[turbolizer] Add support for showing perf profiling information.

tools/turbolizer/perf-turbo.py

Index: tools/turbolizer/perf-turbo.py
diff --git a/tools/turbolizer/perf-turbo.py b/tools/turbolizer/perf-turbo.py
new file mode 100644
index 0000000000000000000000000000000000000000..c90a1174d48769f7a544cb18d70977b4448f9588
--- /dev/null
+++ b/tools/turbolizer/perf-turbo.py
@@ -0,0 +1,56 @@
+# 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.
+
+import os
+import sys
+import json
+import re
+import argparse
+
+sys.path.append(os.environ['PERF_EXEC_PATH'] + \
+  '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
+
+from perf_trace_context import *
+from Core import *
+
+def trace_begin():
+  json_obj['eventCounts'] = {}
+  prog = re.compile(r'0x[0-9a-fA-F]+')
+  for phase in reversed(json_obj['phases']):
+    if phase['name'] == "disassembly":
+      for line in phase['data'].splitlines():
+        result = re.match(prog, line)
+        if result:
+          known_addrs.add(result.group(0))
+
+def trace_end():
+  print json.dumps(json_obj)
+
+def process_event(param_dict):
+  addr = "0x%x" % int(param_dict['sample']['ip'])
+
+  # Only count samples that belong to the function
+  if addr not in known_addrs:
+    return
+
+  ev_name = param_dict['ev_name']
+  if ev_name not in json_obj['eventCounts']:
+    json_obj['eventCounts'][ev_name] = {}
+  if addr not in json_obj['eventCounts'][ev_name]:
+    json_obj['eventCounts'][ev_name][addr] = 0
+  json_obj['eventCounts'][ev_name][addr] += 1
+
+if __name__ == "__main__":
+  parser = argparse.ArgumentParser(
+      description="Perf script to merge profiling data with turbofan compiler "
+                  "traces.")
+  parser.add_argument("file_name", metavar="JSON File",
+      help="turbo trace json file.")
+
+  args = parser.parse_args()
+
+  with open(args.file_name, 'r') as json_file:
+    json_obj = json.load(json_file)
+
+  known_addrs = set()