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Make bazel_cc_code_coverage_test more robust against GCC version diff…
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…erences (bazelbuild#16254)

* -fprofile-dir shouldn't be used because on the g++ command line because it
has different behaviour with different versions (w.r.t. where the output
gcda file ends up).
* The gcda and gcno files may end up in the same directory as the object file
or in the current working directory.
* The output of the gcov call in collect_cc_coverage may be
"*.gcda.gcov.json.gz" or "*.gcov.json.gz" (as well as the original text file
for much older GCC versions).

Also re-enable the test for Ubuntu 20.04 pre and postsubmits.

Fixes bazelbuild#16229

Closes bazelbuild#16235.

PiperOrigin-RevId: 473218955
Change-Id: I1f4887f251da8f56f8ea525c1a1410e6257bf31b

Co-authored-by: Charles Mita <cmita@google.com>
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meteorcloudy and c-mita authored Sep 12, 2022
1 parent 6a2b1ae commit 2ca1ab2
Showing 1 changed file with 44 additions and 25 deletions.
69 changes: 44 additions & 25 deletions src/test/shell/bazel/bazel_cc_code_coverage_test.sh
Original file line number Diff line number Diff line change
Expand Up @@ -107,24 +107,44 @@ int main(void) {
EOF

generate_and_execute_instrumented_binary coverage_srcs/test \
"$COVERAGE_DIR_VAR/coverage_srcs" \
coverage_srcs/a.h coverage_srcs/a.cc \
coverage_srcs/b.h \
coverage_srcs/t.cc

# g++ generates the notes files in the current directory. The documentation
# (https://gcc.gnu.org/onlinedocs/gcc/Gcov-Data-Files.html#Gcov-Data-Files)
# says they are placed in the same directory as the object file, but they
# are not. Therefore we move them in the same directory.
agcno=$(ls *a.gcno)
tgcno=$(ls *t.gcno)
mv $agcno coverage_srcs/$agcno
mv $tgcno coverage_srcs/$tgcno
# Prior to version 11, g++ generates the notes files in the current directory
# instead of next to the object file despite the documentation indicating otherwise:
# https://gcc.gnu.org/onlinedocs/gcc/Gcov-Data-Files.html#Gcov-Data-Files
# This is fixed in g++ 11 so we have to handle both cases.

local not_found=0
ls coverage_srcs/*a.gcno > /dev/null 2>&1 || not_found=$?
if [[ $not_found -ne 0 ]]; then
agcno=$(ls *a.gcno)
tgcno=$(ls *t.gcno)
agcda=$(ls *a.gcda)
tgcda=$(ls *t.gcda)
mv $agcno coverage_srcs/$agcno
mv $tgcno coverage_srcs/$tgcno
mv $agcda coverage_srcs/$agcda
mv $tgcda coverage_srcs/$tgcda
fi
agcno=$(ls coverage_srcs/*a.gcno)
tgcno=$(ls coverage_srcs/*t.gcno)
agcda=$(ls coverage_srcs/*a.gcda)
tgcda=$(ls coverage_srcs/*t.gcda)
# Even though gcov expects the gcda files to be next to the gcno files,
# during Bazel execution this will not be the case. collect_cc_coverage.sh
# expects them to be in the COVERAGE_DIR and will move the gcno files itself.
# We cannot use -fprofile-dir during compilation because this causes the
# filenames to undergo mangling; see
# https://github.com/bazelbuild/bazel/issues/16229
mv $agcda "$COVERAGE_DIR_VAR/$agcda"
mv $tgcda "$COVERAGE_DIR_VAR/$tgcda"

# All generated .gcno files need to be in the manifest otherwise
# the coverage report will be incomplete.
echo "coverage_srcs/$tgcno" >> "$COVERAGE_MANIFEST_VAR"
echo "coverage_srcs/$agcno" >> "$COVERAGE_MANIFEST_VAR"
echo "$tgcno" >> "$COVERAGE_MANIFEST_VAR"
echo "$agcno" >> "$COVERAGE_MANIFEST_VAR"
}

# Generates and executes an instrumented binary:
Expand All @@ -138,17 +158,7 @@ EOF
# - path_to_binary destination of the binary produced by g++
function generate_and_execute_instrumented_binary() {
local path_to_binary="${1}"; shift
local gcda_directory="${1}"; shift
# -fprofile-arcs Instruments $path_to_binary. During execution the binary
# records code coverage information.
# -ftest-coverage Produces a notes (.gcno) file that coverage utilities
# (e.g. gcov, lcov) can use to show a coverage report.
# -fprofile-dir Sets the directory where the profile data (gcda) appears.
#
# The profile data files need to be at a specific location where the C++
# coverage scripts expects them to be ($COVERAGE_DIR/path/to/sources/).
g++ -fprofile-arcs -ftest-coverage \
-fprofile-dir="$gcda_directory" \
g++ -coverage \
"$@" -o "$path_to_binary" \
|| fail "Couldn't produce the instrumented binary for $@ \
with path_to_binary $path_to_binary"
Expand Down Expand Up @@ -274,6 +284,7 @@ EOF


function test_cc_test_coverage_gcov() {
local -r gcov_location=$(which gcov)
"$gcov_location" -version | grep "LLVM" && \
echo "gcov LLVM version not supported. Skipping test." && return
# gcov -v | grep "gcov" outputs a line that looks like this:
Expand Down Expand Up @@ -316,8 +327,16 @@ function test_cc_test_coverage_gcov() {
fail "Number of lines in C++ gcov coverage output file is "\
"$nr_lines and different than 17"
else
agcda=$(ls $COVERAGE_DIR_VAR/*a.gcda.gcov.json.gz)
tgcda=$(ls $COVERAGE_DIR_VAR/*t.gcda.gcov.json.gz)
# There may or may not be "gcda" in the extension.
local not_found=0
ls $COVERAGE_DIR_VAR/*.gcda.gcov.json.gz > /dev/null 2>&1 || not_found=$?
if [[ $not_found -ne 0 ]]; then
agcda=$(ls $COVERAGE_DIR_VAR/*a.gcov.json.gz)
tgcda=$(ls $COVERAGE_DIR_VAR/*t.gcov.json.gz)
else
agcda=$(ls $COVERAGE_DIR_VAR/*a.gcda.gcov.json.gz)
tgcda=$(ls $COVERAGE_DIR_VAR/*t.gcda.gcov.json.gz)
fi
output_file_json="output_file.json"
zcat $agcda $tgcda > $output_file_json

Expand All @@ -332,4 +351,4 @@ function test_cc_test_coverage_gcov() {
fi
}

run_suite "Testing tools/test/collect_cc_coverage.sh"
run_suite "Testing tools/test/collect_cc_coverage.sh"

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