def _SetupOutputDir():
"""Setup output directory."""
if os.path.exists(OUTPUT_DIR):
shutil.rmtree(OUTPUT_DIR)
# Creates |OUTPUT_DIR| and its platform sub-directory.
os.makedirs(coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR))
def _ExecuteCommand(target, command, output_file_path):
"""Runs a single command and generates a profraw data file."""
# Per Clang "Source-based Code Coverage" doc:
#
# "%p" expands out to the process ID. It's not used by this scripts due to:
# 1) If a target program spawns too many processess, it may exhaust all disk
# space available. For example, unit_tests writes thousands of .profraw
# files each of size 1GB+.
# 2) If a target binary uses shared libraries, coverage profile data for them
# will be missing, resulting in incomplete coverage reports.
#
# "%Nm" expands out to the instrumented binary's signature. When this pattern
# is specified, the runtime creates a pool of N raw profiles which are used
# for on-line profile merging. The runtime takes care of selecting a raw
# profile from the pool, locking it, and updating it before the program exits.
# N must be between 1 and 9. The merge pool specifier can only occur once per
# filename pattern.
#
# "%1m" is used when tests run in single process, such as fuzz targets.
#
# For other cases, "%4m" is chosen as it creates some level of parallelism,
# but it's not too big to consume too much computing resource or disk space.
profile_pattern_string = '%1m' if _IsFuzzerTarget(target) else '%4m'
expected_profraw_file_name = os.extsep.join(
[target, profile_pattern_string, PROFRAW_FILE_EXTENSION])
expected_profraw_file_path = os.path.join(
coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR),
expected_profraw_file_name)
command = command.replace(LLVM_PROFILE_FILE_PATH_SUBSTITUTION,
expected_profraw_file_path)
try:
# Some fuzz targets or tests may write into stderr, redirect it as well.
with open(output_file_path, 'wb') as output_file_handle:
subprocess.check_call(
shlex.split(command),
stdout=output_file_handle,
stderr=subprocess.STDOUT,
env=_GetEnvironmentVars(expected_profraw_file_path))
except subprocess.CalledProcessError as e:
logging.warning('Command: "%s" exited with non-zero return code.',
command)
return open(output_file_path, 'rb').read()
def _GetTargetProfDataPathsByExecutingCommands(targets, commands):
"""Runs commands and returns the relative paths to the profraw data files.
Args:
targets: A list of targets built with coverage instrumentation.
commands: A list of commands used to run the targets.
Returns:
A list of relative paths to the generated profraw data files.
"""
logging.debug('Executing the test commands.')
# Remove existing profraw data files.
report_root_dir = coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR)
for file_or_dir in os.listdir(report_root_dir):
if file_or_dir.endswith(PROFRAW_FILE_EXTENSION):
os.remove(os.path.join(report_root_dir, file_or_dir))
# Ensure that logs directory exists.
if not os.path.exists(_GetLogsDirectoryPath()):
os.makedirs(_GetLogsDirectoryPath())
profdata_file_paths = []
# Run all test targets to generate profraw data files.
for target, command in zip(targets, commands):
output_file_name = os.extsep.join([target + '_output', 'log'])
output_file_path = os.path.join(_GetLogsDirectoryPath(),
output_file_name)
profdata_file_path = None
for _ in xrange(MERGE_RETRIES):
logging.info(
'Running command: "%s", the output is redirected to "%s".',
command, output_file_path)
if _IsIOSCommand(command):
# On iOS platform, due to lack of write permissions, profraw files are
# generated outside of the OUTPUT_DIR, and the exact paths are contained
# in the output of the command execution.
output = _ExecuteIOSCommand(command, output_file_path)
else:
# On other platforms, profraw files are generated inside the OUTPUT_DIR.
output = _ExecuteCommand(target, command, output_file_path)
profraw_file_paths = []
if _IsIOS():
profraw_file_paths = [
_GetProfrawDataFileByParsingOutput(output)
]
else:
for file_or_dir in os.listdir(report_root_dir):
if file_or_dir.endswith(PROFRAW_FILE_EXTENSION):
profraw_file_paths.append(
os.path.join(report_root_dir, file_or_dir))
assert profraw_file_paths, (
'Running target "%s" failed to generate any profraw data file, '
'please make sure the binary exists, is properly instrumented and '
'does not crash. %s' % (target, FILE_BUG_MESSAGE))
assert isinstance(profraw_file_paths, list), (
'Variable \'profraw_file_paths\' is expected to be of type \'list\', '
'but it is a %s. %s' %
(type(profraw_file_paths), FILE_BUG_MESSAGE))
try:
profdata_file_path = _CreateTargetProfDataFileFromProfRawFiles(
target, profraw_file_paths)
break
except Exception:
logging.info('Retrying...')
finally:
# Remove profraw files now so that they are not used in next iteration.
for profraw_file_path in profraw_file_paths:
os.remove(profraw_file_path)
assert profdata_file_path, (
'Failed to merge target "%s" profraw files after %d retries. %s' %
(target, MERGE_RETRIES, FILE_BUG_MESSAGE))
profdata_file_paths.append(profdata_file_path)
logging.debug('Finished executing the test commands.')
return profdata_file_paths
def _GetSummaryFilePath():
"""The JSON file that contains coverage summary written by llvm-cov export."""
return os.path.join(
coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR),
SUMMARY_FILE_NAME)
def _GetProfdataFilePath():
"""Path to the resulting .profdata file."""
return os.path.join(
coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR),
PROFDATA_FILE_NAME)
def _GetLogsDirectoryPath():
"""Path to the logs directory."""
return os.path.join(
coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR), LOGS_DIR_NAME)
def _GetLcovFilePath():
"""The LCOV file that contains coverage data written by llvm-cov export."""
return os.path.join(
coverage_utils.GetCoverageReportRootDirPath(OUTPUT_DIR),
LCOV_FILE_NAME)
