Bullseye Code Coverage Instant

The instrumented source is then compiled and linked with Bullseye’s runtime library. You run your test suite normally (unit tests, integration tests, fuzzing). As the binary executes, the probes increment counters in shared memory or a .cov data file. Bullseye is remarkably low-overhead—typically 10-30% slowdown, making it viable for large test suites. Phase 3: Merging & Reporting ( covselect , covbr , covhtml ) This is where Bullseye shines. You can run tests across 1000 different processes, on different machines, at different times, and then merge all the .cov files into a single aggregate report. The command covmerge intelligently sums counters without double-counting. 3. Deep Dive: Decision Coverage (The "True" Bullseye Metric) Many teams erroneously believe 100% line coverage equals "tested." Consider this C++ function:

bool validate_user(int age, bool has_license, bool is_insured) if (age >= 18 && (has_license of 100% would be achieved if a single test calls validate_user(25, true, false) . All lines execute. But have you tested all logical possibilities? bullseye code coverage

Developed by Bullseye Testing Technology, Bullseye Coverage is a proprietary code coverage tool designed for C, C++, and C# environments. Unlike many modern, IDE-integrated plugins, Bullseye has carved a niche for itself in highly regulated industries (automotive, medical devices, aerospace) where functional safety and certification (ISO 26262, DO-178C, IEC 61508) are non-negotiable. The instrumented source is then compiled and linked

// After Bullseye instrumentation (conceptual) probe_1 = 0; // Counter for the decision if (temperature > 100 && pressure < 50) probe_1++; // Counts entry of the true branch activate_alarm(); open-source | Bullseye has decision coverage

set(CMAKE_C_COMPILER "covc" CACHE STRING "") set(CMAKE_CXX_COMPILER "covc" CACHE STRING "") set(CMAKE_CXX_COMPILER_LAUNCHER "" CACHE STRING "") set(CMAKE_C_COMPILER_ARG1 "--compiler" CACHE STRING "") set(CMAKE_CXX_COMPILER_ARG1 "--compiler" CACHE STRING "") export PATH=/usr/local/bullseye/bin:$PATH covselect --add --on # Turn on coverage measurement cmake -DCMAKE_TOOLCHAIN_FILE=bullseye-toolchain.cmake .. covbuild cmake --build . --parallel Step 3: Run Tests & Capture Data cov01 -1 # Reset counters to zero ./bin/my_unit_tests covrun ./bin/integration_tests Step 4: Merge & Report covmerge -a *.cov # Merge all .cov files into one covhtml --title "Sprint 23 Coverage" -o coverage_html coverage.cov Step 5: Set a Quality Gate In your CI script, fail the build if decision coverage drops below 80%: