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Issues list

Exception handling instructions emitted on wasm even when exception-handling feature is disabled A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-bug Category: This is a bug. F-c_unwind `#![feature(c_unwind)]` O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140293 opened Apr 25, 2025 by bjorn3
2
Many new wasm features are enabled if compile wasm32v1-none with -C linker-plugin-lto flag on LLVM 20+ A-linkers Area: linkers... you gotta love linkers A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-LTO Area: Link-time optimization (LTO) C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140174 opened Apr 22, 2025 by StackOverflowExcept1on
3
Tracking issue for wasm32-unknown-unknown's future-incompat warning for C ABI changes A-ABI Area: Concerning the application binary interface (ABI) C-future-incompatibility Category: Future-incompatibility lints C-tracking-issue Category: An issue tracking the progress of sth. like the implementation of an RFC O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#138762 opened Mar 21, 2025 by alexcrichton
8
Run TLS destructors for wasm32-wasip1-threads make Node.js stuck A-thread-locals Area: Thread local storage (TLS) C-bug Category: This is a bug. O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-libs Relevant to the library team, which will review and decide on the PR/issue.
#137510 opened Feb 24, 2025 by Brooooooklyn
20
fix for issue 132802: x86 code in wasm32-unknown-unknown binaries A-run-make Area: port run-make Makefiles to rmake.rs A-testsuite Area: The testsuite used to check the correctness of rustc O-wasm Target: WASM (WebAssembly), http://webassembly.org/ S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-infra Relevant to the infrastructure team, which will review and decide on the PR/issue.
#137457 opened Feb 23, 2025 by JayAndJef Loading…
@Kobzol
75
With LLVM 20 the SIMD intrinsic wasm32::u8x16_sub_sat is compiled to a function call A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. O-wasm Target: WASM (WebAssembly), http://webassembly.org/
#137419 opened Feb 22, 2025 by hkratz
1
2
Moving WebAssembly inline assembly forward A-inline-assembly Area: Inline assembly (`asm!(…)`) C-discussion Category: Discussion or questions that doesn't represent real issues. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136382 opened Feb 1, 2025 by tgross35
16
Start using pattern types in libcore O-unix Operating system: Unix-like O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ S-blocked Status: Blocked on something else such as an RFC or other implementation work. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#136006 opened Jan 24, 2025 by oli-obk Loading…
73
LLVM assertion failure on Wasm exceptions A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-emscripten Target: 50% off wasm32-unknown-musl. the savings come out of stdio.h, but hey, you get SDL! O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#135665 opened Jan 18, 2025 by purplesyringa
21
Remove wasm legacy abi A-ABI Area: Concerning the application binary interface (ABI) O-wasm Target: WASM (WebAssembly), http://webassembly.org/ S-blocked Status: Blocked on something else such as an RFC or other implementation work. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#133952 opened Dec 6, 2024 by bjorn3 • Draft
4
@alexcrichton @workingjubilee
11
std::arch::wasm::unreachable() is stable but does not compile A-diagnostics Area: Messages for errors, warnings, and lints A-stability Area: `#[stable]`, `#[unstable]` etc. D-imprecise-spans Diagnostics: spans don't point to exactly the erroneous code D-papercut Diagnostics: An error or lint that needs small tweaks. O-wasm Target: WASM (WebAssembly), http://webassembly.org/
#133015 opened Nov 13, 2024 by eric-seppanen
9
Official binaries for wasm32-unknown-unknown (and potentially other WASM platforms?) contain code for the wrong architecture C-bug Category: This is a bug. E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)
#132802 opened Nov 9, 2024 by emilazy
@JayAndJef
12
WASI unwinding is broken in release A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-panic Area: Panicking machinery C-bug Category: This is a bug. I-miscompile Issue: Correct Rust code lowers to incorrect machine code O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ P-medium Medium priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-libs Relevant to the library team, which will review and decide on the PR/issue.
#132416 opened Oct 31, 2024 by purplesyringa
30
wasm32_wasip1_threads's llvm_target is mistake A-linkage Area: linking into static, shared libraries and binaries C-bug Category: This is a bug. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131007 opened Sep 29, 2024 by oligamiq
7
wasm32-wasip1 depends on libc memset with no_std C-discussion Category: Discussion or questions that doesn't represent real issues. O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#130621 opened Sep 20, 2024 by drebbe-intrepid
16
wasip2 target should not conditionally feature gate stdlib APIs C-bug Category: This is a bug. F-wasip2 `#[feature(wasip2)]` O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#130323 opened Sep 13, 2024 by Manishearth
5
Wasm ABI special cases scalar pairs (against tool conventions) and is not documented A-ABI Area: Concerning the application binary interface (ABI) A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools C-bug Category: This is a bug. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129486 opened Aug 23, 2024 by Manishearth
1
11
wasip2 uses wasi:random/random to generate hashmap_random_keys O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/
#129402 opened Aug 22, 2024 by juntyr
1
Wasm32 miscompilation when using u128 with multivalue and optimizations A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-external-bug Category: issue that is caused by bugs in software beyond our control I-miscompile Issue: Correct Rust code lowers to incorrect machine code I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-wasm Target: WASM (WebAssembly), http://webassembly.org/ P-high High priority S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#127318 opened Jul 4, 2024 by arriven
7
Build fail for WebAssembly on Windows with wasm-pack C-bug Category: This is a bug. O-wasm Target: WASM (WebAssembly), http://webassembly.org/
#126790 opened Jun 21, 2024 by zmalbert
1
Undefined behavior from stack overflow on wasm32 targets C-bug Category: This is a bug. E-needs-design This issue needs exploration and design to see how and if we can fix/implement it I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-wasm Target: WASM (WebAssembly), http://webassembly.org/ P-high High priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#126747 opened Jun 20, 2024 by adambratschikaye
5
Support for 'split-debuginfo' on wasm targets C-feature-request Category: A feature request, i.e: not implemented / a PR. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125894 opened Jun 2, 2024 by namse
1
WASM+simd128 codegen of a.simd_eq(Simd::splat(b)).any() deteriorates as width increases A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-SIMD Area: SIMD (Single Instruction Multiple Data) C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. O-wasm Target: WASM (WebAssembly), http://webassembly.org/ PG-portable-simd Project group: Portable SIMD (https://github.com/rust-lang/project-portable-simd) requires-nightly This issue requires a nightly compiler in some way. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue
#122623 opened Mar 17, 2024 by alion02
2
wasm-pack example doesn't compile A-diagnostics Area: Messages for errors, warnings, and lints A-linkage Area: linking into static, shared libraries and binaries C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ O-wasm Target: WASM (WebAssembly), http://webassembly.org/ S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#122333 opened Mar 11, 2024 by tstachl
11
Clang vs wasm32-{emscripten,wasi} rustc C ABI mismatch w.r.t. "singleton" unions A-ABI Area: Concerning the application binary interface (ABI) C-bug Category: This is a bug. I-miscompile Issue: Correct Rust code lowers to incorrect machine code I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness O-wasm Target: WASM (WebAssembly), http://webassembly.org/ P-medium Medium priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121408 opened Feb 21, 2024 by hanna-kruppe
10
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