Android: Add new debugging scripts (adb_gdb_xxx)

build/android/adb_gdb

+#!/bin/bash
+#
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+
+# A generic script used to attach to a running Chromium process and
+# debug it. Most users should not use this directly, but one of the
+# wrapper scripts like adb_gdb_content_shell, or adb_gdb_drt
+#
+# Use --help to print full usage instructions.
+#
+
+PROGNAME=$(basename "$0")
+PROGDIR=$(dirname "$0")
+
+# Location of Chromium-top-level sources.
+CHROMIUM_SRC=$(cd "$PROGDIR"/../.. && pwd 2>/dev/null)
+
+TMPDIR=
+GDBSERVER_PIDFILE=
+TARGET_GDBSERVER=
+
+clean_exit () {

[bulach, 2012/10/17 14:20:04]

these functions here (up to 54:log) have the "{" in the same line, the remaining
of the file have in the next line..

[digit1, 2012/10/18 12:33:26]

Done.

+  if [ "$TMPDIR" ]; then
+    GDBSERVER_PID=$(cat $GDBSERVER_PIDFILE 2>/dev/null)
+    if [ "$GDBSERVER_PID" ]; then
+      log "Killing background gdbserver process: $GDBSERVER_PID"
+      kill -9 $GDBSERVER_PID >/dev/null 2>&1
+    fi
+    if [ "$TARGET_GDBSERVER" ]; then
+      log "Removing target gdbserver binary: $TARGET_GDBSERVER."
+      "$ADB" shell rm "$TARGET_GDBSERVER" >/dev/null 2>&1
+    fi
+    log "Cleaning up: $TMPDIR"
+    rm -rf "$TMPDIR"
+  fi
+  exit $1
+}
+
+# Ensure clean exit on Ctrl-C.
+trap "clean_exit 1" INT
+
+panic () {
+  echo "ERROR: $@" >&2
+  clean_exit 1
+}
+
+fail_panic () {
+  if [ $? != 0 ]; then panic "$@"; fi
+}
+
+log () {
+  if [ "$VERBOSE" -gt 0 ]; then
+    echo "$@"
+  fi
+}
+
+DEFAULT_PULL_LIBS_DIR=/tmp/$USER-adb-gdb-libs
+
+# NOTE: Allow wrapper scripts to set various default through ADB_GDB_XXX
+# environment variables. This is only for cosmetic reasons, i.e. to
+# display proper
+
+# Allow wrapper scripts to set the default activity through
+# the ADB_GDB_ACTIVITY variable. Users are still able to change the
+# final activity name through --activity=<name> option.
+#
+# This is only for cosmetic reasons, i.e. to display the proper default
+# in the --help output.
+#
+DEFAULT_ACTIVITY=${ADB_GDB_ACTIVITY:-".Main"}
+
+# Allow wrapper scripts to set the program name through ADB_GDB_PROGNAME
+PROGNAME=${ADB_GDB_PROGNAME:-$(basename "$0")}
+
+ACTIVITY=$DEFAULT_ACTIVITY
+ADB=
+ANNOTATE=
+# Note: Ignore BUILDTYPE variable, because the Ninja build doesn't use it.
+BUILDTYPE=
+FORCE=
+GDBINIT=
+GDBSERVER=
+HELP=
+NDK_DIR=
+NO_PULL_LIBS=
+PACKAGE_NAME=
+PID=
+PROGRAM_NAME="activity"
+PULL_LIBS=
+PULL_LIBS_DIR=
+SANDBOXED=
+SANDBOXED_INDEX=
+START=
+SYMBOL_DIR=
+TARGET_ARCH=
+TOOLCHAIN=
+VERBOSE=0
+
+for opt; do
+  optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)')
+  case $opt in
+    --adb=*)
+      ADB=$optarg
+      ;;
+    --activity=*)
+      ACTIVITY=$optarg
+      ;;
+    --annotate=3)
+      ANNOTATE=$optarg
+      ;;
+    --force)
+      FORCE=true
+      ;;
+    --gdbserver=*)
+      GDBSERVER=$optarg
+      ;;
+    --help|-h|-?)
