ if self.0.joint { Spacing::Joint } else { Spacing::Alone }
+ }
+
+ /// Returns the span for this punctuation character.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configure the span for this punctuation character.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = span.0;
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Punct {
+ fn to_string(&self) -> String {
+ self.as_char().to_string()
+ }
+}
+
+/// Prints the punctuation character as a string that should be losslessly convertible
+/// back into the same character.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Punct {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ write!(f, "{}", self.as_char())
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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()
+ }
+}
+
+#[stable(feature = "proc_macro_punct_eq", since = "1.50.0")]
+impl PartialEq<char> for Punct {
+ fn eq(&self, rhs: &char) -> bool {
+ self.as_char() == *rhs
+ }
+}
+
+#[stable(feature = "proc_macro_punct_eq_flipped", since = "1.52.0")]
+impl PartialEq<Punct> for char {
+ fn eq(&self, rhs: &Punct) -> bool {
+ *self == rhs.as_char()
+ }
+}
+
+/// An identifier (`ident`).
+#[derive(Clone)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Ident(bridge::Ident<bridge::client::Span, bridge::client::Symbol>);
+
+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 (including keywords, e.g. `self` or `fn`). 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn new(string: &str, span: Span) -> Ident {
+ Ident(bridge::Ident {
+ sym: bridge::client::Symbol::new_ident(string, false),
+ is_raw: false,
+ span: span.0,
+ })
+ }
+
+ /// Same as `Ident::new`, but creates a raw identifier (`r#ident`).
+ /// The `string` argument be a valid identifier permitted by the language
+ /// (including keywords, e.g. `fn`). Keywords which are usable in path segments
+ /// (e.g. `self`, `super`) are not supported, and will cause a panic.
+ #[stable(feature = "proc_macro_raw_ident", since = "1.47.0")]
+ pub fn new_raw(string: &str, span: Span) -> Ident {
+ Ident(bridge::Ident {
+ sym: bridge::client::Symbol::new_ident(string, true),
+ is_raw: true,
+ span: span.0,
+ })
+ }
+
+ /// Returns the span of this `Ident`, encompassing the entire string returned
+ /// by [`to_string`](ToString::to_string).
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configures the span of this `Ident`, possibly changing its hygiene context.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.span = span.0;
+ }
+}
+
+/// Converts the identifier to a string that should be losslessly convertible
+/// back into the same identifier.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Ident {
+ fn to_string(&self) -> String {
+ self.0.sym.with(|sym| if self.0.is_raw { ["r#", sym].concat() } else { sym.to_owned() })
+ }
+}
+
+/// Prints the identifier as a string that should be losslessly convertible back
+/// into the same identifier.
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Ident {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ if self.0.is_raw {
+ f.write_str("r#")?;
+ }
+ fmt::Display::fmt(&self.0.sym, f)
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+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)]
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+pub struct Literal(bridge::Literal<bridge::client::Span, bridge::client::Symbol>);
+
+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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::Literal {
+ kind: bridge::LitKind::Integer,
+ symbol: bridge::client::Symbol::new(&n.to_string()),
+ suffix: Some(bridge::client::Symbol::new(stringify!($kind))),
+ span: Span::call_site().0,
+ })
+ }
+ )*)
+}
+
+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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn $name(n: $kind) -> Literal {
+ Literal(bridge::Literal {
+ kind: bridge::LitKind::Integer,
+ symbol: bridge::client::Symbol::new(&n.to_string()),
+ suffix: None,
+ span: Span::call_site().0,
+ })
+ }
+ )*)
+}
+
+impl Literal {
+ fn new(kind: bridge::LitKind, value: &str, suffix: Option<&str>) -> Self {
+ Literal(bridge::Literal {
+ kind,
+ symbol: bridge::client::Symbol::new(value),
+ suffix: suffix.map(bridge::client::Symbol::new),
+ span: Span::call_site().0,
+ })
+ }
+
+ 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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f32_unsuffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ let mut repr = n.to_string();
+ if !repr.contains('.') {
+ repr.push_str(".0");
+ }
+ Literal::new(bridge::LitKind::Float, &repr, None)
+ }
+
