crates/proc_macro_srv/src/abis/abi_1_47/mod.rs

   1 //! Macro ABI for version 1.47 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 use libloading::Library;
  11
  12 use proc_macro_api::ProcMacroKind;
  13
  14 use super::PanicMessage;
  15
  16 pub use rustc_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 = rustc_server::TokenStream::with_subtree(macro_body.clone());
  42
  43         let parsed_attributes = attributes.map_or(rustc_server::TokenStream::new(), |attr| {
  44             rustc_server::TokenStream::with_subtree(attr.clone())
  45         });
  46
  47         for proc_macro in &self.exported_macros {
  48             match proc_macro {
  49                 proc_macro::bridge::client::ProcMacro::CustomDerive {
  50                     trait_name, client, ..
  51                 } if *trait_name == macro_name => {
  52                     let res = client.run(
  53                         &proc_macro::bridge::server::SameThread,
  54                         rustc_server::Rustc::default(),
  55                         parsed_body,
  56                         false,
  57                     );
  58                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  59                 }
  60                 proc_macro::bridge::client::ProcMacro::Bang { name, client }
  61                     if *name == macro_name =>
  62                 {
  63                     let res = client.run(
  64                         &proc_macro::bridge::server::SameThread,
  65                         rustc_server::Rustc::default(),
  66                         parsed_body,
  67                         false,
  68                     );
  69                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  70                 }
  71                 proc_macro::bridge::client::ProcMacro::Attr { name, client }
  72                     if *name == macro_name =>
  73                 {
  74                     let res = client.run(
  75                         &proc_macro::bridge::server::SameThread,
  76                         rustc_server::Rustc::default(),
  77                         parsed_attributes,
  78                         parsed_body,
  79                         false,
  80                     );
  81                     return res.map(|it| it.into_subtree()).map_err(PanicMessage::from);
  82                 }
  83                 _ => continue,
  84             }
  85         }
  86
  87         Err(proc_macro::bridge::PanicMessage::String("Nothing to expand".to_string()).into())
  88     }
  89
  90     pub fn list_macros(&self) -> Vec<(String, ProcMacroKind)> {
  91         self.exported_macros
  92             .iter()
  93             .map(|proc_macro| match proc_macro {
  94                 proc_macro::bridge::client::ProcMacro::CustomDerive { trait_name, .. } => {
  95                     (trait_name.to_string(), ProcMacroKind::CustomDerive)
  96                 }
  97                 proc_macro::bridge::client::ProcMacro::Bang { name, .. } => {
  98                     (name.to_string(), ProcMacroKind::FuncLike)
  99                 }
 100                 proc_macro::bridge::client::ProcMacro::Attr { name, .. } => {
 101                     (name.to_string(), ProcMacroKind::Attr)
 102                 }
 103             })
 104             .collect()
 105     }
 106 }