+      HELP=true
+      ;;
+    --ndk-dir=*)
+      NDK_DIR=$optarg
+      ;;
+    --no-pull-libs)
+      NO_PULL_LIBS=true
+      ;;
+    --package-name=*)
+      PACKAGE_NAME=$optarg
+      ;;
+    --pid=*)
+      PID=$optarg
+      ;;
+    --program-name=*)
+      PROGRAM_NAME=$optarg
+      ;;
+    --pull-libs)
+      PULL_LIBS=true
+      ;;
+    --pull-libs-dir=*)
+      PULL_LIBS_DIR=$optarg
+      ;;
+    --sandboxed)
+      SANDBOXED=true
+      ;;
+    --sandboxed=*)
+      SANDBOXED=true
+      SANDBOXED_INDEX=$optarg
+      ;;
+    --script=*)
+      GDBINIT=$optarg
+      ;;
+    --start)
+      START=true
+      ;;
+    --symbol-dir=*)
+      SYMBOL_DIR=$optarg
+      ;;
+    --target-arch=*)
+      TARGET_ARCH=$optarg
+      ;;
+    --toolchain=*)
+      TOOLCHAIN=$optarg
+      ;;
+    --verbose)
+      VERBOSE=$(( $VERBOSE + 1 ))
+      ;;
+    --debug)
+      BUILDTYPE=Debug
+      ;;
+    --release)
+      BUILDTYPE=Release
+      ;;
+    -*)
+      panic "Unknown option $OPT, see --help." >&2
+      ;;
+    *)
+      if [ "$PACKAGE_NAME" ]; then
+        panic "You can only provide a single package name as argument!\
+ See --help."
+      fi
+      PACKAGE_NAME=$opt
+      ;;
+  esac
+done
+
+print_help_options ()
+{
+  cat <<EOF
+EOF
+}
+
+if [ "$HELP" ]; then
+  if [ "$ADB_GDB_PROGNAME" ]; then
+    # Assume wrapper scripts all provide a default package name.
+    cat <<EOF
+Usage: $PROGNAME [options]
+
+Attach gdb to a running Android $PROGRAM_NAME process.
+EOF
+  else
+    # Assume this is a direct call to adb_gdb
+  cat <<EOF
+Usage: $PROGNAME [options] [<package-name>]
+
+Attach gdb to a running Android $PROGRAM_NAME process.
+
+If provided, <package-name> must be the name of the Android application's
+package name to be debugged. You can also use --package-name=<name> to
+specify it.
+EOF
+  fi
+
+  cat <<EOF
+
+This script is used to debug a running $PROGRAM_NAME process.
+This can be a regular Android application process, or a sandboxed
+service, if you use the --sandboxed or --sandboxed=<num> option.
+
+This script needs several things to work properly. It will try to pick
+them up automatically for you though:
+
+   - target gdbserver binary
+   - host gdb client (e.g. arm-linux-androideabi-gdb)
+   - directory with symbolic version of $PROGRAM_NAME's shared libraries.
+
+If you have sourced Chromium's build/android/envsetup.sh, this script will
+find all of them automatically. This is the recommended way to use it.
+
+Otherwise, if you have ANDROID_NDK_ROOT defined in your environment,
+the script will use it to find the gdb and gdbserver binaries. You can
+also use --ndk-dir=<path> to specify an alternative NDK installation
+directory.
+
+The script tries to find the most recent version of the debug version of
+shared libraries under one of the following directories:
+
+  \$CHROMIUM_SRC/out/Release/lib/           (used by Ninja builds)
+  \$CHROMIUM_SRC/out/Debug/lib/             (used by Ninja builds)
+  \$CHROMIUM_SRC/out/Release/lib.target/    (used by Make builds)
+  \$CHROMIUM_SRC/out/Debug/lib.target/      (used by Make builds)
+
+You can restrict this search by using --release or --debug to specify the
+build type, or simply use --symbol-dir=<path> to specify the file manually.
+
+The script tries to extract the target architecture from your GYP_DEFINES,
+but if this fails, will default to 'arm'. Use --target-arch=<name> to force
+its value.
+
+Otherwise, the script will complain, but you can use the --gdbserver,
+--gdb and --symbol-lib options to specify everything manually.
+
+An alternative to --gdb=<file> is to use --toollchain=<path> to specify
+the path to the host target-specific cross-toolchain.
+
+You will also need the 'adb' tool in your path. Otherwise, use the --adb
+option. The script will complain if there is more than one device connected
+and ANDROID_SERIAL is not defined.
+
+The first time you use it on a device, the script will pull many system
+libraries required by the process into a temporary directory. This
+is done to strongly improve the debugging experience, like allowing
+readable thread stacks and more. The libraries are copied to the following
+directory by default:
+
+  $DEFAULT_PULL_LIBS_DIR/
+
+But you can use the --pull-libs-dir=<path> option to specify an
+alternative. The script can detect when you change the connected device,
+and will re-pull the libraries only in this case. You can however force it
+with the --pull-libs option.
+
+Any local .gdbinit script will be ignored, but it is possible to pass a
+gdb command script with the --script=<file> option. Note that its commands
+will be passed to gdb after the remote connection and library symbol
+loading have completed.
