build/valgrind/output_handler.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this
   3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 from __future__ import print_function, unicode_literals
   6
   7 import re
   8
   9 class OutputHandler(object):
  10     '''
  11     A class for handling Valgrind output.
  12
  13     Valgrind errors look like this:
  14
  15     ==60741== 40 (24 direct, 16 indirect) bytes in 1 blocks are definitely lost in loss record 2,746 of 5,235
  16     ==60741==    at 0x4C26B43: calloc (vg_replace_malloc.c:593)
  17     ==60741==    by 0x63AEF65: PR_Calloc (prmem.c:443)
  18     ==60741==    by 0x69F236E: PORT_ZAlloc_Util (secport.c:117)
  19     ==60741==    by 0x69F1336: SECITEM_AllocItem_Util (secitem.c:28)
  20     ==60741==    by 0xA04280B: ffi_call_unix64 (in /builds/slave/m-in-l64-valgrind-000000000000/objdir/toolkit/library/libxul.so)
  21     ==60741==    by 0xA042443: ffi_call (ffi64.c:485)
  22
  23     For each such error, this class extracts most or all of the first (error
  24     kind) line, plus the function name in each of the first few stack entries.
  25     With this data it constructs and prints a TEST-UNEXPECTED-FAIL message that
  26     TBPL will highlight.
  27
  28     It buffers these lines from which text is extracted so that the
  29     TEST-UNEXPECTED-FAIL message can be printed before the full error.
  30
  31     Parsing the Valgrind output isn't ideal, and it may break in the future if
  32     Valgrind changes the format of the messages, or introduces new error kinds.
  33     To protect against this, we also count how many lines containing
  34     "<insert_a_suppression_name_here>" are seen. Thanks to the use of
  35     --gen-suppressions=yes, exactly one of these lines is present per error. If
  36     the count of these lines doesn't match the error count found during
  37     parsing, then the parsing has missed one or more errors and we can fail
  38     appropriately.
  39     '''
  40
  41     def __init__(self):
  42         # The regexps in this list match all of Valgrind's errors. Note that
  43         # Valgrind is English-only, so we don't have to worry about
  44         # localization.
  45         self.re_error = \
  46             r'==\d+== (' + \
  47             r'(Use of uninitialised value of size \d+)|' + \
  48             r'(Conditional jump or move depends on uninitialised value\(s\))|' + \
  49             r'(Syscall param .* contains uninitialised byte\(s\))|' + \
  50             r'(Syscall param .* points to (unaddressable|uninitialised) byte\(s\))|' + \
  51             r'((Unaddressable|Uninitialised) byte\(s\) found during client check request)|' + \
  52             r'(Invalid free\(\) / delete / delete\[\] / realloc\(\))|' + \
  53             r'(Mismatched free\(\) / delete / delete \[\])|' + \
  54             r'(Invalid (read|write) of size \d+)|' + \
  55             r'(Jump to the invalid address stated on the next line)|' + \
  56             r'(Source and destination overlap in .*)|' + \
  57             r'(.* bytes in .* blocks are .* lost)' + \
  58             r')'
  59         # Match identifer chars, plus ':' for namespaces, and '\?' in order to
  60         # match "???" which Valgrind sometimes produces.
  61         self.re_stack_entry = r'^==\d+==.*0x[A-Z0-9]+: ([A-Za-z0-9_:\?]+)'
  62         self.re_suppression = r' *<insert_a_suppression_name_here>'
  63         self.error_count = 0
  64         self.suppression_count = 0
  65         self.number_of_stack_entries_to_get = 0
  66         self.curr_failure_msg = None
  67         self.buffered_lines = None
  68
  69     def __call__(self, line):
  70         if self.number_of_stack_entries_to_get == 0:
  71             # Look for the start of a Valgrind error.
  72             m = re.search(self.re_error, line)
  73             if m:
  74                 self.error_count += 1
  75                 self.number_of_stack_entries_to_get = 4
  76                 self.curr_failure_msg = 'TEST-UNEXPECTED-FAIL | valgrind-test | ' + m.group(1) + " at "
  77                 self.buffered_lines = [line]
  78             else:
  79                 print(line)
  80
  81         else:
  82             # We've recently found a Valgrind error, and are now extracting
  83             # details from the first few stack entries.
  84             self.buffered_lines.append(line)
  85             m = re.match(self.re_stack_entry, line)
  86             if m:
  87                 self.curr_failure_msg += m.group(1)
  88             else:
  89                 self.curr_failure_msg += '?!?'
  90
  91             self.number_of_stack_entries_to_get -= 1
  92             if self.number_of_stack_entries_to_get != 0:
  93                 self.curr_failure_msg += ' / '
  94             else:
  95                 # We've finished getting the first few stack entries. Print the
  96                 # failure message and the buffered lines, and then reset state.
  97                 print('\n' + self.curr_failure_msg + '\n')
  98                 for b in self.buffered_lines:
  99                     print(b)
 100                 self.curr_failure_msg = None
 101                 self.buffered_lines = None
 102
 103         if re.match(self.re_suppression, line):
 104             self.suppression_count += 1
 105