Tasks and Issues

[clover2123]

Language Standards

WebAssembly Standard

• https://webassembly.github.io/spec/core/

WebAssembly-JavaScript API Standard

• https://webassembly.github.io/spec/js-api/index.html

WASI (WebAssembly System Interface) API

• https://github.com/WebAssembly/WASI

Test Suites

• WebAssembly/spec
  • https://github.com/WebAssembly/spec/tree/main/test
• WebAssembly/testsuite
  • https://github.com/WebAssembly/testsuite
• WebAssembly/testsuite-js (JS API)
  • https://github.com/WebAssembly/testsuite-js

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Current Issues

1. Code Duplication from Memory64 Support

• Excessive class duplication in ByteCode.h
• Increased code size and reduced maintainability
• Solution: introduce base classes and helper macros
• Refactor incrementally

2. Excessive Stack Usage in Debug Mode

• interpret() uses ~8KB stack (vs. a few hundred bytes in release)
• Problematic for recursive call tests
• Cause: too many local variables with no stack slot reuse
• Solution: reuse variables for uint32/uint64 indices and offsets

3. Missing WASI Preview1 Functions

• Many WASI Preview1 APIs are not implemented
• Low complexity (mainly interface additions)
• Can be implemented quickly

4. Apple Clang Optimization Breaking Bytecode Mapping

• Compiler merges interpreter loop paths
• Breaks computed goto → bytecode mapping
• Critical issue for JIT compilation
• Current workaround: swap src/dst operands in some bytecodes
• Required actions:
  • Verify the issue is fully resolved
  • Add release assert to prevent regression

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Optimizations

Interpreter-JIT Hybrid Runtime Execution

• Use interpretation for cold functions and JIT compilation for hot functions

[clover2123]

@zherczeg I've summarized the current tasks and issues for the Walrus project. Could you please review them and feel free to add any other issues you may have noticed? Thank you.

[zherczeg]

Thank you for collecting these tasks. I think this is a good summary. If anything else came to my mind later, I will add them to this issue.