mirror of
https://github.com/fluencelabs/wasm-utils
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40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
# wasm-utils
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Collection of WASM utilities used in Parity and WASM contract devepment
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## Build tools for cargo
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Easiest way to use is to install via `cargo install`:
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```
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cargo install --git https://github.com/paritytech/wasm-utils wasm-build
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```
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## Symbols optimizer (wasm-opt)
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```
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cargo run --release --bin wasm-opt -- <input_binary.wasm> <output_binary.wasm>
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```
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This will optimize WASM symbols tree to leave only those elements that are used by contract `_call` function entry.
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## Gas counter (wasm-gas)
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For development puposes, raw WASM contract can be injected with gas counters (the same way as it done by Parity runtime when running contracts)
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```
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cargo run --release --bin wasm-gas -- <input_binary.wasm> <output_binary.wasm>
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```
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## Allocators substiution (wasm-ext)
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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.
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```
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cargo run --release --bin wasm-ext -- <input_binary.wasm> <output_binary.wasm>
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```
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## API
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All executables use corresponding api methods of the root crate and can be combined in other build tools.
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