import re
import platform
import tempfile
-try:
- from io import StringIO
-except ImportError:
- from StringIO import StringIO
+import threading
import lit.ShUtil as ShUtil
import lit.Test as Test
import lit.util
+from lit.util import to_bytes, to_string
class InternalShellError(Exception):
def __init__(self, command, message):
# Use temporary files to replace /dev/null on Windows.
kAvoidDevNull = kIsWindows
-def executeShCmd(cmd, cfg, cwd, results):
+class ShellEnvironment(object):
+
+ """Mutable shell environment containing things like CWD and env vars.
+
+ Environment variables are not implemented, but cwd tracking is.
+ """
+
+ def __init__(self, cwd, env):
+ self.cwd = cwd
+ self.env = dict(env)
+
+class TimeoutHelper(object):
+ """
+ Object used to helper manage enforcing a timeout in
+ _executeShCmd(). It is passed through recursive calls
+ to collect processes that have been executed so that when
+ the timeout happens they can be killed.
+ """
+ def __init__(self, timeout):
+ self.timeout = timeout
+ self._procs = []
+ self._timeoutReached = False
+ self._doneKillPass = False
+ # This lock will be used to protect concurrent access
+ # to _procs and _doneKillPass
+ self._lock = None
+ self._timer = None
+
+ def cancel(self):
+ if not self.active():
+ return
+ self._timer.cancel()
+
+ def active(self):
+ return self.timeout > 0
+
+ def addProcess(self, proc):
+ if not self.active():
+ return
+ needToRunKill = False
+ with self._lock:
+ self._procs.append(proc)
+ # Avoid re-entering the lock by finding out if kill needs to be run
+ # again here but call it if necessary once we have left the lock.
+ # We could use a reentrant lock here instead but this code seems
+ # clearer to me.
+ needToRunKill = self._doneKillPass
+
+ # The initial call to _kill() from the timer thread already happened so
+ # we need to call it again from this thread, otherwise this process
+ # will be left to run even though the timeout was already hit
+ if needToRunKill:
+ assert self.timeoutReached()
+ self._kill()
+
+ def startTimer(self):
+ if not self.active():
+ return
+
+ # Do some late initialisation that's only needed
+ # if there is a timeout set
+ self._lock = threading.Lock()
+ self._timer = threading.Timer(self.timeout, self._handleTimeoutReached)
+ self._timer.start()
+
+ def _handleTimeoutReached(self):
+ self._timeoutReached = True
+ self._kill()
+
+ def timeoutReached(self):
+ return self._timeoutReached
+
+ def _kill(self):
+ """
+ This method may be called multiple times as we might get unlucky
+ and be in the middle of creating a new process in _executeShCmd()
+ which won't yet be in ``self._procs``. By locking here and in
+ addProcess() we should be able to kill processes launched after
+ the initial call to _kill()
+ """
+ with self._lock:
+ for p in self._procs:
+ lit.util.killProcessAndChildren(p.pid)
+ # Empty the list and note that we've done a pass over the list
+ self._procs = [] # Python2 doesn't have list.clear()
+ self._doneKillPass = True
+
+def executeShCmd(cmd, shenv, results, timeout=0):
+ """
+ Wrapper around _executeShCmd that handles
+ timeout
+ """
+ # Use the helper even when no timeout is required to make
+ # other code simpler (i.e. avoid bunch of ``!= None`` checks)
+ timeoutHelper = TimeoutHelper(timeout)
+ if timeout > 0:
+ timeoutHelper.startTimer()
+ finalExitCode = _executeShCmd(cmd, shenv, results, timeoutHelper)
+ timeoutHelper.cancel()
+ timeoutInfo = None
+ if timeoutHelper.timeoutReached():
+ timeoutInfo = 'Reached timeout of {} seconds'.format(timeout)
+
+ return (finalExitCode, timeoutInfo)
+
+def _executeShCmd(cmd, shenv, results, timeoutHelper):
+ if timeoutHelper.timeoutReached():
+ # Prevent further recursion if the timeout has been hit
+ # as we should try avoid launching more processes.
