1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
//! RA Proc Macro Server
//!
//! This library is able to call compiled Rust custom derive dynamic libraries on arbitrary code.
//! The general idea here is based on https://github.com/fedochet/rust-proc-macro-expander.
//!
//! But we adapt it to better fit RA needs:
//!
//! * We use `tt` for proc-macro `TokenStream` server, it is easier to manipulate and interact with
//! RA than `proc-macro2` token stream.
//! * By **copying** the whole rustc `lib_proc_macro` code, we are able to build this with `stable`
//! rustc rather than `unstable`. (Although in general ABI compatibility is still an issue)…
#![allow(unreachable_pub)]
#[allow(dead_code)]
#[doc(hidden)]
mod proc_macro;
#[doc(hidden)]
mod rustc_server;
mod dylib;
use proc_macro::bridge::client::TokenStream;
use proc_macro_api::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask};
use std::{
collections::{hash_map::Entry, HashMap},
env, fs,
path::{Path, PathBuf},
time::SystemTime,
};
#[derive(Default)]
pub(crate) struct ProcMacroSrv {
expanders: HashMap<(PathBuf, SystemTime), dylib::Expander>,
}
impl ProcMacroSrv {
pub fn expand(&mut self, task: &ExpansionTask) -> Result<ExpansionResult, String> {
let expander = self.expander(&task.lib)?;
let mut prev_env = HashMap::new();
for (k, v) in &task.env {
prev_env.insert(k.as_str(), env::var_os(k));
env::set_var(k, v);
}
let result = expander.expand(&task.macro_name, &task.macro_body, task.attributes.as_ref());
for (k, _) in &task.env {
match &prev_env[k.as_str()] {
Some(v) => env::set_var(k, v),
None => env::remove_var(k),
}
}
match result {
Ok(expansion) => Ok(ExpansionResult { expansion }),
Err(msg) => {
let msg = msg.as_str().unwrap_or("<unknown error>");
Err(format!("proc-macro panicked: {}", msg))
}
}
}
pub fn list_macros(&mut self, task: &ListMacrosTask) -> Result<ListMacrosResult, String> {
let expander = self.expander(&task.lib)?;
Ok(ListMacrosResult { macros: expander.list_macros() })
}
fn expander(&mut self, path: &Path) -> Result<&dylib::Expander, String> {
let time = fs::metadata(path).and_then(|it| it.modified()).map_err(|err| {
format!("Failed to get file metadata for {}: {:?}", path.display(), err)
})?;
Ok(match self.expanders.entry((path.to_path_buf(), time)) {
Entry::Vacant(v) => v.insert(dylib::Expander::new(path).map_err(|err| {
format!("Cannot create expander for {}: {:?}", path.display(), err)
})?),
Entry::Occupied(e) => e.into_mut(),
})
}
}
pub mod cli;
#[cfg(test)]
mod tests;
|
