Preparing v8 to use with python3 /tools

There are now less that 400 days until the end of life
of Python 2(aka _legacy_ Python) https://pythonclock.org/ .
The code compatibility check for python2 and python3
used the following tools: futurize, flake8
You can see the reports here: https://travis-ci.com/bmsdave/v8/builds

This CL was uploaded by git cl split.

Bug: v8:8594
Change-Id: I661c52a70527e8ddde841fee6d4dcba282b4a938
Reviewed-on: https://chromium-review.googlesource.com/c/1470123
Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Belozorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59675}

AUTHORS

@@ -165,6 +165,7 @@ Tiancheng "Timothy" Gu <timothygu99@gmail.com>
 Tobias Burnus <burnus@net-b.de>
 Tobias Nießen <tniessen@tnie.de>
 Ujjwal Sharma <usharma1998@gmail.com>
+Vadim Gorbachev <bmsdave@gmail.com>
 Victor Costan <costan@gmail.com>
 Vlad Burlik <vladbph@gmail.com>
 Vladimir Krivosheev <develar@gmail.com>

tools/android-run.py

@@ -35,6 +35,9 @@
 # and output special error string in case of non-zero exit code.
 # Then we parse the output of 'adb shell' and look for that error string.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 from os.path import join, dirname, abspath
 import subprocess
@@ -58,8 +61,8 @@ def Execute(cmdline):
   exit_code = process.wait()
   os.close(fd_out)
   os.close(fd_err)
-  output = file(outname).read()
-  errors = file(errname).read()
+  output = open(outname).read()
+  errors = open(errname).read()
   os.unlink(outname)
   os.unlink(errname)
   sys.stdout.write(output)

tools/avg.py

-#!/usr/bin/env python3
+#!/usr/bin/env python
+
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can
 # be found in the LICENSE file.
@@ -22,6 +23,9 @@ will output
   [10/10] [default]              : avg  22,885.80 stddev   1,941.80 ( 17,584.00 -  24,266.00) Kps
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import math
 import re

tools/bigint-tester.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import math
 import multiprocessing
@@ -294,7 +297,7 @@ def WrapRunOne(args):
   return RunOne(*args)
 def RunAll(args):
   for op in args.op:
-    for r in xrange(args.runs):
+    for r in range(args.runs):
       yield (op, args.num_inputs, args.binary)
 
 def Main():

tools/callstats.py

@@ -17,6 +17,9 @@ Commands:
 For each command, you can try ./runtime-call-stats.py help command.
 '''
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import json
 import os
@@ -46,7 +49,7 @@ def print_command(cmd_args):
     elif ' ' in arg:
       arg = "'{}'".format(arg)
     return arg
-  print " ".join(map(fix_for_printing, cmd_args))
+  print(" ".join(map(fix_for_printing, cmd_args)))
 
 
 def start_replay_server(args, sites, discard_output=True):
@@ -66,15 +69,15 @@ def start_replay_server(args, sites, discard_output=True):
       "--inject_scripts=deterministic.js,{}".format(injection),
       args.replay_wpr,
   ]
-  print "=" * 80
+  print("=" * 80)
   print_command(cmd_args)
   if discard_output:
     with open(os.devnull, 'w') as null:
       server = subprocess.Popen(cmd_args, stdout=null, stderr=null)
   else:
       server = subprocess.Popen(cmd_args)
-  print "RUNNING REPLAY SERVER: %s with PID=%s" % (args.replay_bin, server.pid)
-  print "=" * 80
+  print("RUNNING REPLAY SERVER: %s with PID=%s" % (args.replay_bin, server.pid))
+  print("=" * 80)
   return {'process': server, 'injection': injection}
 
 
@@ -85,7 +88,7 @@ def stop_replay_server(server):
 
 
 def generate_injection(f, sites, refreshes=0):
-  print >> f, """\
+  print("""\
 (function() {
   var s = window.sessionStorage.getItem("refreshCounter");
   var refreshTotal = """, refreshes, """;
@@ -127,7 +130,7 @@ def generate_injection(f, sites, refreshes=0):
   var sites =
     """, json.dumps(sites), """;
   onLoad(window.location.href);
-})();"""
+})();""", file=f)
 
 def get_chrome_flags(js_flags, user_data_dir, arg_delimiter=""):
   return [
@@ -161,9 +164,9 @@ def get_chrome_replay_flags(args, arg_delimiter=""):
     ]
 
 def run_site(site, domain, args, timeout=None):
-  print "="*80
-  print "RUNNING DOMAIN %s" % domain
-  print "="*80
+  print("="*80)
+  print("RUNNING DOMAIN %s" % domain)
+  print("="*80)
   result_template = "{domain}#{count}.txt" if args.repeat else "{domain}.txt"
   count = 0
   if timeout is None: timeout = args.timeout
@@ -196,9 +199,9 @@ def run_site(site, domain, args, timeout=None):
             "timeout", str(timeout),
             args.with_chrome
         ] + chrome_flags + [ site ]
-        print "- " * 40
+        print("- " * 40)
         print_command(cmd_args)
-        print "- " * 40
+        print("- " * 40)
         with open(result, "wt") as f:
           with open(args.log_stderr or os.devnull, 'at') as err:
             status = subprocess.call(cmd_args, stdout=f, stderr=err)
@@ -212,8 +215,8 @@ def run_site(site, domain, args, timeout=None):
         if os.path.isfile(result) and os.path.getsize(result) > 0:
           if args.print_url:
             with open(result, "at") as f:
-              print >> f
-              print >> f, "URL: {}".format(site)
+              print(file=f)
+              print("URL: {}".format(site), file=f)
           retries_since_good_run = 0
           break
         if retries_since_good_run > MAX_NOF_RETRIES:
@@ -294,7 +297,7 @@ def do_run(args):
     # Run them.
     for site, domain, count, timeout in L:
       if count is not None: domain = "{}%{}".format(domain, count)
-      print(site, domain, timeout)
+      print((site, domain, timeout))
       run_site(site, domain, args, timeout)
   finally:
     if replay_server:
@@ -459,11 +462,11 @@ def print_stats(S, args):
     def stats(s, units=""):
       conf = "{:0.1f}({:0.2f}%)".format(s['ci']['abs'], s['ci']['perc'])
       return "{:8.1f}{} +/- {:15s}".format(s['average'], units, conf)
-    print "{:>50s}  {}  {}".format(
+    print("{:>50s}  {}  {}".format(
       key,
       stats(value['time_stat'], units="ms"),
       stats(value['count_stat'])
-    )
+    ))
   # Print and calculate partial sums, if necessary.
   for i in range(low, high):
     print_entry(*L[i])
@@ -479,7 +482,7 @@ def print_stats(S, args):
         partial['count_list'][j] += v
   # Print totals, if necessary.
   if args.totals:
-    print '-' * 80
+    print('-' * 80)
     if args.limit != 0 and not args.aggregate:
       partial['time_stat'] = statistics(partial['time_list'])
       partial['count_stat'] = statistics(partial['count_list'])
@@ -500,9 +503,9 @@ def do_stats(args):
     create_total_page_stats(domains, args)
   for i, domain in enumerate(sorted(domains)):
     if len(domains) > 1:
-      if i > 0: print
-      print "{}:".format(domain)
-      print '=' * 80
+      if i > 0: print()
+      print("{}:".format(domain))
+      print('=' * 80)
     domain_stats = domains[domain]
     for key in domain_stats:
       domain_stats[key]['time_stat'] = \
@@ -575,7 +578,7 @@ def do_json(args):
           entry.append(round(s['ci']['perc'], 2))
         stats.append(entry)
       domains[domain] = stats
-  print json.dumps(versions, separators=(',', ':'))
+  print(json.dumps(versions, separators=(',', ':')))
 
 
 # Help.

tools/clusterfuzz/testdata/test_d8_1.py

@@ -2,7 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-print """
+# for py2/py3 compatibility
+from __future__ import print_function
+
+print("""
 1
 v8-foozzie source: name/to/a/file.js
 2
@@ -11,4 +14,4 @@ v8-foozzie source: name/to/file.js
         ^
 3
 unknown
-"""
+""")

tools/clusterfuzz/testdata/test_d8_2.py

@@ -2,7 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-print """
+# for py2/py3 compatibility
+from __future__ import print_function
+
+print("""
 1
 v8-foozzie source: name/to/a/file.js
 2
@@ -11,4 +14,4 @@ v8-foozzie source: name/to/file.js
 ^
 3
 unknown
-"""
+""")

tools/clusterfuzz/testdata/test_d8_3.py

@@ -2,7 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-print """
+# for py2/py3 compatibility
+from __future__ import print_function
+
+print("""
 1
 v8-foozzie source: name/to/a/file.js
 2
@@ -11,4 +14,4 @@ v8-foozzie source: name/to/file.js
 ^
 3
 not unknown
-"""
+""")

tools/clusterfuzz/v8_foozzie.py

@@ -7,6 +7,9 @@
 V8 correctness fuzzer launcher script.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import hashlib
 import itertools
@@ -227,8 +230,8 @@ def content_bailout(content, ignore_fun):
   """Print failure state and return if ignore_fun matches content."""
   bug = (ignore_fun(content) or '').strip()
   if bug:
-    print FAILURE_HEADER_TEMPLATE % dict(
-        configs='', source_key='', suppression=bug)
+    print(FAILURE_HEADER_TEMPLATE % dict(
+        configs='', source_key='', suppression=bug))
     return True
   return False
 
@@ -238,10 +241,10 @@ def pass_bailout(output, step_number):
   if output.HasTimedOut():
     # Dashed output, so that no other clusterfuzz tools can match the
     # words timeout or crash.
-    print '# V8 correctness - T-I-M-E-O-U-T %d' % step_number
+    print('# V8 correctness - T-I-M-E-O-U-T %d' % step_number)
     return True
   if output.HasCrashed():
-    print '# V8 correctness - C-R-A-S-H %d' % step_number
+    print('# V8 correctness - C-R-A-S-H %d' % step_number)
     return True
   return False
 
@@ -250,8 +253,8 @@ def fail_bailout(output, ignore_by_output_fun):
   """Print failure state and return if ignore_by_output_fun matches output."""
   bug = (ignore_by_output_fun(output.stdout) or '').strip()
   if bug:
-    print FAILURE_HEADER_TEMPLATE % dict(
-        configs='', source_key='', suppression=bug)
+    print(FAILURE_HEADER_TEMPLATE % dict(
+        configs='', source_key='', suppression=bug))
     return True
   return False
 
@@ -289,7 +292,7 @@ def main():
     if options.first_arch != options.second_arch:
       preamble.append(ARCH_MOCKS)
     args = [d8] + config_flags + preamble + [options.testcase]
-    print " ".join(args)
+    print(" ".join(args))
     if d8.endswith('.py'):
       # Wrap with python in tests.
       args = [sys.executable] + args
@@ -333,7 +336,7 @@ def main():
     # will require changes on the clusterfuzz side.
     first_config_label = '%s,%s' % (options.first_arch, options.first_config)
     second_config_label = '%s,%s' % (options.second_arch, options.second_config)
-    print (FAILURE_TEMPLATE % dict(
+    print((FAILURE_TEMPLATE % dict(
         configs='%s:%s' % (first_config_label, second_config_label),
         source_key=source_key,
         suppression='', # We can't tie bugs to differences.
@@ -347,14 +350,14 @@ def main():
             second_config_output.stdout.decode('utf-8', 'replace'),
         source=source,
         difference=difference.decode('utf-8', 'replace'),
-    )).encode('utf-8', 'replace')
+    )).encode('utf-8', 'replace'))
     return RETURN_FAIL
 
   # TODO(machenbach): Figure out if we could also return a bug in case there's
   # no difference, but one of the line suppressions has matched - and without
   # the match there would be a difference.
 