+
+Valid options:
+  --help|-h|-?          Print this message.
+  --verbose             Increase verbosity.
+
+  --sandboxed           Debug first sandboxed process we find.
+  --sandboxed=<num>     Debug specific sandboxed process.
+  --symbol-dir=<path>   Specify directory with symbol shared libraries.
+  --package-name=<name> Specify package name (alternative to 1st argument).
+  --program-name=<name> Specify program name (cosmetic only).
+  --pid=<pid>           Specify application process pid.
+  --force               Kill any previous debugging session, if any.
+  --start               Start package's activity on device.
+  --activity=<name>     Activity name for --start [$DEFAULT_ACTIVITY].
+  --annotate=<num>      Enable gdb annotation.
+  --script=<file>       Specify extra GDB init script.
+
+  --gdbserver=<file>    Specify targer gdbserver binary.
+  --gdb=<program>       Specify host gdb client binary.
+  --target-arch=<name>  Specify NDK target arch.
+  --adb=<program>       Specify host ADB binary.
+
+  --pull-libs           Force system libraries extraction.
+  --no-pull-libs        Do not extract any system library.
+  --libs-dir=<path>     Specify system libraries extraction directory.
+
+  --debug               Use libraries under out/Debug.
+  --release             Use libraries under out/Release.
+
+EOF
+  exit 0
+fi
+
+if [ -z "$PACKAGE_NAME" ]; then
+  panic "Please specify a package name on the command line. See --help."
+fi
+
+if [ -z "$NDK_DIR" ]; then
+  if [ -z "$ANDROID_NDK_ROOT" ]; then
+    panic "Can't find NDK directory, please source \
+build/android/envsetup.sh!"
+  fi
+else
+  if [ ! -d "$NDK_DIR" ]; then
+    panic "Invalid directory: $NDK_DIR"
+  fi
+  if [ ! -f "$NDK_DIR/ndk-build" ]; then
+    panic "Not a valid NDK directory: $NDK_DIR"
+  fi
+  ANDROID_NDK_ROOT=$NDK_DIR
+fi
+
+if [ "$GDBINIT" -a ! -f "$GDBINIT" ]; then
+  panic "Unknown --script file: $GDBINIT"
+fi
+
+# Find the target architecture from our $GYP_DEFINES
+# This returns an NDK-compatible architecture name.
+# out: NDK Architecture name, or empty string.
+get_gyp_target_arch ()
+{
+  local ARCH=$(echo $GYP_DEFINES | tr ' ' '\n' | grep '^target_arch=' |\
+               cut -d= -f2)
+  case $ARCH in
+    ia32|i?86|x86) echo "x86";;
+    mips|arm) echo "$ARCH";;
+    *) echo "";
+  esac
+}
+
+if [ -z "$TARGET_ARCH" ]; then
+  TARGET_ARCH=$(get_gyp_target_arch)
+  if [ -z "$TARGET_ARCH" ]; then
+    TARGET_ARCH=arm
+  fi
+else
+  # Nit: accept Chromium's 'ia32' as a valid target architecture. This
+  # script prefers the NDK 'x86' name instead because it uses it to find
+  # NDK-specific files (host gdb) with it.
+  if [ "$TARGET_ARCH" = "ia32" ]; then
+    TARGET_ARCH=x86
+    log "Auto-config: --arch=$TARGET_ARCH  (equivalent to ia32)"
+  fi
+fi
+
+# Detect the NDK system tag, i.e. the name used to identify the host.
+# out: NDK system tag (e.g. 'linux-x86').
+get_ndk_host_tag ()
+{
+  if [ -z "$NDK_HOST_TAG" ]; then
+    case $(uname -s) in
+      Linux) NDK_HOST_TAG=linux-x86;;
+      Darwin) NDK_HOST_TAG=darwin-x86;;
+      *) panic "You can't run this script on this system: $uname -a";;
+    esac
+  fi
+  echo "$NDK_HOST_TAG"
+}
+
+# Convert an NDK architecture name into a GNU configure triplet.
+# $1: NDK architecture name (e.g. 'arm')
+# Out: Android GNU configure triplet (e.g. 'arm-linux-androideabi')
+get_arch_gnu_config ()
+{
+  case $1 in
+    arm)
+      echo "arm-linux-androideabi"
+      ;;
+    x86)
+      echo "i686-linux-android"
+      ;;
+    mips)
+      echo "mipsel-linux-android"
+      ;;
+    *)
+      echo "$ARCH-linux-android"
+      ;;
+  esac
+}
+
+# Convert an NDK architecture name into a toolchain name prefix
+# $1: NDK architecture name (e.g. 'arm')
+# Out: NDK toolchain name prefix (e.g. 'arm-linux-androideabi')
+get_arch_toolchain_prefix ()
+{
+  # Return the configure triplet, except for x86!
