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Description
Consider the code below. At the first glace, it looks like RVO/destination propagation isn't applied, resulting in a stack overflow.
File structure
tree .
.
├── bin
│ └── rvo.rs
├── Cargo.toml
├── src
│ └── lib.rs
Code
Cargo.toml
[package]
name = "rvo"
version = "0.1.0"
edition = "2021"
[[bin]]
name = "rvo"
path = "bin/rvo.rs"
[dependencies]
[profile.release]
lto = "fat"bin/rvo.rs
use rvo::Outer;
fn main() {
let _foo = Box::new(Outer::new());
}src/lib.rs
#![allow(unused)]
const SIZE: usize = 1024 * 1024 * 1024;
pub struct Outer {
a: LargeStruct,
}
impl Outer {
#[inline(always)]
pub fn new() -> Self {
let a = LargeStruct::new();
Self { a }
}
}
pub struct LargeStruct {
d0: Option<Box<u128>>,
d1: Option<Box<u128>>,
d2: Option<Box<u128>>,
d3: Option<Box<u128>>,
d4: Option<Box<u128>>,
huge: [u8; SIZE],
}
impl LargeStruct {
#[inline(always)]
pub fn new() -> Self {
Self {
d0: None,
d1: None,
d2: None,
d3: None,
d4: None,
huge: [0; SIZE],
}
}
}Running cargo run --release results in:
Finished release [optimized] target(s) in 0.01s
Running `target/release/rvo`
thread 'main' has overflowed its stack
fatal runtime error: stack overflow
Aborted (core dumped)
Compiler version:
rustc --version --verbose
rustc 1.73.0 (cc66ad468 2023-10-03)
binary: rustc
commit-hash: cc66ad468955717ab92600c770da8c1601a4ff33
commit-date: 2023-10-03
host: x86_64-unknown-linux-gnu
release: 1.73.0
LLVM version: 17.0.2