-  print '# V8 correctness - pass'
+  print('# V8 correctness - pass')
   return RETURN_PASS
 
 
@@ -364,17 +367,17 @@ if __name__ == "__main__":
   except SystemExit:
     # Make sure clusterfuzz reports internal errors and wrong usage.
     # Use one label for all internal and usage errors.
-    print FAILURE_HEADER_TEMPLATE % dict(
-        configs='', source_key='', suppression='wrong_usage')
+    print(FAILURE_HEADER_TEMPLATE % dict(
+        configs='', source_key='', suppression='wrong_usage'))
     result = RETURN_FAIL
   except MemoryError:
     # Running out of memory happens occasionally but is not actionable.
-    print '# V8 correctness - pass'
+    print('# V8 correctness - pass')
     result = RETURN_PASS
   except Exception as e:
-    print FAILURE_HEADER_TEMPLATE % dict(
-        configs='', source_key='', suppression='internal_error')
-    print '# Internal error: %s' % e
+    print(FAILURE_HEADER_TEMPLATE % dict(
+        configs='', source_key='', suppression='internal_error'))
+    print('# Internal error: %s' % e)
     traceback.print_exc(file=sys.stdout)
     result = RETURN_FAIL
 

tools/concatenate-files.py

@@ -35,6 +35,9 @@
 # on all supported build platforms, but Python is, and hence this provides
 # us with an easy and uniform way of doing this on all platforms.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import optparse
 
 
@@ -49,7 +52,7 @@ def Concatenate(filenames):
     True, if the operation was successful.
   """
   if len(filenames) < 2:
-    print "An error occurred generating %s:\nNothing to do." % filenames[-1]
+    print("An error occurred generating %s:\nNothing to do." % filenames[-1])
     return False
 
   try:
@@ -59,7 +62,7 @@ def Concatenate(filenames):
           target.write(current.read())
     return True
   except IOError as e:
-    print "An error occurred when writing %s:\n%s" % (filenames[-1], e)
+    print("An error occurred when writing %s:\n%s" % (filenames[-1], e))
     return False
 
 

tools/deprecation_stats.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 from datetime import datetime
 import re

tools/dev/gen-tags.py

@@ -15,6 +15,10 @@ The example usage is as follows:
 If no <arch> is given, it generates tags file for all arches:
     $ tools/dev/gen-tags.py
 """
+
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import subprocess
 import sys

tools/dev/v8gen.py

@@ -38,6 +38,9 @@ v8gen.py list
 -------------------------------------------------------------------------------
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import re
@@ -144,8 +147,8 @@ class GenerateGnArgs(object):
 
     # Check for builder/config in mb config.
     if self._options.builder not in self._mbw.masters[self._options.master]:
-      print '%s does not exist in %s for %s' % (
-          self._options.builder, CONFIG, self._options.master)
+      print('%s does not exist in %s for %s' % (
+          self._options.builder, CONFIG, self._options.master))
       return 1
 
     # TODO(machenbach): Check if the requested configurations has switched to
@@ -186,19 +189,19 @@ class GenerateGnArgs(object):
     return 0
 
   def cmd_list(self):
-    print '\n'.join(sorted(self._mbw.masters[self._options.master]))
+    print('\n'.join(sorted(self._mbw.masters[self._options.master])))
     return 0
 
   def verbose_print_1(self, text):
     if self._options.verbosity >= 1:
-      print '#' * 80
-      print text
+      print('#' * 80)
+      print(text)
 
   def verbose_print_2(self, text):
     if self._options.verbosity >= 2:
       indent = ' ' * 2
       for l in text.splitlines():
-        print indent + l
+        print(indent + l)
 
   def _call_cmd(self, args):
     self.verbose_print_1(' '.join(args))
@@ -290,9 +293,9 @@ class GenerateGnArgs(object):
     self._mbw.ReadConfigFile()
 
     if not self._options.master in self._mbw.masters:
-      print '%s not found in %s\n' % (self._options.master, CONFIG)
-      print 'Choose one of:\n%s\n' % (
-          '\n'.join(sorted(self._mbw.masters.keys())))
+      print('%s not found in %s\n' % (self._options.master, CONFIG))
+      print('Choose one of:\n%s\n' % (
+          '\n'.join(sorted(self._mbw.masters.keys()))))
       return 1
 
     return self._options.func()

tools/dump-cpp.py

@@ -6,6 +6,9 @@
 # This script executes dumpcpp.js, collects all dumped C++ symbols,
 # and merges them back into v8 log.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import platform
 import re
@@ -44,10 +47,10 @@ if __name__ == '__main__':
   if d8_line:
     d8_exec = d8_line.group(1)
     if not is_file_executable(d8_exec):
-      print 'd8 binary path found in {} is not executable.'.format(log_file)
+      print('d8 binary path found in {} is not executable.'.format(log_file))
       sys.exit(-1)
   else:
-    print 'No d8 binary path found in {}.'.format(log_file)
+    print('No d8 binary path found in {}.'.format(log_file))
     sys.exit(-1)
 
   args = [d8_exec] + JS_FILES + ['--'] + args
@@ -57,9 +60,9 @@ if __name__ == '__main__':
                           stdin=f)
     out, err = sp.communicate()
   if debug:
-    print err
+    print(err)
   if sp.returncode != 0:
-    print out
+    print(out)
     exit(-1)
 
   if on_windows and out:

tools/eval_gc_nvp.py

@@ -7,10 +7,14 @@
 """This script is used to analyze GCTracer's NVP output."""
 
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
+
 from argparse import ArgumentParser
 from copy import deepcopy
 from gc_nvp_common import split_nvp
-from math import ceil,log
+from math import ceil, log
 from sys import stdin
 
 

tools/find-commit-for-patch.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import subprocess
 import sys

tools/find_depot_tools.py

@@ -4,6 +4,9 @@
 """Small utility function to find depot_tools and add it to the python path.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import sys
 
@@ -36,5 +39,5 @@ def add_depot_tools_to_path():
       return i
     previous_dir = root_dir
     root_dir = os.path.dirname(root_dir)
-  print >> sys.stderr, 'Failed to find depot_tools'
+  print('Failed to find depot_tools', file=sys.stderr)
   return None

tools/gc-nvp-to-csv.py

@@ -11,20 +11,25 @@
 # Usage: gc-nvp-to-csv.py <GC-trace-filename>
 #
 
+
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 import gc_nvp_common
 
+
 def process_trace(filename):
   trace = gc_nvp_common.parse_gc_trace(filename)
   if len(trace):
     keys = trace[0].keys()
-    print ', '.join(keys)
+    print(', '.join(keys))
     for entry in trace:
-      print ', '.join(map(lambda key: str(entry[key]), keys))
+      print(', '.join(map(lambda key: str(entry[key]), keys)))
 
 
 if len(sys.argv) != 2:
-  print "Usage: %s <GC-trace-filename>" % sys.argv[0]
+  print("Usage: %s <GC-trace-filename>" % sys.argv[0])
   sys.exit(1)
 
 process_trace(sys.argv[1])

tools/gc-nvp-trace-processor.py

@@ -37,10 +37,21 @@
 #
 
 
+# for py2/py3 compatibility
 from __future__ import with_statement
+from __future__ import print_function
+from functools import reduce
+
 import sys, types, subprocess, math
 import gc_nvp_common
 
+
+try:
+  long        # Python 2
+except NameError:
+  long = int  # Python 3
+
+
 def flatten(l):
   flat = []
   for i in l: flat.extend(i)
@@ -62,7 +73,7 @@ class Item(object):
     self.title = title
     self.axis = axis
     self.props = keywords
-    if type(field) is types.ListType:
+    if type(field) is list:
       self.field = field
     else:
       self.field = [field]
@@ -135,7 +146,7 @@ def is_y2_used(plot):
 
 def get_field(trace_line, field):
   t = type(field)
-  if t is types.StringType:
+  if t is bytes:
     return trace_line[field]
   elif t is types.FunctionType:
     return field(trace_line)
@@ -177,7 +188,7 @@ def plot_all(plots, trace, prefix):
     outfilename = "%s_%d.png" % (prefix, len(charts))
     charts.append(outfilename)
     script = generate_script_and_datafile(plot, trace, '~datafile', outfilename)
-    print 'Plotting %s...' % outfilename
+    print('Plotting %s...' % outfilename)
     gnuplot(script)
 
   return charts
@@ -350,10 +361,10 @@ def process_trace(filename):
       out.write('<img src="%s">' % chart)
       out.write('</body></html>')
 
-  print "%s generated." % (filename + '.html')
+  print("%s generated." % (filename + '.html'))
 
 if len(sys.argv) != 2:
-  print "Usage: %s <GC-trace-filename>" % sys.argv[0]
+  print("Usage: %s <GC-trace-filename>" % sys.argv[0])
   sys.exit(1)
 
 process_trace(sys.argv[1])

tools/gcmole/parallel.py

@@ -20,6 +20,9 @@ ______________ file2
 ______________ finish <exit code of clang --opt file2> ______________
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import itertools
 import multiprocessing
 import subprocess
@@ -39,6 +42,6 @@ if __name__ == '__main__':
   cmdlines = ["%s %s" % (sys.argv[1], filename) for filename in sys.argv[2:]]
   for filename, result in itertools.izip(
       sys.argv[2:], pool.imap(invoke, cmdlines)):
-    print "______________ %s" % filename
-    print result[0]
-    print "______________ finish %d ______________" % result[1]
+    print("______________ %s" % filename)
+    print(result[0])
+    print("______________ finish %d ______________" % result[1])

tools/gcmole/run-gcmole.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import os.path
 import signal
@@ -19,8 +22,8 @@ BASE_PATH = os.path.dirname(os.path.dirname(GCMOLE_PATH))
 assert len(sys.argv) == 2
 
 if not os.path.isfile("out/Release/gen/torque-generated/builtin-definitions-from-dsl.h"):
-  print "Expected generated headers in out/Release/gen."
-  print "Either build v8 in out/Release or change gcmole.lua:115"
+  print("Expected generated headers in out/Release/gen.")
+  print("Either build v8 in out/Release or change gcmole.lua:115")
   sys.exit(-1)
 
 proc = subprocess.Popen(

tools/gdb-v8-support.py

@@ -25,12 +25,15 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import re
 import tempfile
 import os
 import subprocess
 import time
-
+import gdb
 
 kSmiTag = 0
 kSmiTagSize = 1

tools/gen-inlining-tests.py

-#!/usr/bin/env python3
+#!/usr/bin/env python
 
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
 
 from collections import namedtuple
 import textwrap

tools/gen-postmortem-metadata.py

@@ -46,6 +46,9 @@
 # the generated libv8 binary.
 #
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import re
 import sys
 
@@ -628,7 +631,7 @@ def emit_set(out, consts):
 # Emit the whole output file.
 #
 def emit_config():
-        out = file(sys.argv[1], 'w');
+        out = open(sys.argv[1], 'w');
 
         out.write(header);
 

tools/generate-builtins-tests.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import json
 import optparse
 import os

tools/generate-header-include-checks.py

@@ -13,6 +13,9 @@ BUILD.gn. Just compile to check whether there are any violations to the rule
 that each header must be includable in isolation.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import os.path
@@ -58,7 +61,7 @@ def parse_args():
 
 def printv(line):
   if args.verbose:
-    print line
+    print(line)
 
 
 def find_all_headers():

tools/get_landmines.py

@@ -8,6 +8,9 @@ This file emits the list of reasons why a particular build needs to be clobbered
 (or a list of 'landmines').
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 
 
