WebAssembly / WebAssembly/binaryen
Invalid unreachable loop in text format
Open
Nobody has claimed this yet.
help wanted
- Dominant language
- WebAssembly
- Stars
- 8.6k
- Forks
- 885
- Avg merge
- 1d 19h
- Merged PRs (30d)
- 69
Description
E.g.
(module
(func $0
(drop
(block $label$1 (result i32)
(loop $label$2
(unreachable)
)
)
)
)
)
The loop is unreachable, but we need to emit an unreachable after the loop too, for the block, wabt says
w.wast:6:7: error: type mismatch in block, expected [i32] but got []
Not sure why this is just a bug in the text format - the binary for it is fine.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the supplied module in the text-format parser and compare its behavior with the valid binary form. Trace handling of the unreachable loop and enclosing result-producing block; done means the text format accepts the example without the reported type-mismatch error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- wasm
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100