opcode-gen/opcode-gen

#!/bin/bash
#
# Copyright (C) 2007 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.

# opcode-gen <file>
#
# This script uses the file bytecodes.txt (in this directory) to
# generate code inside the given <file>, based on the directives found
# in that file. Refer to those files to understand what's being
# generated. (Look for comments that say "BEGIN(name)" where "name" is
# one of the "emission" directives defined in opcode-gen.awk in this
# directory.)

file="$1"
tmpfile="/tmp/$$.txt"

echo "processing `basename $1`" 1>&2

if [ "x$1" = "x" ]; then
    echo "must specify a file" 1>&2
    exit 1
fi

# Set up prog to be the path of this script, including following symlinks,
# and set up progdir to be the fully-qualified pathname of its directory.
prog="$0"
while [ -h "${prog}" ]; do
    newProg=`/bin/ls -ld "${prog}"`
    newProg=`expr "${newProg}" : ".* -> \(.*\)$"`
    if expr "x${newProg}" : 'x/' >/dev/null; then
        prog="${newProg}"
    else
        progdir=`dirname "${prog}"`
        prog="${progdir}/${newProg}"
    fi
done
oldwd=`pwd`
progdir=`dirname "${prog}"`
cd "${progdir}"
progdir=`pwd`
prog="${progdir}"/`basename "${prog}"`
cd "${oldwd}"

bytecodeFile="$progdir/bytecode.txt"

awk -v "bytecodeFile=$bytecodeFile" -f "$progdir/opcode-gen.awk" \
    "$file" > "$tmpfile"

if [ "$?" = "0" ]; then
    cp "$tmpfile" "$file"
    rm "$tmpfile"
else
    echo "error running awk" 1>&2
    exit 1
fi