Tracking Issue for wasm exception-handling architecture intrinsics

[coolreader18]

Feature gate: #![feature(wasm_exception_handling_intrinsics)]

This is a tracking issue for wasm exception-handling architecture intrinsics; currently, only the throw instruction is implemented as a platform intrinsic.

Public API

// core::arch::wasm32

pub unsafe fn throw<const TAG: i32>(ptr: *mut u8) -> !;

Steps / History

• Implementation: [wasm32] Add an intrinsic for the throw instruction stdarch#1542
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• Needs better support from LLVM before merging. At the moment, LLVM only accepts a tag value of 0, signifying a C++ exception. Ideally one would be able to somehow declare a tag in a similar way to a static, and pass that as the TAG to the intrinsic.

Footnotes

1. https://std-dev-guide.rust-lang.org/feature-lifecycle/stabilization.html ↩