stack_core.py

#!/usr/bin/env 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.

"""stack symbolizes native crash dumps."""

import re
import symbol
import unittest

import example_crashes

def ConvertTrace(lines):
  tracer = TraceConverter()
  print "Reading symbols from", symbol.SYMBOLS_DIR
  tracer.ConvertTrace(lines)

class TraceConverter:
  process_info_line = re.compile("(pid: [0-9]+, tid: [0-9]+.*)")
  abi_line = re.compile("(ABI: \'(.*)\')")
  revision_line = re.compile("(Revision: \'(.*)\')")
  signal_line = re.compile("(signal [0-9]+ \(.*\).*)")
  abort_message_line = re.compile("(Abort message: '.*')")
  thread_line = re.compile("(.*)(\-\-\- ){15}\-\-\-")
  dalvik_jni_thread_line = re.compile("(\".*\" prio=[0-9]+ tid=[0-9]+ NATIVE.*)")
  dalvik_native_thread_line = re.compile("(\".*\" sysTid=[0-9]+ nice=[0-9]+.*)")
  register_line = re.compile("$a")
  trace_line = re.compile("$a")
  value_line = re.compile("$a")
  code_line = re.compile("$a")
  trace_lines = []
  value_lines = []
  last_frame = -1
  width = "{8}"
  spacing = ""

  def __init__(self):
    self.UpdateAbiRegexes()

  register_names = {
    "arm": "r0|r1|r2|r3|r4|r5|r6|r7|r8|r9|sl|fp|ip|sp|lr|pc|cpsr",
    "arm64": "x0|x1|x2|x3|x4|x5|x6|x7|x8|x9|x10|x11|x12|x13|x14|x15|x16|x17|x18|x19|x20|x21|x22|x23|x24|x25|x26|x27|x28|x29|x30|sp|pc|pstate",
    "mips": "zr|at|v0|v1|a0|a1|a2|a3|t0|t1|t2|t3|t4|t5|t6|t7|s0|s1|s2|s3|s4|s5|s6|s7|t8|t9|k0|k1|gp|sp|s8|ra|hi|lo|bva|epc",
    "mips64": "zr|at|v0|v1|a0|a1|a2|a3|a4|a5|a6|a7|t0|t1|t2|t3|s0|s1|s2|s3|s4|s5|s6|s7|t8|t9|k0|k1|gp|sp|s8|ra|hi|lo|bva|epc",
    "x86": "eax|ebx|ecx|edx|esi|edi|x?cs|x?ds|x?es|x?fs|x?ss|eip|ebp|esp|flags",
    "x86_64": "rax|rbx|rcx|rdx|rsi|rdi|r8|r9|r10|r11|r12|r13|r14|r15|cs|ss|rip|rbp|rsp|eflags",
  }

  def UpdateAbiRegexes(self):
    if symbol.ARCH == "arm64" or symbol.ARCH == "mips64" or symbol.ARCH == "x86_64":
      self.width = "{16}"
      self.spacing = "        "
    else:
      self.width = "{8}"
      self.spacing = ""

    self.register_line = re.compile("(([ ]*\\b(" + self.register_names[symbol.ARCH] + ")\\b +[0-9a-f]" + self.width + "){2,5})")

