Script to help parse javac commandline

#!/bin/bash

# Copyright (C) 2024 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.

# Script to help parse java command line options.

#

# Useful to use it in a "soong-rerun" script generated by

# extract-last-soong-commands.py.

#

# Usage:

#

#   A javac invocation in a  soong-rerun script contains looks like this:

#

#   -----------------------------

#   out/host/linux-x86/bin/soong_javac_wrapper prebuilts/jdk/jdk21/linux-x86/bin/javac [JAVAC OPTIONS...]

#   -----------------------------

#

#   Just inject this script like so, between "soong_javac_wrapper" and the actual javac command:

#   -----------------------------

#   out/host/linux-x86/bin/soong_javac_wrapper $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/javac-arg-dumper.sh prebuilts/jdk/jdk21/linux-x86/bin/javac ...

#   -----------------------------

#

# Then run the rerun script.

javac="$1"

shift

options=("$@")

echo "JAVAC: $javac"

dump_array() {

    local prefix="$1"   # Prefix for the output.

    local toplevel="$2" # 1 for a "toplevel" dump. 0 for nested dump.

    shift 2

    local arg

    for arg in "$@"; do

        # Print each argument with shell-escaping.

        echo "${prefix}${arg%Q}"

        # If the argument is a jar file and it exists, print its content.

        # (if it contains multiple jar files joined with ':'s, then it'll

        # fail the -f test. In that case, we'll dump each jar in a nested dump.)

        if [[ "$arg" =~ \.jar$ ]] && [[ -f "$arg" ]] ; then

            echo "      jar tf $arg"

            jar tf "$arg" | sed -e 's/^/        /'

        fi

        # If we're at the toplevel, we want to do extra dump.

        if ! (( $toplevel )) ; then

            continue

        fi

        # If it's a a *.rsp file, print its content.

        if [[ "$arg" =~ ^@ ]] ; then

            local rsp_file=${arg:1}

            sed -e 's/^/    RSP: /' "$rsp_file"

            continue

        fi

        # If the argument contains ':', then split it and do a nested dump.

        if [[ "$arg" =~ : ]] ; then

            dump_array "    SPLIT: " 0 $(tr -s ':' ' ' <<<"$arg")

            continue

        fi

    done

}

# Dump the arguments.

dump_array "ARG: " 1 "${options[@]}"

# Use `export JAVA_ARG_DUMPER_DRY=1` if you don't want to run javac.

if (( $JAVA_ARG_DUMPER_DRY )) ; then

    echo

    echo "Dry-run, not running javac." 1>&2

    exit 13

fi

echo-and-exec() {

    echo "$@"

    exec "$@"

}

echo-and-exec "$javac" "${options[@]}"