#!/usr/bin/env bash
############################################################################
# apps/tools/mksymtab.sh
#
#   Copyright (C) 2018 Gregory Nutt. All rights reserved.
#   Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
# 3. Neither the name NuttX nor the names of its contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
############################################################################

export LC_ALL=C

usage="Usage: $0 <imagedirpath> [symtabprefix]"

# Check for the required directory path

dir=$1
if [ -z "$dir" ]; then
  echo "ERROR: Missing <imagedirpath>"
  echo ""
  echo $usage
  exit 1
fi

# Get the symbol table prefix

prefix=$2

# Extract all of the undefined symbols from the ELF files and create a
# list of sorted, unique undefined variable names.

varlist=`find $dir -name *-thunk.S 2>/dev/null | xargs grep -h asciz | cut -f3 | sort | uniq`
if [ -z "$varlist" ]; then
  execlist=`find $dir -type f -perm -a=x 2>/dev/null`
  if [ ! -z "$execlist" ]; then
    varlist=`nm $execlist | fgrep ' U ' | sed -e "s/^[ ]*//g" | cut -d' ' -f2 | sort | uniq`
  fi
fi

# Now output the symbol table as a structure in a C source file.  All
# undefined symbols are declared as void* types.  If the toolchain does
# any kind of checking for function vs. data objects, then this could
# failed

echo "#include <nuttx/compiler.h>"
echo "#include <nuttx/symtab.h>"
echo ""

for var in $varlist; do
  echo "extern void *${var};"
done

echo ""
if [ -z "$prefix" ]; then
  echo "#if defined(CONFIG_EXECFUNCS_HAVE_SYMTAB)"
  echo "const struct symtab_s CONFIG_EXECFUNCS_SYMTAB_ARRAY[] = "
  echo "#elif defined(CONFIG_SYSTEM_NSH_SYMTAB)"
  echo "const struct symtab_s CONFIG_SYSTEM_NSH_SYMTAB_ARRAYNAME[] = "
  echo "#else"
  echo "const struct symtab_s dummy_symtab[] = "
  echo "#endif"
else
  echo "const struct symtab_s ${prefix}_exports[] = "
fi
echo "{"

for var in $varlist; do
  echo "  {\"${var}\", &${var}},"
done

echo "};"
echo ""
if [ -z "$prefix" ]; then
  echo "#if defined(CONFIG_EXECFUNCS_HAVE_SYMTAB)"
  echo "const int CONFIG_EXECFUNCS_NSYMBOLS_VAR = sizeof(CONFIG_EXECFUNCS_SYMTAB_ARRAY) / sizeof(struct symtab_s);"
  echo "#elif defined(CONFIG_SYSTEM_NSH_SYMTAB)"
  echo "const int CONFIG_SYSTEM_NSH_SYMTAB_COUNTNAME = sizeof(CONFIG_SYSTEM_NSH_SYMTAB_ARRAYNAME) / sizeof(struct symtab_s);"
  echo "#else"
  echo "const int dummy_nsymtabs = sizeof(dummy_symtab) / sizeof(struct symtab_s);"
  echo "#endif"
else
  echo "const int ${prefix}_nexports = sizeof(${prefix}_exports) / sizeof(struct symtab_s);"
fi