diff options
author | bors[bot] <26634292+bors[bot]@users.noreply.github.com> | 2020-04-06 16:08:26 +0100 |
---|---|---|
committer | GitHub <[email protected]> | 2020-04-06 16:08:26 +0100 |
commit | f6d688d13070a54b288486900a30680d013c66ca (patch) | |
tree | 39262a1e6cb34897723c4c36b7503fc1483c5a9f /crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs | |
parent | 2603a9e628d304c8cb8fd08979e2f9c9afeac69e (diff) | |
parent | 4f70162f54ceaa4ff68a5ab74e31b5dda7ac9444 (diff) |
Merge #3842
3842: Add lib-proc-macro mod in ra_proc_macro_srv r=matklad a=edwin0cheng
This PR add a module in ra_proc_macro_srv, which is just copy & paste from rustc lib_proc_macro and remove all unstable features in it.
The main idea here is by doing that, we could build the `ra_proc_macro_srv` without nightly compiler and remain ABI compatibility.
Co-authored-by: Edwin Cheng <[email protected]>
Diffstat (limited to 'crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs')
-rw-r--r-- | crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs b/crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs new file mode 100644 index 000000000..b8addff4a --- /dev/null +++ b/crates/ra_proc_macro_srv/src/proc_macro/bridge/closure.rs | |||
@@ -0,0 +1,27 @@ | |||
1 | //! lib-proc-macro Closure type (equivalent to `&mut dyn FnMut(A) -> R`) that's `repr(C)`. | ||
2 | //! | ||
3 | //! Copy from https://github.com/rust-lang/rust/blob/6050e523bae6de61de4e060facc43dc512adaccd/src/libproc_macro/bridge/closure.rs# | ||
4 | //! augmented with removing unstable features | ||
5 | |||
6 | #[repr(C)] | ||
7 | pub struct Closure<'a, A, R> { | ||
8 | call: unsafe extern "C" fn(&mut Env, A) -> R, | ||
9 | env: &'a mut Env, | ||
10 | } | ||
11 | |||
12 | struct Env; | ||
13 | |||
14 | impl<'a, A, R, F: FnMut(A) -> R> From<&'a mut F> for Closure<'a, A, R> { | ||
15 | fn from(f: &'a mut F) -> Self { | ||
16 | unsafe extern "C" fn call<A, R, F: FnMut(A) -> R>(env: &mut Env, arg: A) -> R { | ||
17 | (*(env as *mut _ as *mut F))(arg) | ||
18 | } | ||
19 | Closure { call: call::<A, R, F>, env: unsafe { &mut *(f as *mut _ as *mut Env) } } | ||
20 | } | ||
21 | } | ||
22 | |||
23 | impl<'a, A, R> Closure<'a, A, R> { | ||
24 | pub fn call(&mut self, arg: A) -> R { | ||
25 | unsafe { (self.call)(self.env, arg) } | ||
26 | } | ||
27 | } | ||