From f7f121d60d0f6b8f280e09397b14a8afd0a369c1 Mon Sep 17 00:00:00 2001 From: Edwin Cheng Date: Sat, 4 Apr 2020 16:09:36 +0800 Subject: Add dylib loading code --- crates/ra_proc_macro_srv/Cargo.toml | 4 +- crates/ra_proc_macro_srv/src/dylib.rs | 220 +++++++++++++++++++++++++++ crates/ra_proc_macro_srv/src/lib.rs | 2 + crates/ra_proc_macro_srv/src/rustc_server.rs | 4 + 4 files changed, 229 insertions(+), 1 deletion(-) create mode 100644 crates/ra_proc_macro_srv/src/dylib.rs (limited to 'crates/ra_proc_macro_srv') diff --git a/crates/ra_proc_macro_srv/Cargo.toml b/crates/ra_proc_macro_srv/Cargo.toml index f08de5fc7..437b8f475 100644 --- a/crates/ra_proc_macro_srv/Cargo.toml +++ b/crates/ra_proc_macro_srv/Cargo.toml @@ -12,9 +12,11 @@ doctest = false ra_tt = { path = "../ra_tt" } ra_mbe = { path = "../ra_mbe" } ra_proc_macro = { path = "../ra_proc_macro" } +goblin = "0.2.1" +libloading = "0.6.0" [dev-dependencies] cargo_metadata = "0.9.1" difference = "2.0.0" # used as proc macro test target -serde_derive = "=1.0.104" \ No newline at end of file +serde_derive = "=1.0.104" diff --git a/crates/ra_proc_macro_srv/src/dylib.rs b/crates/ra_proc_macro_srv/src/dylib.rs new file mode 100644 index 000000000..525c7ac7b --- /dev/null +++ b/crates/ra_proc_macro_srv/src/dylib.rs @@ -0,0 +1,220 @@ +//! Handles dynamic library loading for proc macro + +use crate::{proc_macro::bridge, rustc_server::TokenStream}; +use std::fs::File; +use std::io::Read; +use std::path::Path; + +use goblin::{mach::Mach, Object}; +use libloading::Library; +use ra_proc_macro::ProcMacroKind; + +static NEW_REGISTRAR_SYMBOL: &str = "__rustc_proc_macro_decls_"; +static _OLD_REGISTRAR_SYMBOL: &str = "__rustc_derive_registrar_"; + +fn read_bytes(file: &Path) -> Option> { + let mut fd = File::open(file).ok()?; + let mut buffer = Vec::new(); + fd.read_to_end(&mut buffer).ok()?; + + Some(buffer) +} + +fn get_symbols_from_lib(file: &Path) -> Option> { + let buffer = read_bytes(file)?; + let object = Object::parse(&buffer).ok()?; + + return match object { + Object::Elf(elf) => { + let symbols = elf.dynstrtab.to_vec().ok()?; + let names = symbols.iter().map(|s| s.to_string()).collect(); + + Some(names) + } + + Object::PE(pe) => { + let symbol_names = + pe.exports.iter().flat_map(|s| s.name).map(|n| n.to_string()).collect(); + Some(symbol_names) + } + + Object::Mach(mach) => match mach { + Mach::Binary(binary) => { + let exports = binary.exports().ok()?; + let names = exports.iter().map(|s| s.name.clone()).collect(); + + Some(names) + } + + Mach::Fat(_) => None, + }, + + Object::Archive(_) | Object::Unknown(_) => None, + }; +} + +fn is_derive_registrar_symbol(symbol: &str) -> bool { + symbol.contains(NEW_REGISTRAR_SYMBOL) +} + +fn find_registrar_symbol(file: &Path) -> Option { + let symbols = get_symbols_from_lib(file)?; + + symbols.iter().find(|s| is_derive_registrar_symbol(s)).map(|s| s.to_string()) +} + +/// Loads dynamic library in platform dependent manner. +/// +/// For unix, you have to use RTLD_DEEPBIND flag to escape problems described +/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample) +/// and [here](https://github.com/rust-lang/rust/issues/60593). +/// +/// Usage of RTLD_DEEPBIND +/// [here](https://github.com/fedochet/rust-proc-macro-panic-inside-panic-expample/issues/1) +/// +/// It seems that on Windows that behaviour is default, so we do nothing in that case. +#[cfg(windows)] +fn load_library(file: &Path) -> Result { + Library::new(file) +} + +#[cfg(unix)] +fn load_library(file: &Path) -> Result { + use libloading::os::unix::Library as UnixLibrary; + use std::os::raw::c_int; + + const RTLD_NOW: c_int = 0x00002; + const RTLD_DEEPBIND: c_int = 0x00008; + + UnixLibrary::open(Some(file), RTLD_NOW | RTLD_DEEPBIND).map(|lib| lib.into()) +} + +struct ProcMacroLibraryLibloading { + // Hold the dylib to prevent it for unloadeding + #[allow(dead_code)] + lib: Library, + exported_macros: Vec, +} + +impl ProcMacroLibraryLibloading { + fn open(file: &Path) -> Result { + let symbol_name = find_registrar_symbol(file) + .ok_or(format!