+ /// 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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f32_suffixed(n: f32) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ Literal::new(bridge::LitKind::Float, &n.to_string(), Some("f32"))
+ }
+
+ /// 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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f64_unsuffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ let mut repr = n.to_string();
+ if !repr.contains('.') {
+ repr.push_str(".0");
+ }
+ Literal::new(bridge::LitKind::Float, &repr, None)
+ }
+
+ /// 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 might 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.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn f64_suffixed(n: f64) -> Literal {
+ if !n.is_finite() {
+ panic!("Invalid float literal {n}");
+ }
+ Literal::new(bridge::LitKind::Float, &n.to_string(), Some("f64"))
+ }
+
+ /// String literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn string(string: &str) -> Literal {
+ let quoted = format!("{:?}", string);
+ assert!(quoted.starts_with('"') && quoted.ends_with('"'));
+ let symbol = &quoted[1..quoted.len() - 1];
+ Literal::new(bridge::LitKind::Str, symbol, None)
+ }
+
+ /// Character literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn character(ch: char) -> Literal {
+ let quoted = format!("{:?}", ch);
+ assert!(quoted.starts_with('\'') && quoted.ends_with('\''));
+ let symbol = &quoted[1..quoted.len() - 1];
+ Literal::new(bridge::LitKind::Char, symbol, None)
+ }
+
+ /// Byte string literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn byte_string(bytes: &[u8]) -> Literal {
+ let string = bytes
+ .iter()
+ .cloned()
+ .flat_map(std::ascii::escape_default)
+ .map(Into::<char>::into)
+ .collect::<String>();
+ Literal::new(bridge::LitKind::ByteStr, &string, None)
+ }
+
+ /// Returns the span encompassing this literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn span(&self) -> Span {
+ Span(self.0.span)
+ }
+
+ /// Configures the span associated for this literal.
+ #[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+ pub fn set_span(&mut self, span: Span) {
+ self.0.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}'.
+ #[unstable(feature = "proc_macro_span", issue = "54725")]
+ pub fn subspan<R: RangeBounds<usize>>(&self, range: R) -> Option<Span> {
+ self.0.span.subspan(range.start_bound().cloned(), range.end_bound().cloned()).map(Span)
+ }
+
+ fn with_symbol_and_suffix<R>(&self, f: impl FnOnce(&str, &str) -> R) -> R {
+ self.0.symbol.with(|symbol| match self.0.suffix {
+ Some(suffix) => suffix.with(|suffix| f(symbol, suffix)),
+ None => f(symbol, ""),
+ })
+ }
+
+ /// Invokes the callback with a `&[&str]` consisting of each part of the
+ /// literal's representation. This is done to allow the `ToString` and
+ /// `Display` implementations to borrow references to symbol values, and
+ /// both be optimized to reduce overhead.
+ fn with_stringify_parts<R>(&self, f: impl FnOnce(&[&str]) -> R) -> R {
+ /// Returns a string containing exactly `num` '#' characters.
+ /// Uses a 256-character source string literal which is always safe to
+ /// index with a `u8` index.
+ fn get_hashes_str(num: u8) -> &'static str {
+ const HASHES: &str = "\
+ ################################################################\
+ ################################################################\
+ ################################################################\
+ ################################################################\
+ ";
+ const _: () = assert!(HASHES.len() == 256);
+ &HASHES[..num as usize]
+ }
+
+ self.with_symbol_and_suffix(|symbol, suffix| match self.0.kind {
+ bridge::LitKind::Byte => f(&["b'", symbol, "'", suffix]),
+ bridge::LitKind::Char => f(&["'", symbol, "'", suffix]),
+ bridge::LitKind::Str => f(&["\"", symbol, "\"", suffix]),
+ bridge::LitKind::StrRaw(n) => {
+ let hashes = get_hashes_str(n);
+ f(&["r", hashes, "\"", symbol, "\"", hashes, suffix])
+ }
+ bridge::LitKind::ByteStr => f(&["b\"", symbol, "\"", suffix]),
+ bridge::LitKind::ByteStrRaw(n) => {
+ let hashes = get_hashes_str(n);
+ f(&["br", hashes, "\"", symbol, "\"", hashes, suffix])
+ }
+ _ => f(&[symbol, suffix]),
+ })
+ }
+}
+
+/// Parse a single literal from its stringified representation.
+///
+/// In order to parse successfully, the input string must not contain anything
+/// but the literal token. Specifically, it must not contain whitespace or
+/// comments in addition to the literal.
+///
+/// The resulting literal token will have a `Span::call_site()` span.
+///
+/// NOTE: some errors may cause panics instead of returning `LexError`. We
+/// reserve the right to change these errors into `LexError`s later.
