#!/bin/bash
#
# Usage:
#   ./asan.sh <function name>
#
# Trigger ASAN failures like this:
#
# int *array = malloc(100);
# free(array);
# fprintf(stderr, "C = %c\n", array[0]);

set -o nounset
set -o pipefail
set -o errexit

CFLAGS='-Wno-uninitialized -g'
#CFLAGS="$CFLAGS -g"  # for debugging

# On Ubuntu Trusty

# You can get things like this if versions don't match.
#
# clang 3.4:
# Segmentation Fault

# clang 3.6:
#
# $ ./toybox
# ==14123==Your application is linked against incompatible ASan runtimes.
#
# Do I have to build my own clang?  That's annoying.  It's up to 3.9 though.

install-clang() {
  sudo apt install clang libasan0
}

readonly CLANG_DIR=~/install/clang+llvm-3.8.0-x86_64-linux-gnu-ubuntu-14.04
readonly CLANG=$CLANG_DIR/bin/clang

clang-version() {
  $CLANG --version
}

# clang-3.6 is called clang-3.6 for some reason
#readonly CLANG=clang  

build-clang() {
  make CC=$CLANG CFLAGS="$CFLAGS"
}

build-asan() {
  # tons of -Wuninitialized stuff
  make CC=$CLANG CFLAGS="-fsanitize=address $CFLAGS" V=1
  # LDFLAGS='-lasan' 
  #V=1
}

test-command() {
  local cmd=${1:-sed}
  # OOPS, TEST_HOST tests the GNU stuff!  Whatever is on the host.
  # We need another mode.
  #
  # But this reveals differences with GNU sed!

  # This invokes scripts/test.sh sed.
  # scripts/single.sh sed -- Why does this configure a single command?
  # And this calls "make"

  # Woohoo!  This works.  Ig et line numbers.
  export ASAN_SYMBOLIZER_PATH=$CLANG_DIR/bin/llvm-symbolizer
  ls -l $ASAN_SYMBOLIZER_PATH

  # NOTE: This requires my patch to scripts/single.sh
  make VERBOSE=fail CC=$CLANG CFLAGS="-fsanitize=address $CFLAGS" test_$cmd
}

sed-cases() {
  # toybox transforms abc -> db\f
  # GNU sed transforms abc -> de\f  -- this seems wrong because \b is an
  # escape?
  echo ---
  echo -ne 'abc' | "$@" 'y/a\bc/de\f/'

  # This seems to be on purpose?
  # commit 2081ec658cdedc7bc6693c8353874dcaf48e9b1b
  # Author: Rob Landley <rob@landley.net>
  # Date:   Thu Jan 21 13:04:51 2016 -0600
  # 
  #     Add a sed test from the posix mailing list.

  echo ---
  echo -ne 'a\nb\n' | "$@" -e n -e '1,2s/b/c/'
}

sed-compare() {
  echo TOYBOX
  sed-cases ./toybox sed
  echo

  echo GNU
  sed-cases sed

  # Same results
  #echo GNU posix
  #sed-cases sed --posix
}

"$@"