@@ -21,23 +24,23 @@ def print_landmines():  # pylint: disable=invalid-name
   # dependency problems, fix the dependency problems instead of adding a
   # landmine.
   # See the Chromium version in src/build/get_landmines.py for usage examples.
-  print 'Need to clobber after ICU52 roll.'
-  print 'Landmines test.'
-  print 'Activating MSVS 2013.'
-  print 'Revert activation of MSVS 2013.'
-  print 'Activating MSVS 2013 again.'
-  print 'Clobber after ICU roll.'
-  print 'Moar clobbering...'
-  print 'Remove build/android.gypi'
-  print 'Cleanup after windows ninja switch attempt.'
-  print 'Switching to pinned msvs toolchain.'
-  print 'Clobbering to hopefully resolve problem with mksnapshot'
-  print 'Clobber after ICU roll.'
-  print 'Clobber after Android NDK update.'
-  print 'Clober to fix windows build problems.'
-  print 'Clober again to fix windows build problems.'
-  print 'Clobber to possibly resolve failure on win-32 bot.'
-  print 'Clobber for http://crbug.com/668958.'
+  print('Need to clobber after ICU52 roll.')
+  print('Landmines test.')
+  print('Activating MSVS 2013.')
+  print('Revert activation of MSVS 2013.')
+  print('Activating MSVS 2013 again.')
+  print('Clobber after ICU roll.')
+  print('Moar clobbering...')
+  print('Remove build/android.gypi')
+  print('Cleanup after windows ninja switch attempt.')
+  print('Switching to pinned msvs toolchain.')
+  print('Clobbering to hopefully resolve problem with mksnapshot')
+  print('Clobber after ICU roll.')
+  print('Clobber after Android NDK update.')
+  print('Clober to fix windows build problems.')
+  print('Clober again to fix windows build problems.')
+  print('Clobber to possibly resolve failure on win-32 bot.')
+  print('Clobber for http://crbug.com/668958.')
   return 0
 
 

tools/ignition/bytecode_dispatches_report.py

@@ -5,6 +5,9 @@
 # found in the LICENSE file.
 #
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import heapq
 import json
@@ -54,8 +57,8 @@ def warn_if_counter_may_have_saturated(dispatches_table):
   for source, counters_from_source in iteritems(dispatches_table):
     for destination, counter in iteritems(counters_from_source):
       if counter == __COUNTER_MAX:
-        print "WARNING: {} -> {} may have saturated.".format(source,
-                                                             destination)
+        print("WARNING: {} -> {} may have saturated.".format(source,
+                                                             destination))
 
 
 def find_top_bytecode_dispatch_pairs(dispatches_table, top_count):
@@ -71,9 +74,9 @@ def find_top_bytecode_dispatch_pairs(dispatches_table, top_count):
 def print_top_bytecode_dispatch_pairs(dispatches_table, top_count):
   top_bytecode_dispatch_pairs = (
     find_top_bytecode_dispatch_pairs(dispatches_table, top_count))
-  print "Top {} bytecode dispatch pairs:".format(top_count)
+  print("Top {} bytecode dispatch pairs:".format(top_count))
   for source, destination, counter in top_bytecode_dispatch_pairs:
-    print "{:>12d}\t{} -> {}".format(counter, source, destination)
+    print("{:>12d}\t{} -> {}".format(counter, source, destination))
 
 
 def find_top_bytecodes(dispatches_table):
@@ -87,9 +90,9 @@ def find_top_bytecodes(dispatches_table):
 
 def print_top_bytecodes(dispatches_table):
   top_bytecodes = find_top_bytecodes(dispatches_table)
-  print "Top bytecodes:"
+  print("Top bytecodes:")
   for bytecode, counter in top_bytecodes:
-    print "{:>12d}\t{}".format(counter, bytecode)
+    print("{:>12d}\t{}".format(counter, bytecode))
 
 
 def find_top_dispatch_sources_and_destinations(
@@ -116,13 +119,13 @@ def print_top_dispatch_sources_and_destinations(dispatches_table, bytecode,
                                                 top_count, sort_relative):
   top_sources, top_destinations = find_top_dispatch_sources_and_destinations(
       dispatches_table, bytecode, top_count, sort_relative)
-  print "Top sources of dispatches to {}:".format(bytecode)
+  print("Top sources of dispatches to {}:".format(bytecode))
   for source_name, counter, ratio in top_sources:
-    print "{:>12d}\t{:>5.1f}%\t{}".format(counter, ratio * 100, source_name)
+    print("{:>12d}\t{:>5.1f}%\t{}".format(counter, ratio * 100, source_name))
 
-  print "\nTop destinations of dispatches from {}:".format(bytecode)
+  print("\nTop destinations of dispatches from {}:".format(bytecode))
   for destination_name, counter, ratio in top_destinations:
-    print "{:>12d}\t{:>5.1f}%\t{}".format(counter, ratio * 100, destination_name)
+    print("{:>12d}\t{:>5.1f}%\t{}".format(counter, ratio * 100, destination_name))
 
 
 def build_counters_matrix(dispatches_table):

tools/ignition/linux_perf_bytecode_annotate.py

-#! /usr/bin/python2
+#! /usr/bin/python
 #
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 #
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import collections
 import os
@@ -94,18 +97,18 @@ def print_disassembly_annotation(offset_counts, bytecode_disassembly):
     return offsets.pop() if offsets else -1
 
   current_offset = next_offset()
-  print current_offset;
+  print(current_offset);
 
   for line in bytecode_disassembly:
     disassembly_offset = int(line.split()[1])
     if disassembly_offset == current_offset:
       count = offset_counts[current_offset]
       percentage = 100.0 * count / total
-      print "{:>8d} ({:>5.1f}%) ".format(count, percentage),
+      print("{:>8d} ({:>5.1f}%) ".format(count, percentage), end=' ')
       current_offset = next_offset()
     else:
-      print "                ",
-    print line
+      print("                ", end=' ')
+    print(line)
 
   if offsets:
     print ("WARNING: Offsets not empty. Output is most likely invalid due to "

tools/js2c.py

@@ -31,6 +31,9 @@
 # char arrays. It is used for embedded JavaScript code in the V8
 # library.
 
+# for py2/py3 compatibility
+from functools import reduce
+
 import os, re
 import optparse
 import textwrap
@@ -249,7 +252,7 @@ def BuildMetadata(sources, source_bytes, native_type):
   get_script_name_cases = []
   get_script_source_cases = []
   offset = 0
-  for i in xrange(len(sources.modules)):
+  for i in range(len(sources.modules)):
     native_name = "native %s.js" % sources.names[i]
     d = {
         "i": i,
@@ -290,7 +293,7 @@ def PutInt(blob_file, value):
   value_with_length = (value << 2) | (size - 1)
 
   byte_sequence = bytearray()
-  for i in xrange(size):
+  for i in range(size):
     byte_sequence.append(value_with_length & 255)
     value_with_length >>= 8;
   blob_file.write(byte_sequence)
@@ -312,7 +315,7 @@ def WriteStartupBlob(sources, startup_blob):
   output = open(startup_blob, "wb")
 
   PutInt(output, len(sources.names))
-  for i in xrange(len(sources.names)):
+  for i in range(len(sources.names)):
     PutStr(output, sources.names[i]);
     PutStr(output, sources.modules[i]);
 

tools/ll_prof.py

@@ -27,6 +27,10 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import bisect
 import collections
 import ctypes
@@ -157,7 +161,7 @@ class Code(object):
     # Print annotated lines.
     address = lines[0][0]
     total_count = 0
-    for i in xrange(len(lines)):
+    for i in range(len(lines)):
       start_offset = lines[i][0] - address
       if i == len(lines) - 1:
         end_offset = self.end_address - self.start_address
@@ -183,10 +187,10 @@ class Code(object):
         # 6 for the percentage number, incl. the '.'
         # 1 for the '%' sign
         # => 15
-        print "%5d | %6.2f%% %x(%d): %s" % (count, percent, offset, offset, lines[i][1])
+        print("%5d | %6.2f%% %x(%d): %s" % (count, percent, offset, offset, lines[i][1]))
       else:
-        print "%s %x(%d): %s" % (" " * 15, offset, offset, lines[i][1])
-    print
+        print("%s %x(%d): %s" % (" " * 15, offset, offset, lines[i][1]))
+    print()
     assert total_count == self.self_ticks, \
         "Lost ticks (%d != %d) in %s" % (total_count, self.self_ticks, self)
 
@@ -267,9 +271,8 @@ class CodeMap(object):
     pages = 0
     while page_id < limit_id:
       if max_pages >= 0 and pages > max_pages:
-        print >>sys.stderr, \
-            "Warning: page limit (%d) reached for %s [%s]" % (
-            max_pages, code.name, code.origin)
+        print("Warning: page limit (%d) reached for %s [%s]" % (
+            max_pages, code.name, code.origin), file=sys.stderr)
         break
       if page_id in self.pages:
         page = self.pages[page_id]
@@ -309,7 +312,7 @@ class CodeMap(object):
 
   def Print(self):
     for code in self.AllCode():
-      print code
+      print(code)
 
   def Find(self, pc):
     if pc < self.min_address or pc >= self.max_address:
@@ -411,7 +414,7 @@ class LogReader(object):
           continue
         code = self.code_map.Find(old_start_address)
         if not code:
-          print >>sys.stderr, "Warning: Not found %x" % old_start_address
+          print("Warning: Not found %x" % old_start_address, file=sys.stderr)
           continue
         assert code.start_address == old_start_address, \
             "Inexact move address %x for %s" % (old_start_address, code)
@@ -591,7 +594,7 @@ class TraceReader(object):
     self.trace = mmap.mmap(self.trace_file.fileno(), 0, mmap.MAP_PRIVATE)
     self.trace_header = TRACE_HEADER_DESC.Read(self.trace, 0)
     if self.trace_header.magic != TraceReader._TRACE_HEADER_MAGIC:
-      print >>sys.stderr, "Warning: unsupported trace header magic"
+      print("Warning: unsupported trace header magic", file=sys.stderr)
     self.offset = self.trace_header.data_offset
     self.limit = self.trace_header.data_offset + self.trace_header.data_size
     assert self.limit <= self.trace.size(), \
@@ -642,7 +645,7 @@ class TraceReader(object):
       return sample
     sample.ips = []
     offset += self.header_size + ctypes.sizeof(sample)
-    for _ in xrange(sample.nr):
+    for _ in range(sample.nr):
       sample.ips.append(
         self.ip_struct.from_buffer(self.trace, offset).value)
       offset += self.ip_size
@@ -786,7 +789,7 @@ class LibraryRepo(object):
 
   def _LoadKernelSymbols(self, code_map):
     if not os.path.exists(KERNEL_ALLSYMS_FILE):
-      print >>sys.stderr, "Warning: %s not found" % KERNEL_ALLSYMS_FILE
+      print("Warning: %s not found" % KERNEL_ALLSYMS_FILE, file=sys.stderr)
       return False
     kallsyms = open(KERNEL_ALLSYMS_FILE, "r")
     code = None
@@ -804,35 +807,35 @@ class LibraryRepo(object):
 
 
 def PrintReport(code_map, library_repo, arch, ticks, options):
-  print "Ticks per symbol:"
+  print("Ticks per symbol:")
   used_code = [code for code in code_map.UsedCode()]
   used_code.sort(key=lambda x: x.self_ticks, reverse=True)
   for i, code in enumerate(used_code):
     code_ticks = code.self_ticks
-    print "%10d %5.1f%% %s [%s]" % (code_ticks, 100. * code_ticks / ticks,
-                                    code.FullName(), code.origin)
+    print("%10d %5.1f%% %s [%s]" % (code_ticks, 100. * code_ticks / ticks,
+                                    code.FullName(), code.origin))
     if options.disasm_all or i < options.disasm_top:
       code.PrintAnnotated(arch, options)
-  print
-  print "Ticks per library:"
+  print()
+  print("Ticks per library:")
   mmap_infos = [m for m in library_repo.infos if m.ticks > 0]
   mmap_infos.sort(key=lambda m: m.ticks, reverse=True)
   for mmap_info in mmap_infos:
     mmap_ticks = mmap_info.ticks
-    print "%10d %5.1f%% %s" % (mmap_ticks, 100. * mmap_ticks / ticks,
-                               mmap_info.unique_name)
+    print("%10d %5.1f%% %s" % (mmap_ticks, 100. * mmap_ticks / ticks,
+                               mmap_info.unique_name))
 
 
 def PrintDot(code_map, options):
-  print "digraph G {"
+  print("digraph G {")
   for code in code_map.UsedCode():
     if code.self_ticks < 10:
       continue
-    print "n%d [shape=box,label=\"%s\"];" % (code.id, code.name)
+    print("n%d [shape=box,label=\"%s\"];" % (code.id, code.name))
     if code.callee_ticks:
       for callee, ticks in code.callee_ticks.iteritems():
-        print "n%d -> n%d [label=\"%d\"];" % (code.id, callee.id, ticks)
-  print "}"
+        print("n%d -> n%d [label=\"%d\"];" % (code.id, callee.id, ticks))
+  print("}")
 
 
 if __name__ == "__main__":
@@ -877,8 +880,8 @@ if __name__ == "__main__":
   options, args = parser.parse_args()
 
   if not options.quiet:
-    print "V8 log: %s, %s.ll" % (options.log, options.log)
-    print "Perf trace file: %s" % options.trace
+    print("V8 log: %s, %s.ll" % (options.log, options.log))
+    print("Perf trace file: %s" % options.trace)
 
