Dump C++ symbols and merge into v8 log.

tools/dump-cpp.py

Index: tools/dump-cpp.py
diff --git a/tools/dump-cpp.py b/tools/dump-cpp.py
new file mode 100644
index 0000000000000000000000000000000000000000..9a17d9ef28e7fe985e83920b30149eaf0b7a1540
--- /dev/null
+++ b/tools/dump-cpp.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+#

[Michael Achenbach, 2016/04/26 12:16:10]

nit: Use short copyright header for new files.

[lpy, 2016/04/26 17:57:58]

Done.

+# Copyright 2016 the V8 project authors. All rights reserved.
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of Google Inc. nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# This script executes dumpcpp.js, collects all dumped C++ symbols,
+# and merges them back into v8 log.
+
+import os
+import platform
+import re
+import subprocess
+import sys
+
+def isFileExecutable(fPath):

[Michael Achenbach, 2016/04/26 12:16:10]

nit: I prefer consistent underscore method names, like is_file_executable

[lpy, 2016/04/26 17:57:58]

Done.

+  return os.path.isfile(fPath) and os.access(fPath, os.X_OK)
+
+if __name__ == '__main__':
+  JS_FILES = ['splaytree.js', 'codemap.js', 'csvparser.js', 'consarray.js',
+              'profile.js', 'logreader.js', 'tickprocessor.js', 'SourceMap.js',
+              'dumpcpp.js']
+  tools_path = os.path.dirname(os.path.realpath(__file__))
+  on_windows = True if platform.system() == 'Windows' else False

[Michael Achenbach, 2016/04/26 12:16:10]

on_windows = platform.system() == 'Windows'

[lpy, 2016/04/26 17:57:58]

Done.

+  for i in range(0, len(JS_FILES)):

[Michael Achenbach, 2016/04/26 12:16:10]

Readability:
JS_FILES = [os.path.join(tools_path, f) for f in JS_FILES]

[lpy, 2016/04/26 17:57:58]

Done.

+    JS_FILES[i] = os.path.join(tools_path, JS_FILES[i])
+
+  args = []
+  log_file = 'v8.log'
+  debug = False
+  for i in range(1, len(sys.argv)):

[Michael Achenbach, 2016/04/26 12:16:10]

Readability:
for arg in sys.argv[1:]:
  # s/sys.argv[i]/arg

[lpy, 2016/04/26 17:57:58]

Done.

+    if sys.argv[i] == '--debug':
+      debug = True
+      continue
+    args.append(sys.argv[i])
+    if not sys.argv[i].startswith('-'):
+      log_file = sys.argv[i]
+
+  if on_windows:
+    args.append('--windows')
+
+  with open(log_file, 'r') as f:
+    lines = f.readlines()
+
+  d8_line = re.search(',\"(.*d8)', ''.join(lines))
+  if d8_line:
+    d8_exec = d8_line.groups()[0]

[Michael Achenbach, 2016/04/26 12:16:10]

d8_exec = d8_line.groups()[0]
equivalent to
d8_exec = d8_line.group(1)

[lpy, 2016/04/26 17:57:58]

Done.

+  else:
+    print 'No d8 binary path found in {}.'.format(log_file)
+    exit(-1)

[Michael Achenbach, 2016/04/26 12:16:10]

Rather sys.exit(-1) in scripts I guess.

[lpy, 2016/04/26 17:57:58]

Done.

+
+  args = [d8_exec] + JS_FILES + ['--'] + args
+
+  with open(log_file) as f:

[Michael Achenbach, 2016/04/26 12:16:10]

I'm not familiar with this pattern. Will it keep the logfile open until all data
is processed by sp.communicate()? What if the process is very slow? Wouldn't the
with clause close the file before it's exhausted?

[lpy, 2016/04/26 17:57:58]

Sorry, I should put sp.communicate() in the clause.

+    sp = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=f)
+  out, err = sp.communicate()
+  if debug:
+    print err
+  if sp.returncode != 0:
+    print out
+    exit(-1)
+
+  if on_windows and out:
+    out = re.sub('\r+\n', '\n', out)
+
+  is_written = False if out else True

[Michael Achenbach, 2016/04/26 12:16:10]

Readability:
is_written = not out

or if you prefer:
is_written = not bool(out)

[lpy, 2016/04/26 17:57:58]

Done.

+  with open(log_file, 'w+') as f:

[Michael Achenbach, 2016/04/26 12:16:10]

How about just w as you only write to the file?

[lpy, 2016/04/26 17:57:58]

Done.

+    for line in lines:
+      if not is_written and line.startswith('tick'):
+        f.write(out)

[Michael Achenbach, 2016/04/26 12:16:10]

So you append all symbols right after the first tick?

[lpy, 2016/04/26 17:57:58]

Yes.

+        is_written = True
+      f.write(line)