+ return None
+
if isinstance(cmd, ShUtil.Seq):
if cmd.op == ';':
- res = executeShCmd(cmd.lhs, cfg, cwd, results)
- return executeShCmd(cmd.rhs, cfg, cwd, results)
+ res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
+ return _executeShCmd(cmd.rhs, shenv, results, timeoutHelper)
if cmd.op == '&':
raise InternalShellError(cmd,"unsupported shell operator: '&'")
if cmd.op == '||':
- res = executeShCmd(cmd.lhs, cfg, cwd, results)
+ res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
if res != 0:
- res = executeShCmd(cmd.rhs, cfg, cwd, results)
+ res = _executeShCmd(cmd.rhs, shenv, results, timeoutHelper)
return res
if cmd.op == '&&':
- res = executeShCmd(cmd.lhs, cfg, cwd, results)
+ res = _executeShCmd(cmd.lhs, shenv, results, timeoutHelper)
if res is None:
return res
if res == 0:
- res = executeShCmd(cmd.rhs, cfg, cwd, results)
+ res = _executeShCmd(cmd.rhs, shenv, results, timeoutHelper)
return res
raise ValueError('Unknown shell command: %r' % cmd.op)
-
assert isinstance(cmd, ShUtil.Pipeline)
+
+ # Handle shell builtins first.
+ if cmd.commands[0].args[0] == 'cd':
+ if len(cmd.commands) != 1:
+ raise ValueError("'cd' cannot be part of a pipeline")
+ if len(cmd.commands[0].args) != 2:
+ raise ValueError("'cd' supports only one argument")
+ newdir = cmd.commands[0].args[1]
+ # Update the cwd in the parent environment.
+ if os.path.isabs(newdir):
+ shenv.cwd = newdir
+ else:
+ shenv.cwd = os.path.join(shenv.cwd, newdir)
+ # The cd builtin always succeeds. If the directory does not exist, the
+ # following Popen calls will fail instead.
+ return 0
+
procs = []
input = subprocess.PIPE
stderrTempFiles = []
# output. This is null until we have seen some output using
# stderr.
for i,j in enumerate(cmd.commands):
+ # Reference the global environment by default.
+ cmd_shenv = shenv
+ if j.args[0] == 'env':
+ # Create a copy of the global environment and modify it for this one
+ # command. There might be multiple envs in a pipeline:
+ # env FOO=1 llc < %s | env BAR=2 llvm-mc | FileCheck %s
+ cmd_shenv = ShellEnvironment(shenv.cwd, shenv.env)
+ arg_idx = 1
+ for arg_idx, arg in enumerate(j.args[1:]):
+ # Partition the string into KEY=VALUE.
+ key, eq, val = arg.partition('=')
+ # Stop if there was no equals.
+ if eq == '':
+ break
+ cmd_shenv.env[key] = val
+ j.args = j.args[arg_idx+1:]
+
# Apply the redirections, we use (N,) as a sentinel to indicate stdin,
# stdout, stderr for N equal to 0, 1, or 2 respectively. Redirects to or
# from a file are represented with a list [file, mode, file-object]
if kAvoidDevNull and r[0] == '/dev/null':
r[2] = tempfile.TemporaryFile(mode=r[1])
else:
- r[2] = open(r[0], r[1])
+ # Make sure relative paths are relative to the cwd.
+ redir_filename = os.path.join(cmd_shenv.cwd, r[0])
+ r[2] = open(redir_filename, r[1])
# Workaround a Win32 and/or subprocess bug when appending.
#
# FIXME: Actually, this is probably an instance of PR6753.
# Resolve the executable path ourselves.
args = list(j.args)
- args[0] = lit.util.which(args[0], cfg.environment['PATH'])
- if not args[0]:
+ executable = None
+ # For paths relative to cwd, use the cwd of the shell environment.
+ if args[0].startswith('.'):
+ exe_in_cwd = os.path.join(cmd_shenv.cwd, args[0])
+ if os.path.isfile(exe_in_cwd):
+ executable = exe_in_cwd
+ if not executable:
+ executable = lit.util.which(args[0], cmd_shenv.env['PATH'])
+ if not executable:
raise InternalShellError(j, '%r: command not found' % j.args[0])