   V8_GC_FAKE_MMAP = options.gc_fake_mmap
   HOST_ROOT = options.host_root
@@ -886,7 +889,7 @@ if __name__ == "__main__":
     disasm.OBJDUMP_BIN = options.objdump
     OBJDUMP_BIN = options.objdump
   else:
-    print "Cannot find %s, falling back to default objdump" % options.objdump
+    print("Cannot find %s, falling back to default objdump" % options.objdump)
 
   # Stats.
   events = 0
@@ -904,8 +907,8 @@ if __name__ == "__main__":
   log_reader = LogReader(log_name=options.log + ".ll",
                          code_map=code_map)
   if not options.quiet:
-    print "Generated code architecture: %s" % log_reader.arch
-    print
+    print("Generated code architecture: %s" % log_reader.arch)
+    print()
     sys.stdout.flush()
 
   # Process the code and trace logs.
@@ -968,11 +971,11 @@ if __name__ == "__main__":
       def PrintTicks(number, total, description):
         print("%10d %5.1f%% ticks in %s" %
               (number, 100.0*number/total, description))
-      print
-      print "Stats:"
-      print "%10d total trace events" % events
-      print "%10d total ticks" % ticks
-      print "%10d ticks not in symbols" % missed_ticks
+      print()
+      print("Stats:")
+      print("%10d total trace events" % events)
+      print("%10d total ticks" % ticks)
+      print("%10d ticks not in symbols" % missed_ticks)
       unaccounted = "unaccounted ticks"
       if really_missed_ticks > 0:
         unaccounted += " (probably in the kernel, try --kernel)"
@@ -980,10 +983,10 @@ if __name__ == "__main__":
       PrintTicks(optimized_ticks, ticks, "ticks in optimized code")
       PrintTicks(generated_ticks, ticks, "ticks in other lazily compiled code")
       PrintTicks(v8_internal_ticks, ticks, "ticks in v8::internal::*")
-      print "%10d total symbols" % len([c for c in code_map.AllCode()])
-      print "%10d used symbols" % len([c for c in code_map.UsedCode()])
-      print "%9.2fs library processing time" % mmap_time
-      print "%9.2fs tick processing time" % sample_time
+      print("%10d total symbols" % len([c for c in code_map.AllCode()]))
+      print("%10d used symbols" % len([c for c in code_map.UsedCode()]))
+      print("%9.2fs library processing time" % mmap_time)
+      print("%9.2fs tick processing time" % sample_time)
 
   log_reader.Dispose()
   trace_reader.Dispose()

tools/lldb_commands.py

@@ -5,6 +5,9 @@
 # Load this file by adding this to your ~/.lldbinit:
 # command script import <this_dir>/lldb_commands.py
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import lldb
 import re
 

tools/locs.py

-#!/usr/bin/env python3
+#!/usr/bin/env python
+
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -7,6 +8,9 @@
   Consult --help for more information.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import json
 import os

tools/mb/mb.py

@@ -10,6 +10,7 @@ MB is a wrapper script for GN that can be used to generate build files
 for sets of canned configurations and analyze them.
 """
 
+# for py2/py3 compatibility
 from __future__ import print_function
 
 import argparse
@@ -36,6 +37,12 @@ sys.path = [os.path.join(CHROMIUM_SRC_DIR, 'build')] + sys.path
 
 import gn_helpers
 
+try:
+  cmp              # Python 2
+except NameError:  # Python 3
+  def cmp(x, y):   # pylint: disable=redefined-builtin
+    return (x > y) - (x < y)
+
 
 def main(args):
   mbw = MetaBuildWrapper()
@@ -1155,7 +1162,7 @@ class MetaBuildWrapper(object):
   def MaybeMakeDirectory(self, path):
     try:
       os.makedirs(path)
-    except OSError, e:
+    except OSError as e:
       if e.errno != errno.EEXIST:
         raise
 

tools/mb/mb_unittest.py

@@ -284,7 +284,7 @@ class UnitTest(unittest.TestCase):
     self.assertEqual(['all', 'foo_unittests'], out['compile_targets'])
 
   def test_analyze_handles_way_too_many_results(self):
-    too_many_files = ', '.join(['"//foo:foo%d"' % i for i in xrange(4 * 1024)])
+    too_many_files = ', '.join(['"//foo:foo%d"' % i for i in range(4 * 1024)])
     files = {'/tmp/in.json': '''{\
                "files": ["foo/foo_unittest.cc"],
                "test_targets": ["foo_unittests"],

tools/node/fetch_deps.py

@@ -9,6 +9,9 @@ Use this script to fetch all dependencies for V8 to run build_gn.py.
 Usage: fetch_deps.py <v8-path>
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import subprocess
 import sys
@@ -52,9 +55,9 @@ def EnsureGit(v8_path):
   expected_git_dir = os.path.join(v8_path, ".git")
   actual_git_dir = git("rev-parse --absolute-git-dir")
   if expected_git_dir == actual_git_dir:
-    print "V8 is tracked stand-alone by git."
+    print("V8 is tracked stand-alone by git.")
     return False
-  print "Initializing temporary git repository in v8."
+  print("Initializing temporary git repository in v8.")
   git("init")
   git("config user.name \"Ada Lovelace\"")
   git("config user.email ada@lovela.ce")
@@ -71,7 +74,7 @@ def FetchDeps(v8_path):
 
   temporary_git = EnsureGit(v8_path)
   try:
-    print "Fetching dependencies."
+    print("Fetching dependencies.")
     env = os.environ.copy()
     # gclient needs to have depot_tools in the PATH.
     env["PATH"] = depot_tools + os.pathsep + env["PATH"]

tools/node/node_common.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import pipes
 import shutil
@@ -23,7 +26,7 @@ def EnsureDepotTools(v8_path, fetch_if_not_exist):
     except:
       pass
     if fetch_if_not_exist:
-      print "Checking out depot_tools."
+      print("Checking out depot_tools.")
       # shell=True needed on Windows to resolve git.bat.
       subprocess.check_call("git clone {} {}".format(
           pipes.quote(DEPOT_TOOLS_URL),
@@ -36,14 +39,14 @@ def EnsureDepotTools(v8_path, fetch_if_not_exist):
     return None
   depot_tools = _Get(v8_path)
   assert depot_tools is not None
-  print "Using depot tools in %s" % depot_tools
+  print("Using depot tools in %s" % depot_tools)
   return depot_tools
 
 def UninitGit(v8_path):
-  print "Uninitializing temporary git repository"
+  print("Uninitializing temporary git repository")
   target = os.path.join(v8_path, ".git")
   if os.path.isdir(target):
-    print ">> Cleaning up %s" % target
+    print(">> Cleaning up %s" % target)
     def OnRmError(func, path, exec_info):
       # This might happen on Windows
       os.chmod(path, stat.S_IWRITE)

tools/node/update_node.py

@@ -23,6 +23,9 @@ Optional flags:
   --with-patch  Also include currently staged files in the V8 checkout.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import shutil
@@ -57,7 +60,7 @@ FILES_TO_KEEP = [ "gypfiles" ]
 
 def RunGclient(path):
   assert os.path.isdir(path)
-  print ">> Running gclient sync"
+  print(">> Running gclient sync")
   subprocess.check_call(["gclient", "sync", "--nohooks"], cwd=path)
 
 def CommitPatch(options):
@@ -67,7 +70,7 @@ def CommitPatch(options):
   the fake git clone fetch it into node.js. We can leave the commit, as
   bot_update will ensure a clean state on each run.
   """
-  print ">> Committing patch"
+  print(">> Committing patch")
   subprocess.check_call(
       ["git", "-c", "user.name=fake", "-c", "user.email=fake@chromium.org",
        "commit", "--allow-empty", "-m", "placeholder-commit"],
@@ -77,8 +80,8 @@ def CommitPatch(options):
 def UpdateTarget(repository, options, files_to_keep):
   source = os.path.join(options.v8_path, *repository)
   target = os.path.join(options.node_path, TARGET_SUBDIR, *repository)
-  print ">> Updating target directory %s" % target
-  print ">>     from active branch at %s" % source
+  print(">> Updating target directory %s" % target)
+  print(">>     from active branch at %s" % source)
   if not os.path.exists(target):
     os.makedirs(target)
   # Remove possible remnants of previous incomplete runs.
@@ -111,17 +114,17 @@ def UpdateTarget(repository, options, files_to_keep):
 def UpdateGitIgnore(options):
   file_name = os.path.join(options.node_path, TARGET_SUBDIR, ".gitignore")
   assert os.path.isfile(file_name)
-  print ">> Updating .gitignore with lines"
+  print(">> Updating .gitignore with lines")
   with open(file_name) as gitignore:
     content = gitignore.readlines()
   content = [x.strip() for x in content]
   for x in DELETE_FROM_GITIGNORE:
     if x in content:
-      print "- %s" % x
+      print("- %s" % x)
       content.remove(x)
   for x in ADD_TO_GITIGNORE:
     if x not in content:
-      print "+ %s" % x
+      print("+ %s" % x)
       content.append(x)
   content.sort(key=lambda x: x[1:] if x.startswith("!") else x)
   with open(file_name, "w") as gitignore:
@@ -129,7 +132,7 @@ def UpdateGitIgnore(options):
       gitignore.write("%s\n" % x)
 
 def CreateCommit(options):
-  print ">> Creating commit."
+  print(">> Creating commit.")
   # Find git hash from source.
   githash = subprocess.check_output(["git", "rev-parse", "--short", "HEAD"],
                                     cwd=options.v8_path).strip()

tools/perf-compare.py

@@ -11,6 +11,9 @@ Examples:
   %prog -t "x64 results" ../result.json master.json -o results.html
 '''
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 from collections import OrderedDict
 import json
 import math
@@ -418,7 +421,7 @@ def Render(args):
       run_names[run_name] = 0
 
       for error in data["errors"]:
-        print "Error:", error
+        print("Error:", error)
 
       for trace in data["traces"]:
         suite_name = trace["graphs"][0]

tools/predictable_wrapper.py

@@ -14,11 +14,16 @@ The command is run up to three times and the printed allocation hash is
 compared. Differences are reported as errors.
 """
 
+
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 
 from testrunner.local import command
 from testrunner.local import utils
 