+  if [ "$1" = "x86" ]; then
+    echo "$1"
+  else
+    get_arch_gnu_config $1
+  fi
+}
+
+# Find a NDK toolchain prebuilt file or sub-directory.
+# This will probe the various arch-specific toolchain directories
+# in the NDK for the needed file.
+# $1: NDK install path
+# $2: NDK architecture name
+# $3: prebuilt sub-path to look for.
+# Out: file path, or empty if none is found.
+get_ndk_toolchain_prebuilt ()
+{
+  local NDK_DIR="${1%/}"
+  local ARCH="$2"
+  local SUBPATH="$3"
+  local NAME="$(get_arch_toolchain_prefix $ARCH)"
+  local FILE TARGET
+  FILE=$NDK_DIR/toolchains/$NAME-4.6/prebuilt/$SUBPATH
+  if [ ! -f "$FILE" ]; then
+    FILE=$NDK_DIR/toolchains/$NAME-4.4.3/prebuilt/$SUBPATH
+    if [ ! -f "$FILE" ]; then
+      FILE=
+    fi
+  fi
+  echo "$FILE"
+}
+
+# Find the path to an NDK's toolchain full prefix for a given architecture
+# $1: NDK install path
+# $2: NDK architecture name
+# Out: install path + binary prefix (e.g.
+#      ".../path/to/bin/arm-linux-androideabi-")
+get_ndk_toolchain_fullprefix ()
+{
+  local NDK_DIR="$1"
+  local ARCH="$2"
+  local TARGET NAME HOST GCC CONFIG
+
+  # NOTE: This will need to be updated if the NDK changes the names or moves
+  #        the location of its prebuilt toolchains.
+  #
+  GCC=
+  HOST=$(get_ndk_host_tag)
+  CONFIG=$(get_arch_gnu_config $ARCH)
+  GCC=$(get_ndk_toolchain_prebuilt \
+        "$NDK_DIR" "$ARCH" "$HOST/bin/$CONFIG-gcc")
+  if [ ! -f "$GCC" -a "$ARCH" = "x86" ]; then
+    # Special case, the x86 toolchain used to be incorrectly
+    # named i686-android-linux-gcc!
+    GCC=$(get_ndk_toolchain_prebuilt \
+          "$NDK_DIR" "$ARCH" "$HOST/bin/i686-android-linux-gcc")
+  fi
+  if [ -z "$GCC" ]; then
+    panic "Cannot find Android NDK toolchain for '$ARCH' architecture. \
+Please verify your NDK installation!"
+  fi
+  echo "${GCC%%gcc}"
+}
+
+# $1: NDK install path
+# $2: target architecture.
+get_ndk_gdbserver ()
+{
+  local NDK_DIR="$1"
+  local ARCH=$2
+  local HOST=$(get_ndk_host_tag)
+  local BINARY
+
+  # The location has moved after NDK r8
+  BINARY=$NDK_DIR/prebuilt/android-$ARCH/gdbserver/gdbserver
+  if [ ! -f "$BINARY" ]; then
+    BINARY=$(get_ndk_toolchain_prebuilt "$NDK_DIR" "$ARCH" gdbserver)
+  fi
+  echo "$BINARY"
+}
+
+# Check/probe the path to the Android toolchain installation. Always
+# use the NDK versions of gdb and gdbserver. They must match to avoid
+# issues when both binaries do not speak the same wire protocol.
+#
+if [ -z "$TOOLCHAIN" ]; then
+  ANDROID_TOOLCHAIN=$(get_ndk_toolchain_fullprefix \
+                      "$ANDROID_NDK_ROOT" "$TARGET_ARCH")
+  ANDROID_TOOLCHAIN=$(dirname "$ANDROID_TOOLCHAIN")
+  log "Auto-config: --toolchain=$ANDROID_TOOLCHAIN"
+else
+  # Be flexible, allow one to specify either the install path or the bin
+  # sub-directory in --toolchain:
+  #
+  if [ -d "$TOOLCHAIN/bin" ]; then
+    TOOLCHAIN=$TOOLCHAIN/bin
+  fi
+  ANDROID_TOOLCHAIN=$TOOLCHAIN
+fi
+
+# Cosmetic: Remove trailing directory separator.
+ANDROID_TOOLCHAIN=${ANDROID_TOOLCHAIN%/}
+
+# Find host GDB client binary
+GDB=$(which $ANDROID_TOOLCHAIN/*-gdb 2>/dev/null | head -1)
+if [ -z "$GDB" ]; then
+  panic "Can't find Android gdb client in your path, check your \
+--toolchain path."