("Cannot find registrar symbol in file {:?}", file))?; + + let lib = load_library(file).map_err(|e| e.to_string())?; + + let exported_macros = { + let macros: libloading::Symbol<&&[bridge::client::ProcMacro]> = + unsafe { lib.get(symbol_name.as_bytes()) }.map_err(|e| e.to_string())?; + + macros.to_vec() + }; + + Ok(ProcMacroLibraryLibloading { lib, exported_macros }) + } +} + +type ProcMacroLibraryImpl = ProcMacroLibraryLibloading; + +pub struct Expander { + libs: Vec, +} + +impl Expander { + pub fn new>(lib: &P) -> Result { + let mut libs = vec![]; + + /* Some libraries for dynamic loading require canonicalized path (even when it is + already absolute + */ + let lib = + lib.as_ref().canonicalize().expect(&format!("Cannot canonicalize {:?}", lib.as_ref())); + + let library = ProcMacroLibraryImpl::open(&lib)?; + libs.push(library); + + Ok(Expander { libs }) + } + + pub fn expand( + &self, + macro_name: &str, + macro_body: &ra_tt::Subtree, + attributes: Option<&ra_tt::Subtree>, + ) -> Result { + let parsed_body = TokenStream::with_subtree(macro_body.clone()); + + let parsed_attributes = attributes + .map_or(crate::rustc_server::TokenStream::new(), |attr| { + TokenStream::with_subtree(attr.clone()) + }); + + for lib in &self.libs { + for proc_macro in &lib.exported_macros { + match proc_macro { + bridge::client::ProcMacro::CustomDerive { trait_name, client, .. } + if *trait_name == macro_name => + { + let res = client.run( + &crate::proc_macro::bridge::server::SameThread, + crate::rustc_server::Rustc::default(), + parsed_body, + ); + + return res.map(|it| it.subtree); + } + + bridge::client::ProcMacro::Bang { name, client } if *name == macro_name => { + let res = client.run( + &crate::proc_macro::bridge::server::SameThread, + crate::rustc_server::Rustc::default(), + parsed_body, + ); + + return res.map(|it| it.subtree); + } + + bridge::client::ProcMacro::Attr { name, client } if *name == macro_name => { + let res = client.run( + &crate::proc_macro::bridge::server::SameThread, + crate::rustc_server::Rustc::default(), + parsed_attributes, + parsed_body, + ); + + return res.map(|it| it.subtree); + } + + _ => { + continue; + } + } + } + } + + Err(bridge::PanicMessage::String("Nothing to expand".to_string())) + } + + pub fn list_macros(&self) -> Result, bridge::PanicMessage> { + let mut result = vec![]; + + for lib in &self.libs { + for proc_macro in &lib.exported_macros { + let res = match proc_macro { + bridge::client::ProcMacro::CustomDerive { trait_name, .. } => { + (trait_name.to_string(), ProcMacroKind::CustomDerive) + } + bridge::client::ProcMacro::Bang { name, .. } => { + (name.to_string(), ProcMacroKind::FuncLike) + } + bridge::client::ProcMacro::Attr { name, .. } => { + (name.to_string(), ProcMacroKind::Attr) + } + }; + result.push(res); + } + } + + Ok(result) + } +} diff --git a/crates/ra_proc_macro_srv/src/lib.rs b/crates/ra_proc_macro_srv/src/lib.rs index f376df236..f5a526dbf 100644 --- a/crates/ra_proc_macro_srv/src/lib.rs +++ b/crates/ra_proc_macro_srv/src/lib.rs @@ -17,6 +17,8 @@ mod proc_macro; #[doc(hidden)] mod rustc_server; +mod dylib; + use proc_macro::bridge::client::TokenStream; use ra_proc_macro::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask}; diff --git a/crates/ra_proc_macro_srv/src/rustc_server.rs b/crates/ra_proc_macro_srv/src/rustc_server.rs index 92d1fd989..ec0d35692 100644 --- a/crates/ra_proc_macro_srv/src/rustc_server.rs +++ b/crates/ra_proc_macro_srv/src/rustc_server.rs @@ -34,6 +34,10 @@ impl TokenStream { TokenStream { subtree: Default::default() } } + pub fn with_subtree(subtree: tt::Subtree) -> Self { + TokenStream { subtree } + } + pub fn is_empty(&self) -> bool { self.subtree.token_trees.is_empty() } -- cgit v1.2.3