# WASMonkey
The WASMonkey patches a WASM object file to replace a set of exported
functions with imported functions from another library.
## Usage
```text
USAGE:
wasmonkey [FLAGS] [OPTIONS] --input <input_file> --output <output_file>
FLAGS:
-n, --original-names Use the original name as a key in the builtins map
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-B, --builtins-additional <builtins_additional>... Additional builtins function names to replace
-b, --builtins <builtins_file> Path to the builtins library
-m, --builtins-map <builtins_map_file> Path to the builtins map file
-i, --input <input_file> Path to the input file
-o, --output <output_file> Path to the output file
```
`builtins_file` is an object containing alternative implementations to
functions called in the wasm code.
Symbols starting with a `builtin_` prefix will be used for substitution.
For example, a `memmove()` function defined as an external in the WASM
object will be replaced by calls to an imported `builtin_memmove()`
function, if `builtin_memmove()` is present in the builtins file.
A JSON-encoded map of the performed substitutions can be optionally written
into `builtins_map_file`.