# Replace uses of /dev/null with temporary files.
named_temp_files.append(f.name)
args[i] = f.name
- procs.append(subprocess.Popen(args, cwd=cwd,
- stdin = stdin,
- stdout = stdout,
- stderr = stderr,
- env = cfg.environment,
- close_fds = kUseCloseFDs))
+ try:
+ procs.append(subprocess.Popen(args, cwd=cmd_shenv.cwd,
+ executable = executable,
+ stdin = stdin,
+ stdout = stdout,
+ stderr = stderr,
+ env = cmd_shenv.env,
+ close_fds = kUseCloseFDs))
+ # Let the helper know about this process
+ timeoutHelper.addProcess(procs[-1])
+ except OSError as e:
+ raise InternalShellError(j, 'Could not create process ({}) due to {}'.format(executable, e))
# Immediately close stdin for any process taking stdin from us.
if stdin == subprocess.PIPE:
f.seek(0, 0)
procData[i] = (procData[i][0], f.read())
+ def to_string(bytes):
+ if isinstance(bytes, str):
+ return bytes
+ return bytes.encode('utf-8')
+
exitCode = None
for i,(out,err) in enumerate(procData):
res = procs[i].wait()
if res == -signal.SIGINT:
raise KeyboardInterrupt
- results.append((cmd.commands[i], out, err, res))
+ # Ensure the resulting output is always of string type.
+ try:
+ out = to_string(out.decode('utf-8'))
+ except:
+ out = str(out)
+ try:
+ err = to_string(err.decode('utf-8'))
+ except:
+ err = str(err)
+
+ results.append((cmd.commands[i], out, err, res, timeoutHelper.timeoutReached()))
if cmd.pipe_err:
# Python treats the exit code as a signed char.
if exitCode is None:
cmds.append(ShUtil.ShParser(ln, litConfig.isWindows,
test.config.pipefail).parse())
except:
- return (Test.FAIL, "shell parser error on: %r" % ln)
+ return lit.Test.Result(Test.FAIL, "shell parser error on: %r" % ln)
cmd = cmds[0]
for c in cmds[1:]:
cmd = ShUtil.Seq(cmd, '&&', c)
results = []
+ timeoutInfo = None
try:
- exitCode = executeShCmd(cmd, test.config, cwd, results)
+ shenv = ShellEnvironment(cwd, test.config.environment)
+ exitCode, timeoutInfo = executeShCmd(cmd, shenv, results, timeout=litConfig.maxIndividualTestTime)
except InternalShellError:
e = sys.exc_info()[1]
exitCode = 127
- results.append((e.command, '', e.message, exitCode))
+ results.append((e.command, '', e.message, exitCode, False))
out = err = ''
- for i,(cmd, cmd_out,cmd_err,res) in enumerate(results):
+ for i,(cmd, cmd_out, cmd_err, res, timeoutReached) in enumerate(results):
out += 'Command %d: %s\n' % (i, ' '.join('"%s"' % s for s in cmd.args))
out += 'Command %d Result: %r\n' % (i, res)
+ if litConfig.maxIndividualTestTime > 0:
+ out += 'Command %d Reached Timeout: %s\n\n' % (i, str(timeoutReached))
out += 'Command %d Output:\n%s\n\n' % (i, cmd_out)
out += 'Command %d Stderr:\n%s\n\n' % (i, cmd_err)
- return out, err, exitCode
+ return out, err, exitCode, timeoutInfo
def executeScript(test, litConfig, tmpBase, commands, cwd):
bashPath = litConfig.getBashPath();
# run on clang with no real loss.
command = litConfig.valgrindArgs + command
- return lit.util.executeCommand(command, cwd=cwd,
- env=test.config.environment)
-
-def isExpectedFail(test, xfails):
- # Check if any of the xfails match an available feature or the target.
- for item in xfails:
- # If this is the wildcard, it always fails.
- if item == '*':
- return True
-
- # If this is an exact match for one of the features, it fails.
- if item in test.config.available_features:
- return True
-
- # If this is a part of the target triple, it fails.
- if item in test.suite.config.target_triple:
- return True
-
- return False
-
-def parseIntegratedTestScriptCommands(sourcepath):
+ try:
+ out, err, exitCode = lit.util.executeCommand(command, cwd=cwd,
+ env=test.config.environment,
+ timeout=litConfig.maxIndividualTestTime)
+ return (out, err, exitCode, None)
+ except lit.util.ExecuteCommandTimeoutException as e:
+ return (e.out, e.err, e.exitCode, e.msg)
+
+def parseIntegratedTestScriptCommands(source_path, keywords):
"""
parseIntegratedTestScriptCommands(source_path) -> commands
Parse the commands in an integrated test script file into a list of
(line_number, command_type, line).
