cc/PRESUBMIT.py

   1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 """Top-level presubmit script for cc.
   6
   7 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
   8 for more details about the presubmit API built into depot_tools.
   9 """
  10
  11 import re
  12 import string
  13
  14 CC_SOURCE_FILES=(r'^cc/.*\.(cc|h)$',)
  15
  16 def CheckChangeLintsClean(input_api, output_api):
  17   input_api.cpplint._cpplint_state.ResetErrorCounts()  # reset global state
  18   source_filter = lambda x: input_api.FilterSourceFile(
  19     x, white_list=CC_SOURCE_FILES, black_list=None)
  20   files = [f.AbsoluteLocalPath() for f in
  21            input_api.AffectedSourceFiles(source_filter)]
  22   level = 1  # strict, but just warn
  23
  24   for file_name in files:
  25     input_api.cpplint.ProcessFile(file_name, level)
  26
  27   if not input_api.cpplint._cpplint_state.error_count:
  28     return []
  29
  30   return [output_api.PresubmitPromptWarning(
  31     'Changelist failed cpplint.py check.')]
  32
  33 def CheckAsserts(input_api, output_api, white_list=CC_SOURCE_FILES, black_list=None):
  34   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
  35   source_file_filter = lambda x: input_api.FilterSourceFile(x, white_list, black_list)
  36
  37   assert_files = []
  38   notreached_files = []
  39
  40   for f in input_api.AffectedSourceFiles(source_file_filter):
  41     contents = input_api.ReadFile(f, 'rb')
  42     # WebKit ASSERT() is not allowed.
  43     if re.search(r"\bASSERT\(", contents):
  44       assert_files.append(f.LocalPath())
  45     # WebKit ASSERT_NOT_REACHED() is not allowed.
  46     if re.search(r"ASSERT_NOT_REACHED\(", contents):
  47       notreached_files.append(f.LocalPath())
  48
  49   if assert_files:
  50     return [output_api.PresubmitError(
  51       'These files use ASSERT instead of using DCHECK:',
  52       items=assert_files)]
  53   if notreached_files:
  54     return [output_api.PresubmitError(
  55       'These files use ASSERT_NOT_REACHED instead of using NOTREACHED:',
  56       items=notreached_files)]
  57   return []
  58
  59 def CheckStdAbs(input_api, output_api,
  60                 white_list=CC_SOURCE_FILES, black_list=None):
  61   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
  62   source_file_filter = lambda x: input_api.FilterSourceFile(x,
  63                                                             white_list,
  64                                                             black_list)
  65
  66   using_std_abs_files = []
  67   found_fabs_files = []
  68   missing_std_prefix_files = []
  69
  70   for f in input_api.AffectedSourceFiles(source_file_filter):
  71     contents = input_api.ReadFile(f, 'rb')
  72     if re.search(r"using std::f?abs;", contents):
  73       using_std_abs_files.append(f.LocalPath())
  74     if re.search(r"\bfabsf?\(", contents):
  75       found_fabs_files.append(f.LocalPath());
  76
  77     no_std_prefix = r"(?<!std::)"
  78     # Matches occurrences of abs/absf/fabs/fabsf without a "std::" prefix.
  79     abs_without_prefix = r"%s(\babsf?\()" % no_std_prefix
  80     fabs_without_prefix = r"%s(\bfabsf?\()" % no_std_prefix
  81     # Skips matching any lines that have "// NOLINT".
  82     no_nolint = r"(?![^\n]*//\s+NOLINT)"
  83
  84     expression = re.compile("(%s|%s)%s" %
  85         (abs_without_prefix, fabs_without_prefix, no_nolint))
  86     if expression.search(contents):
  87       missing_std_prefix_files.append(f.LocalPath())
  88
  89   result = []
  90   if using_std_abs_files:
  91     result.append(output_api.PresubmitError(
  92         'These files have "using std::abs" which is not permitted.',
  93         items=using_std_abs_files))
  94   if found_fabs_files:
  95     result.append(output_api.PresubmitError(
  96         'std::abs() should be used instead of std::fabs() for consistency.',
  97         items=found_fabs_files))
  98   if missing_std_prefix_files:
  99     result.append(output_api.PresubmitError(
 100         'These files use abs(), absf(), fabs(), or fabsf() without qualifying '
 101         'the std namespace. Please use std::abs() in all places.',
 102         items=missing_std_prefix_files))
 103   return result
 104
 105 def CheckPassByValue(input_api,
 106                      output_api,
 107                      white_list=CC_SOURCE_FILES,
 108                      black_list=None):
 109   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
 110   source_file_filter = lambda x: input_api.FilterSourceFile(x,
 111                                                             white_list,
 112                                                             black_list)
 113
 114   local_errors = []
 115
 116   # Well-defined simple classes containing only <= 4 ints, or <= 2 floats.
