crates/proc-macro-srv/src/abis/abi_1_63/mod.rs

   1 //! Macro ABI for version 1.63 of rustc
   2
   3 #[allow(dead_code)]
   4 #[doc(hidden)]
   5 mod proc_macro;
   6
   7 #[allow(dead_code)]
   8 #[doc(hidden)]
   9 mod ra_server;
  10
  11 use libloading::Library;
  12 use proc_macro_api::ProcMacroKind;
  13
  14 use super::PanicMessage;
  15
  16 pub use ra_server::TokenStream;
  17
  18 pub(crate) struct Abi {
  19     exported_macros: Vec<proc_macro::bridge::client::ProcMacro>,
  20 }
  21
  22 impl From<proc_macro::bridge::PanicMessage> for PanicMessage {
  23     fn from(p: proc_macro::bridge::PanicMessage) -> Self {
  24         Self { message: p.as_str().map(|s| s.to_string()) }
  25     }
  26 }
  27
  28 impl Abi {
  29     pub unsafe fn from_lib(lib: &Library, symbol_name: String) -> Result<Abi, libloading::Error> {
  30         let macros: libloading::Symbol<'_, &&[proc_macro::bridge::client::ProcMacro]> =
  31             lib.get(symbol_name.as_bytes())?;
  32         Ok(Self { exported_macros: macros.to_vec() })
  33     }
  34
  35     pub fn expand(
  36         &self,
  37         macro_name: &str,
  38         macro_body: &tt::Subtree,
  39         attributes: Option<&tt::Subtree>,
  40     ) -> Result<tt::Subtree, PanicMessage> {
  41         let parsed_body = TokenStream::with_subtree(macro_body.clone());
  42
  43         let parsed_attributes =
  44             attributes.map_or(TokenStream::new(), |attr| TokenStream::with_subtree(attr.clone()));
  45
  46         for proc_macro in &self.exported_macros {
  47             match proc_macro {
  48                 proc_macro::bridge::client::ProcMacro::CustomDerive {
  49                     trait_name, client, ..
  50                 } if *trait_name == macro_name => {
  51                     let res = client.run(
  52                         &proc_macro::bridge::server::SameThread,
  53                         ra_server::RustAnalyzer::default(),
  54                         parsed_body,
  55                         true,
  56                     );
  57                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  58                 }
  59                 proc_macro::bridge::client::ProcMacro::Bang { name, client }
  60                     if *name == macro_name =>
  61                 {
  62                     let res = client.run(
  63                         &proc_macro::bridge::server::SameThread,
  64                         ra_server::RustAnalyzer::default(),
  65                         parsed_body,
  66                         true,
  67                     );
  68                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  69                 }
  70                 proc_macro::bridge::client::ProcMacro::Attr { name, client }
  71                     if *name == macro_name =>
  72                 {
  73                     let res = client.run(
  74                         &proc_macro::bridge::server::SameThread,
  75                         ra_server::RustAnalyzer::default(),
  76                         parsed_attributes,
  77                         parsed_body,
  78                         true,
  79                     );
  80                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  81                 }
  82                 _ => continue,
  83             }
  84         }
  85
  86         Err(proc_macro::bridge::PanicMessage::String("Nothing to expand".to_string()).into())
  87     }
  88
  89     pub fn list_macros(&self) -> Vec<(String, ProcMacroKind)> {
  90         self.exported_macros
  91             .iter()
  92             .map(|proc_macro| match proc_macro {
  93                 proc_macro::bridge::client::ProcMacro::CustomDerive { trait_name, .. } => {
  94                     (trait_name.to_string(), ProcMacroKind::CustomDerive)
  95                 }
  96                 proc_macro::bridge::client::ProcMacro::Bang { name, .. } => {
  97                     (name.to_string(), ProcMacroKind::FuncLike)
  98                 }
  99                 proc_macro::bridge::client::ProcMacro::Attr { name, .. } => {
 100                     (name.to_string(), ProcMacroKind::Attr)
 101                 }
 102             })
 103             .collect()
 104     }
 105 }