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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
from __future__ import absolute_import
import re
class LSANLeaks(object):
Parses the log when running an LSAN build, looking for interesting stack frames
in allocation stacks
def __init__(
self.logger = logger
self.inReport = False
self.fatalError = False
self.symbolizerError = False
self.foundFrames = set()
self.recordMoreFrames = None
self.currStack = None
self.maxNumRecordedFrames = maxNumRecordedFrames if maxNumRecordedFrames else 4
self.summaryData = None
self.scope = scope
self.allowedMatch = None
self.allowAll = allowAll
self.sawError = False
# Don't various allocation-related stack frames, as they do not help much to
# distinguish different leaks.
unescapedSkipList = [
self.skipListRegExp = re.compile(
"^" + "|".join([re.escape(f) for f in unescapedSkipList]) + "$"
self.startRegExp = re.compile(
"==\d+==ERROR: LeakSanitizer: detected memory leaks"
self.fatalErrorRegExp = re.compile(
"==\d+==LeakSanitizer has encountered a fatal error."
self.symbolizerOomRegExp = re.compile(
"LLVMSymbolizer: error reading file: Cannot allocate memory"
self.stackFrameRegExp = re.compile(" #\d+ 0x[0-9a-f]+ in ([^(</]+)")
self.sysLibStackFrameRegExp = re.compile(
" #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)"
self.summaryRegexp = re.compile(
"SUMMARY: AddressSanitizer: (\d+) byte\(s\) leaked in (\d+) allocation\(s\)."
self.rustRegexp = re.compile("::h[a-f0-9]{16}$")
def setAllowed(self, allowedLines):
if not allowedLines or self.allowAll:
self.allowedRegexp = None
self.allowedRegexp = re.compile(
"^" + "|".join([re.escape(f) for f in allowedLines])
def log(self, line):
if re.match(self.startRegExp, line):
self.inReport = True
# Downgrade this from an ERROR
self.sawError = True
return "LeakSanitizer: detected memory leaks"
if re.match(self.fatalErrorRegExp, line):
self.fatalError = True
return line
if re.match(self.symbolizerOomRegExp, line):
self.symbolizerError = True
return line
if not self.inReport:
return line
if line.startswith("Direct leak") or line.startswith("Indirect leak"):
self.recordMoreFrames = True
self.currStack = []
return line
summaryData = self.summaryRegexp.match(line)
if summaryData:
assert self.summaryData is None
self.inReport = False
self.summaryData = (int(item) for item in summaryData.groups())
# We don't return the line here because we want to control whether the
# leak is seen as an expected failure later
if not self.recordMoreFrames:
return line
stackFrame = re.match(self.stackFrameRegExp, line)
if stackFrame:
# Split the frame to remove any return types.
frame =[-1]
if not re.match(self.skipListRegExp, frame):
return line
sysLibStackFrame = re.match(self.sysLibStackFrameRegExp, line)
if sysLibStackFrame:
# System library stack frames will never match the skip list,
# so don't bother checking if they do.
# If we don't match either of these, just ignore the frame.
# We'll end up with "unknown stack" if everything is ignored.
return line
def process(self):
failures = 0
if self.allowAll:"LeakSanitizer | Leak checks disabled")
if self.summaryData:
allowed = all(allowed for _, allowed in self.foundFrames)
self.logger.lsan_summary(*self.summaryData, allowed=allowed)
self.summaryData = None
if self.fatalError:
"LeakSanitizer | LeakSanitizer has encountered a fatal error."
failures += 1
if self.symbolizerError:
"LeakSanitizer | LLVMSymbolizer was unable to allocate memory.\n"
"This will cause leaks that "
"should be ignored to instead be reported as an error"
failures += 1
if self.foundFrames:
"LeakSanitizer | To show the "
"addresses of leaked objects add report_objects=1 to LSAN_OPTIONS\n"
"This can be done in testing/mozbase/mozrunner/mozrunner/"
)"Allowed depth was %d" % self.maxNumRecordedFrames)
for frames, allowed in self.foundFrames:
self.logger.lsan_leak(frames, scope=self.scope, allowed_match=allowed)
if not allowed:
failures += 1
if self.sawError and not (
or self.foundFrames
or self.fatalError
or self.symbolizerError
"LeakSanitizer | Memory leaks detected but no leak report generated"
self.sawError = False
return failures
def _finishStack(self):
if self.recordMoreFrames and len(self.currStack) == 0:
self.currStack = {"unknown stack"}
if self.currStack:
self.foundFrames.add((tuple(self.currStack), self.allowedMatch))
self.currStack = None
self.allowedMatch = None
self.recordMoreFrames = False
self.numRecordedFrames = 0
def _recordFrame(self, frame):
if self.allowedMatch is None and self.allowedRegexp is not None:
self.allowedMatch = frame if self.allowedRegexp.match(frame) else None
frame = self._cleanFrame(frame)
self.numRecordedFrames += 1
if self.numRecordedFrames >= self.maxNumRecordedFrames:
self.recordMoreFrames = False
def _cleanFrame(self, frame):
# Rust frames aren't properly demangled and in particular can contain
# some trailing junk of the form ::h[a-f0-9]{16} that changes with
# compiler versions; see bug 1507350.
return self.rustRegexp.sub("", frame)