+#[stable(feature = "proc_macro_literal_parse", since = "1.54.0")]
+impl FromStr for Literal {
+ type Err = LexError;
+
+ fn from_str(src: &str) -> Result<Self, LexError> {
+ match bridge::client::FreeFunctions::literal_from_str(src) {
+ Ok(literal) => Ok(Literal(literal)),
+ Err(()) => Err(LexError),
+ }
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl ToString for Literal {
+ fn to_string(&self) -> String {
+ self.with_stringify_parts(|parts| parts.concat())
+ }
+}
+
+/// Prints the literal as a string that should be losslessly convertible
+/// back into the same literal (except for possible rounding for floating point literals).
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Display for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.with_stringify_parts(|parts| {
+ for part in parts {
+ fmt::Display::fmt(part, f)?;
+ }
+ Ok(())
+ })
+ }
+}
+
+#[stable(feature = "proc_macro_lib2", since = "1.29.0")]
+impl fmt::Debug for Literal {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.debug_struct("Literal")
+ // format the kind on one line even in {:#?} mode
+ .field("kind", &format_args!("{:?}", &self.0.kind))
+ .field("symbol", &self.0.symbol)
+ // format `Some("...")` on one line even in {:#?} mode
+ .field("suffix", &format_args!("{:?}", &self.0.suffix))
+ .field("span", &self.0.span)
+ .finish()
+ }
+}
+
+/// Tracked access to environment variables.
+#[unstable(feature = "proc_macro_tracked_env", issue = "99515")]
+pub mod tracked_env {
+ use std::env::{self, VarError};
+ use std::ffi::OsStr;
+
+ /// Retrieve an environment variable and add it to build dependency info.
+ /// Build system executing the compiler will know that the variable was accessed during
+ /// compilation, and will be able to rerun the build when the value of that variable changes.
+ /// Besides the dependency tracking this function should be equivalent to `env::var` from the
+ /// standard library, except that the argument must be UTF-8.
+ #[unstable(feature = "proc_macro_tracked_env", issue = "99515")]
+ pub fn var<K: AsRef<OsStr> + AsRef<str>>(key: K) -> Result<String, VarError> {
+ let key: &str = key.as_ref();
+ let value = env::var(key);
+ crate::bridge::client::FreeFunctions::track_env_var(key, value.as_deref().ok());
+ value
+ }
+}
+
+/// Tracked access to additional files.
+#[unstable(feature = "track_path", issue = "99515")]
+pub mod tracked_path {
+
+ /// Track a file explicitly.
+ ///
+ /// Commonly used for tracking asset preprocessing.
+ #[unstable(feature = "track_path", issue = "99515")]
+ pub fn path<P: AsRef<str>>(path: P) {
+ let path: &str = path.as_ref();
+ crate::bridge::client::FreeFunctions::track_path(path);
+ }
+}
diff --git a/library/proc_macro/src/quote.rs b/library/proc_macro/src/quote.rs
new file mode 100644
index 000000000..04fa696d5
--- /dev/null
+++ b/library/proc_macro/src/quote.rs
@@ -0,0 +1,141 @@
+//! # Quasiquoter
+//! This file contains the implementation internals of the quasiquoter provided by `quote!`.
+
+//! This quasiquoter uses macros 2.0 hygiene to reliably access
+//! items from `proc_macro`, to build a `proc_macro::TokenStream`.
+
+use crate::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
+
+macro_rules! quote_tt {
+ (($($t:tt)*)) => { Group::new(Delimiter::Parenthesis, quote!($($t)*)) };
+ ([$($t:tt)*]) => { Group::new(Delimiter::Bracket, quote!($($t)*)) };
+ ({$($t:tt)*}) => { Group::new(Delimiter::Brace, quote!($($t)*)) };
+ (,) => { Punct::new(',', Spacing::Alone) };
+ (.) => { Punct::new('.', Spacing::Alone) };
+ (;) => { Punct::new(';', Spacing::Alone) };
+ (!) => { Punct::new('!', Spacing::Alone) };
+ (<) => { Punct::new('<', Spacing::Alone) };
+ (>) => { Punct::new('>', Spacing::Alone) };
+ (&) => { Punct::new('&', Spacing::Alone) };
+ (=) => { Punct::new('=', Spacing::Alone) };
+ ($i:ident) => { Ident::new(stringify!($i), Span::def_site()) };
+}
+
+macro_rules! quote_ts {
+ ((@ $($t:tt)*)) => { $($t)* };
+ (::) => {
+ [
+ TokenTree::from(Punct::new(':', Spacing::Joint)),
+ TokenTree::from(Punct::new(':', Spacing::Alone)),
+ ].iter()
+ .cloned()
+ .map(|mut x| {
+ x.set_span(Span::def_site());
+ x
+ })
+ .collect::<TokenStream>()
+ };
+ ($t:tt) => { TokenTree::from(quote_tt!($t)) };
+}
+
+/// Simpler version of the real `quote!` macro, implemented solely
+/// through `macro_rules`, for bootstrapping the real implementation
+/// (see the `quote` function), which does not have access to the
+/// real `quote!` macro due to the `proc_macro` crate not being
+/// able to depend on itself.