    # Note that both trace and value line matching allow for variable amounts of
    # whitespace (e.g. \t). This is because the we want to allow for the stack
    # tool to operate on AndroidFeedback provided system logs. AndroidFeedback
    # strips out double spaces that are found in tombsone files and logcat output.
    #
    # Examples of matched trace lines include lines from tombstone files like:
    #   #00  pc 001cf42e  /data/data/com.my.project/lib/libmyproject.so
    #
    # Or lines from AndroidFeedback crash report system logs like:
    #   03-25 00:51:05.520 I/DEBUG ( 65): #00 pc 001cf42e /data/data/com.my.project/lib/libmyproject.so
    # Please note the spacing differences.
    self.trace_line = re.compile("(.*)\#([0-9]+)[ \t]+(..)[ \t]+([0-9a-f]" + self.width + ")[ \t]+([^\r\n \t]*)( \((.*)\))?")  # pylint: disable-msg=C6310
    # Examples of matched value lines include:
    #   bea4170c  8018e4e9  /data/data/com.my.project/lib/libmyproject.so
    #   bea4170c  8018e4e9  /data/data/com.my.project/lib/libmyproject.so (symbol)
    #   03-25 00:51:05.530 I/DEBUG ( 65): bea4170c 8018e4e9 /data/data/com.my.project/lib/libmyproject.so
    # Again, note the spacing differences.
    self.value_line = re.compile("(.*)([0-9a-f]" + self.width + ")[ \t]+([0-9a-f]" + self.width + ")[ \t]+([^\r\n \t]*)( \((.*)\))?")
    # Lines from 'code around' sections of the output will be matched before
    # value lines because otheriwse the 'code around' sections will be confused as
    # value lines.
    #
    # Examples include:
    #   801cf40c ffffc4cc 00b2f2c5 00b2f1c7 00c1e1a8
    #   03-25 00:51:05.530 I/DEBUG ( 65): 801cf40c ffffc4cc 00b2f2c5 00b2f1c7 00c1e1a8
    self.code_line = re.compile("(.*)[ \t]*[a-f0-9]" + self.width +
                                "[ \t]*[a-f0-9]" + self.width +
                                "[ \t]*[a-f0-9]" + self.width +
                                "[ \t]*[a-f0-9]" + self.width +
                                "[ \t]*[a-f0-9]" + self.width +
                                "[ \t]*[ \r\n]")  # pylint: disable-msg=C6310

  def CleanLine(self, ln):
    # AndroidFeedback adds zero width spaces into its crash reports. These
    # should be removed or the regular expresssions will fail to match.
    return unicode(ln, errors='ignore')

  def PrintTraceLines(self, trace_lines):
    """Print back trace."""
    maxlen = max(map(lambda tl: len(tl[1]), trace_lines))
    print
    print "Stack Trace:"
    print "  RELADDR   " + self.spacing + "FUNCTION".ljust(maxlen) + "  FILE:LINE"
    for tl in self.trace_lines:
      (addr, symbol_with_offset, location) = tl
      print "  %8s  %s  %s" % (addr, symbol_with_offset.ljust(maxlen), location)
    return

  def PrintValueLines(self, value_lines):
    """Print stack data values."""
    maxlen = max(map(lambda tl: len(tl[2]), self.value_lines))
    print
    print "Stack Data:"
    print "  ADDR      " + self.spacing + "VALUE     " + "FUNCTION".ljust(maxlen) + "  FILE:LINE"
    for vl in self.value_lines:
      (addr, value, symbol_with_offset, location) = vl
      print "  %8s  %8s  %s  %s" % (addr, value, symbol_with_offset.ljust(maxlen), location)
    return

  def PrintOutput(self, trace_lines, value_lines):
    if self.trace_lines:
      self.PrintTraceLines(self.trace_lines)
    if self.value_lines:
      self.PrintValueLines(self.value_lines)

  def PrintDivider(self):
    print
    print "-----------------------------------------------------\n"

  def ConvertTrace(self, lines):
    lines = map(self.CleanLine, lines)
    for line in lines:
      self.ProcessLine(line)
    self.PrintOutput(self.trace_lines, self.value_lines)

  def ProcessLine(self, line):
    ret = False
    process_header = self.process_info_line.search(line)
    signal_header = self.signal_line.search(line)
    abort_message_header = self.abort_message_line.search(line)
    thread_header = self.thread_line.search(line)
    register_header = self.register_line.search(line)
    abi_header = self.abi_line.search(line)
    revision_header = self.revision_line.search(line)
    dalvik_jni_thread_header = self.dalvik_jni_thread_line.search(line)
    dalvik_native_thread_header = self.dalvik_native_thread_line.search(line)
    if process_header or signal_header or abort_message_header or thread_header or abi_header or \
        register_header or dalvik_jni_thread_header or dalvik_native_thread_header or revision_header:
      ret = True
      if self.trace_lines or self.value_lines:
        self.PrintOutput(self.trace_lines, self.value_lines)
        self.PrintDivider()
        self.trace_lines = []
        self.value_lines = []
        self.last_frame = -1
      if process_header:
        print process_header.group(1)
      if signal_header:
        print signal_header.group(1)
      if abort_message_header:
        print abort_message_header.group(1)
      if register_header:
        print register_header.group(1)
      if thread_header:
        print thread_header.group(1)
      if dalvik_jni_thread_header:
        print dalvik_jni_thread_header.group(1)
      if dalvik_native_thread_header:
        print dalvik_native_thread_header.group(1)
      if revision_header:
        print revision_header.group(1)
      if abi_header:
        print abi_header.group(1)
        symbol.ARCH = abi_header.group(2)
        self.UpdateAbiRegexes()
      return ret
    if self.trace_line.match(line):
      ret = True
      match = self.trace_line.match(line)
      (unused_0, frame, unused_1,
       code_addr, area, symbol_present, symbol_name) = match.groups()