"""
- line_number = 0
- for ln in open(sourcepath):
- line_number += 1
- if 'RUN:' in ln:
- yield (line_number, 'RUN', ln[ln.index('RUN:')+4:])
- elif 'XFAIL:' in ln:
- yield (line_number, 'XFAIL', ln[ln.index('XFAIL:') + 6:])
- elif 'REQUIRES:' in ln:
- yield (line_number, 'REQUIRES', ln[ln.index('REQUIRES:') + 9:])
- elif 'END.' in ln:
- yield (line_number, 'END', ln[ln.index('END.') + 4:])
-
-def parseIntegratedTestScript(test, normalize_slashes=False,
- extra_substitutions=[]):
- """parseIntegratedTestScript - Scan an LLVM/Clang style integrated test
- script and extract the lines to 'RUN' as well as 'XFAIL' and 'REQUIRES'
- information. The RUN lines also will have variable substitution performed.
- """
- # Get the temporary location, this is always relative to the test suite
- # root, not test source root.
+ # This code is carefully written to be dual compatible with Python 2.5+ and
+ # Python 3 without requiring input files to always have valid codings. The
+ # trick we use is to open the file in binary mode and use the regular
+ # expression library to find the commands, with it scanning strings in
+ # Python2 and bytes in Python3.
#
- # FIXME: This should not be here?
- sourcepath = test.getSourcePath()
- sourcedir = os.path.dirname(sourcepath)
+ # Once we find a match, we do require each script line to be decodable to
+ # UTF-8, so we convert the outputs to UTF-8 before returning. This way the
+ # remaining code can work with "strings" agnostic of the executing Python
+ # version.
+
+ keywords_re = re.compile(
+ to_bytes("(%s)(.*)\n" % ("|".join(k for k in keywords),)))
+
+ f = open(source_path, 'rb')
+ try:
+ # Read the entire file contents.
+ data = f.read()
+
+ # Ensure the data ends with a newline.
+ if not data.endswith(to_bytes('\n')):
+ data = data + to_bytes('\n')
+
+ # Iterate over the matches.
+ line_number = 1
+ last_match_position = 0
+ for match in keywords_re.finditer(data):
+ # Compute the updated line number by counting the intervening
+ # newlines.
+ match_position = match.start()
+ line_number += data.count(to_bytes('\n'), last_match_position,
+ match_position)
+ last_match_position = match_position
+
+ # Convert the keyword and line to UTF-8 strings and yield the
+ # command. Note that we take care to return regular strings in
+ # Python 2, to avoid other code having to differentiate between the
+ # str and unicode types.
+ keyword,ln = match.groups()
+ yield (line_number, to_string(keyword[:-1].decode('utf-8')),
+ to_string(ln.decode('utf-8')))
+ finally:
+ f.close()
+
+def getTempPaths(test):
+ """Get the temporary location, this is always relative to the test suite
+ root, not test source root."""
execpath = test.getExecPath()
execdir,execbase = os.path.split(execpath)
tmpDir = os.path.join(execdir, 'Output')
tmpBase = os.path.join(tmpDir, execbase)
+ return tmpDir, tmpBase
+
+def getDefaultSubstitutions(test, tmpDir, tmpBase, normalize_slashes=False):
+ sourcepath = test.getSourcePath()
+ sourcedir = os.path.dirname(sourcepath)
# Normalize slashes, if requested.
if normalize_slashes:
tmpBase = tmpBase.replace('\\', '/')
# We use #_MARKER_# to hide %% while we do the other substitutions.
- substitutions = list(extra_substitutions)
+ substitutions = []
substitutions.extend([('%%', '#_MARKER_#')])
substitutions.extend(test.config.substitutions)
substitutions.extend([('%s', sourcepath),
('%/t', tmpBase.replace('\\', '/') + '.tmp'),
('%/T', tmpDir.replace('\\', '/')),
])
+ return substitutions
+
+def applySubstitutions(script, substitutions):
+ """Apply substitutions to the script. Allow full regular expression syntax.
+ Replace each matching occurrence of regular expression pattern a with
+ substitution b in line ln."""