+
 MAX_TRIES = 3
 TIMEOUT = 120
 
@@ -36,19 +41,19 @@ def main(args):
 
   previous_allocations = None
   for run in range(1, MAX_TRIES + 1):
-    print '### Predictable run #%d' % run
+    print('### Predictable run #%d' % run)
     output = cmd.execute()
     if output.stdout:
-      print '### Stdout:'
-      print output.stdout
+      print('### Stdout:')
+      print(output.stdout)
     if output.stderr:
-      print '### Stderr:'
-      print output.stderr
-    print '### Return code: %s' % output.exit_code
+      print('### Stderr:')
+      print(output.stderr)
+    print('### Return code: %s' % output.exit_code)
     if output.HasTimedOut():
       # If we get a timeout in any run, we are in an unpredictable state. Just
       # report it as a failure and don't rerun.
-      print '### Test timed out'
+      print('### Test timed out')
       return 1
     allocations = allocation_str(output.stdout)
     if not allocations:
@@ -57,7 +62,7 @@ def main(args):
              '--verify-predictable is passed at the cmd line.')
       return 2
     if previous_allocations and previous_allocations != allocations:
-      print '### Allocations differ'
+      print('### Allocations differ')
       return 3
     if run >= MAX_TRIES:
       # No difference on the last run -> report a success.

tools/release/auto_push.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import json
 import os
@@ -63,7 +66,7 @@ class LastReleaseBailout(Step):
         format="%H", git_hash="%s..%s" % (last_release, self["candidate"]))
 
     if not commits:
-      print "Already pushed current candidate %s" % self["candidate"]
+      print("Already pushed current candidate %s" % self["candidate"])
       return True
 
 
@@ -71,7 +74,7 @@ class CreateRelease(Step):
   MESSAGE = "Creating release if specified."
 
   def RunStep(self):
-    print "Creating release for %s." % self["candidate"]
+    print("Creating release for %s." % self["candidate"])
 
     args = [
       "--author", self._options.author,
@@ -96,7 +99,7 @@ class AutoPush(ScriptsBase):
 
   def _ProcessOptions(self, options):
     if not options.author or not options.reviewer:  # pragma: no cover
-      print "You need to specify author and reviewer."
+      print("You need to specify author and reviewer.")
       return False
     options.requires_editor = False
     return True

tools/release/auto_roll.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import sys
@@ -160,9 +163,9 @@ class UploadCL(Step):
                      cq=self._options.use_commit_queue,
                      cq_dry_run=self._options.use_dry_run,
                      cwd=cwd)
-      print "CL uploaded."
+      print("CL uploaded.")
     else:
-      print "Dry run - don't upload."
+      print("Dry run - don't upload.")
 
     self.GitCheckout("master", cwd=cwd)
     self.GitDeleteBranch("work-branch", cwd=cwd)
@@ -205,7 +208,7 @@ class AutoRoll(ScriptsBase):
 
   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.author or not options.reviewer:
-      print "A reviewer (-r) and an author (-a) are required."
+      print("A reviewer (-r) and an author (-a) are required.")
       return False
 
     options.requires_editor = False

tools/release/auto_tag.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import sys
 
@@ -15,7 +18,7 @@ class Preparation(Step):
   def RunStep(self):
     # TODO(machenbach): Remove after the git switch.
     if self.Config("PERSISTFILE_BASENAME") == "/tmp/v8-auto-tag-tempfile":
-      print "This script is disabled until after the v8 git migration."
+      print("This script is disabled until after the v8 git migration.")
       return True
 
     self.CommonPrepare()
@@ -80,7 +83,7 @@ class GetOldestUntaggedVersion(Step):
         self["candidate_version"] = version
 
     if not self["candidate"] or not self["candidate_version"]:
-      print "Nothing found to tag."
+      print("Nothing found to tag.")
       self.CommonCleanup()
       return True
 
@@ -120,18 +123,18 @@ class CalculateTagRevision(Step):
       # Don't include the version change commit itself if there is no upper
       # limit yet.
       candidate_svn =  str(int(candidate_svn) + 1)
-      next_svn = sys.maxint
+      next_svn = sys.maxsize
     lkgr_svn = self.LastLKGR(candidate_svn, next_svn)
 
     if not lkgr_svn:
-      print "There is no lkgr since the candidate version yet."
+      print("There is no lkgr since the candidate version yet.")
       self.CommonCleanup()
       return True
 
     # Let's check if the lkgr is at least three hours old.
     self["lkgr"] = self.vc.SvnGit(lkgr_svn)
     if not self["lkgr"]:
-      print "Couldn't find git hash for lkgr %s" % lkgr_svn
+      print("Couldn't find git hash for lkgr %s" % lkgr_svn)
       self.CommonCleanup()
       return True
 
@@ -139,11 +142,11 @@ class CalculateTagRevision(Step):
     current_utc_time = self._side_effect_handler.GetUTCStamp()
 
     if current_utc_time < lkgr_utc_time + 10800:
-      print "Candidate lkgr %s is too recent for tagging." % lkgr_svn
+      print("Candidate lkgr %s is too recent for tagging." % lkgr_svn)
       self.CommonCleanup()
       return True
 
-    print "Tagging revision %s with %s" % (lkgr_svn, self["candidate_version"])
+    print("Tagging revision %s with %s" % (lkgr_svn, self["candidate_version"]))
 
 
 class MakeTag(Step):
@@ -172,7 +175,7 @@ class AutoTag(ScriptsBase):
 
   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.dry_run and not options.author:
-      print "Specify your chromium.org email with -a"
+      print("Specify your chromium.org email with -a")
       return False
     options.wait_for_lgtm = False
     options.force_readline_defaults = True

tools/release/check_clusterfuzz.py

@@ -13,6 +13,8 @@ written to public logs. Public automated callers of this script should
 suppress stdout and stderr and only process contents of the results_file.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
 
 import argparse
 import httplib
@@ -222,7 +224,7 @@ def Main():
     with open(options.results_file, "w") as f:
       f.write(json.dumps(results))
   else:
-    print results
+    print(results)
 
 
 if __name__ == "__main__":

tools/release/common_includes.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import datetime
 import httplib
@@ -199,8 +202,8 @@ def Command(cmd, args="", prefix="", pipe=True, cwd=None):
   cwd = cwd or os.getcwd()
   # TODO(machenbach): Use timeout.
   cmd_line = "%s %s %s" % (prefix, cmd, args)
-  print "Command: %s" % cmd_line
-  print "in %s" % cwd
+  print("Command: %s" % cmd_line)
+  print("in %s" % cwd)
   sys.stdout.flush()
   try:
     if pipe:
@@ -272,8 +275,8 @@ class SideEffectHandler(object):  # pragma: no cover
     try:
       return json.loads(data)
     except:
-      print data
-      print "ERROR: Could not read response. Is your key valid?"
+      print(data)
+      print("ERROR: Could not read response. Is your key valid?")
       raise
 
   def Sleep(self, seconds):
@@ -448,7 +451,7 @@ class Step(GitRecipesMixin):
     if not self._state and os.path.exists(state_file):
       self._state.update(json.loads(FileToText(state_file)))
 
-    print ">>> Step %d: %s" % (self._number, self._text)
+    print(">>> Step %d: %s" % (self._number, self._text))
     try:
       return self.RunStep()
     finally:
@@ -484,16 +487,16 @@ class Step(GitRecipesMixin):
           raise Exception("Retried too often. Giving up. Reason: %s" %
                           str(got_exception))
         wait_time = wait_plan.pop()
-        print "Waiting for %f seconds." % wait_time
+        print("Waiting for %f seconds." % wait_time)
         self._side_effect_handler.Sleep(wait_time)
-        print "Retrying..."
+        print("Retrying...")
       else:
         return result
 
   def ReadLine(self, default=None):
     # Don't prompt in forced mode.
     if self._options.force_readline_defaults and default is not None:
-      print "%s (forced)" % default
+      print("%s (forced)" % default)
       return default
     else:
       return self._side_effect_handler.ReadLine()
@@ -529,8 +532,8 @@ class Step(GitRecipesMixin):
 
   def Die(self, msg=""):
     if msg != "":
-      print "Error: %s" % msg
-    print "Exiting"
+      print("Error: %s" % msg)
+    print("Exiting")
     raise Exception(msg)
 
   def DieNoManualMode(self, msg=""):
@@ -539,7 +542,7 @@ class Step(GitRecipesMixin):
       self.Die(msg)
 
   def Confirm(self, msg):
-    print "%s [Y/n] " % msg,
+    print("%s [Y/n] " % msg, end=' ')
     answer = self.ReadLine(default="Y")
     return answer == "" or answer == "Y" or answer == "y"
 
@@ -549,7 +552,7 @@ class Step(GitRecipesMixin):
         msg = "Branch %s exists, do you want to delete it?" % name
         if self.Confirm(msg):
           self.GitDeleteBranch(name, cwd=cwd)
-          print "Branch %s deleted." % name
+          print("Branch %s deleted." % name)
         else:
           msg = "Can't continue. Please delete branch %s and try again." % name
           self.Die(msg)
@@ -612,10 +615,10 @@ class Step(GitRecipesMixin):
            "change the headline of the uploaded CL.")
     answer = ""
     while answer != "LGTM":
-      print "> ",
+      print("> ", end=' ')
       answer = self.ReadLine(None if self._options.wait_for_lgtm else "LGTM")
       if answer != "LGTM":
-        print "That was not 'LGTM'."
+        print("That was not 'LGTM'.")
 
   def WaitForResolvingConflicts(self, patch_file):
     print("Applying the patch \"%s\" failed. Either type \"ABORT<Return>\", "
@@ -627,8 +630,8 @@ class Step(GitRecipesMixin):
       if answer == "ABORT":
         self.Die("Applying the patch failed.")
       if answer != "":
-        print "That was not 'RESOLVED' or 'ABORT'."
-      print "> ",
+        print("That was not 'RESOLVED' or 'ABORT'.")
+      print("> ", end=' ')
       answer = self.ReadLine()
 
   # Takes a file containing the patch to apply as first argument.
@@ -769,16 +772,18 @@ class UploadStep(Step):
   def RunStep(self):
     reviewer = None
     if self._options.reviewer:
-      print "Using account %s for review." % self._options.reviewer
+      print("Using account %s for review." % self._options.reviewer)
       reviewer = self._options.reviewer
 
     tbr_reviewer = None
     if self._options.tbr_reviewer:
-      print "Using account %s for TBR review." % self._options.tbr_reviewer
+      print("Using account %s for TBR review." % self._options.tbr_reviewer)
       tbr_reviewer = self._options.tbr_reviewer
 
     if not reviewer and not tbr_reviewer:
-      print "Please enter the email address of a V8 reviewer for your patch: ",
+      print(
+        "Please enter the email address of a V8 reviewer for your patch: ",
+        end=' ')
       self.DieNoManualMode("A reviewer must be specified in forced mode.")
       reviewer = self.ReadLine()
 
@@ -854,7 +859,7 @@ class ScriptsBase(object):
 
     # Process common options.
     if options.step < 0:  # pragma: no cover
-      print "Bad step number %d" % options.step
+      print("Bad step number %d" % options.step)
       parser.print_help()
       return None
 

tools/release/create_release.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import sys
@@ -27,7 +30,7 @@ class PrepareBranchRevision(Step):
     self["push_hash"] = (self._options.revision or
                          self.GitLog(n=1, format="%H", branch="origin/master"))
     assert self["push_hash"]
-    print "Release revision %s" % self["push_hash"]
+    print("Release revision %s" % self["push_hash"])
 
 
 class IncrementVersion(Step):
@@ -138,7 +141,7 @@ class PushBranchRef(Step):
   def RunStep(self):
     cmd = "push origin %s:refs/heads/%s" % (self["push_hash"], self["version"])
     if self._options.dry_run:
-      print "Dry run. Command:\ngit %s" % cmd
+      print("Dry run. Command:\ngit %s" % cmd)
     else:
       self.Git(cmd)
 
@@ -216,7 +219,7 @@ class LandBranch(Step):
 
   def RunStep(self):
     if self._options.dry_run:
-      print "Dry run - upload CL."
+      print("Dry run - upload CL.")
     else:
       self.GitUpload(force=True,
                      bypass_hooks=True,
@@ -224,7 +227,7 @@ class LandBranch(Step):
                      message_file=self.Config("COMMITMSG_FILE"))
     cmd = "cl land --bypass-hooks -f"
     if self._options.dry_run:
-      print "Dry run. Command:\ngit %s" % cmd
+      print("Dry run. Command:\ngit %s" % cmd)
     else:
       self.Git(cmd)
 