      if frame <= self.last_frame and (self.trace_lines or self.value_lines):
        self.PrintOutput(self.trace_lines, self.value_lines)
        self.PrintDivider()
        self.trace_lines = []
        self.value_lines = []
      self.last_frame = frame

      if area == "<unknown>" or area == "[heap]" or area == "[stack]":
        self.trace_lines.append((code_addr, "", area))
      else:
        # If a calls b which further calls c and c is inlined to b, we want to
        # display "a -> b -> c" in the stack trace instead of just "a -> c"
        info = symbol.SymbolInformation(area, code_addr)
        nest_count = len(info) - 1
        for (source_symbol, source_location, object_symbol_with_offset) in info:
          if not source_symbol:
            if symbol_present:
              source_symbol = symbol.CallCppFilt(symbol_name)
            else:
              source_symbol = "<unknown>"
          if not source_location:
            source_location = area
          if nest_count > 0:
            nest_count = nest_count - 1
            arrow = "v------>"
            if symbol.ARCH == "arm64" or symbol.ARCH == "mips64" or symbol.ARCH == "x86_64":
              arrow = "v-------------->"
            self.trace_lines.append((arrow, source_symbol, source_location))
          else:
            if not object_symbol_with_offset:
              object_symbol_with_offset = source_symbol
            self.trace_lines.append((code_addr,
                                object_symbol_with_offset,
                                source_location))
    if self.code_line.match(line):
      # Code lines should be ignored. If this were exluded the 'code around'
      # sections would trigger value_line matches.
      return ret
    if self.value_line.match(line):
      ret = True
      match = self.value_line.match(line)
      (unused_, addr, value, area, symbol_present, symbol_name) = match.groups()
      if area == "<unknown>" or area == "[heap]" or area == "[stack]" or not area:
        self.value_lines.append((addr, value, "", area))
      else:
        info = symbol.SymbolInformation(area, value)
        (source_symbol, source_location, object_symbol_with_offset) = info.pop()
        if not source_symbol:
          if symbol_present:
            source_symbol = symbol.CallCppFilt(symbol_name)
          else:
            source_symbol = "<unknown>"
        if not source_location:
          source_location = area
        if not object_symbol_with_offset:
          object_symbol_with_offset = source_symbol
        self.value_lines.append((addr,
                            value,
                            object_symbol_with_offset,
                            source_location))

    return ret


class RegisterPatternTests(unittest.TestCase):
  def assert_register_matches(self, abi, example_crash, stupid_pattern):
    tc = TraceConverter()
    for line in example_crash.split('\n'):
      tc.ProcessLine(line)
      is_register = (re.search(stupid_pattern, line) is not None)
      matched = (tc.register_line.search(line) is not None)
      self.assertEquals(matched, is_register, line)
    tc.PrintOutput(tc.trace_lines, tc.value_lines)

  def test_arm_registers(self):
    self.assert_register_matches("arm", example_crashes.arm, '\\b(r0|r4|r8|ip)\\b')

  def test_arm64_registers(self):
    self.assert_register_matches("arm64", example_crashes.arm64, '\\b(x0|x4|x8|x12|x16|x20|x24|x28|sp)\\b')

  def test_mips_registers(self):
    self.assert_register_matches("mips", example_crashes.mips, '\\b(zr|a0|t0|t4|s0|s4|t8|gp|hi)\\b')

  def test_x86_registers(self):
    self.assert_register_matches("x86", example_crashes.x86, '\\b(eax|esi|xcs|eip)\\b')

  def test_x86_64_registers(self):
    self.assert_register_matches("x86_64", example_crashes.x86_64, '\\b(rax|rsi|r8|r12|cs|rip)\\b')


if __name__ == '__main__':
    unittest.main()