rust/library/std/src/rt.rs, branch 1.89.0https://github.com/rust-lang/rust
http://git.dreamy.place/mirrors/rust/atom?h=1.89.02025-05-15T09:20:13+00:00deduplicate abort implementations2025-05-15T09:20:13+00:00joboetjonasboettiger@icloud.com2025-03-29T11:16:49+00:00urn:sha1:b7f2cd3a2b1606934018cc64bac52bb887ea892a
Currently, the code for process aborts is duplicated across `panic_abort` and `std`. This PR uses `#[rustc_std_internal_symbol]` to make the `std` implementation available to `panic_abort` via the linker, thereby deduplicating the code.
rtprintpanic: clarify that the error is aborting the process2025-04-18T13:02:22+00:00Lieselotte52315535+she3py@users.noreply.github.com2025-04-18T13:02:22+00:00urn:sha1:17b7d63fd787699dac3fffbf9930dc799291a5f2Rollup merge of #135446 - klensy:panic_immediate_abort_ext, r=Mark-Simulacrum2025-01-20T04:38:32+00:00许杰友 Jieyou Xu (Joe)39484203+jieyouxu@users.noreply.github.com2025-01-20T04:38:32+00:00urn:sha1:e5b85035fefb37b5f314ca0f07a5560de6ed0a0c
further improve panic_immediate_abort by removing rtprintpanic! messages
Reduces binary size using `panic_immediate_abort` by removing strings used by `rtprintpanic!`.
for `main.rs`
```rust
fn main() {
println!("Hello, world!");
}
```
with `Cargo.toml`
```toml
[package]
name = "tst"
version = "0.1.0"
edition = "2024"
[dependencies]
[profile.release]
lto = true
codegen-units = 1
panic = "abort"
```
and build with `RUSTFLAGS="-Zlocation-detail=none -Zfmt-debug=none" cargo +stage-1 b -r -Z build-std=std,panic_abort -Z build-std-features=optimize_for_size,panic_immediate_abort` for `x86_64-unknown-linux-gnu`
This reduces size:
| before | after | type |
| - | - | - |
| 25256 | 21880 | unstripped |
| 18072 | 15288 | stripped |
std: lazily allocate the main thread handle2025-01-14T12:37:28+00:00joboetjonasboettiger@icloud.com2024-11-25T12:01:35+00:00urn:sha1:14f7f4b7bfcfbfe9a6f778e762cac83420e08007
Thereby, we also allow accessing thread::current before main: as the runtime no longer tries to install its own handle, this will no longer trigger an abort. Rather, the name returned from name will only be "main" after the runtime initialization code has run, but I think that is acceptable.
This new approach also requires some changes to the signal handling code, as calling `thread::current` would now allocate when called on the main thread, which is not acceptable. I fixed this by adding a new function (`with_current_name`) that performs all the naming logic without allocation or without initializing the thread ID (which could allocate on some platforms).
Revert "Remove the Arc rt::init allocation for thread info"2025-01-14T12:37:25+00:00joboetjonasboettiger@icloud.com2024-11-25T08:50:24+00:00urn:sha1:0e5ee891b2b07321175e398153bfa86c667f3494
This reverts commit 0747f2898e83df7e601189c0f31762e84328becb.
further improve panic_immediate_abort by removing rtprintpanic messages2025-01-13T18:11:42+00:00klensyklensy@users.noreply.github.com2025-01-13T18:00:57+00:00urn:sha1:3a0554a44578afb2f69babdae39f8880d23560aeavoid nesting the user-defined main so deeply on the stack2025-01-11T14:53:42+00:00Ralf Jungpost@ralfj.de2025-01-11T14:43:43+00:00urn:sha1:471d8301066815613e4c468b9fbbf7286fb4cfe6use a single large catch_unwind in lang_start2025-01-11T14:50:53+00:00Ralf Jungpost@ralfj.de2025-01-11T09:35:00+00:00urn:sha1:9f7fe81d53b421e946c1b9ab35d43920428deb94Remove the Arc rt::init allocation for thread info2024-10-19T13:39:20+00:00GnomedDevdavid2005thomas@gmail.com2024-10-16T20:10:24+00:00urn:sha1:0747f2898e83df7e601189c0f31762e84328becbstd: fix stdout-before-main2024-10-12T11:01:36+00:00joboetjonasboettiger@icloud.com2024-10-12T11:01:36+00:00urn:sha1:9f91c5099fb7261cf8c85cc638d2692a317060ec
Fixes #130210.
Since #124881, `ReentrantLock` uses `ThreadId` to identify threads. This has the unfortunate consequence of breaking uses of `Stdout` before main: Locking the `ReentrantLock` that synchronizes the output will initialize the thread ID before the handle for the main thread is set in `rt::init`. But since that would overwrite the current thread ID, `thread::set_current` triggers an abort.
This PR fixes the problem by using the already initialized thread ID for constructing the main thread handle and allowing `set_current` calls that do not change the thread's ID.