# 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