@@ -270,7 +273,7 @@ class CreateRelease(ScriptsBase):
 
   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.author or not options.reviewer:
-      print "Reviewer (-r) and author (-a) are required."
+      print("Reviewer (-r) and author (-a) are required.")
       return False
     return True
 

tools/release/merge_to_branch.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 from collections import OrderedDict
 import sys
@@ -186,10 +189,10 @@ class CleanUp(Step):
 
   def RunStep(self):
     self.CommonCleanup()
-    print "*** SUMMARY ***"
-    print "branch: %s" % self["merge_to_branch"]
+    print("*** SUMMARY ***")
+    print("branch: %s" % self["merge_to_branch"])
     if self["revision_list"]:
-      print "patches: %s" % self["revision_list"]
+      print("patches: %s" % self["revision_list"])
 
 
 class MergeToBranch(ScriptsBase):
@@ -215,10 +218,10 @@ class MergeToBranch(ScriptsBase):
   def _ProcessOptions(self, options):
     if len(options.revisions) < 1:
       if not options.patch:
-        print "Either a patch file or revision numbers must be specified"
+        print("Either a patch file or revision numbers must be specified")
         return False
       if not options.message:
-        print "You must specify a merge comment if no patches are specified"
+        print("You must specify a merge comment if no patches are specified")
         return False
     options.bypass_upload_hooks = True
     # CC ulan to make sure that fixes are merged to Google3.
@@ -233,8 +236,8 @@ class MergeToBranch(ScriptsBase):
     for revision in options.revisions:
       if (IsSvnNumber(revision) or
           (revision[0:1] == "r" and IsSvnNumber(revision[1:]))):
-        print "Please provide full git hashes of the patches to merge."
-        print "Got: %s" % revision
+        print("Please provide full git hashes of the patches to merge.")
+        print("Got: %s" % revision)
         return False
     return True
 

tools/release/mergeinfo.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import sys
@@ -77,32 +80,32 @@ def get_first_v8_version(branches):
   return version
 
 def print_analysis(git_working_dir, hash_to_search):
-  print '1.) Searching for "' + hash_to_search + '"'
-  print '=====================ORIGINAL COMMIT START==================='
-  print describe_commit(git_working_dir, hash_to_search)
-  print '=====================ORIGINAL COMMIT END====================='
-  print '2.) General information:'
+  print('1.) Searching for "' + hash_to_search + '"')
+  print('=====================ORIGINAL COMMIT START===================')
+  print(describe_commit(git_working_dir, hash_to_search))
+  print('=====================ORIGINAL COMMIT END=====================')
+  print('2.) General information:')
   branches = get_branches_for_commit(git_working_dir, hash_to_search)
-  print 'Is LKGR:         ' + str(is_lkgr(branches))
-  print 'Is on Canary:    ' + str(get_first_canary(branches))
-  print 'First V8 branch: ' + str(get_first_v8_version(branches)) + \
-      ' (Might not be the rolled version)'
-  print '3.) Found follow-up commits, reverts and ports:'
+  print('Is LKGR:         ' + str(is_lkgr(branches)))
+  print('Is on Canary:    ' + str(get_first_canary(branches)))
+  print('First V8 branch: ' + str(get_first_v8_version(branches)) + \
+      ' (Might not be the rolled version)')
+  print('3.) Found follow-up commits, reverts and ports:')
   followups = get_followup_commits(git_working_dir, hash_to_search)
   for followup in followups:
-    print describe_commit(git_working_dir, followup, True)
+    print(describe_commit(git_working_dir, followup, True))
 
-  print '4.) Found merges:'
+  print('4.) Found merges:')
   merges = get_merge_commits(git_working_dir, hash_to_search)
   for currentMerge in merges:
-    print describe_commit(git_working_dir, currentMerge, True)
-    print '---Merged to:'
+    print(describe_commit(git_working_dir, currentMerge, True))
+    print('---Merged to:')
     mergeOutput = git_execute(git_working_dir, ['branch',
                                                 '--contains',
                                                 currentMerge,
                                                 '-r']).strip()
-    print mergeOutput
-  print 'Finished successfully'
+    print(mergeOutput)
+  print('Finished successfully')
 
 if __name__ == '__main__':  # pragma: no cover
   parser = argparse.ArgumentParser('Tool to check where a git commit was'

tools/release/push_to_candidates.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import sys
@@ -46,7 +49,7 @@ class Preparation(Step):
 
     if(self["current_branch"] == self.Config("CANDIDATESBRANCH")
        or self["current_branch"] == self.Config("BRANCHNAME")):
-      print "Warning: Script started on branch %s" % self["current_branch"]
+      print("Warning: Script started on branch %s" % self["current_branch"])
 
     self.PrepareBranch()
     self.DeleteBranch(self.Config("CANDIDATESBRANCH"))
@@ -347,10 +350,10 @@ class PushToCandidates(ScriptsBase):
 
   def _ProcessOptions(self, options):  # pragma: no cover
     if not options.manual and not options.reviewer:
-      print "A reviewer (-r) is required in (semi-)automatic mode."
+      print("A reviewer (-r) is required in (semi-)automatic mode.")
       return False
     if not options.manual and not options.author:
-      print "Specify your chromium.org email with -a in (semi-)automatic mode."
+      print("Specify your chromium.org email with -a in (semi-)automatic mode.")
       return False
 
     options.tbr_commit = not options.manual

tools/release/roll_merge.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 from collections import OrderedDict
 import sys
@@ -202,7 +205,7 @@ class TagRevision(Step):
   MESSAGE = "Create the tag."
 
   def RunStep(self):
-    print "Creating tag %s" % self["version"]
+    print("Creating tag %s" % self["version"])
     self.vc.Tag(self["version"],
                 self.vc.RemoteBranch(self["merge_to_branch"]),
                 self["commit_title"])
@@ -213,11 +216,11 @@ class CleanUp(Step):
 
   def RunStep(self):
     self.CommonCleanup()
-    print "*** SUMMARY ***"
-    print "version: %s" % self["version"]
-    print "branch: %s" % self["merge_to_branch"]
+    print("*** SUMMARY ***")
+    print("version: %s" % self["version"])
+    print("branch: %s" % self["merge_to_branch"])
     if self["revision_list"]:
-      print "patches: %s" % self["revision_list"]
+      print("patches: %s" % self["revision_list"])
 
 
 class RollMerge(ScriptsBase):
@@ -241,10 +244,10 @@ class RollMerge(ScriptsBase):
   def _ProcessOptions(self, options):
     if len(options.revisions) < 1:
       if not options.patch:
-        print "Either a patch file or revision numbers must be specified"
+        print("Either a patch file or revision numbers must be specified")
         return False
       if not options.message:
-        print "You must specify a merge comment if no patches are specified"
+        print("You must specify a merge comment if no patches are specified")
         return False
     options.bypass_upload_hooks = True
     # CC ulan to make sure that fixes are merged to Google3.
@@ -254,8 +257,8 @@ class RollMerge(ScriptsBase):
     for revision in options.revisions:
       if (IsSvnNumber(revision) or
           (revision[0:1] == "r" and IsSvnNumber(revision[1:]))):
-        print "Please provide full git hashes of the patches to merge."
-        print "Got: %s" % revision
+        print("Please provide full git hashes of the patches to merge.")
+        print("Got: %s" % revision)
         return False
     return True
 

tools/release/script_test.py

@@ -29,6 +29,9 @@
 # Wraps test execution with a coverage analysis. To get the best speed, the
 # native python coverage version >= 3.7.1 should be installed.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import coverage
 import os
 import unittest
@@ -46,7 +49,7 @@ def Main(argv):
   ])
   unittest.TextTestRunner(verbosity=2).run(unittest.TestSuite(alltests))
   cov.stop()
-  print cov.report()
+  print(cov.report())
 
 
 if __name__ == '__main__':

tools/release/search_related_commits.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import operator
 import os
@@ -17,7 +20,7 @@ def search_all_related_commits(
   all_commits_raw = _find_commits_inbetween(
       start_hash, until, git_working_dir, verbose)
   if verbose:
-    print "All commits between <of> and <until>: " + all_commits_raw
+    print("All commits between <of> and <until>: " + all_commits_raw)
 
   # Adding start hash too
   all_commits = [start_hash]
@@ -61,7 +64,7 @@ def _search_related_commits(
 
   commit_position = matches.group(2)
   if verbose:
-    print "1.) Commit position to look for: " + commit_position
+    print("1.) Commit position to look for: " + commit_position)
 
   search_range = start_hash + ".." + until
 
@@ -78,13 +81,13 @@ def _search_related_commits(
       git_working_dir, git_args(start_hash), verbose).strip()
 
   if verbose:
-    print "2.) Found by hash: " + found_by_hash
+    print("2.) Found by hash: " + found_by_hash)
 
   found_by_commit_pos = git_execute(
       git_working_dir, git_args(commit_position), verbose).strip()
 
   if verbose:
-    print "3.) Found by commit position: " + found_by_commit_pos
+    print("3.) Found by commit position: " + found_by_commit_pos)
 
   # Replace brackets or else they are wrongly interpreted by --grep
   title = title.replace("[", "\\[")
@@ -94,7 +97,7 @@ def _search_related_commits(
       git_working_dir, git_args(title), verbose).strip()
 
   if verbose:
-    print "4.) Found by title: " + found_by_title
+    print("4.) Found by title: " + found_by_title)
 
   hits = (
       _convert_to_array(found_by_hash) +
@@ -132,8 +135,8 @@ def _remove_duplicates(array):
 def git_execute(working_dir, args, verbose=False):
   command = ["git", "-C", working_dir] + args
   if verbose:
-    print "Git working dir: " + working_dir
-    print "Executing git command:" + str(command)
+    print("Git working dir: " + working_dir)
+    print("Executing git command:" + str(command))
   p = Popen(args=command, stdin=PIPE,
             stdout=PIPE, stderr=PIPE)
   output, err = p.communicate()
@@ -141,7 +144,7 @@ def git_execute(working_dir, args, verbose=False):
   if rc != 0:
     raise Exception(err)
   if verbose:
-    print "Git return value: " + output
+    print("Git return value: " + output)
   return output
 
 def _pretty_print_entry(hash, git_dir, pre_text, verbose):
@@ -215,4 +218,4 @@ if __name__ == "__main__":  # pragma: no cover
   args = sys.argv[1:]
   options = parser.parse_args(args)
   for current_line in main(options):
-    print current_line
+    print(current_line)

tools/release/test_scripts.py

@@ -26,6 +26,9 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import shutil
 import tempfile
@@ -383,11 +386,11 @@ class ScriptTest(unittest.TestCase):
     return script(TEST_CONFIG, self, self._state).RunSteps([step_class], args)
 
   def Call(self, fun, *args, **kwargs):
-    print "Calling %s with %s and %s" % (str(fun), str(args), str(kwargs))
+    print("Calling %s with %s and %s" % (str(fun), str(args), str(kwargs)))
 
   def Command(self, cmd, args="", prefix="", pipe=True, cwd=None):
-    print "%s %s" % (cmd, args)
-    print "in %s" % cwd
+    print("%s %s" % (cmd, args))
+    print("in %s" % cwd)
     return self._mock.Call("command", cmd + " " + args, cwd=cwd)
 
   def ReadLine(self):

tools/run-clang-tidy.py

@@ -4,6 +4,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import json
 import multiprocessing
 import optparse
@@ -376,29 +379,29 @@ def main():
     options.build_folder = DetectBuildFolder()
 
