How to generate native coverage on Android with soong build system.

native_coverage.sh

#!/usr/bin/env bash

###### Module specific parameters starts ######

MODULE_PATH='hardware/interfaces/automotive/vehicle/2.0/default/'
MODULE_INSTALL_PATH='data/nativetest64/vehicle-tests'
INSTRUMENTED_BINARY_NAME='vehicle-tests'
REMOTE_COVERAGE_OUTPUT_DIR='/data/local/tmp/nativetest64/'
SOONG_INTERMEDIATES="out/soong/.intermediates"
GCNO_DIR="$SOONG_INTERMEDIATES/$MODULE_PATH"

###### Module specific parameters ends ########

if [ -z $ANDROID_BUILD_TOP ]; then
  echo "You need to source and lunch before you can use this script"
  exit 1
fi

source $ANDROID_BUILD_TOP/build/envsetup.sh

## check if gcc-4.6 is installed
if ! [ -x "$(command -v gcc-4.6)" ]; then
  echo "gcc-4.6 not found. sudo apt-get install gcc-4.6 to use this script"
  exit 1
fi

## check if lcov-1.12 is installed
if ! [ -x "$(command -v lcov)" ]; then
  echo "lcov not found. sudo apt-get install lcov to use this script"
  exit 1
fi

## Clean previous gcno files from out dir
find "$ANDROID_BUILD_TOP/$GCNO_DIR" -iname "*.gcno" -exec rm -rf "{}" \;

OUTPUT_DIR="$OUT/coverage/$MODULE_INSTALL_PATH"

## Clean previous report if any
rm -rf $OUTPUT_DIR

REPORT_TYPE=${1:-HTML}

echo "Running native tests and generating coverage report"
echo "Output dir: $OUT/coverage/$MODULE_INSTALL_PATH/ "
echo "Report type: $REPORT_TYPE"

set -e # fail early

(cd "$ANDROID_BUILD_TOP/$MODULE_PATH" && ALLOW_MISSING_DEPENDENCIES=true NATIVE_COVERAGE=true mma -j32)

set -x # print commands

adb root
adb wait-for-device

adb shell mkdir -p $REMOTE_COVERAGE_OUTPUT_DIR

#clean old gcda files from device
adb shell find $REMOTE_COVERAGE_OUTPUT_DIR -iname "*.gcda" -exec rm -rf "{}" "\;"

adb push $OUT/$MODULE_INSTALL_PATH/$INSTRUMENTED_BINARY_NAME /data/nativetest64/

## Make this module binary exectuable
adb shell chmod +x /data/nativetest64/$INSTRUMENTED_BINARY_NAME

adb shell \
 GCOV_PREFIX=$REMOTE_COVERAGE_OUTPUT_DIR \
 GCOV_PREFIX_STRIP=`echo $ANDROID_BUILD_TOP | grep -o / | wc -l` \
 /data/nativetest64/$INSTRUMENTED_BINARY_NAME

OUT_COVERAGE=$OUT/coverage

## Pull coverage data from device
adb pull $REMOTE_COVERAGE_OUTPUT_DIR $OUT_COVERAGE/$MODULE_INSTALL_PATH/

cd "$OUT_COVERAGE/$MODULE_INSTALL_PATH"

## Move gcda files from out/soong/.intermediates to current dir
find . -iname "*.gcda" -exec mv "{}" . \;

## Extract gcno from gcnodir archive
ar x $INSTRUMENTED_BINARY_NAME.gcnodir

## Read gcda files with llvm-cov
llvm-cov gcov -f -b *.gcda

## Collect the code coverage results
lcov --directory . --base-directory . --gcov-tool /usr/bin/gcov-4.6 --capture -o cov.info

## Generate HTML files
genhtml cov.info -o report

#cleaning all intermediates coverage files
rm -rf *.gcov cov.info *.gcno *.gcda

set +x

# Echo the file as URI to quickly open the result using ctrl-click in terminal
echo "file://$OUT_COVERAGE/$MODULE_INSTALL_PATH/report/index.html"