mirror of
https://github.com/rust-lang/rust-analyzer
synced 2024-12-25 04:23:25 +00:00
Read version of rustc that compiled proc macro
With Jay Somedon <jay.somedon@outlook.com>
This commit is contained in:
Jay Somedon
Edwin Cheng
parent
7275750e42
commit
6608acef71
3 changed files with 100 additions and 12 deletions
28
Cargo.lock
generated
28
Cargo.lock
generated
|
|
@ -80,7 +80,7 @@ dependencies = [
|
|||
"cfg-if",
|
||||
"libc",
|
||||
"miniz_oxide",
|
||||
"object",
|
||||
"object 0.23.0",
|
||||
"rustc-demangle",
|
||||
]
|
||||
|
||||
|
|
@ -1008,6 +1008,16 @@ dependencies = [
|
|||
"libc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "object"
|
||||
version = "0.22.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8d3b63360ec3cb337817c2dbd47ab4a0f170d285d8e5a2064600f3def1402397"
|
||||
dependencies = [
|
||||
"flate2",
|
||||
"wasmparser",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "object"
|
||||
version = "0.23.0"
|
||||
|
|
@ -1154,8 +1164,10 @@ dependencies = [
|
|||
"crossbeam-channel",
|
||||
"jod-thread",
|
||||
"log",
|
||||
"object 0.22.0",
|
||||
"serde",
|
||||
"serde_json",
|
||||
"snap",
|
||||
"stdx",
|
||||
"tt",
|
||||
]
|
||||
|
|
@ -1168,7 +1180,7 @@ dependencies = [
|
|||
"libloading",
|
||||
"mbe",
|
||||
"memmap2",
|
||||
"object",
|
||||
"object 0.23.0",
|
||||
"proc_macro_api",
|
||||
"proc_macro_test",
|
||||
"serde_derive",
|
||||
|
|
@ -1540,6 +1552,12 @@ dependencies = [
|
|||
"serde",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "snap"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dc725476a1398f0480d56cd0ad381f6f32acf2642704456f8f59a35df464b59a"
|
||||
|
||||
[[package]]
|
||||
name = "socket2"
|
||||
version = "0.3.19"
|
||||
|
|
@ -1880,6 +1898,12 @@ dependencies = [
|
|||
"winapi-util",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasmparser"
|
||||
version = "0.57.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32fddd575d477c6e9702484139cf9f23dcd554b06d185ed0f56c857dd3a47aa6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
|
|
|
|||
|
|
@ -19,3 +19,5 @@ jod-thread = "0.1.1"
|
|||
tt = { path = "../tt", version = "0.0.0" }
|
||||
base_db = { path = "../base_db", version = "0.0.0" }
|
||||
stdx = { path = "../stdx", version = "0.0.0" }
|
||||
snap = "1"
|
||||
object = "0.22.0"
|
||||
|
|
|
|||
|
|
@ -5,16 +5,11 @@
|
|||
//! is used to provide basic infrastructure for communication between two
|
||||
//! processes: Client (RA itself), Server (the external program)
|
||||
|
||||
mod rpc;
|
||||
mod process;
|
||||
pub mod msg;
|
||||
mod process;
|
||||
mod rpc;
|
||||
|
||||
use std::{
|
||||
ffi::OsStr,
|
||||
io,
|
||||
path::{Path, PathBuf},
|
||||
sync::Arc,
|
||||
};
|
||||
use std::{ffi::OsStr, fs::read as fsread, io::{self, Read}, path::{Path, PathBuf}, sync::Arc};
|
||||
|
||||
use base_db::{Env, ProcMacro};
|
||||
use tt::{SmolStr, Subtree};
|
||||
|
|
@ -23,6 +18,9 @@ use crate::process::{ProcMacroProcessSrv, ProcMacroProcessThread};
|
|||
|
||||
pub use rpc::{ExpansionResult, ExpansionTask, ListMacrosResult, ListMacrosTask, ProcMacroKind};
|
||||
|
||||
use object::read::{File as BinaryFile, Object, ObjectSection};
|
||||
use snap::read::FrameDecoder as SnapDecoder;
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
struct ProcMacroProcessExpander {
|
||||
process: Arc<ProcMacroProcessSrv>,
|
||||
|
|
@ -71,7 +69,10 @@ impl ProcMacroClient {
|
|||
args: impl IntoIterator<Item = impl AsRef<OsStr>>,
|
||||
) -> io::Result<ProcMacroClient> {
|
||||
let (thread, process) = ProcMacroProcessSrv::run(process_path, args)?;
|
||||
Ok(ProcMacroClient { process: Arc::new(process), thread })
|
||||
Ok(ProcMacroClient {
|
||||
process: Arc::new(process),
|
||||
thread,
|
||||
})
|
||||
}
|
||||
|
||||
pub fn by_dylib_path(&self, dylib_path: &Path) -> Vec<ProcMacro> {
|
||||
|
|
@ -98,8 +99,69 @@ impl ProcMacroClient {
|
|||
dylib_path: dylib_path.into(),
|
||||
});
|
||||
|
||||
ProcMacro { name, kind, expander }
|
||||
ProcMacro {
|
||||
name,
|
||||
kind,
|
||||
expander,
|
||||
}
|
||||
})
|
||||
.collect()
|
||||
}
|
||||
|
||||
// This is used inside self.read_version() to locate the ".rustc" section
|
||||
// from a proc macro crate's binary file.
