From ad34e79bb9818cc9bf3d0cf746bd052a67c7bab9 Mon Sep 17 00:00:00 2001 From: Edwin Cheng Date: Wed, 10 Mar 2021 04:54:31 +0800 Subject: use doc-comments --- crates/proc_macro_api/src/version.rs | 43 ++++++++++++++++++------------------ 1 file changed, 22 insertions(+), 21 deletions(-) (limited to 'crates/proc_macro_api/src') diff --git a/crates/proc_macro_api/src/version.rs b/crates/proc_macro_api/src/version.rs index 80cd183a0..11a7fb59a 100644 --- a/crates/proc_macro_api/src/version.rs +++ b/crates/proc_macro_api/src/version.rs @@ -64,8 +64,8 @@ pub(crate) fn read_info(dylib_path: &Path) -> io::Result { Ok(RustCInfo { version, channel, commit, date }) } -// This is used inside read_version() to locate the ".rustc" section -// from a proc macro crate's binary file. +/// This is used inside read_version() to locate the ".rustc" section +/// from a proc macro crate's binary file. fn read_section<'a>(dylib_binary: &'a [u8], section_name: &str) -> io::Result<&'a [u8]> { BinaryFile::parse(dylib_binary) .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e))? @@ -75,25 +75,26 @@ fn read_section<'a>(dylib_binary: &'a [u8], section_name: &str) -> io::Result<&' .map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)) } -// 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 inside here, 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 +/// 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 inside here, 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(dylib_path: &Path) -> io::Result { let dylib_file = File::open(dylib_path)?; let dylib_mmaped = unsafe { Mmap::map(&dylib_file) }?; -- cgit v1.2.3