+ def processLine(ln):
+ # Apply substitutions
+ for a,b in substitutions:
+ if kIsWindows:
+ b = b.replace("\\","\\\\")
+ ln = re.sub(a, b, ln)
+
+ # Strip the trailing newline and any extra whitespace.
+ return ln.strip()
+ # Note Python 3 map() gives an iterator rather than a list so explicitly
+ # convert to list before returning.
+ return list(map(processLine, script))
+def parseIntegratedTestScript(test, require_script=True):
+ """parseIntegratedTestScript - Scan an LLVM/Clang style integrated test
+ script and extract the lines to 'RUN' as well as 'XFAIL' and 'REQUIRES'
+ and 'UNSUPPORTED' information. If 'require_script' is False an empty script
+ may be returned. This can be used for test formats where the actual script
+ is optional or ignored.
+ """
# Collect the test lines from the script.
+ sourcepath = test.getSourcePath()
script = []
- xfails = []
requires = []
+ unsupported = []
+ keywords = ['RUN:', 'XFAIL:', 'REQUIRES:', 'UNSUPPORTED:', 'END.']
for line_number, command_type, ln in \
- parseIntegratedTestScriptCommands(sourcepath):
+ parseIntegratedTestScriptCommands(sourcepath, keywords):
if command_type == 'RUN':
# Trim trailing whitespace.
ln = ln.rstrip()
else:
script.append(ln)
elif command_type == 'XFAIL':
- xfails.extend([s.strip() for s in ln.split(',')])
+ test.xfails.extend([s.strip() for s in ln.split(',')])
elif command_type == 'REQUIRES':
requires.extend([s.strip() for s in ln.split(',')])
+ elif command_type == 'UNSUPPORTED':
+ unsupported.extend([s.strip() for s in ln.split(',')])
elif command_type == 'END':
# END commands are only honored if the rest of the line is empty.
if not ln.strip():
raise ValueError("unknown script command type: %r" % (
command_type,))
- # Apply substitutions to the script. Allow full regular
- # expression syntax. Replace each matching occurrence of regular
- # expression pattern a with substitution b in line ln.
- def processLine(ln):
- # Apply substitutions
- for a,b in substitutions:
- if kIsWindows:
- b = b.replace("\\","\\\\")
- ln = re.sub(a, b, ln)
-
- # Strip the trailing newline and any extra whitespace.
- return ln.strip()
- script = [processLine(ln)
- for ln in script]
-
# Verify the script contains a run line.
- if not script:
- return (Test.UNRESOLVED, "Test has no run line!")
+ if require_script and not script:
+ return lit.Test.Result(Test.UNRESOLVED, "Test has no run line!")
# Check for unterminated run lines.
- if script[-1][-1] == '\\':
- return (Test.UNRESOLVED, "Test has unterminated run lines (with '\\')")
+ if script and script[-1][-1] == '\\':
+ return lit.Test.Result(Test.UNRESOLVED,
+ "Test has unterminated run lines (with '\\')")
# Check that we have the required features:
missing_required_features = [f for f in requires
if f not in test.config.available_features]
if missing_required_features:
msg = ', '.join(missing_required_features)
- return (Test.UNSUPPORTED,
- "Test requires the following features: %s" % msg)
-
- isXFail = isExpectedFail(test, xfails)
- return script,isXFail,tmpBase,execdir
-
-def formatTestOutput(status, out, err, exitCode, script):
- output = StringIO()
- output.write(u"Script:\n")
- output.write(u"--\n")
- output.write(u'\n'.join(script))
- output.write(u"\n--\n")
- output.write(u"Exit Code: %r\n\n" % exitCode)
- if out:
- output.write(u"Command Output (stdout):\n")
- output.write(u"--\n")
- output.write(unicode(out))
- output.write(u"--\n")
- if err:
- output.write(u"Command Output (stderr):\n")
- output.write(u"--\n")
- output.write(unicode(err))
- output.write(u"--\n")
- return (status, output.getvalue())
-
-def executeShTest(test, litConfig, useExternalSh,
- extra_substitutions=[]):
- if test.config.unsupported:
- return (Test.UNSUPPORTED, 'Test is unsupported')
-
- res = parseIntegratedTestScript(test, useExternalSh, extra_substitutions)
- if len(res) == 2:
- return res
-
- script, isXFail, tmpBase, execdir = res
-
- if litConfig.noExecute:
- return (Test.PASS, '')
-
+ return lit.Test.Result(Test.UNSUPPORTED,
+ "Test requires the following features: %s" % msg)
+ unsupported_features = [f for f in unsupported
+ if f in test.config.available_features]
+ if unsupported_features:
+ msg = ', '.join(unsupported_features)
+ return lit.Test.Result(Test.UNSUPPORTED,
+ "Test is unsupported with the following features: %s" % msg)
+
+ unsupported_targets = [f for f in unsupported
+ if f in test.suite.config.target_triple]
+ if unsupported_targets:
+ return lit.Test.Result(Test.UNSUPPORTED,
+ "Test is unsupported with the following triple: %s" % (
+ test.suite.config.target_triple,))
+
+ if test.config.limit_to_features:
+ # Check that we have one of the limit_to_features features in requires.