+fi
+log "Host gdb client: $GDB"
+
+# Find gdbserver binary, we will later push it to /data/local/tmp
+# This ensures that both gdbserver and $GDB talk the same binary protocol,
+# otherwise weird problems will appear.
+#
+if [ -z "$GDBSERVER" ]; then
+  GDBSERVER=$(get_ndk_gdbserver "$ANDROID_NDK_ROOT" "$TARGET_ARCH")
+  if [ -z "$GDBSERVER" ]; then
+    panic "Can't find NDK gdbserver binary. use --gdbserver to specify \
+valid one!"
+  fi
+  log "Auto-config: --gdbserver=$GDBSERVER"
+fi
+
+
+
+# Check that ADB is in our path
+if [ -z "$ADB" ]; then
+  ADB=$(which adb 2>/dev/null)
+  if [ -z "$ADB" ]; then
+    panic "Can't find 'adb' tool in your path. Install it or use \
+--adb=<file>"
+  fi
+  log "Auto-config: --adb=$ADB"
+fi
+
+# Check that it works minimally
+ADB_VERSION=$($ADB version 2>/dev/null)
+echo "$ADB_VERSION" | fgrep -q -e "Android Debug Bridge"
+if [ $? != 0 ]; then
+  panic "Your 'adb' tool seems invalid, use --adb=<file> to specify a \
+different one: $ADB"
+fi
+
+# If there are more than one device connected, and ANDROID_SERIAL is not
+# defined, print an error message.
+NUM_DEVICES_PLUS2=$($ADB devices 2>/dev/null | wc -l)
+if [ "$NUM_DEVICES_PLUS2" -lt 3 -a -z "$ANDROID_SERIAL" ]; then
+  echo "ERROR: There is more than one Android device connected to ADB."
+  echo "Please define ANDROID_SERIAL to specify which one to use."
+  exit 1
+fi
+
+# A unique ID for this script's session. This needs to be the same in all
+# sub-shell commands we're going to launch, so take the PID of the launcher
+# process.
+TMP_ID=$$
+
+# Temporary directory, will get cleaned up on exit.
+TMPDIR=/tmp/$USER-adb-gdb-tmp-$TMP_ID
+mkdir -p "$TMPDIR" && rm -rf "$TMPDIR"/*
+
+GDBSERVER_PIDFILE="$TMPDIR"/gdbserver-$TMP_ID.pid
+
+# Run a command through adb shell, strip the extra \r from the output
+# and return the correct status code to detect failures. This assumes
+# that the adb shell command prints a final \n to stdout.
+# $1+: command to run
+# Out: command's stdout
+# Return: command's status
+# Note: the command's stderr is lost
+adb_shell ()
+{
+  local TMPOUT="$(mktemp)"
+  local LASTLINE RET
+  local ADB=${ADB:-adb}
+
+  # The weird sed rule is to strip the final \r on each output line
+  # Since 'adb shell' never returns the command's proper exit/status code,
+  # we force it to print it as '%%<status>' in the temporary output file,
+  # which we will later strip from it.
+  $ADB shell $@ ";" echo "%%\$?" 2>/dev/null | \
+      sed -e 's![[:cntrl:]]!!g' > $TMPOUT
+  # Get last line in log, which contains the exit code from the command
+  LASTLINE=$(sed -e '$!d' $TMPOUT)
+  # Extract the status code from the end of the line, which must
+  # be '%%<code>'.
+  RET=$(echo "$LASTLINE" | \
+    awk '{ if (match($0, "%%[0-9]+$")) { print substr($0,RSTART+2); } }')
+  # Remove the status code from the last line. Note that this may result
+  # in an empty line.
+  LASTLINE=$(echo "$LASTLINE" | \
+    awk '{ if (match($0, "%%[0-9]+$")) { print substr($0,1,RSTART-1); } }')
+  # The output itself: all lines except the status code.
+  sed -e '$d' $TMPOUT && printf "%s" "$LASTLINE"
+  # Remove temp file.
+  rm -f $TMPOUT
+  # Exit with the appropriate status.
+  return $RET
+}
+
+# If --force is specified, try to kill any gdbserver process started by the
+# same user on the device. Normally, these are killed automatically by the
+# script on exit, but there are a few corner cases where this would still
+# be needed.
+if [ "$FORCE" ]; then
+  GDBSERVER_PIDS=$(adb_shell ps | awk '$9 ~ /gdbserver/ { print $2; }')
+  for GDB_PID in $GDBSERVER_PIDS; do
+    log "Killing previous gdbserver (PID=$GDB_PID)"
+    adb_shell kill -9 $GDB_PID
+  done
+fi
+
+if [ "$START" ]; then
+  log "Starting $PROGRAM_NAME on device."