 117   pass_by_value_types = ['base::Time',
 118                          'base::TimeTicks',
 119                          ]
 120
 121   for f in input_api.AffectedSourceFiles(source_file_filter):
 122     contents = input_api.ReadFile(f, 'rb')
 123     match = re.search(
 124       r'\bconst +' + '(?P<type>(%s))&' %
 125         string.join(pass_by_value_types, '|'),
 126       contents)
 127     if match:
 128       local_errors.append(output_api.PresubmitError(
 129         '%s passes %s by const ref instead of by value.' %
 130         (f.LocalPath(), match.group('type'))))
 131   return local_errors
 132
 133 def CheckTodos(input_api, output_api):
 134   errors = []
 135
 136   source_file_filter = lambda x: x
 137   for f in input_api.AffectedSourceFiles(source_file_filter):
 138     contents = input_api.ReadFile(f, 'rb')
 139     if ('FIX'+'ME') in contents:
 140       errors.append(f.LocalPath())
 141
 142   if errors:
 143     return [output_api.PresubmitError(
 144       'All TODO comments should be of the form TODO(name). ' +
 145       'Use TODO instead of FIX' + 'ME',
 146       items=errors)]
 147   return []
 148
 149 def FindUnquotedQuote(contents, pos):
 150   match = re.search(r"(?<!\\)(?P<quote>\")", contents[pos:])
 151   return -1 if not match else match.start("quote") + pos
 152
 153 def FindUselessIfdefs(input_api, output_api):
 154   errors = []
 155   source_file_filter = lambda x: x
 156   for f in input_api.AffectedSourceFiles(source_file_filter):
 157     contents = input_api.ReadFile(f, 'rb')
 158     if re.search(r'#if\s*0\s', contents):
 159       errors.append(f.LocalPath())
 160   if errors:
 161     return [output_api.PresubmitError(
 162       'Don\'t use #if '+'0; just delete the code.',
 163       items=errors)]
 164   return []
 165
 166 def FindNamespaceInBlock(pos, namespace, contents, whitelist=[]):
 167   open_brace = -1
 168   close_brace = -1
 169   quote = -1
 170   name = -1
 171   brace_count = 1
 172   quote_count = 0
 173   while pos < len(contents) and brace_count > 0:
 174     if open_brace < pos: open_brace = contents.find("{", pos)
 175     if close_brace < pos: close_brace = contents.find("}", pos)
 176     if quote < pos: quote = FindUnquotedQuote(contents, pos)
 177     if name < pos: name = contents.find(("%s::" % namespace), pos)
 178
 179     if name < 0:
 180       return False # The namespace is not used at all.
 181     if open_brace < 0:
 182       open_brace = len(contents)
 183     if close_brace < 0:
 184       close_brace = len(contents)
 185     if quote < 0:
 186       quote = len(contents)
 187
 188     next = min(open_brace, min(close_brace, min(quote, name)))
 189
 190     if next == open_brace:
 191       brace_count += 1
 192     elif next == close_brace:
 193       brace_count -= 1
 194     elif next == quote:
 195       quote_count = 0 if quote_count else 1
 196     elif next == name and not quote_count:
 197       in_whitelist = False
 198       for w in whitelist:
 199         if re.match(w, contents[next:]):
 200           in_whitelist = True
 201           break
 202       if not in_whitelist:
 203         return True
 204     pos = next + 1
 205   return False
 206
 207 # Checks for the use of cc:: within the cc namespace, which is usually
 208 # redundant.
