Collection of WASM utilities used in Parity and WASM contract devepment
Easiest way to use is to install via cargo install:
cargo install --git https://github.com/paritytech/wasm-utils wasm-build
cargo run --release --bin wasm-prune -- <input_binary.wasm> <output_binary.wasm>
This will optimize WASM symbols tree to leave only those elements that are used by contract _call function entry.
For development puposes, raw WASM contract can be injected with gas counters (the same way as it done by Parity runtime when running contracts)
cargo run --release --bin wasm-gas -- <input_binary.wasm> <output_binary.wasm>
Parity WASM runtime provides simple memory allocators, if contract requires. When relied on this allocators, WASM binary size can be greatly reduced. This utility scans for _malloc, _free invokes inside the WASM binary and substitutes them with invokes of the imported _malloc, _free. Should be run before wasm-opt for better results.
cargo run --release --bin wasm-ext -- <input_binary.wasm> <output_binary.wasm>
All executables use corresponding api methods of the root crate and can be combined in other build tools.