crates/proc-macro-srv/src/abis/abi_1_58/mod.rs

   1 //! Macro ABI for version 1.58 of rustc
   2
   3 #[allow(dead_code)]
   4 #[doc(hidden)]
   5 mod proc_macro;
   6
   7 #[allow(dead_code)]
   8 #[doc(hidden)]
   9 mod rustc_server;
  10
  11 use libloading::Library;
  12 use proc_macro_api::ProcMacroKind;
  13
  14 use super::PanicMessage;
  15
  16 pub(crate) struct Abi {
  17     exported_macros: Vec<proc_macro::bridge::client::ProcMacro>,
  18 }
  19
  20 impl From<proc_macro::bridge::PanicMessage> for PanicMessage {
  21     fn from(p: proc_macro::bridge::PanicMessage) -> Self {
  22         Self { message: p.as_str().map(|s| s.to_string()) }
  23     }
  24 }
  25
  26 impl Abi {
  27     pub unsafe fn from_lib(lib: &Library, symbol_name: String) -> Result<Abi, libloading::Error> {
  28         let macros: libloading::Symbol<'_, &&[proc_macro::bridge::client::ProcMacro]> =
  29             lib.get(symbol_name.as_bytes())?;
  30         Ok(Self { exported_macros: macros.to_vec() })
  31     }
  32
  33     pub fn expand(
  34         &self,
  35         macro_name: &str,
  36         macro_body: &tt::Subtree,
  37         attributes: Option<&tt::Subtree>,
  38     ) -> Result<tt::Subtree, PanicMessage> {
  39         let parsed_body = rustc_server::TokenStream::with_subtree(macro_body.clone());
  40
  41         let parsed_attributes = attributes.map_or(rustc_server::TokenStream::new(), |attr| {
  42             rustc_server::TokenStream::with_subtree(attr.clone())
  43         });
  44
  45         for proc_macro in &self.exported_macros {
  46             match proc_macro {
  47                 proc_macro::bridge::client::ProcMacro::CustomDerive {
  48                     trait_name, client, ..
  49                 } if *trait_name == macro_name => {
  50                     let res = client.run(
  51                         &proc_macro::bridge::server::SameThread,
  52                         rustc_server::Rustc::default(),
  53                         parsed_body,
  54                         true,
  55                     );
  56                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  57                 }
  58                 proc_macro::bridge::client::ProcMacro::Bang { name, client }
  59                     if *name == macro_name =>
  60                 {
  61                     let res = client.run(
  62                         &proc_macro::bridge::server::SameThread,
  63                         rustc_server::Rustc::default(),
  64                         parsed_body,
  65                         true,
  66                     );
  67                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  68                 }
  69                 proc_macro::bridge::client::ProcMacro::Attr { name, client }
  70                     if *name == macro_name =>
  71                 {
  72                     let res = client.run(
  73                         &proc_macro::bridge::server::SameThread,
  74                         rustc_server::Rustc::default(),
  75                         parsed_attributes,
  76                         parsed_body,
  77                         true,
  78                     );
  79                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  80                 }
  81                 _ => continue,
  82             }
  83         }
  84
  85         Err(proc_macro::bridge::PanicMessage::String("Nothing to expand".to_string()).into())
  86     }
  87
  88     pub fn list_macros(&self) -> Vec<(String, ProcMacroKind)> {
  89         self.exported_macros
  90             .iter()
  91             .map(|proc_macro| match proc_macro {
  92                 proc_macro::bridge::client::ProcMacro::CustomDerive { trait_name, .. } => {
  93                     (trait_name.to_string(), ProcMacroKind::CustomDerive)
  94                 }
  95                 proc_macro::bridge::client::ProcMacro::Bang { name, .. } => {
  96                     (name.to_string(), ProcMacroKind::FuncLike)
  97                 }
  98                 proc_macro::bridge::client::ProcMacro::Attr { name, .. } => {
  99                     (name.to_string(), ProcMacroKind::Attr)
 100                 }
 101             })
 102             .collect()
 103     }
 104 }