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README.md

wasm-split

This tool takes a WebAssembly file and postprocesses it so it can be used with symbolicator. It does the following operations:

  • It embeds a build_id custom section if such a section was not embedded yet.
  • It optionally removes debug sections from a WASM file.
  • It can optionally create a secondary WASM container with debug sections.

Compiling

wasm-split is not distributed precompiled so you need to compile it yourself:

cargo build --release

Examples

Add a missing build-id and modify the file in place:

$ wasm-split input.wasm

Add a missing build-id, strip debug sections from a wasm file and write to new file:

$ wasm-split input.wasm -o output.wasm --strip

Add a missing build-id, strip debug sections from a wasm file and save in separate debug file:

$ wasm-split input.wasm -o output.wasm --strip --debug-out=output.debug

In both cases a build_id will be added if missing and in all cases the build ID is written to stdout in hexadecimal format.

References

The build_id section is a proposed extension to WASM build tools: tool-conventions#133.