   if not CheckClangTidy():
-    print 'Could not find clang-tidy'
+    print('Could not find clang-tidy')
   elif options.build_folder is None or not os.path.isdir(options.build_folder):
-    print 'Please provide a build folder with -b'
+    print('Please provide a build folder with -b')
   elif options.gen_compdb:
     GenerateCompileCommands(options.build_folder)
   elif not CheckCompDB(options.build_folder):
-    print 'Could not find compilation database, ' \
-      'please generate it with --gen-compdb'
+    print('Could not find compilation database, ' \
+      'please generate it with --gen-compdb')
   else:
-    print 'Using build folder:', options.build_folder
+    print('Using build folder:', options.build_folder)
     if options.full:
-      print 'Running clang-tidy - full'
+      print('Running clang-tidy - full')
       ClangTidyRunFull(options.build_folder,
                        options.no_output_filter,
                        options.checks,
                        options.auto_fix)
     elif options.aggregate:
-      print 'Running clang-tidy - aggregating warnings'
+      print('Running clang-tidy - aggregating warnings')
       if options.auto_fix:
-        print 'Auto fix not working in aggregate mode, running without.'
+        print('Auto fix not working in aggregate mode, running without.')
       ClangTidyRunAggregate(options.build_folder, options.show_loc)
     elif options.single:
-      print 'Running clang-tidy - single on ' + options.file_name
+      print('Running clang-tidy - single on ' + options.file_name)
       if options.file_name is not None:
         line_ranges = []
         for match in re.findall(r'(\[.*?\])', options.line_ranges):
@@ -409,9 +412,9 @@ def main():
                                options.auto_fix,
                                line_ranges)
       else:
-        print 'Filename provided, please specify a filename with --file'
+        print('Filename provided, please specify a filename with --file')
     else:
-      print 'Running clang-tidy'
+      print('Running clang-tidy')
       ClangTidyRunDiff(options.build_folder,
                        options.diff_branch,
                        options.auto_fix)

tools/run_perf.py

@@ -99,6 +99,10 @@ Path pieces are concatenated. D8 is always run with the suite's path as cwd.
 The test flags are passed to the js test file after '--'.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+from functools import reduce
+
 from collections import OrderedDict
 import json
 import logging
@@ -114,6 +118,11 @@ from testrunner.local import android
 from testrunner.local import command
 from testrunner.local import utils
 
+try:
+  basestring       # Python 2
+except NameError:  # Python 3
+  basestring = str
+
 ARCH_GUESS = utils.DefaultArch()
 SUPPORTED_ARCHS = ["arm",
                    "ia32",
@@ -1074,7 +1083,7 @@ def Main(args):
         def Runner():
           """Output generator that reruns several times."""
           total_runs = runnable.run_count * options.run_count_multiplier
-          for i in xrange(0, max(1, total_runs)):
+          for i in range(0, max(1, total_runs)):
             # TODO(machenbach): Allow timeout per arch like with run_count per
             # arch.
             try:
@@ -1092,12 +1101,12 @@ def Main(args):
     if options.json_test_results:
       results.WriteToFile(options.json_test_results)
     else:  # pragma: no cover
-      print results
+      print(results)
 
   if options.json_test_results_secondary:
     results_secondary.WriteToFile(options.json_test_results_secondary)
   else:  # pragma: no cover
-    print results_secondary
+    print(results_secondary)
 
   if results.errors or have_failed_tests[0]:
     return 1

tools/sanitizers/sancov_formatter.py

@@ -39,6 +39,10 @@ directory. It's not checked out by default and must be added as a custom deps:
     'https://chromium.googlesource.com/external/llvm.org/compiler-rt.git'
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+from functools import reduce
+
 import argparse
 import json
 import logging
@@ -426,26 +430,26 @@ def main(args=None):
   options.build_dir = os.path.abspath(options.build_dir)
   if options.action.lower() == 'all':
     if not options.json_output:
-      print '--json-output is required'
+      print('--json-output is required')
       return 1
     write_instrumented(options)
   elif options.action.lower() == 'merge':
     if not options.coverage_dir:
-      print '--coverage-dir is required'
+      print('--coverage-dir is required')
       return 1
     if not options.json_input:
-      print '--json-input is required'
+      print('--json-input is required')
       return 1
     if not options.json_output:
-      print '--json-output is required'
+      print('--json-output is required')
       return 1
     merge(options)
   elif options.action.lower() == 'split':
     if not options.json_input:
-      print '--json-input is required'
+      print('--json-input is required')
       return 1
     if not options.output_dir:
-      print '--output-dir is required'
+      print('--output-dir is required')
       return 1
     split(options)
   return 0

tools/sanitizers/sancov_merger.py

@@ -106,7 +106,7 @@ def generate_inputs(keep, coverage_dir, file_map, cpus):
     n = max(2, int(math.ceil(len(files) / float(cpus))))
 
     # Chop files into buckets.
-    buckets = [files[i:i+n] for i in xrange(0, len(files), n)]
+    buckets = [files[i:i+n] for i in range(0, len(files), n)]
 
     # Inputs for multiprocessing. List of tuples containing:
     # Keep-files option, base path, executable name, index of bucket,

tools/sanitizers/sanitize_pcs.py

@@ -5,7 +5,10 @@
 
 """Corrects objdump output. The logic is from sancov.py, see comments there."""
 
-import sys;
+# for py2/py3 compatibility
+from __future__ import print_function
+
+import sys
 
 for line in sys.stdin:
-  print '0x%x' % (int(line.strip(), 16) + 4)
+  print('0x%x' % (int(line.strip(), 16) + 4))

tools/stats-viewer.py

@@ -34,6 +34,9 @@ The stats viewer reads counters from a binary file and displays them
 in a window, re-reading and re-displaying with regular intervals.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import mmap
 import optparse
 import os
@@ -100,7 +103,7 @@ class StatsViewer(object):
     if not os.path.exists(self.data_name):
       maps_name = "/proc/%s/maps" % self.data_name
       if not os.path.exists(maps_name):
-        print "\"%s\" is neither a counter file nor a PID." % self.data_name
+        print("\"%s\" is neither a counter file nor a PID." % self.data_name)
         sys.exit(1)
       maps_file = open(maps_name, "r")
       try:
@@ -110,7 +113,7 @@ class StatsViewer(object):
             self.data_name = m.group(0)
             break
         if self.data_name is None:
-          print "Can't find counter file in maps for PID %s." % self.data_name
+          print("Can't find counter file in maps for PID %s." % self.data_name)
           sys.exit(1)
       finally:
         maps_file.close()
@@ -123,7 +126,7 @@ class StatsViewer(object):
       return CounterCollection(data_access)
     elif data_access.IntAt(0) == CHROME_COUNTERS_FILE_MAGIC_NUMBER:
       return ChromeCounterCollection(data_access)
-    print "File %s is not stats data." % self.data_name
+    print("File %s is not stats data." % self.data_name)
     sys.exit(1)
 
   def CleanUp(self):
@@ -143,7 +146,7 @@ class StatsViewer(object):
       self.RefreshCounters()
       changed = True
     else:
-      for i in xrange(self.data.CountersInUse()):
+      for i in range(self.data.CountersInUse()):
         counter = self.data.Counter(i)
         name = counter.Name()
         if name in self.ui_counters:
@@ -188,7 +191,7 @@ class StatsViewer(object):
       sorted by prefix.
     """
     names = {}
-    for i in xrange(self.data.CountersInUse()):
+    for i in range(self.data.CountersInUse()):
       counter = self.data.Counter(i)
       name = counter.Name()
       names[name] = counter
@@ -233,7 +236,7 @@ class StatsViewer(object):
                              text=counter_name)
         name.grid(row=index, column=0, padx=1, pady=1)
       count = len(counter_objs)
-      for i in xrange(count):
+      for i in range(count):
         counter = counter_objs[i]
         name = counter.Name()
         var = Tkinter.StringVar()
@@ -435,7 +438,7 @@ class ChromeCounterCollection(object):
 
   def CountersInUse(self):
     """Return the number of counters in active use."""
-    for i in xrange(self.max_counters):
+    for i in range(self.max_counters):
       name_offset = self.counter_names_offset + i * self._COUNTER_NAME_SIZE
       if self.data.ByteAt(name_offset) == 0:
         return i

tools/torque/format-torque.py

@@ -6,6 +6,9 @@
 """This program either generates the parser files for Torque, generating
 the source and header files directly in V8's src directory."""
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import subprocess
 import sys
 import re
@@ -96,13 +99,13 @@ def process(filename, lint, should_format):
   output, err = p.communicate(preprocess(content))
   output = postprocess(output)
   rc = p.returncode
-  if (rc <> 0):
-    print "error code " + str(rc) + " running clang-format. Exiting..."
+  if (rc != 0):
+    print("error code " + str(rc) + " running clang-format. Exiting...")
     sys.exit(rc);
 
   if lint:
     if (output != original_input):
-      print >>sys.stderr, filename + ' requires formatting'
+      print(filename + ' requires formatting', file=sys.stderr)
 
   if should_format:
     output_file = open(filename, 'w')
@@ -110,14 +113,14 @@ def process(filename, lint, should_format):
     output_file.close()
 
 def print_usage():
-  print 'format-torque -i file1[, file2[, ...]]'
-  print '    format and overwrite input files'
-  print 'format-torque -l file1[, file2[, ...]]'
-  print '    merely indicate which files need formatting'
+  print('format-torque -i file1[, file2[, ...]]')
+  print('    format and overwrite input files')
+  print('format-torque -l file1[, file2[, ...]]')
+  print('    merely indicate which files need formatting')
 
 def Main():
   if len(sys.argv) < 3:
-    print "error: at least 2 arguments required"
+    print("error: at least 2 arguments required")
     print_usage();
     sys.exit(-1)
 
@@ -137,7 +140,7 @@ def Main():
       lint = True
       should_format = True
   else:
-    print "error: -i and/or -l flags must be specified"
+    print("error: -i and/or -l flags must be specified")
     print_usage();
     sys.exit(-1);
 

tools/torque/make-torque-parser.py

@@ -23,7 +23,7 @@ result = subprocess.call(cargs)
 os.chdir(cwd)
 
 def fix_file(filename):
-  is_header = re.search(r'\.h', filename) <> None;
+  is_header = re.search(r'\.h', filename) is not None;
   header_macro = filename.upper();
   header_macro = re.sub('\.', '_', header_macro);
   header_macro = "V8_TORQUE_" + header_macro + '_';

tools/trace-maps-processor.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 
 
@@ -169,4 +172,4 @@ elif action == "count":
     reasons_list.append("%8d %s" % (reasons[r], r))
   reasons_list.sort(reverse=True)
   for r in reasons_list[:20]:
-    print r
+    print(r)

tools/try_perf.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import argparse
 import os
 import subprocess
@@ -67,11 +70,11 @@ def main():
         help='Add %s trybot.' % BOTS[option])
   options = parser.parse_args()
   if not options.bots:
-    print 'No trybots specified. Using default %s.' % ','.join(DEFAULT_BOTS)
+    print('No trybots specified. Using default %s.' % ','.join(DEFAULT_BOTS))
     options.bots = DEFAULT_BOTS
 
   if not options.benchmarks:
-    print 'Please specify the benchmarks to run as arguments.'
+    print('Please specify the benchmarks to run as arguments.')
     return 1
 
   for benchmark in options.benchmarks:
@@ -79,7 +82,7 @@ def main():
       print ('%s not found in our benchmark list. The respective trybot might '
             'fail, unless you run something this script isn\'t aware of. '
             'Available public benchmarks: %s' % (benchmark, PUBLIC_BENCHMARKS))
-      print 'Proceed anyways? [Y/n] ',
+      print('Proceed anyways? [Y/n] ', end=' ')
       answer = sys.stdin.readline().strip()
       if answer != "" and answer != "Y" and answer != "y":
         return 1
@@ -100,7 +103,7 @@ def main():
     cmd += ['-p \'extra_flags="%s"\'' % options.extra_flags]
   if options.verbose:
     cmd.append('-vv')
-    print 'Running %s' % ' '.join(cmd)
+    print('Running %s' % ' '.join(cmd))
   subprocess.check_call(' '.join(cmd), shell=True, cwd=V8_BASE)
 