+  adb_shell am start -n $PACKAGE_NAME/$ACTIVITY 2>/dev/null
+  adb_shell ps | grep -q $PACKAGE_NAME
+  fail_panic "Could not start $PROGRAM_NAME on device. Are you sure the \
+package is installed?"
+fi
+
+# Return the timestamp of a given time, as number of seconds since epoch.
+# $1: file path
+# Out: file timestamp
+get_file_timestamp ()
+{
+  stat -c %Y "$1" 2>/dev/null
+}
+
+# Detect the build type and symbol directory. This is done by finding
+# the most recent sub-directory containing debug shared libraries under
+# $CHROMIUM_SRC/out/
+#
+# $1: $BUILDTYPE value, can be empty
+# Out: nothing, but this sets SYMBOL_DIR
+#
+detect_symbol_dir () {
+  local SUBDIRS SUBDIR LIST DIR DIR_LIBS TSTAMP
+  # Note: Ninja places debug libraries under out/$BUILDTYPE/lib/, while
+  # Make places then under out/$BUILDTYPE/lib.target.
+  if [ "$1" ]; then
+    SUBDIRS="$1/lib $1/lib.target"
+  else
+    SUBDIRS="Release/lib Debug/lib Release/lib.target Debug/lib.target"
+  fi
+  LIST=$TMPDIR/scan-subdirs-$$.txt
+  printf "" > "$LIST"
+  for SUBDIR in $SUBDIRS; do
+    DIR=$CHROMIUM_SRC/out/$SUBDIR
+    if [ -d "$DIR" ]; then
+      # Ignore build directories that don't contain symbol versions
+      # of the shared libraries.
+      DIR_LIBS=$(ls "$DIR"/lib*.so 2>/dev/null)
+      if [ -z "$DIR_LIBS" ]; then
+        echo "No shared libs: $DIR"
+        continue
+      fi
+      TSTAMP=$(get_file_timestamp "$DIR")
+      printf "%s %s\n" "$TSTAMP" "$SUBDIR" >> "$LIST"
+    fi
+  done
+  SUBDIR=$(cat $LIST | sort -r | head -1 | cut -d" " -f2)
+  rm -f "$LIST"
+
+  if [ -z "$SUBDIR" ]; then
+    if [ -z "$1" ]; then
+      panic "Could not find any build directory under \
+$CHROMIUM_SRC/out. Please build the program first!"
+    else
+      panic "Could not find any $1 directory under \
+$CHROMIUM_SRC/out. Check your build type!"
+    fi
+  fi
+
+  SYMBOL_DIR=$CHROMIUM_SRC/out/$SUBDIR
+  log "Auto-config: --symbol-dir=$SYMBOL_DIR"
+}
+
+if [ -z "$SYMBOL_DIR" ]; then
+  detect_symbol_dir "$BUILDTYPE"
+fi
+
+# Allow several concurrent debugging sessions
+TARGET_GDBSERVER=/data/local/tmp/gdbserver-adb-gdb-$TMP_ID
+
+# Return the build fingerprint contained in a build.prop file.
+# $1: path to build.prop file
+get_build_fingerprint_from ()
+{
+  cat "$1" | grep -e '^ro.build.fingerprint=' | cut -d= -f2
+}
+
+
+ORG_PULL_LIBS_DIR=$PULL_LIBS_DIR
+PULL_LIBS_DIR=${PULL_LIBS_DIR:-$DEFAULT_PULL_LIBS_DIR}
+
+HOST_FINGERPRINT=
+DEVICE_FINGERPRINT=$(adb_shell getprop ro.build.fingerprint)
+log "Device build fingerprint: $DEVICE_FINGERPRINT"
+
+# If --pull-libs-dir is not specified, and this is a platform build, look
+# if we can use the symbolic libraries under $ANDROID_PRODUCT_OUT/symbols/
+# directly, if the build fingerprint matches the device.
+if [ -z "$ORG_PULL_LIBS_DIR" -a \
+     "$ANDROID_PRODUCT_OUT" -a \
+     -f "$ANDROID_PRODUCT_OUT/system/build.prop" ]; then
+  ANDROID_FINGERPRINT=$(get_build_fingerprint_from \
+                        "$ANDROID_PRODUCT_OUT"/system/build.prop)
+  log "Android build fingerprint:  $ANDROID_FINGERPRINT"
+  if [ "$ANDROID_FINGERPRINT" = "$DEVICE_FINGERPRINT" ]; then
+    log "Perfect match!"
