bytecodealliance/wasmtime

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A lightweight WebAssembly runtime that is fast, secure, and standards-compliant

Stars: 18.6k
Forks: 1.8k
Open beginner issues: 0
Indexed issues: 770
Avg merge: 1d 14h
Merged PRs (30d): 135

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 14, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Open All

762 open issues indexed

Cranelift: support scalar types for min/max instructions Open

cranelift cranelift:area:aarch64 cranelift:area:x64

bytecodealliance/wasmtime#3370 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: Debugging JIT dwarf data is missing global variables. Open

bug cranelift wasmtime:debugging

bytecodealliance/wasmtime#3439 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Publicly viewable benchmarks against native? Open

bytecodealliance/wasmtime#3460 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: state which crates are public and semver-compatible Open

cranelift cranelift:documentation

bytecodealliance/wasmtime#3471 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Crash when Wasmtime invokes nondefault AssemblyScript function Open

bytecodealliance/wasmtime#3474 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: use `shld`/`shrd` in 128-bit shift lowerings Open

cranelift cranelift:area:x64 enhancement

bytecodealliance/wasmtime#3477 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
cargo workspaces break `wiggle::from_witx` path resolution Open

bytecodealliance/wasmtime#3519 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: Emit constructor function names as `foo` instead of `constructor_foo` Open

enhancement isle

bytecodealliance/wasmtime#3527 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: Syntax sugar for when external constructors and extractors use the same name in Rust and ISLE Open

enhancement isle

bytecodealliance/wasmtime#3528 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: prefix mach inst constructors with their ISA Open

isle

bytecodealliance/wasmtime#3529 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: consider using `let x = if let Some(x) = foo() { x } else { return None; }` instead of `let x = foo()?;` in emitted code Open

isle

bytecodealliance/wasmtime#3530 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: allow declaring internal constructors as infallible Open

enhancement isle

bytecodealliance/wasmtime#3546 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Shrink the size of a compiled artifact's .wasmtime.addrmap section Open

bytecodealliance/wasmtime#3547 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: support `&'static str`s Open

enhancement isle

bytecodealliance/wasmtime#3548 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Remove old issues and improve labeling Open

bytecodealliance/wasmtime#3567 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
ISLE: support bool types and constants properly Open

enhancement isle

bytecodealliance/wasmtime#3573 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: fuzz generated code with on-the-fly `Arbitrary` extractor results Open

enhancement isle

bytecodealliance/wasmtime#3574 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: explicitly define rule-ordering heuristic Open

enhancement isle

bytecodealliance/wasmtime#3575 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: emit_small_memory_copy ignores alignment Open

bug cranelift

bytecodealliance/wasmtime#3583 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
cranelift: let JIT targets be external crates Open

cranelift enhancement

bytecodealliance/wasmtime#3593 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
exports for wasi_snapshot_preview1::fd_write in memory64 has 32 bit pointers Open

wasm-proposal:memory64

bytecodealliance/wasmtime#3594 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
wasmtime-cache: file-per-thread-logger should be an optional dependency Open

bytecodealliance/wasmtime#3599 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
clock() function in ctime always return 0 Open

bug

bytecodealliance/wasmtime#3605 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: incremental jit compilation Open

cranelift enhancement

bytecodealliance/wasmtime#3624 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: Big endian flag on memory operations ignored by x86 and aarch64 backends Open

bug cranelift

bytecodealliance/wasmtime#3625 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: use spillslots only as large as actual values, not registers Open

cranelift cranelift:area:regalloc enhancement

bytecodealliance/wasmtime#3647 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: timing module for `cranelift-codegen` uses too much TLS space Open

bug cranelift

bytecodealliance/wasmtime#3654 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Display expected/actual type signature in "indirect call type mismatch" error? Open

bytecodealliance/wasmtime#3705 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Cranelift: Sign/zero-extend docs do not match implementation Open

bug cranelift

bytecodealliance/wasmtime#3722 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: support primitive type definitions without naming the primitive type twice Open

enhancement isle

bytecodealliance/wasmtime#3728 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: ISLE extraction panics Open

bug cranelift isle

bytecodealliance/wasmtime#3743 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: allow for locally-ordered precedence of rules Open

enhancement isle

bytecodealliance/wasmtime#3751 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Pooling allocator: investigate combining separate mmaps into one (unified per-instance) slot Open

wasmtime

bytecodealliance/wasmtime#3754 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Unwind info for Windows may not be correct for entire function prologue Open

bug cranelift

bytecodealliance/wasmtime#3859 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Shrink the total size of all fuzzers when built Open

fuzzing

bytecodealliance/wasmtime#3875 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: split out a "settings" / flags infrastructure that works without the compiler proper Open

cranelift enhancement

bytecodealliance/wasmtime#3900 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
wasi-common: unclear license of witx files in WASI submodule Open

bytecodealliance/wasmtime#3912 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Expose `wasmtime_runtime::InstantiationError` as a stable wasmtime API Open

wasmtime wasmtime:api

bytecodealliance/wasmtime#3928 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Take N mutations from `wasm-mutate` instead of only the first Open

fuzzing

bytecodealliance/wasmtime#3933 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
wasi-nn: handle any kind of tensor layout Open

bytecodealliance/wasmtime#3961 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
When to remove support for disabling a feature? Open

bytecodealliance/wasmtime#3969 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Migrating workloads - snapshot and restore somewhere else Open

bytecodealliance/wasmtime#4002 · 2 comments · 6 reactions · 0 assignees · Indexed Sep 14, 2026
Wasmtime running .net web application console prints incorrect port information Open

bytecodealliance/wasmtime#4004 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
x64: use `mov` instead of `movzx` for small loads Open

cranelift cranelift:area:x64

bytecodealliance/wasmtime#4006 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Ability to retrieve name of invoked hostcall in call hook Open

bytecodealliance/wasmtime#4018 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
wasmtime-jit-debug crate is missing the LICENSE file Open

bytecodealliance/wasmtime#4023 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Cranelift: build better abstractions around "pooled-sequences Vec and range-list Vec" data structure Open

cranelift enhancement

bytecodealliance/wasmtime#4028 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
__multi3 optimization Open

cranelift enhancement

bytecodealliance/wasmtime#4077 · 19 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ISLE: add flag for whether to expand internal constructors Open

cranelift enhancement isle

bytecodealliance/wasmtime#4089 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Slacked fuel metering Open

wasmtime:fuel

bytecodealliance/wasmtime#4109 · 36 comments · 3 reactions · 0 assignees · Indexed Sep 14, 2026

bytecodealliance/wasmtime

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