 if __name__ == '__main__':  # pragma: no cover

tools/turbolizer-perf.py

@@ -2,6 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import sys
 import json
@@ -25,7 +28,7 @@ def trace_begin():
           known_addrs.add(result.group(0))
 
 def trace_end():
-  print json.dumps(json_obj)
+  print(json.dumps(json_obj))
 
 def process_event(param_dict):
   addr = "0x%x" % int(param_dict['sample']['ip'])

tools/unittests/run_perf_test.py

@@ -3,6 +3,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 from collections import namedtuple
 import coverage
 import json
@@ -103,8 +106,8 @@ class PerfTest(unittest.TestCase):
   @classmethod
   def tearDownClass(cls):
     cls._cov.stop()
-    print ""
-    print cls._cov.report()
+    print("")
+    print(cls._cov.report())
 
   def setUp(self):
     self.maxDiff = None

tools/unittests/run_tests_test.py

@@ -17,6 +17,9 @@ with different test suite extensions and build configurations.
 # TODO(machenbach): Coverage data from multiprocessing doesn't work.
 # TODO(majeski): Add some tests for the fuzzers.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import collections
 import contextlib
 import json
@@ -126,7 +129,7 @@ class SystemTest(unittest.TestCase):
       import coverage
       if int(coverage.__version__.split('.')[0]) < 4:
         cls._cov = None
-        print 'Python coverage version >= 4 required.'
+        print('Python coverage version >= 4 required.')
         raise ImportError()
       cls._cov = coverage.Coverage(
           source=([os.path.join(TOOLS_ROOT, 'testrunner')]),
@@ -142,7 +145,7 @@ class SystemTest(unittest.TestCase):
       cls._cov.exclude('assert False')
       cls._cov.start()
     except ImportError:
-      print 'Running without python coverage.'
+      print('Running without python coverage.')
     sys.path.append(TOOLS_ROOT)
     global standard_runner
     from testrunner import standard_runner
@@ -157,8 +160,8 @@ class SystemTest(unittest.TestCase):
   def tearDownClass(cls):
     if cls._cov:
       cls._cov.stop()
-      print ''
-      print cls._cov.report(show_missing=True)
+      print('')
+      print(cls._cov.report(show_missing=True))
 
   def testPass(self):
     """Test running only passing tests in two variants.

tools/unittests/testdata/d8_mocked1.py

@@ -3,5 +3,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-print 'Richards: 1.2'
-print 'DeltaBlue: 2.1'
+# for py2/py3 compatibility
+from __future__ import print_function
+
+print('Richards: 1.2')
+print('DeltaBlue: 2.1')

tools/unittests/testdata/d8_mocked2.py

@@ -3,8 +3,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-print 'Richards1: 1'
-print 'DeltaBlue1: 1'
-print 'Richards2: 0.2'
-print 'DeltaBlue2: 1.0'
-print 'DeltaBlue3: 0.1'
+# for py2/py3 compatibility
+from __future__ import print_function
+
+print('Richards1: 1')
+print('DeltaBlue1: 1')
+print('Richards2: 0.2')
+print('DeltaBlue2: 1.0')
+print('DeltaBlue3: 0.1')

tools/unittests/testdata/predictable_mocked.py

@@ -3,22 +3,25 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 
 assert len(sys.argv) == 3
 
 if sys.argv[1] == 'equal':
   # 1. Scenario: print equal allocation hashes.
-  print '### Allocations = 9497, hash = 0xc322c6b0'
+  print('### Allocations = 9497, hash = 0xc322c6b0')
 elif sys.argv[1] == 'differ':
   # 2. Scenario: print different allocation hashes. This prints a different
   # hash on the second run, based on the content of a semaphore file. This
   # file is expected to be empty in the beginning.
   with open(sys.argv[2]) as f:
     if f.read():
-      print '### Allocations = 9497, hash = 0xc322c6b0'
+      print('### Allocations = 9497, hash = 0xc322c6b0')
     else:
-      print '### Allocations = 9497, hash = 0xc322c6b1'
+      print('### Allocations = 9497, hash = 0xc322c6b1')
   with open(sys.argv[2], 'w') as f:
     f.write('something')
 else:

tools/unittests/testdata/results_processor.py

@@ -7,6 +7,9 @@
 Fake results processor for testing that just sums some things up.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import fileinput
 import re
 
@@ -21,5 +24,5 @@ for line in fileinput.input():
   if match:
     deltablue += float(match.group(1))
 
-print 'Richards: %f' % richards
-print 'DeltaBlue: %f' % deltablue
+print('Richards: %f' % richards)
+print('DeltaBlue: %f' % deltablue)

tools/unittests/testdata/testroot1/d8_mocked.py

@@ -6,10 +6,13 @@
 Dummy d8 replacement. Just passes all test, except if 'berries' is in args.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import sys
 
 args = ' '.join(sys.argv[1:])
-print args
+print(args)
 # Let all berries fail.
 if 'berries' in args:
   sys.exit(1)

tools/unittests/testdata/testroot2/d8_mocked.py

@@ -6,12 +6,15 @@
 Dummy d8 replacement for flaky tests.
 """
 
+# for py2/py3 compatibility
+from __future__ import print_function
+
 import os
 import sys
 
 PATH = os.path.dirname(os.path.abspath(__file__))
 
-print ' '.join(sys.argv[1:])
+print(' '.join(sys.argv[1:]))
 
 # Test files ending in 'flakes' should first fail then pass. We store state in
 # a file side by side with the executable. No clean-up required as all tests

tools/update-object-macros-undef.py

 #!/usr/bin/env python3
+
 # Copyright 2018 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.

tools/v8_presubmit.py

@@ -27,10 +27,14 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+
+# for py2/py3 compatibility
+from __future__ import print_function
+
 try:
   import hashlib
   md5er = hashlib.md5
-except ImportError, e:
+except ImportError as e:
   import md5
   md5er = md5.new
 
@@ -84,7 +88,7 @@ def CppLintWorker(command):
       out_line = process.stderr.readline()
       if out_line == '' and process.poll() != None:
         if error_count == -1:
-          print "Failed to process %s" % command.pop()
+          print("Failed to process %s" % command.pop())
           return 1
         break
       m = LINT_OUTPUT_PATTERN.match(out_line)
@@ -268,7 +272,7 @@ class CacheableSourceFileProcessor(SourceFileProcessor):
       files = cache.FilterUnchangedFiles(files)
 
     if len(files) == 0:
-      print 'No changes in %s files detected. Skipping check' % self.file_type
+      print('No changes in %s files detected. Skipping check' % self.file_type)
       return True
 
     files_requiring_changes = self.DetectFilesToChange(files)
@@ -293,7 +297,7 @@ class CacheableSourceFileProcessor(SourceFileProcessor):
     try:
       results = pool.map_async(worker, commands).get(timeout=240)
     except KeyboardInterrupt:
-      print "\nCaught KeyboardInterrupt, terminating workers."
+      print("\nCaught KeyboardInterrupt, terminating workers.")
       pool.terminate()
       pool.join()
       sys.exit(1)
@@ -487,12 +491,12 @@ class SourceProcessor(SourceFileProcessor):
     base = basename(name)
     if not base in SourceProcessor.IGNORE_TABS:
       if '\t' in contents:
-        print "%s contains tabs" % name
+        print("%s contains tabs" % name)
         result = False
     if not base in SourceProcessor.IGNORE_COPYRIGHTS and \
         not SourceProcessor.IGNORE_COPYRIGHTS_DIRECTORY in name:
       if not COPYRIGHT_HEADER_PATTERN.search(contents):
-        print "%s is missing a correct copyright header." % name
+        print("%s is missing a correct copyright header." % name)
         result = False
     if ' \n' in contents or contents.endswith(' '):
       line = 0
@@ -505,34 +509,34 @@ class SourceProcessor(SourceFileProcessor):
         lines.append(str(line))
       linenumbers = ', '.join(lines)
       if len(lines) > 1:
-        print "%s has trailing whitespaces in lines %s." % (name, linenumbers)
+        print("%s has trailing whitespaces in lines %s." % (name, linenumbers))
       else:
-        print "%s has trailing whitespaces in line %s." % (name, linenumbers)
+        print("%s has trailing whitespaces in line %s." % (name, linenumbers))
       result = False
     if not contents.endswith('\n') or contents.endswith('\n\n'):
-      print "%s does not end with a single new line." % name
+      print("%s does not end with a single new line." % name)
       result = False
     # Sanitize flags for fuzzer.
     if ".js" in name and ("mjsunit" in name or "debugger" in name):
       match = FLAGS_LINE.search(contents)
       if match:
-        print "%s Flags should use '-' (not '_')" % name
+        print("%s Flags should use '-' (not '_')" % name)
         result = False
       if not "mjsunit/mjsunit.js" in name:
         if ASSERT_OPTIMIZED_PATTERN.search(contents) and \
             not FLAGS_ENABLE_OPT.search(contents):
-          print "%s Flag --opt should be set if " \
-                "assertOptimized() is used" % name
+          print("%s Flag --opt should be set if " \
+                "assertOptimized() is used" % name)
           result = False
         if ASSERT_UNOPTIMIZED_PATTERN.search(contents) and \
             not FLAGS_NO_ALWAYS_OPT.search(contents):
-          print "%s Flag --no-always-opt should be set if " \
-                "assertUnoptimized() is used" % name
+          print("%s Flag --no-always-opt should be set if " \
+                "assertUnoptimized() is used" % name)
           result = False
 
       match = self.runtime_function_call_pattern.search(contents)
       if match:
-        print "%s has unexpected spaces in a runtime call '%s'" % (name, match.group(1))
+        print("%s has unexpected spaces in a runtime call '%s'" % (name, match.group(1)))
         result = False
     return result
 
@@ -548,7 +552,7 @@ class SourceProcessor(SourceFileProcessor):
           violations += 1
       finally:
         handle.close()
-    print "Total violating files: %s" % violations
+    print("Total violating files: %s" % violations)
     return success
 
 def _CheckStatusFileForDuplicateKeys(filepath):
@@ -655,7 +659,7 @@ def PyTests(workspace):
       join(workspace, 'tools', 'unittests', 'run_tests_test.py'),
       join(workspace, 'tools', 'testrunner', 'testproc', 'variant_unittest.py'),
     ]:
-    print 'Running ' + script
+    print('Running ' + script)
     result &= subprocess.call(
         [sys.executable, script], stdout=subprocess.PIPE) == 0
 
@@ -677,22 +681,22 @@ def Main():
   parser = GetOptions()
   (options, args) = parser.parse_args()
   success = True
-  print "Running checkdeps..."
+  print("Running checkdeps...")
   success &= CheckDeps(workspace)
   use_linter_cache = not options.no_linter_cache
   if not options.no_lint:
-    print "Running C++ lint check..."
+    print("Running C++ lint check...")
     success &= CppLintProcessor(use_cache=use_linter_cache).RunOnPath(workspace)
 
-  print "Running Torque formatting check..."
+  print("Running Torque formatting check...")
   success &= TorqueLintProcessor(use_cache=use_linter_cache).RunOnPath(
     workspace)
-  print "Running copyright header, trailing whitespaces and " \
-        "two empty lines between declarations check..."
+  print("Running copyright header, trailing whitespaces and " \
+        "two empty lines between declarations check...")
   success &= SourceProcessor().RunOnPath(workspace)
-  print "Running status-files check..."
+  print("Running status-files check...")
   success &= StatusFilesProcessor().RunOnPath(workspace)
-  print "Running python tests..."
+  print("Running python tests...")
   success &= PyTests(workspace)
   if success:
     return 0