From 87b9c092fb15d97c2b62530c7c728947718d04b0 Mon Sep 17 00:00:00 2001 From: bjorn3 <17426603+bjorn3@users.noreply.github.com> Date: Fri, 22 Mar 2024 20:11:32 +0000 Subject: [PATCH 1/2] Remove support for decompressing dylib metadata We haven't been compressing dylib metadata for a while now. Removing decompression support will regress error messages about an incompatible rustc version being used, but dylibs are pretty rare anyway. --- Cargo.lock | 7 ------- compiler/rustc_metadata/Cargo.toml | 1 - compiler/rustc_metadata/src/locator.rs | 29 ++++---------------------- src/tools/tidy/src/deps.rs | 2 -- 4 files changed, 4 insertions(+), 35 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index fc16ccf0a67..e4466a1da0d 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -4004,7 +4004,6 @@ dependencies = [ "rustc_span", "rustc_target", "rustc_type_ir", - "snap", "tempfile", "tracing", ] @@ -4889,12 +4888,6 @@ version = "1.13.2" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67" -[[package]] -name = "snap" -version = "1.1.1" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "1b6b67fb9a61334225b5b790716f609cd58395f895b3fe8b328786812a40bc3b" - [[package]] name = "socket2" version = "0.5.7" diff --git a/compiler/rustc_metadata/Cargo.toml b/compiler/rustc_metadata/Cargo.toml index 3b0151b1f94..cece700b4dd 100644 --- a/compiler/rustc_metadata/Cargo.toml +++ b/compiler/rustc_metadata/Cargo.toml @@ -27,7 +27,6 @@ rustc_session = { path = "../rustc_session" } rustc_span = { path = "../rustc_span" } rustc_target = { path = "../rustc_target" } rustc_type_ir = { path = "../rustc_type_ir" } -snap = "1" tempfile = "3.2" tracing = "0.1" # tidy-alphabetical-end diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs index a4a69ae9514..f924ed48b6f 100644 --- a/compiler/rustc_metadata/src/locator.rs +++ b/compiler/rustc_metadata/src/locator.rs @@ -213,7 +213,7 @@ //! metadata::locator or metadata::creader for all the juicy details! use std::borrow::Cow; -use std::io::{Read, Result as IoResult, Write}; +use std::io::{Result as IoResult, Write}; use std::ops::Deref; use std::path::{Path, PathBuf}; use std::{cmp, fmt}; @@ -232,7 +232,6 @@ use rustc_session::utils::CanonicalizedPath; use rustc_span::Span; use rustc_span::symbol::Symbol; use rustc_target::spec::{Target, TargetTriple}; -use snap::read::FrameDecoder; use tracing::{debug, info}; use crate::creader::{Library, MetadataLoader}; @@ -792,7 +791,6 @@ fn get_metadata_section<'p>( CrateFlavor::Dylib => { let buf = loader.get_dylib_metadata(target, filename).map_err(MetadataError::LoadFailure)?; - // The header is uncompressed let header_len = METADATA_HEADER.len(); // header + u64 length of data let data_start = header_len + 8; @@ -806,7 +804,7 @@ fn get_metadata_section<'p>( ))); } - // Length of the compressed stream - this allows linkers to pad the section if they want + // Length of the metadata - this allows linkers to pad the section if they want let Ok(len_bytes) = <[u8; 8]>::try_from(&buf[header_len..cmp::min(data_start, buf.len())]) else { @@ -814,29 +812,10 @@ fn get_metadata_section<'p>( "invalid metadata length found".to_string(), )); }; - let compressed_len = u64::from_le_bytes(len_bytes) as usize; + let metadata_len = u64::from_le_bytes(len_bytes) as usize; // Header is okay -> inflate the actual metadata - let compressed_bytes = buf.slice(|buf| &buf[data_start..(data_start + compressed_len)]); - if &compressed_bytes[..cmp::min(METADATA_HEADER.len(), compressed_bytes.len())] - == METADATA_HEADER - { - // The metadata was not actually compressed. - compressed_bytes - } else { - debug!("inflating {} bytes of compressed metadata", compressed_bytes.len()); - // Assume the decompressed data will be at least the size of the compressed data, so we - // don't have to grow the buffer as much. - let mut inflated = Vec::with_capacity(compressed_bytes.len()); - FrameDecoder::new(&*compressed_bytes).read_to_end(&mut inflated).map_err(|_| { - MetadataError::LoadFailure(format!( - "failed to decompress metadata: {}", - filename.display() - )) - })?; - - slice_owned(inflated, Deref::deref) - } + buf.slice(|buf| &buf[data_start..