wasm-utils

Collection of WASM utilities used in Parity and WASM contract devepment

Symbols optimizer (wasm-opt)

cargo run --release --bin wasm-opt -- <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.

Gas counter (wasm-gas)

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>

Allocators substiution (wasm-ext)

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>

API

All executables use corresponding api methods of the root crate and can be combined in other build tools.