+    PULL_LIBS_DIR=$ANDROID_PRODUCT_OUT/symbols
+    HOST_FINGERPRINT=$ANDROID_FINGERPRINT
+    if [ "$PULL_LIBS" ]; then
+      log "Ignoring --pull-libs since the device and platform build \
+fingerprints match."
+      NO_PULL_LIBS=true
+    fi
+  fi
+fi
+
+# If neither --pull-libs an --no-pull-libs were specified, check the build
+# fingerprints of the device, and the cached system libraries on the host.
+#
+if [ -z "$NO_PULL_LIBS" -a -z "$PULL_LIBS" ]; then
+  if [ ! -f "$PULL_LIBS_DIR/build.prop" ]; then
+    log "Auto-config: --pull-libs  (no cached libraries)"
+    PULL_LIBS=true
+  else
+    HOST_FINGERPRINT=$(get_build_fingerprint_from "$PULL_LIBS_DIR/build.prop")
+    log "Host build fingerprint:   $HOST_FINGERPRINT"
+    if [ "$HOST_FINGERPRINT" == "$DEVICE_FINGERPRINT" ]; then
+      log "Auto-config: --no-pull-libs (fingerprint match)"
+      NO_PULL_LIBS=true
+    else
+      log "Auto-config: --pull-libs  (fingerprint mismatch)"
+      PULL_LIBS=true
+    fi
+  fi
+fi
+
+# Extract the system libraries from the device if necessary.
+if [ "$PULL_LIBS" -a -z "$NO_PULL_LIBS" ]; then
+  echo "Extracting system libraries into: $PULL_LIBS_DIR"
+fi
+
+mkdir -p "$PULL_LIBS_DIR"
+fail_panic "Can't create --libs-dir directory: $PULL_LIBS_DIR"
+
+# If requested, work for M-x gdb.  The gdb indirections make it
+# difficult to pass --annotate=3 to the gdb binary itself.
+GDB_ARGS=
+if [ "$ANNOTATE" ]; then
+  GDB_ARGS=$GDB_ARGS" --annotate=$ANNOTATE"
+fi
+
+# Get the PID from the first argument or else find the PID of the
+# browser process.
+if [ -z "$PID" ]; then
+  PROCESSNAME=$PACKAGE_NAME
+  if [ "$SANDBOXED_INDEX" ]; then
+    PROCESSNAME=$PROCESSNAME:sandboxed_process$SANDBOXED_INDEX
+  elif [ "$SANDBOXED" ]; then
+    PROCESSNAME=$PROCESSNAME:sandboxed_process
+    PID=$(adb_shell ps | \
+          awk '$9 ~ /^'$PROCESSNAME'/ { print $2; }' | head -1)
+  fi
+  if [ -z "$PID" ]; then
+    PID=$(adb_shell ps | \
+          awk '$9 == "'$PROCESSNAME'" { print $2; }' | head -1)
+  fi
+  if [ -z "$PID" ]; then
+    if [ "$START" ]; then
+      panic "Can't find application process PID, did it crash?"
+    else
+      panic "Can't find application process PID, are you sure it is \
+running? Try using --start."
+    fi
+  fi
+  log "Found process PID: $PID"
+elif [ "$SANDBOXED" ]; then
+  echo "WARNING: --sandboxed option ignored due to use of --pid."
+fi
+
+# Determine if 'adb shell' runs as root or not.
+# If so, we can launch gdbserver directly, otherwise, we have to
+# use run-as $PACKAGE_NAME ..., which requires the package to be debuggable.
+#
+SHELL_UID=$(adb shell cat /proc/self/status | \
+            awk '$1 == "Uid:" { print $2; }')
+log "Shell UID: $SHELL_UID"
+COMMAND_PREFIX=
+if [ "$SHELL_UID" != 0 -o -n "$NO_ROOT" ]; then
+  log "Using run-as $PACKAGE_NAME to run without root."
+  COMMAND_PREFIX="run-as $PACKAGE_NAME"
+fi
+
+# Pull device's system libraries that are mapped by our process.
+# Pulling all system libraries is too long, so determine which ones
+# we need by looking at /proc/$PID/maps instead
+if [ "$PULL_LIBS" -a -z "$NO_PULL_LIBS" ]; then
+  echo "Extracting system libraries into: $PULL_LIBS_DIR"
+  SYSTEM_LIBS=$(adb_shell $COMMAND_PREFIX cat /proc/$PID/maps | \
+                awk '$6 ~ /\/system\/.*\.so$/ { print $6; }' | sort -u)
+  for SYSLIB in /system/bin/linker $SYSTEM_LIBS; do
+    echo "Pulling from device: $SYSLIB"
+    DST_FILE=$PULL_LIBS_DIR$SYSLIB
+    DST_DIR=$(dirname "$DST_FILE")
+    mkdir -p "$DST_DIR" && adb pull $SYSLIB "$DST_FILE" 2>/dev/null
+    fail_panic "Could not pull $SYSLIB from device !?"