+///
+/// Note: supported tokens are a subset of the real `quote!`, but
+/// unquoting is different: instead of `$x`, this uses `(@ expr)`.
+macro_rules! quote {
+ () => { TokenStream::new() };
+ ($($t:tt)*) => {
+ [
+ $(TokenStream::from(quote_ts!($t)),)*
+ ].iter().cloned().collect::<TokenStream>()
+ };
+}
+
+/// Quote a `TokenStream` into a `TokenStream`.
+/// This is the actual implementation of the `quote!()` proc macro.
+///
+/// It is loaded by the compiler in `register_builtin_macros`.
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+pub fn quote(stream: TokenStream) -> TokenStream {
+ if stream.is_empty() {
+ return quote!(crate::TokenStream::new());
+ }
+ let proc_macro_crate = quote!(crate);
+ let mut after_dollar = false;
+ let tokens = stream
+ .into_iter()
+ .filter_map(|tree| {
+ if after_dollar {
+ after_dollar = false;
+ match tree {
+ TokenTree::Ident(_) => {
+ return Some(quote!(Into::<crate::TokenStream>::into(
+ Clone::clone(&(@ tree))),));
+ }
+ TokenTree::Punct(ref tt) if tt.as_char() == '$' => {}
+ _ => panic!("`$` must be followed by an ident or `$` in `quote!`"),
+ }
+ } else if let TokenTree::Punct(ref tt) = tree {
+ if tt.as_char() == '$' {
+ after_dollar = true;
+ return None;
+ }
+ }
+
+ Some(quote!(crate::TokenStream::from((@ match tree {
+ TokenTree::Punct(tt) => quote!(crate::TokenTree::Punct(crate::Punct::new(
+ (@ TokenTree::from(Literal::character(tt.as_char()))),
+ (@ match tt.spacing() {
+ Spacing::Alone => quote!(crate::Spacing::Alone),
+ Spacing::Joint => quote!(crate::Spacing::Joint),
+ }),
+ ))),
+ TokenTree::Group(tt) => quote!(crate::TokenTree::Group(crate::Group::new(
+ (@ match tt.delimiter() {
+ Delimiter::Parenthesis => quote!(crate::Delimiter::Parenthesis),
+ Delimiter::Brace => quote!(crate::Delimiter::Brace),
+ Delimiter::Bracket => quote!(crate::Delimiter::Bracket),
+ Delimiter::None => quote!(crate::Delimiter::None),
+ }),
+ (@ quote(tt.stream())),
+ ))),
+ TokenTree::Ident(tt) => quote!(crate::TokenTree::Ident(crate::Ident::new(
+ (@ TokenTree::from(Literal::string(&tt.to_string()))),
+ (@ quote_span(proc_macro_crate.clone(), tt.span())),
+ ))),
+ TokenTree::Literal(tt) => quote!(crate::TokenTree::Literal({
+ let mut iter = (@ TokenTree::from(Literal::string(&tt.to_string())))
+ .parse::<crate::TokenStream>()
+ .unwrap()
+ .into_iter();
+ if let (Some(crate::TokenTree::Literal(mut lit)), None) =
+ (iter.next(), iter.next())
+ {
+ lit.set_span((@ quote_span(proc_macro_crate.clone(), tt.span())));
+ lit
+ } else {
+ unreachable!()
+ }
+ }))
+ })),))
+ })
+ .collect::<TokenStream>();
+
+ if after_dollar {
+ panic!("unexpected trailing `$` in `quote!`");
+ }
+
+ quote!([(@ tokens)].iter().cloned().collect::<crate::TokenStream>())
+}
+
+/// Quote a `Span` into a `TokenStream`.
+/// This is needed to implement a custom quoter.
+#[unstable(feature = "proc_macro_quote", issue = "54722")]
+pub fn quote_span(proc_macro_crate: TokenStream, span: Span) -> TokenStream {
+ let id = span.save_span();
+ quote!((@ proc_macro_crate ) ::Span::recover_proc_macro_span((@ TokenTree::from(Literal::usize_unsuffixed(id)))))
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 10:46:52 +0000