Mostly safe wrapper for alloca
License: MIT License
Mostly safe no_std wrapper for alloca in Rust.
This crate uses Rust lifetime system to ensure that stack allocated memory will not be used after function return, but it does not make any guarantee about memory that is turned into raw pointer and stored somewhere else.
fn main() {
// allocate 128 bytes on the stack
alloca::with_alloca(128, |memory| {
// memory: &mut [MaybeUninit<u8>]
assert_eq!(memory.len(), 128);
});
}
Found by matt1992 on Rust community discord server.
Potential solutions:
size_of::<T> to 16 bytes.There's a CI that fails compiling.
https://github.com/bheisler/criterion.rs/actions/runs/5087853945/jobs/9143622887?pr=686
I'm not sure how to handle that on wasm. Probably put it behind a conditional compilation block, to not use alloca.
I think compilation failing would still be a blocker, since the crate will still be compiled.
cargo build --target=wasm32-wasi
➜ alloca-rs git:(main) cargo build --target=wasm32-wasi
Downloaded cc v1.0.66
Downloaded 1 crate (53.5 KB) in 1.23s
Compiling cc v1.0.66
Compiling alloca v0.3.3 (/home/pascal/LinuxData/Development/alloca-rs)
The following warnings were emitted during compilation:
warning: In file included from alloca_.c:2:
warning: /usr/lib/clang/15.0.7/include/inttypes.h:21:15: fatal error: 'inttypes.h' file not found
warning: #include_next <inttypes.h>
warning: ^~~~~~~~~~~~
warning: 1 error generated.
error: failed to run custom build command for `alloca v0.3.3 (/home/pascal/LinuxData/Development/alloca-rs)`
Caused by:
process didn't exit successfully: `/home/pascal/LinuxData/Development/alloca-rs/target/debug/build/alloca-3a7601d31ad37651/build-script-build` (exit status: 1)
--- stdout
TARGET = Some("wasm32-wasi")
HOST = Some("x86_64-unknown-linux-gnu")
CC_wasm32-wasi = None
CC_wasm32_wasi = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-wasi = None
CFLAGS_wasm32_wasi = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("true")
running: "clang" "-O2" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-wasi" "-Wall" "-Wextra" "-o" "/home/pascal/LinuxData/Development/alloca-rs/target/wasm32-wasi/debug/build/alloca-7637b6b4aaef8e8b/out/alloca_.o" "-c" "alloca_.c"
cargo:warning=In file included from alloca_.c:2:
cargo:warning=/usr/lib/clang/15.0.7/include/inttypes.h:21:15: fatal error: 'inttypes.h' file not found
cargo:warning=#include_next <inttypes.h>
cargo:warning= ^~~~~~~~~~~~
cargo:warning=1 error generated.
exit status: 1
--- stderr
error occurred: Command "clang" "-O2" "-ffunction-sections" "-fdata-sections" "-fPIC" "-g" "-fno-omit-frame-pointer" "--target=wasm32-wasi" "-Wall" "-Wextra" "-o" "/home/pascal/LinuxData/Development/alloca-rs/target/wasm32-wasi/debug/build/alloca-7637b6b4aaef8e8b/out/alloca_.o" "-c" "alloca_.c" with args "clang" did not execute successfully (status code exit status: 1).
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