 209 def CheckNamespace(input_api, output_api):
 210   errors = []
 211
 212   source_file_filter = lambda x: x
 213   for f in input_api.AffectedSourceFiles(source_file_filter):
 214     contents = input_api.ReadFile(f, 'rb')
 215     match = re.search(r'namespace\s*cc\s*{', contents)
 216     if match:
 217       whitelist = [
 218         r"cc::remove_if\b",
 219         ]
 220       if FindNamespaceInBlock(match.end(), 'cc', contents, whitelist=whitelist):
 221         errors.append(f.LocalPath())
 222
 223   if errors:
 224     return [output_api.PresubmitError(
 225       'Do not use cc:: inside of the cc namespace.',
 226       items=errors)]
 227   return []
 228
 229 def CheckForUseOfWrongClock(input_api,
 230                             output_api,
 231                             white_list=CC_SOURCE_FILES,
 232                             black_list=None):
 233   """Make sure new lines of code don't use a clock susceptible to skew."""
 234   black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
 235   source_file_filter = lambda x: input_api.FilterSourceFile(x,
 236                                                             white_list,
 237                                                             black_list)
 238   # Regular expression that should detect any explicit references to the
 239   # base::Time type (or base::Clock/DefaultClock), whether in using decls,
 240   # typedefs, or to call static methods.
 241   base_time_type_pattern = r'(^|\W)base::(Time|Clock|DefaultClock)(\W|$)'
 242
 243   # Regular expression that should detect references to the base::Time class
 244   # members, such as a call to base::Time::Now.
 245   base_time_member_pattern = r'(^|\W)(Time|Clock|DefaultClock)::'
 246
 247   # Regular expression to detect "using base::Time" declarations.  We want to
 248   # prevent these from triggerring a warning.  For example, it's perfectly
 249   # reasonable for code to be written like this:
 250   #
 251   #   using base::Time;
 252   #   ...
 253   #   int64 foo_us = foo_s * Time::kMicrosecondsPerSecond;
 254   using_base_time_decl_pattern = r'^\s*using\s+(::)?base::Time\s*;'
 255
 256   # Regular expression to detect references to the kXXX constants in the
 257   # base::Time class.  We want to prevent these from triggerring a warning.
 258   base_time_konstant_pattern = r'(^|\W)Time::k\w+'
 259
 260   problem_re = input_api.re.compile(
 261       r'(' + base_time_type_pattern + r')|(' + base_time_member_pattern + r')')
 262   exception_re = input_api.re.compile(
 263       r'(' + using_base_time_decl_pattern + r')|(' +
 264       base_time_konstant_pattern + r')')
 265   problems = []
 266   for f in input_api.AffectedSourceFiles(source_file_filter):
 267     for line_number, line in f.ChangedContents():
 268       if problem_re.search(line):
 269         if not exception_re.search(line):
 270           problems.append(
 271               '  %s:%d\n    %s' % (f.LocalPath(), line_number, line.strip()))
 272
 273   if problems:
 274     return [output_api.PresubmitPromptOrNotify(
 275         'You added one or more references to the base::Time class and/or one\n'
 276         'of its member functions (or base::Clock/DefaultClock). In cc code,\n'
 277         'it is most certainly incorrect! Instead use base::TimeTicks.\n\n'
 278         '\n'.join(problems))]
 279   else:
 280     return []
 281
 282 def CheckChangeOnUpload(input_api, output_api):
 283   results = []
 284   results += CheckAsserts(input_api, output_api)
 285   results += CheckStdAbs(input_api, output_api)
 286   results += CheckPassByValue(input_api, output_api)
 287   results += CheckChangeLintsClean(input_api, output_api)
 288   results += CheckTodos(input_api, output_api)
 289   results += CheckNamespace(input_api, output_api)
 290   results += CheckForUseOfWrongClock(input_api, output_api)
 291   results += FindUselessIfdefs(input_api, output_api)
 292   results += input_api.canned_checks.CheckPatchFormatted(input_api, output_api)
 293   return results
 294
 295 def GetPreferredTryMasters(project, change):
 296   return {
 297     'tryserver.blink': {
 298       'linux_blink_rel': set(['defaulttests']),
 299     },
 300     'tryserver.chromium.gpu': {
 301       'linux_gpu': set(['defaulttests']),
 302       'mac_gpu': set(['defaulttests']),
 303       'win_gpu': set(['defaulttests']),
 304     },
 305   }