1 //! Procedural macros are implemented by compiling the macro providing crate
2 //! to a dynamic library with a particular ABI which the compiler uses to expand
3 //! macros. Unfortunately this ABI is not specified and can change from version
4 //! to version of the compiler. To support this we copy the ABI from the rust
5 //! compiler into submodules of this module (e.g proc_macro_srv::abis::abi_1_47).
7 //! All of these ABIs are subsumed in the `Abi` enum, which exposes a simple
8 //! interface the rest of rust analyzer can use to talk to the macro
11 //! # Adding a new ABI
13 //! To add a new ABI you'll need to copy the source of the target proc_macro
14 //! crate from the source tree of the Rust compiler into this directory tree.
15 //! Then you'll need to modify it
16 //! - Remove any feature! or other things which won't compile on stable
17 //! - change any absolute imports to relative imports within the ABI tree
19 //! Then you'll need to add a branch to the `Abi` enum and an implementation of
20 //! `Abi::expand`, `Abi::list_macros` and `Abi::from_lib` for the new ABI. See
21 //! `proc_macro_srv/src/abis/abi_1_47/mod.rs` for an example. Finally you'll
22 //! need to update the conditionals in `Abi::from_lib` to return your new ABI
23 //! for the relevant versions of the rust compiler
26 // pub(crate) so tests can use the TokenStream, more notes in test/utils.rs
27 pub(crate) mod abi_1_48;
35 use super::dylib::LoadProcMacroDylibError;
36 pub(crate) use abi_1_48::Abi as Abi_1_48;
37 pub(crate) use abi_1_54::Abi as Abi_1_54;
38 pub(crate) use abi_1_56::Abi as Abi_1_56;
39 pub(crate) use abi_1_57::Abi as Abi_1_57;
40 pub(crate) use abi_1_58::Abi as Abi_1_58;
41 pub(crate) use abi_1_63::Abi as Abi_1_63;
42 pub(crate) use abi_1_64::Abi as Abi_1_64;
43 use libloading::Library;
44 use proc_macro_api::{ProcMacroKind, RustCInfo};
46 pub struct PanicMessage {
47 message: Option<String>,
51 pub fn as_str(&self) -> Option<String> {
71 /// *`lib` - The dynamic library containing the macro implementations
72 /// *`symbol_name` - The symbol name the macros can be found attributes
73 /// *`info` - RustCInfo about the compiler that was used to compile the
74 /// macro crate. This is the information we use to figure out
75 /// which ABI to return
80 ) -> Result<Abi, LoadProcMacroDylibError> {
81 // FIXME: this should use exclusive ranges when they're stable
82 // https://github.com/rust-lang/rust/issues/37854
83 match (info.version.0, info.version.1) {
85 let inner = unsafe { Abi_1_48::from_lib(lib, symbol_name) }?;
86 Ok(Abi::Abi1_48(inner))
89 let inner = unsafe { Abi_1_54::from_lib(lib, symbol_name) }?;
90 Ok(Abi::Abi1_54(inner))
93 let inner = unsafe { Abi_1_56::from_lib(lib, symbol_name) }?;
94 Ok(Abi::Abi1_56(inner))
97 let inner = unsafe { Abi_1_57::from_lib(lib, symbol_name) }?;
98 Ok(Abi::Abi1_57(inner))
101 let inner = unsafe { Abi_1_58::from_lib(lib, symbol_name) }?;
102 Ok(Abi::Abi1_58(inner))
105 let inner = unsafe { Abi_1_63::from_lib(lib, symbol_name) }?;
106 Ok(Abi::Abi1_63(inner))
109 let inner = unsafe { Abi_1_64::from_lib(lib, symbol_name) }?;
110 Ok(Abi::Abi1_64(inner))
112 _ => Err(LoadProcMacroDylibError::UnsupportedABI),
119 macro_body: &tt::Subtree,
120 attributes: Option<&tt::Subtree>,
121 ) -> Result<tt::Subtree, PanicMessage> {
123 Self::Abi1_48(abi) => abi.expand(macro_name, macro_body, attributes),
124 Self::Abi1_54(abi) => abi.expand(macro_name, macro_body, attributes),
125 Self::Abi1_56(abi) => abi.expand(macro_name, macro_body, attributes),
126 Self::Abi1_57(abi) => abi.expand(macro_name, macro_body, attributes),
127 Self::Abi1_58(abi) => abi.expand(macro_name, macro_body, attributes),
128 Self::Abi1_63(abi) => abi.expand(macro_name, macro_body, attributes),
129 Self::Abi1_64(abi) => abi.expand(macro_name, macro_body, attributes),
133 pub fn list_macros(&self) -> Vec<(String, ProcMacroKind)> {
135 Self::Abi1_48(abi) => abi.list_macros(),
136 Self::Abi1_54(abi) => abi.list_macros(),
137 Self::Abi1_56(abi) => abi.list_macros(),
138 Self::Abi1_57(abi) => abi.list_macros(),
139 Self::Abi1_58(abi) => abi.list_macros(),
140 Self::Abi1_63(abi) => abi.list_macros(),
141 Self::Abi1_64(abi) => abi.list_macros(),