[Android] Use fast ELF symbolizer for symbols.py and tombstones.

third_party/android_platform/development/scripts/symbol.py

 #!/usr/bin/python
 #
 # Copyright (C) 2013 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
 """Module for looking up symbolic debugging information.
 
 The information can include symbol names, offsets, and source locations.
 """
 
 import os
 import re
+import sys
 import subprocess
 
 CHROME_SRC = os.path.join(os.path.realpath(os.path.dirname(__file__)),
                           os.pardir, os.pardir, os.pardir, os.pardir)
 ANDROID_BUILD_TOP = CHROME_SRC
 SYMBOLS_DIR = CHROME_SRC
 CHROME_SYMBOLS_DIR = CHROME_SRC
 
 ARCH = "arm"
 
 TOOLCHAIN_INFO = None
 
+sys.path.insert(0, os.path.join(CHROME_SRC, 'build', 'android'))
+from pylib.symbols import elf_symbolizer
+
 def Uname():
   """'uname' for constructing prebuilt/<...> and out/host/<...> paths."""
   uname = os.uname()[0]
   if uname == "Darwin":
     proc = os.uname()[-1]
     if proc == "i386" or proc == "x86_64":
       return "darwin-x86"
     return "darwin-ppc"
   if uname == "Linux":
     return "linux-x86"
@@ skipping 187 matching lines @@
     each address has a list of associated symbols and locations
     or an empty list if no symbol information was found.
 
     If the function has been inlined then the list may contain
     more than one element with the symbols for the most deeply
     nested inlined location appearing first.
   """
   if not lib:
     return None
 
-
   symbols = SYMBOLS_DIR + lib
   if not os.path.isfile(symbols):
     return None
 
+  addrs = sorted(unique_addrs)
+  result = {}
+
+  def _Callback(sym, addr):
+    records = []
+    while sym:  # Traverse all the inlines following the |inlined_by| chain.
+      if sym.source_path:
+        location = '%s:%d' % (sym.source_path, sym.source_line)
+      else:
+        location = None
+      records += [(sym.name, location)]
+      sym = sym.inlined_by
+    result[addr] = records
+
   (label, platform, target) = FindToolchain()
-  cmd = [ToolPath("addr2line"), "--functions", "--inlines",
-      "--demangle", "--exe=" + symbols]
-  child = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+  symbolizer = elf_symbolizer.ELFSymbolizer(
+      elf_file_path=symbols,
+      addr2line_path=ToolPath("addr2line"),
+      callback=_Callback,
+      inlines=True)
 
-  result = {}
-  addrs = sorted(unique_addrs)
   for addr in addrs:
-    child.stdin.write("0x%s\n" % addr)
-    child.stdin.flush()
-    records = []
-    first = True
-    while True:
-      symbol = child.stdout.readline().strip()
-      if symbol == "??":
-        symbol = None
-      location = child.stdout.readline().strip()
-      if location == "??:0":
-        location = None
-      if symbol is None and location is None:
-        break
-      records.append((symbol, location))
-      if first:
-        # Write a blank line as a sentinel so we know when to stop
-        # reading inlines from the output.
-        # The blank line will cause addr2line to emit "??\n??:0\n".
-        child.stdin.write("\n")
-        first = False
-    result[addr] = records
-  child.stdin.close()
-  child.stdout.close()
+    symbolizer.SymbolizeAsync(int(addr, 16), addr)
+  symbolizer.Join()
   return result
 
 
 def StripPC(addr):
   """Strips the Thumb bit a program counter address when appropriate.
 
   Args:
     addr: the program counter address
 
   Returns:
@@ skipping 93 matching lines @@
   process.stdin.write("\n")
   process.stdin.close()
   demangled_symbol = process.stdout.readline().strip()
   process.stdout.close()
   return demangled_symbol
 
 def FormatSymbolWithOffset(symbol, offset):
   if offset == 0:
     return symbol
   return "%s+%d" % (symbol, offset)