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< h1 class = "menu-title" > revive compiler book< / h1 >
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< main >
< h1 id = "code-coverage" > < a class = "header" href = "#code-coverage" > Code coverage< / a > < / h1 >
< p > Revive measures Rust and LLVM C++ line and region coverage with < a href = "https://github.com/taiki-e/cargo-llvm-cov" > < code > cargo-llvm-cov< / code > < / a > over the same tests as < code > make test-workspace< / code > .< / p >
< p > Two ways to obtain a report:< / p >
< ol >
< li > < strong > Locally:< / strong > < code > make coverage< / code > and < code > make coverage-llvm-report< / code > (described below).< / li >
< li > < strong > Per PR:< / strong > apply the < code > measure code coverage< / code > label and read the bot-generated PR comment once the triggered workflow completes.< / li >
< / ol >
< h2 id = "running-locally" > < a class = "header" href = "#running-locally" > Running locally< / a > < / h2 >
< pre > < code class = "language-bash" > # Install LLVM.
make install-llvm
# Or install instrumented LLVM.
make install-llvm-coverage
# ..set LLVM_SYS_221_PREFIX to a compatible LLVM build..
# Run coverage and generate revive Rust report.
make coverage
# Generate a separate LLVM C++ report if needed, if
# instrumented LLVM was used for `make coverage`.
make coverage-llvm-report
# Print clickable links to all accumulated HTML reports detected
# (they're grouped by timestamps) to easily view them in the browser.
make coverage-browse
< / code > < / pre >
< p > The target:< / p >
< ol >
< li > Builds and tests the workspace under cargo-llvm-cov with < code > --ignore-run-fail< / code > so partial coverage lands even when test binaries exit non-zero.< / li >
< li > Writes a browsable HTML report into a timestamped run directory (< code > coverage-reports/< stamp> /revive/< / code > or < code > coverage-reports/< stamp> /llvm/< / code > ).< / li >
< / ol >
< h2 id = "resource-requirements-and-troubleshooting" > < a class = "header" href = "#resource-requirements-and-troubleshooting" > Resource requirements and troubleshooting< / a > < / h2 >
< p > < code > make coverage< / code > bakes in two defaults that keep instrumented runs tractable:< / p >
< ul >
< li > It drops DWARF with < code > CARGO_PROFILE_DEV_DEBUG=0< / code > since coverage line data lives in the binaries’ < code > __llvm_covmap< / code > sections.< / li >
< li > It bounds profile output with < code > LLVM_PROFILE_FILE_NAME=revive-%4m.profraw< / code > . The default pattern contains < code > %p< / code > , writing one raw profile per process. With an instrumented LLVM this could exceed tens of gigabytes of raw profiles in a full run. The < code > %4m< / code > merge pool makes processes merge their counters into a handful of files instead.< / li >
< / ul >
< p > Even with those defaults, plan for:< / p >
< ul >
< li > Disk space:
< ul >
< li > Building instrumented LLVM and running an instrumented < code > make coverage< / code > still needs tens of gigabytes of disk space.< / li >
< / ul >
< / li >
< li > LLVM link memory (< code > make install-llvm-coverage< / code > ):
< ul >
< li > If a link step gets OOM-killed, rerun with capped parallelism (e.g. < code > JOBS=1< / code > ) to serialize the links. The rerun resumes incrementally.< / li >
< / ul >
< / li >
< li > Test-binary link memory (< code > make coverage< / code > ):
< ul >
< li > If a link gets OOM-killed, rerun with < code > RUSTFLAGS="-C link-arg=-fuse-ld=lld"< / code > (or < em > additionally< / em > with capped parallelism, e.g. < code > CARGO_BUILD_JOBS=1< / code > ). GNU ld holds every input object and the coverage mapping of the entire dependency closure in memory at once. lld links with a smaller peak.< / li >
< / ul >
< / li >
< li > Test-run memory (< code > make coverage< / code > ):
< ul >
< li > Each concurrently running test spawns an instrumented resolc. On memory-constrained machines cap it with < code > RUST_TEST_THREADS=4< / code > . This throttles test execution only, not compilation.< / li >
< / ul >
< / li >
< / ul >
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