#!/bin/sh
# test an input to see if it exhibits a given error message


# ---------------------- setup --------------------
usage() {
  echo "usage: msg=message_fragment $0 [-v]"
  echo "  This script tests tmp.i to see if it:"
  echo "    - goes through gcc, and"
  echo "    - provokes an error from ccparse, where"
  echo "    - the error message matches the fragment regexp"
  echo "  Use the special msg \"segfault\" to test for a segfault (SIGSEGV),"
  echo "  and \"abort\" to test for a SIGABRT."
}

# verbose operation?
verbose=false
if [ "$1" = "-v" ]; then
  verbose=true
  shift
fi

# gcc to use
if [ "$GCC" = "" ]; then
  GCC=$HOME/opt/gcc-3.4.3/bin/g++
fi

# input file
input=tmp.i
if [ ! -f "$input" ]; then
  echo "error: $input does not exist"
  exit 2
fi

# error message fragment
if [ "$msg" = "" ]; then
  echo "error: must set \$msg to a message fragment regexp"
  usage
  exit 2
fi


# ---------------------- execution --------------------
if $verbose; then
  # leave outputs as they are
  true
else
  # trash all output
  exec >/dev/null 2>&1
fi

# limit resources; this is important because sometimes delta creates
# inputs that cause gcc to go into infinite loops
#   virtual memory: 500MB
#   time: 30s
ulimit -v 500000
ulimit -t 30

if [ "$DELTA_REQUIRED_STRING" != "" ]; then
  if grep "$DELTA_REQUIRED_STRING" tmp.i >/dev/null 2>&1; then
    echo "required string ($DELTA_REQUIRED_STRING) is present"
  else
    echo "required string ($DELTA_REQUIRED_STRING) is missing"
    exit 2
  fi
fi

# integrity check
if $GCC $ARGS -o /dev/null -c tmp.i; then
  echo "gcc ok"
else
  echo "did not pass gcc test"
  exit 2
fi

# ccparse
if [ "$msg" = "segfault" ]; then
  ./ccparse -tr permissive $ARGS tmp.i >/dev/null 2>&1
  if [ "$?" = "139" ]; then
    echo "got the segfault I am looking for"
    exit 0
  else
    echo "did not get a segfault"
    exit 4
  fi
elif [ "$msg" = "abort" ]; then
  ./ccparse -tr permissive $ARGS tmp.i >/dev/null 2>&1
  if [ "$?" = "134" ]; then
    echo "got the SIGABRT I am looking for"
    exit 0
  else
    echo "did not get a SIGABRT"
    exit 4
  fi
else
  if ./ccparse -tr permissive $ARGS tmp.i 2>&1 | grep "$msg"; then
    echo "found the error message I am looking for"
    exit 0
  else
    echo "didn't get the error I want"
    exit 4
  fi
fi