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diff --git a/build/valgrind/output_handler.py b/build/valgrind/output_handler.py
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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 http://mozilla.org/MPL/2.0/.
+
+from __future__ import print_function, unicode_literals
+
+import logging
+import re
+
+class OutputHandler(object):
+ '''
+ A class for handling Valgrind output.
+
+ Valgrind errors look like this:
+
+ ==60741== 40 (24 direct, 16 indirect) bytes in 1 blocks are definitely lost in loss record 2,746 of 5,235
+ ==60741== at 0x4C26B43: calloc (vg_replace_malloc.c:593)
+ ==60741== by 0x63AEF65: PR_Calloc (prmem.c:443)
+ ==60741== by 0x69F236E: PORT_ZAlloc_Util (secport.c:117)
+ ==60741== by 0x69F1336: SECITEM_AllocItem_Util (secitem.c:28)
+ ==60741== by 0xA04280B: ffi_call_unix64 (in /builds/slave/m-in-l64-valgrind-000000000000/objdir/toolkit/library/libxul.so)
+ ==60741== by 0xA042443: ffi_call (ffi64.c:485)
+
+ For each such error, this class extracts most or all of the first (error
+ kind) line, plus the function name in each of the first few stack entries.
+ With this data it constructs and prints a TEST-UNEXPECTED-FAIL message that
+ TBPL will highlight.
+
+ It buffers these lines from which text is extracted so that the
+ TEST-UNEXPECTED-FAIL message can be printed before the full error.
+
+ Parsing the Valgrind output isn't ideal, and it may break in the future if
+ Valgrind changes the format of the messages, or introduces new error kinds.
+ To protect against this, we also count how many lines containing
+ "<insert_a_suppression_name_here>" are seen. Thanks to the use of
+ --gen-suppressions=yes, exactly one of these lines is present per error. If
+ the count of these lines doesn't match the error count found during
+ parsing, then the parsing has missed one or more errors and we can fail
+ appropriately.
+ '''
+
+ def __init__(self, logger):
+ # The regexps in this list match all of Valgrind's errors. Note that
+ # Valgrind is English-only, so we don't have to worry about
+ # localization.
+ self.logger = logger
+ self.re_error = \
+ r'==\d+== (' + \
+ r'(Use of uninitialised value of size \d+)|' + \
+ r'(Conditional jump or move depends on uninitialised value\(s\))|' + \
+ r'(Syscall param .* contains uninitialised byte\(s\))|' + \
+ r'(Syscall param .* points to (unaddressable|uninitialised) byte\(s\))|' + \
+ r'((Unaddressable|Uninitialised) byte\(s\) found during client check request)|' + \
+ r'(Invalid free\(\) / delete / delete\[\] / realloc\(\))|' + \
+ r'(Mismatched free\(\) / delete / delete \[\])|' + \
+ r'(Invalid (read|write) of size \d+)|' + \
+ r'(Jump to the invalid address stated on the next line)|' + \
+ r'(Source and destination overlap in .*)|' + \
+ r'(.* bytes in .* blocks are .* lost)' + \
+ r')'
+ # Match identifer chars, plus ':' for namespaces, and '\?' in order to
+ # match "???" which Valgrind sometimes produces.
+ self.re_stack_entry = r'^==\d+==.*0x[A-Z0-9]+: ([A-Za-z0-9_:\?]+)'
+ self.re_suppression = r' *<insert_a_suppression_name_here>'
+ self.error_count = 0
+ self.suppression_count = 0
+ self.number_of_stack_entries_to_get = 0
+ self.curr_error = None
+ self.curr_location = None
+ self.buffered_lines = None
+
+ def log(self, line):
+ self.logger(logging.INFO, 'valgrind-output', {'line': line}, '{line}')
+
+ def __call__(self, line):
+ if self.number_of_stack_entries_to_get == 0:
+ # Look for the start of a Valgrind error.
+ m = re.search(self.re_error, line)
+ if m:
+ self.error_count += 1
+ self.number_of_stack_entries_to_get = 4
+ self.curr_error = m.group(1)
+ self.curr_location = ""
+ self.buffered_lines = [line]
+ else:
+ self.log(line)
+
+ else:
+ # We've recently found a Valgrind error, and are now extracting
+ # details from the first few stack entries.
+ self.buffered_lines.append(line)
+ m = re.match(self.re_stack_entry, line)
+ if m:
+ self.curr_location += m.group(1)
+ else:
+ self.curr_location += '?!?'
+
+ self.number_of_stack_entries_to_get -= 1
+ if self.number_of_stack_entries_to_get != 0:
+ self.curr_location += ' / '
+ else:
+ # We've finished getting the first few stack entries. Print the
+ # failure message and the buffered lines, and then reset state.
+ self.logger(logging.ERROR, 'valgrind-error-msg',
+ {'error': self.curr_error,
+ 'location': self.curr_location},
+ 'TEST-UNEXPECTED-FAIL | valgrind-test | {error} at {location}')
+ for b in self.buffered_lines:
+ self.log(b)
+ self.curr_error = None
+ self.curr_location = None
+ self.buffered_lines = None
+
+ if re.match(self.re_suppression, line):
+ self.suppression_count += 1
+