10 releases
0.2.2 | Aug 13, 2024 |
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0.2.1 | Aug 8, 2024 |
0.2.0 | Jun 26, 2024 |
0.1.0 | Dec 3, 2023 |
0.0.2 | Nov 11, 2023 |
#119 in #profiling
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Contains (ELF exe/lib, 81KB) tests/output/fibonacci, (ELF exe/lib, 81KB) tests/output/fibonacci-cov, (ELF exe/lib, 2KB) tests/output/fibonacci-expected.ll.o
Wasmcov
Wasmcov comprises a Rust library and an associated binary that offer a range of utilities for coverage analysis of WebAssembly (Wasm) modules. This tool empowers you to gather and scrutinize code coverage data while executing Wasm modules. Wasmcov stands out for its adaptability and seamless integration into your Wasm projects, serving as a potent instrument to elevate the standard of your Wasm applications.
If you would like to apply this method to non-Rust WASM binaries, see our General guide.
Installation
Install the cargo-wasmcov
command by running:
cargo install wasmcov
Usage
cargo-wasmcov
provides several subcommands to build, run, test, and generate coverage reports for your WASM projects.
Integrating Coverage Capture
Before using cargo-wasmcov
, you need to integrate the coverage capture function into your WebAssembly project:
-
Add
wasmcov
as a dependency in yourCargo.toml
:wasmcov = "0.2"
-
Add the following function to your WebAssembly project:
#[cfg(target_family = "wasm")] #[no_mangle] pub unsafe extern "C" fn capture_coverage() { const BINARY_NAME: &str = env!("CARGO_PKG_NAME"); let mut coverage = vec![]; wasmcov::minicov::capture_coverage(&mut coverage).unwrap(); // Invoke a function to preserve the coverage data or use `println!` for debugging. }
For NEAR Protocol projects, use this macro in
lib.rs
of your smart contract:#[cfg(target_family = "wasm")] wasmcov::near::add_coverage!();
Build
Build your project with WASM coverage instrumentation:
cargo wasmcov build [-- <additional cargo arguments>]
Example:
cargo wasmcov build -- --all --target wasm32-unknown-unknown --release
Run
Run your project with WASM coverage:
cargo wasmcov run [--near <VERSION>] [-- <additional cargo arguments>]
The --near
option allows you to specify a NEAR sandbox version (e.g., 1.35.0) if needed. It is required for near projects.
Test
Run tests with WASM coverage:
cargo wasmcov test [--near <VERSION>] [-- <additional cargo arguments>]
The --near
option allows you to specify a NEAR sandbox version (e.g., 1.35.0) if needed. It is required for near projects.
Generate Coverage Report
Generate a coverage report:
cargo wasmcov report [-- <additional llvm-cov arguments>]
This command will process all collected coverage data and generate reports for each target.
Clean
Clean coverage data:
cargo wasmcov clean [--all]
Use the --all
flag to remove the entire wasmcov directory content.
Notes
- The tool uses the nightly Rust toolchain for building and running.
- Coverage reports are generated using LLVM coverage tools.
- For NEAR-specific projects, you must specify the NEAR sandbox version using the
--near
option with therun
andtest
subcommands.
License
This repository is distributed under the terms of the Apache License (Version 2.0). Refer to LICENSE for details.
When using the Wasmcov workaround (llvm-ir to .o file for linking) on its own, an attribution is required.
Maintainer
This repository is currently managed by Bartosz Barwikowski from Hacken. It was originally created by Noah Jelich, while the method itself was co-created with Bartosz. Please don't hesitate to reach out for any queries or concerns.
Contributing
Contributions are encouraged! Employ the cargo build
command to build the project. Note: during testing, deactivate parallelism by using the --test-threads=1
flag. This ensures environment variables remain unaffected by other tests.
For convenience, utilize the shorthands make build
and make test
for building and testing the project, respectively.
Dependencies
~0–1.7MB
~22K SLoC