Custom objdump to enable perf annotation

tools/objdump-v8

 #!/usr/bin/env python
-# Copyright 2014 the V8 project authors. All rights reserved.
+#
+# 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.
 
-# Wraps test execution with a coverage analysis. To get the best speed, the
-# native python coverage version >= 3.7.1 should be installed.
-
-import coverage
-import os
-import unittest
+import re
+import subprocess
 import sys
 
 
-def Main(argv):
-  script_path = os.path.dirname(os.path.abspath(__file__))
-  cov = coverage.coverage(include=([os.path.join(script_path, '*.py')]))
-  cov.start()
-  import test_scripts
-  alltests = map(unittest.TestLoader().loadTestsFromTestCase, [
-    test_scripts.ToplevelTest,
-    test_scripts.ScriptTest,
-    test_scripts.SystemTest,
-  ])
-  unittest.TextTestRunner(verbosity=2).run(unittest.TestSuite(alltests))
-  cov.stop()
-  print cov.report()
+def get_address_bounds():
+  start = -1
+  end = -1
+  for arg in sys.argv:
+    if arg.startswith("--start-address="):
+      start = int(arg[-12:], 16)
+    if arg.startswith("--stop-address="):
+      end = int(arg[-12:], 16)
+  return start, end
 
 
-if __name__ == '__main__':
-  sys.exit(Main(sys.argv))
+def format_line(line):
+  pieces = line.split(None, 3)
+  return " " + pieces[0][2:] + ":\t" + pieces[3]
+
+
+def is_comment(line):
+  stripped = line.strip()
+  return stripped.startswith("--") or stripped.startswith(";;;")
+
+def main():
+  filename = sys.argv[-1]
+  match = re.match(r"/tmp/perf-(.*)\.map", filename)
+  if match:
+    start, end = get_address_bounds()
+    codefile = "code-" + match.group(1) + "-1.asm"

[Benedikt Meurer, 2016/07/21 03:50:34]

d8 hardcodes code.asm as output, so this will not work for d8 itself. Can you
just fallback to code.asm if the code-<pid>-<isolate>.asm file is not found?

+    with open(codefile, "r") as code:
+      printing = False
+      for line in code:
+        if line.startswith("0x"):
+          addr = int(line.split()[0], 0)
+          if start <= addr <= end:
+            printing = True
+            sys.stdout.write(format_line(line))
+          elif printing:
+            break
+        elif printing and not is_comment(line):
+          break
+  else:
+    sys.argv[0] = "objdump"
+    sys.exit(subprocess.call(sys.argv))
+
+if __name__ == "__main__":
+  main()