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Document the process of generating code coverage

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Update the script to check coverage generation is enabled, and provide a sensible error message if it is not.

Change-Id: I42f2b97d18bb3be2d081200cb682ea310476943f
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/70520
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
Reviewed-by: David Neto <dneto@google.com>
This commit is contained in:
Ben Clayton
2021-11-23 17:57:37 +00:00
committed by Tint LUCI CQ
parent e85efca13f
commit 5af571bcbc
2 changed files with 39 additions and 2 deletions
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17
tools/tint-generate-coverage
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@@ -44,9 +44,22 @@ PROFDATA_FILE="${ROOT_DIR}/tint.profdata"
LCOV_FILE="${ROOT_DIR}/lcov.info"
SUMMARY_FILE="${ROOT_DIR}/coverage.summary"
# Remove any existing coverage data and intermediate files
if [ -f "$PROFRAW_FILE" ]; then rm ${PROFRAW_FILE}; fi
if [ -f "$PROFDATA_FILE" ]; then rm ${PROFDATA_FILE}; fi
if [ -f "$LCOV_FILE" ]; then rm ${LCOV_FILE}; fi
if [ -f "$SUMMARY_FILE" ]; then rm ${SUMMARY_FILE}; fi
# Run the executable to generate the raw coverage data
# https://clang.llvm.org/docs/SourceBasedCodeCoverage.html#running-the-instrumented-program
LLVM_PROFILE_FILE="${PROFRAW_FILE}" $@
LLVM_PROFILE_FILE="${PROFRAW_FILE}" "$@"
# Check that coverage information was generated
if [ ! -f "$PROFRAW_FILE" ]; then
echo "lcov.info was not generated. Is coverage generation enabled?"
echo "To enable, run cmake with -DTINT_EMIT_COVERAGE=1".
exit 1
fi
# Fail on any error after running the target executable
set -e
@@ -62,5 +75,5 @@ llvm-cov export --instr-profile="${PROFDATA_FILE}" --format=lcov --object=${TARG
# Generate summary report
llvm-cov report --ignore-filename-regex="(.*_test\.cc|third_party/.*)" --instr-profile="${PROFDATA_FILE}" --object=${TARGET_EXE} > "${SUMMARY_FILE}"
# Clean up
# Clean up intermediate files
rm ${PROFRAW_FILE} ${PROFDATA_FILE}