oxidecomputer / oxidecomputer/p4
Variables without initializers cause invalid code generation.
Open
Nobody has claimed this yet.
bug
codegen
- Dominant language
- Rust
- Stars
- 137
- Forks
- 12
- Avg merge
- 4d 22h
- Merged PRs (30d)
- 3
Description
The following works fine.
bit<32> x = 0;
However, the following causes bad code generation
bit<32> x;
According to the P4 spec section 11.2, variable initializers are optional, so this should be accepted by the front end and generate valid code.
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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 two P4 declarations from the issue and compare the generated output. Trace the compiler's front-end handling and code-generation path for variables without initializers; done means the uninitialized declaration is accepted and produces valid code consistent with P4 specification section 11.2.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100