https://github.com/xtuc/wasm-edit

Edit and instrument already compiled Wasm binaries
https://github.com/xtuc/wasm-edit

Last synced: over 1 year ago
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Edit and instrument already compiled Wasm binaries

• Host: GitHub
• URL: https://github.com/xtuc/wasm-edit
• Owner: xtuc
• Created: 2022-10-20T13:45:07.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2023-05-27T17:05:24.000Z (about 3 years ago)
• Last Synced: 2025-05-07T15:09:10.257Z (over 1 year ago)
• Language: Rust
• Homepage: https://crates.io/crates/wasm-edit
• Size: 56.6 KB
• Stars: 10
• Watchers: 4
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# wasm-edit

> Edit and instrument already compiled Wasm binaries

## Coredump generation

Moved to https://github.com/xtuc/wasm-coredump.

## Install

```

cargo install wasm-edit

```

## Edit the main memory

Change the initial memory amount (in pages):

```

wasm-edit edit-memory --initial-memory=1000 < input.wasm > output.wasm

```

## Trace calls to `memory.grow`

Trace calls to the `memory.grow` instruction:

```

wasm-edit instrument-memory < input.wasm > output.wasm

```

Requires Wasi, but doesn't require any change on the host.

Tested with Rust and theoretically working with C/C++ (clang).

## Running into stack overflow

Some Wasm binaries have very recursive flow of control, increase the maximum stack size:

```

$ ulimit -s 160000

```

[wasmgdb]: https://github.com/xtuc/wasmgdb