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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2023 Oracle. All Rights Reserved.
#
# Routines for capturing kernel code coverage reports
GCOV_DIR=/sys/kernel/debug/gcov
# Find the topmost directories of the .gcno directory hierarchy
__gcov_find_topdirs() {
find "${GCOV_DIR}/" -name '*.gcno' -printf '%d|%h\n' | \
sort -g -k 1 | \
uniq | \
$AWK_PROG -F '|' 'BEGIN { x = -1 } { if (x < 0) x = $1; if ($1 == x) printf("%s\n", $2);}'
}
# Generate lcov html report from kernel gcov data if configured
_gcov_generate_report() {
local output_dir="$1"
test -n "${output_dir}" || return
# Kernel support built in?
test -d "$GCOV_DIR" || return
readarray -t gcno_dirs < <(__gcov_find_topdirs)
test "${#gcno_dirs[@]}" -gt 0 || return
mkdir -p "${output_dir}/raw/"
# Collect raw coverage data from the kernel
readarray -t source_dirs < <(find "${GCOV_DIR}/" -mindepth 1 -maxdepth 1 -type d)
for dir in "${source_dirs[@]}"; do
cp -p -R -d -u "${dir}" "${output_dir}/raw/"
done
# If lcov is installed, use it to summarize the gcda data.
# If it is not installed, there's no point in going forward
command -v lcov > /dev/null || return
local lcov=(lcov --exclude 'include*' --capture)
lcov+=(--output-file "${output_dir}/gcov.report")
for d in "${gcno_dirs[@]}"; do
lcov+=(--directory "${d}")
done
# Generate a detailed HTML report from the summary
local gcov_start_time="$(date --date="${fstests_start_time:-now}")"
local genhtml=()
if command -v genhtml > /dev/null; then
genhtml+=(genhtml -o "${output_dir}/" "${output_dir}/gcov.report")
genhtml+=(--title "fstests on $(hostname -s) @ ${gcov_start_time}" --legend)
fi
# Try to convert the HTML report summary as text for easier grepping if
# there's an HTML renderer present
local totext=()
test "${#totext[@]}" -eq 0 && \
command -v lynx &>/dev/null && \
totext=(lynx -dump "${output_dir}/index.html" -width 120 -nonumbers -nolist)
test "${#totext[@]}" -eq 0 && \
command -v links &>/dev/null && \
totext=(links -dump "${output_dir}/index.html" -width 120)
test "${#totext[@]}" -eq 0 && \
command -v elinks &>/dev/null && \
totext=(elinks -dump "${output_dir}/index.html" --dump-width 120 --no-numbering --no-references)
# Analyze kernel data
"${lcov[@]}" > "${output_dir}/gcov.stdout" 2> "${output_dir}/gcov.stderr"
test "${#genhtml[@]}" -ne 0 && \
"${genhtml[@]}" >> "${output_dir}/gcov.stdout" 2>> "${output_dir}/gcov.stderr"
test "${#totext[@]}" -ne 0 && \
"${totext[@]}" > "${output_dir}/index.txt" 2>> "${output_dir}/gcov.stderr"
}
# Reset gcov usage data
_gcov_reset() {
echo 1 > "${GCOV_DIR}/reset"
}
# If the caller wanted us to capture gcov reports but the kernel doesn't
# support it, turn it off.
_gcov_check_report_gcov() {
test -z "$REPORT_GCOV" && return 0
test -w "${GCOV_DIR}/reset" && return 0
unset REPORT_GCOV
return 1
}
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