|
||||
fn read_section<'a>(&self, dylib_binary: &'a [u8], section_name: &str) -> &'a [u8] {
|
||||
BinaryFile::parse(dylib_binary)
|
||||
.unwrap()
|
||||
.section_by_name(section_name)
|
||||
.unwrap()
|
||||
.data()
|
||||
.unwrap()
|
||||
}
|
||||
|
||||
// Check the version of rustc that was used to compile a proc macro crate's
|
||||
// binary file.
|
||||
// A proc macro crate binary's ".rustc" section has following byte layout:
|
||||
// * [b'r',b'u',b's',b't',0,0,0,5] is the first 8 bytes
|
||||
// * ff060000 734e6150 is followed, it's the snappy format magic bytes,
|
||||
// means bytes from here(including this sequence) are compressed in
|
||||
// snappy compression format. Version info is here inside, so decompress
|
||||
// this.
|
||||
// The bytes you get after decompressing the snappy format portion has
|
||||
// following layout:
|
||||
// * [b'r',b'u',b's',b't',0,0,0,5] is the first 8 bytes(again)
|
||||
// * [crate root bytes] next 4 bytes is to store crate root position,
|
||||
// according to rustc's source code comment
|
||||
// * [length byte] next 1 byte tells us how many bytes we should read next
|
||||
// for the version string's utf8 bytes
|
||||
// * [version string bytes encoded in utf8] <- GET THIS BOI
|
||||
// * [some more bytes that we don really care but still there] :-)
|
||||
// Check this issue for more about the bytes layout:
|
||||
// https://github.com/rust-analyzer/rust-analyzer/issues/6174
|
||||
fn read_version(&self, dylib_path: &Path) -> String {
|
||||
let dylib_binary = fsread(dylib_path).unwrap();
|
||||
|
||||
let dot_rustc = self.read_section(&dylib_binary, ".rustc");
|
||||
|
||||
let snappy_portion = &dot_rustc[8..];
|
||||
|
||||
let mut snappy_decoder = SnapDecoder::new(snappy_portion);
|
||||
|
||||
// the bytes before version string bytes, so this basically is:
|
||||
// 8 bytes for [b'r',b'u',b's',b't',0,0,0,5]
|
||||
// 4 bytes for [crate root bytes]
|
||||
// 1 byte for length of version string
|
||||
// so 13 bytes in total, and we should check the 13th byte
|
||||
// to know the length
|
||||
let mut bytes_before_version = [0u8; 13];
|
||||
snappy_decoder
|
||||
.read_exact(&mut bytes_before_version)
|
||||
.unwrap();
|
||||
let length = bytes_before_version[12]; // what? can't use -1 indexing?
|
||||
|
||||
let mut version_string_utf8 = vec![0u8; length as usize];
|
||||
snappy_decoder.read_exact(&mut version_string_utf8).unwrap();
|
||||
let version_string = String::from_utf8(version_string_utf8).unwrap();
|
||||
version_string
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue