WebAssembly/binaryen

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Optimizer and compiler/toolchain library for WebAssembly

Stars: 8.6k
Forks: 885
Open beginner issues: 0
Indexed issues: 332
Avg merge: 1d 19h
Merged PRs (30d): 69

Dominant language: WebAssembly
License: Apache-2.0
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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332 open issues indexed

wasm-emscripten-finalize does not escape characters Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#3470 · 11 comments · Opened Jan 7, 2021
CSE doesn't work for subexpressions with implicit trap Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#3392 · 4 comments · Opened Nov 20, 2020
Don't print the whole disassembly upon validation error Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#3372 · 4 comments · Opened Nov 16, 2020
Fatal: Module::addExport: empty name when using binaryen.js Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#3313 · 3 comments · Opened Nov 1, 2020
Move wasm2js import/export name mangling into a separate optional pass Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#3281 · Opened Oct 23, 2020
Read-only memory optimizations Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

WebAssembly/binaryen#3263 · 13 comments · 2 reactions · Opened Oct 19, 2020
split_wast does not check for unbalanced parens Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#3231 · 1 reaction · Opened Oct 12, 2020
Unroll constant-sized loops Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#3198 · 4 comments · Opened Oct 7, 2020
Replacing Stack IR with Poppy IR Open

Poppy IR

WebAssembly/binaryen#3059 · 3 reactions · 1 assignee · Opened Aug 18, 2020
Stop building with assertions enabled by default? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#3058 · 5 comments · Opened Aug 18, 2020
Validate by default? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/binaryen#3057 · 8 comments · Opened Aug 18, 2020
rpath setup doesn't take user-specified LIBDIR path into account Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2999 · 7 comments · Opened Jul 28, 2020
test failures on s390x (big-endian) Open

interpreter

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2983 · 26 comments · Opened Jul 24, 2020
redundant second cast to integer after already casted int value in asm.js? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2951 · 1 comment · Opened Jul 10, 2020
Add Asyncify mode that uses "native" stack Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2934 · 10 comments · 6 reactions · Opened Jun 26, 2020
Is it possible avoid c++ exeptions? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2917 · 33 comments · 1 reaction · Opened Jun 18, 2020
Further enhancements to ExpressionRunner Open

interpreter

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2786 · 8 comments · Opened Apr 22, 2020
Dwarf tests fail on windows due to path seperators Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#2781 · 6 comments · Opened Apr 20, 2020
Reduce threading overhead Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2740 · 3 comments · Opened Apr 9, 2020
wasm2js: import { getTempRet0 } from 'env'; Open

good first bug help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2716 · 8 comments · 1 reaction · Opened Mar 30, 2020
wasm-reduce: don't require test file and working file Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/binaryen#2651 · 9 comments · Opened Feb 7, 2020
"skipping debug location info" warning Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#2573 · 4 comments · Opened Jan 6, 2020
emscripten build with cmake fails in wasm-reduce Open

good first bug help wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#2564 · 1 comment · Opened Dec 31, 2019
Supporting up-to-date spec test format Open

good first bug help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2555 · Opened Dec 25, 2019
Improve scheme to generating internal names Open

enhancement good first bug help wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

WebAssembly/binaryen#2504 · 1 reaction · Opened Dec 5, 2019
Integrate ASan with MixedArena Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2491 · Opened Dec 3, 2019
[Feature] Evaluated case elimination pass Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

WebAssembly/binaryen#2468 · 6 comments · Opened Nov 25, 2019
LIFO order optimization? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2458 · 1 comment · Opened Nov 20, 2019
Can BinaryenTypeAuto be deprecated? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2456 · 3 comments · Opened Nov 20, 2019
Memory packing is not safe with imported memory Open

good first bug

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2423 · 1 comment · Opened Nov 6, 2019
shared:ERROR: unexpected error while trying to eval ctors Fatal: ...stopping since could not flatten memory Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#2418 · 10 comments · Opened Nov 3, 2019
Machine-generate instruction implementation code? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2414 · 2 comments · Opened Nov 1, 2019
binaryen.js wasm-opt commandline tool Open

plugins

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2411 · 7 comments · Opened Oct 31, 2019
Support source maps with wasm2js Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

WebAssembly/binaryen#2410 · Opened Oct 31, 2019
Increased scalability of the push_back function Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

WebAssembly/binaryen#2362 · 1 comment · Opened Sep 27, 2019
Asyncify lists use * as a wildcard, but function names can have * Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

WebAssembly/binaryen#2354 · 6 comments · Opened Sep 24, 2019
Provide a way to detect asyncified exports Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/binaryen#2322 · 1 comment · Opened Aug 30, 2019
Allow using Asyncify functions from a shared module Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

WebAssembly/binaryen#2321 · 8 comments · Opened Aug 30, 2019
Wasm vs Wasm2js export naming is incompatible Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2310 · 4 comments · 1 reaction · Opened Aug 27, 2019
[wasm-validate] Error messages for name custom sections are not very concise Open

enhancement help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

WebAssembly/binaryen#2309 · Opened Aug 27, 2019
[wasm-opt] Split functions that break the limit Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2308 · 15 comments · Opened Aug 27, 2019
wasm::is{U,S}Integer64() doesn't work well around INT64_MAX Open

help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

WebAssembly/binaryen#2291 · 1 reaction · Opened Aug 8, 2019
Automate reduction from fuzz_opt.py Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

WebAssembly/binaryen#2230 · 1 comment · Opened Jul 17, 2019
I64ToI32Lowering fails on i64.trunc_sat_f64_s Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

WebAssembly/binaryen#2198 · 1 comment · Opened Jul 2, 2019
Does not compile on GCC versions < 5.0 Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

WebAssembly/binaryen#2150 · 1 comment · Opened May 30, 2019
Inlining with -Os is suboptimal Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2144 · 2 reactions · Opened May 24, 2019
Change default inlining behavior to favor single-caller inlines Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

WebAssembly/binaryen#2139 · Opened May 23, 2019
[Proposal] loop fusion pass Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#2040 · 2 comments · Opened Apr 23, 2019
Dynamic Linking with emscripten. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

WebAssembly/binaryen#1955 · Opened Mar 20, 2019
Future of wasm2js Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

WebAssembly/binaryen#1929 · 33 comments · 3 reactions · Opened Feb 28, 2019

WebAssembly/binaryen

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