(data_start + metadata_len)]) } CrateFlavor::Rmeta => { // mmap the file, because only a small fraction of it is read. diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs index 5163f039a23..2c735b5f723 100644 --- a/src/tools/tidy/src/deps.rs +++ b/src/tools/tidy/src/deps.rs @@ -100,7 +100,6 @@ const EXCEPTIONS: ExceptionList = &[ ("rustc_apfloat", "Apache-2.0 WITH LLVM-exception"), // rustc (license is the same as LLVM uses) ("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0 // cargo/... (because of serde) ("self_cell", "Apache-2.0"), // rustc (fluent translations) - ("snap", "BSD-3-Clause"), // rustc ("wasi-preview1-component-adapter-provider", "Apache-2.0 WITH LLVM-exception"), // rustc // tidy-alphabetical-end ]; @@ -390,7 +389,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[ "sharded-slab", "shlex", "smallvec", - "snap", "stable_deref_trait", "stacker", "static_assertions", From 3cc0ba83379e914fc34d934034ba575451cd9526 Mon Sep 17 00:00:00 2001 From: bjorn3 <17426603+bjorn3@users.noreply.github.com> Date: Thu, 31 Oct 2024 12:18:20 +0000 Subject: [PATCH 2/2] Remove support for compressed dylib metadata from rust-analyzer --- src/tools/rust-analyzer/Cargo.lock | 7 ------- src/tools/rust-analyzer/Cargo.toml | 1 - .../crates/proc-macro-srv/Cargo.toml | 1 - .../crates/proc-macro-srv/src/dylib/version.rs | 17 ++++------------- src/tools/tidy/src/deps.rs | 1 - 5 files changed, 4 insertions(+), 23 deletions(-) diff --git a/src/tools/rust-analyzer/Cargo.lock b/src/tools/rust-analyzer/Cargo.lock index 695c37f6d7b..424357e8473 100644 --- a/src/tools/rust-analyzer/Cargo.lock +++ b/src/tools/rust-analyzer/Cargo.lock @@ -1364,7 +1364,6 @@ dependencies = [ "proc-macro-api", "proc-macro-test", "ra-ap-rustc_lexer", - "snap", "span", "stdx", "syntax-bridge", @@ -1888,12 +1887,6 @@ dependencies = [ "serde", ] -[[package]] -name = "snap" -version = "1.1.1" -source = "registry+https://github.com/rust-lang/crates.io-index" -checksum = "1b6b67fb9a61334225b5b790716f609cd58395f895b3fe8b328786812a40bc3b" - [[package]] name = "span" version = "0.0.0" diff --git a/src/tools/rust-analyzer/Cargo.toml b/src/tools/rust-analyzer/Cargo.toml index 3aa93b7b7b4..1099d2cb918 100644 --- a/src/tools/rust-analyzer/Cargo.toml +++ b/src/tools/rust-analyzer/Cargo.toml @@ -145,7 +145,6 @@ smallvec = { version = "1.10.0", features = [ "const_generics", ] } smol_str = "0.3.2" -snap = "1.1.0" text-size = "1.1.1" tracing = "0.1.40" tracing-tree = "0.3.0" diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml b/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml index e8d9677c928..4fabcc90067 100644 --- a/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml +++ b/src/tools/rust-analyzer/crates/proc-macro-srv/Cargo.toml @@ -16,7 +16,6 @@ doctest = false object.workspace = true libloading.workspace = true memmap2.workspace = true -snap.workspace = true stdx.workspace = true tt.workspace = true diff --git a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs index 1f7ef7914ba..7f0e95c50de 100644 --- a/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs +++ b/src/tools/rust-analyzer/crates/proc-macro-srv/src/dylib/version.rs @@ -8,7 +8,6 @@ use std::{ use memmap2::Mmap; use object::read::{File as BinaryFile, Object, ObjectSection}; use paths::AbsPath; -use snap::read::FrameDecoder as SnapDecoder; #[derive(Debug)] #[allow(dead_code)] @@ -123,9 +122,8 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result { let version = u32::from_be_bytes([dot_rustc[4], dot_rustc[5], dot_rustc[6], dot_rustc[7]]); // Last supported version is: // https://github.com/rust-lang/rust/commit/b94cfefc860715fb2adf72a6955423d384c69318 - let (snappy_portion, bytes_before_version) = match version { - 5 | 6 => (&dot_rustc[8..], 13), - 7 | 8 => { + let (mut metadata_portion, bytes_before_version) = match version { + 8 => { let len_bytes = &dot_rustc[8..12]; let data_len = u32::from_be_bytes(len_bytes.try_into().unwrap()) as usize; (&dot_rustc[12..data_len + 12], 13) @@ -143,13 +141,6 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result { } }; - let mut uncompressed: Box = if &snappy_portion[0..4] == b"rust" { - // Not compressed. - Box::new(snappy_portion) - } else { - Box::new(SnapDecoder::new(snappy_portion)) - }; - // We're going to skip over the bytes before the version string, so basically: // 8 bytes for [b'r',b'u',b's',b't',0,0,0,5] // 4 or 8 bytes for [crate root bytes] @@ -157,11 +148,11 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result { // so 13 or 17 bytes in total, and we should check the last of those bytes // to know the length let mut bytes = [0u8; 17]; - uncompressed.read_exact(&mut bytes[..bytes_before_version])?; + metadata_portion.read_exact(&mut bytes[..bytes_before_version])?; let length = bytes[bytes_before_version - 1]; let mut version_string_utf8 = vec![0u8; length as usize]; - uncompressed.read_exact(&mut version_string_utf8)?; + metadata_portion.read_exact(&mut version_string_utf8)?; let version_string = String::from_utf8(version_string_utf8); version_string.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, e)) } diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs index 2c735b5f723..60fec84cc9d 100644 --- a/src/tools/tidy/src/deps.rs +++ b/src/tools/tidy/src/deps.rs @@ -161,7 +161,6 @@ const EXCEPTIONS_RUST_ANALYZER: ExceptionList = &[ ("rustc_apfloat", "Apache-2.0 WITH LLVM-exception"), ("ryu", "Apache-2.0 OR BSL-1.0"), // BSL is not acceptble, but we use it under Apache-2.0 ("scip", "Apache-2.0"), - ("snap", "BSD-3-Clause"), // tidy-alphabetical-end ];