+ limit_to_features_tests = [f for f in test.config.limit_to_features
+ if f in requires]
+ if not limit_to_features_tests:
+ msg = ', '.join(test.config.limit_to_features)
+ return lit.Test.Result(Test.UNSUPPORTED,
+ "Test requires one of the limit_to_features features %s" % msg)
+
+ return script
+
+def _runShTest(test, litConfig, useExternalSh, script, tmpBase):
# Create the output directory if it does not already exist.
lit.util.mkdir_p(os.path.dirname(tmpBase))
+ execdir = os.path.dirname(test.getExecPath())
if useExternalSh:
res = executeScript(test, litConfig, tmpBase, script, execdir)
else:
res = executeScriptInternal(test, litConfig, tmpBase, script, execdir)
- if len(res) == 2:
+ if isinstance(res, lit.Test.Result):
return res
- out,err,exitCode = res
- if isXFail:
- ok = exitCode != 0
- if ok:
- status = Test.XFAIL
- else:
- status = Test.XPASS
+ out,err,exitCode,timeoutInfo = res
+ if exitCode == 0:
+ status = Test.PASS
else:
- ok = exitCode == 0
- if ok:
- status = Test.PASS
- else:
+ if timeoutInfo == None:
status = Test.FAIL
+ else:
+ status = Test.TIMEOUT
+
+ # Form the output log.
+ output = """Script:\n--\n%s\n--\nExit Code: %d\n""" % (
+ '\n'.join(script), exitCode)
+
+ if timeoutInfo != None:
+ output += """Timeout: %s\n""" % (timeoutInfo,)
+ output += "\n"
- if ok:
- return (status,'')
+ # Append the outputs, if present.
+ if out:
+ output += """Command Output (stdout):\n--\n%s\n--\n""" % (out,)
+ if err:
+ output += """Command Output (stderr):\n--\n%s\n--\n""" % (err,)
+
+ return lit.Test.Result(status, output)
+
+
+def executeShTest(test, litConfig, useExternalSh,
+ extra_substitutions=[]):
+ if test.config.unsupported:
+ return (Test.UNSUPPORTED, 'Test is unsupported')
- return formatTestOutput(status, out, err, exitCode, script)
+ script = parseIntegratedTestScript(test)
+ if isinstance(script, lit.Test.Result):
+ return script
+ if litConfig.noExecute:
+ return lit.Test.Result(Test.PASS)
+
+ tmpDir, tmpBase = getTempPaths(test)
+ substitutions = list(extra_substitutions)
+ substitutions += getDefaultSubstitutions(test, tmpDir, tmpBase,
+ normalize_slashes=useExternalSh)
+ script = applySubstitutions(script, substitutions)
+
+ # Re-run failed tests up to test_retry_attempts times.
+ attempts = 1
+ if hasattr(test.config, 'test_retry_attempts'):
+ attempts += test.config.test_retry_attempts
+ for i in range(attempts):
+ res = _runShTest(test, litConfig, useExternalSh, script, tmpBase)
+ if res.code != Test.FAIL:
+ break
+ # If we had to run the test more than once, count it as a flaky pass. These
+ # will be printed separately in the test summary.
+ if i > 0 and res.code == Test.PASS:
+ res.code = Test.FLAKYPASS
+ return res
projects / oota-llvm.git / blobdiff