+  done
+  echo "Pulling device build.prop"
+  adb pull /system/build.prop $PULL_LIBS_DIR/build.prop
+  fail_panic "Could not pull device build.prop !?"
+fi
+
+# Find all the sub-directories of $PULL_LIBS_DIR, up to depth 4
+# so we can add them to solib-search-path later.
+SOLIB_DIRS=$(find $PULL_LIBS_DIR -mindepth 1 -maxdepth 4 -type d | \
+             grep -v "^$" | tr '\n' ':')
+
+# This is a re-implementation of gdbclient, where we use compatible
+# versions of gdbserver and $GDBNAME to ensure that everything works
+# properly.
+#
+
+# Push gdbserver to the device
+log "Pushing gdbserver to $TARGET_GDBSERVER"
+adb push $GDBSERVER $TARGET_GDBSERVER &>/dev/null
+fail_panic "Could not copy gdbserver to the device!"
+
+PORT=5039
+HOST_PORT=$PORT
+TARGET_PORT=$PORT
+
+# Pull the app_process binary from the device
+GDBEXEC=app_process
+log "Pulling $GDBEXEC from device"
+adb pull /system/bin/$GDBEXEC "$TMPDIR"/$GDBEXEC &>/dev/null
+fail_panic "Could not retrieve $GDBEXEC from the device!"
+
+# Setup network redirection
+log "Setting network redirection (host:$HOST_PORT -> device:$TARGET_PORT)"
+adb forward tcp:$HOST_PORT tcp:$TARGET_PORT
+fail_panic "Could not setup network redirection from \
+host:localhost:$HOST_PORT to device:localhost:$TARGET_PORT!"
+
+# Start gdbserver in the background
+# Note that using run-as requires the package to be debuggable.
+#
+# If not, this will fail horribly. The alternative is to run the
+# program as root, which requires of course root privileges.
+# Maybe we should add a --root option to enable this?
+#
+log "Starting gdbserver in the background:"
+GDBSERVER_LOG=$TMPDIR/gdbserver-$TMP_ID.log
+log "adb shell $COMMAND_PREFIX $TARGET_GDBSERVER :$TARGET_PORT \
+--attach $PID"
+("$ADB" shell $COMMAND_PREFIX $TARGET_GDBSERVER :$TARGET_PORT \
+ --attach $PID > $GDBSERVER_LOG 2>&1) &
+GDBSERVER_PID=$!
+echo "$GDBSERVER_PID" > $GDBSERVER_PIDFILE
+log "background job pid: $GDBSERVER_PID"
+
+# Check that it is still running after a few seconds. If not, this means we
+# could not properly attach to it
+sleep 2
+log "Job control: $(jobs -l)"
+STATE=$(jobs -l | awk '$2 == "'$GDBSERVER_PID'" { print $3; }')
+if [ "$STATE" != "Running" ]; then
+  echo "ERROR: GDBServer could not attach to PID $PID!"
+  echo "Failure log (use --verbose for more information):"
+  cat $GDBSERVER_LOG
+  exit 1
+fi
+
+# Generate a file containing useful GDB initialization commands
+readonly COMMANDS=$TMPDIR/gdb.init
+log "Generating GDB initialization commands file: $COMMANDS"
+echo -n "" > $COMMANDS
+echo "file $TMPDIR/$GDBEXEC" >> $COMMANDS
+echo "directory $CHROMIUM_SRC" >> $COMMANDS
+echo "set solib-absolute-prefix $PULL_LIBS_DIR" >> $COMMANDS
+echo "set solib-search-path $SOLIB_DIRS:$PULL_LIBS_DIR:$SYMBOL_DIR" \
+    >> $COMMANDS
+echo "echo Attaching and reading symbols, this may take a while.." \
+    >> $COMMANDS
+echo "target remote :$HOST_PORT" >> $COMMANDS
+
+if [ "$GDBINIT" ]; then
+  cat "$GDBINIT" >> $COMMANDS
+fi
+
+if [ "$VERBOSE" -gt 0 ]; then
+  echo "### START $COMMANDS"
+  cat $COMMANDS
+  echo "### END $COMMANDS"
+fi
+
+log "Launching gdb client: $GDB $GDBARGS -x $COMMANDS"
+$GDB $GDBARGS -x $COMMANDS &&
+rm -f "$GDBSERVER_PIDFILE"
+
+clean_exit $?