#!/bin/bash
# SPDX-License-Identifier: LGPL-3.0-or-later
# See Notices.txt for copyright information

set -e

function download_if_needed() {
    local dest="$1" hash="$2" url="$3"
    if [[ ! -f "$1" ]]; then
        wget -O "$dest" "$url"
    fi
    sha256sum -c <<<"$hash *$dest"
}

function build-qemu() (
    [[ -x "$QEMU_SOURCE/configure" ]] || tar -xJf "downloads/$QEMU_SOURCE.tar.xz"

    rm -rf "$QEMU_BUILD"
    mkdir -p "$QEMU_BUILD"
    cd "$QEMU_BUILD"
    export CC="clang-20 --target=powerpc64le-linux-gnu"
    export CXX="clang++-20 --target=powerpc64le-linux-gnu"
    export LDFLAGS="-fuse-ld=lld-20 -Wl,--lto-emit-llvm -Wl,--lto-O0"
    export AR="llvm-ar-20"
    "../$QEMU_SOURCE/configure" \
        --target-list=ppc64-softmmu \
        --enable-lto \
        --enable-tcg-interpreter \
        --without-default-features \
        --cross-prefix=powerpc64le-linux-gnu-
    make -j"$(nproc)" qemu-system-ppc64
    echo "copying bitcode"
    cp qemu-system-ppc64 ../qemu-system-ppc64.bc
    echo "disassembling bitcode"
    llvm-dis-20 -o ../qemu-system-ppc64.ll ../qemu-system-ppc64.bc
)

mkdir -p downloads

QEMU_SOURCE=qemu-10.2.2
QEMU_SOURCE_HASH=784b296ff29c1417aa72323abcb2d2ea9ab9771724f577dcd785c3b04f21e176
QEMU_BUILD="$QEMU_SOURCE-build"

download_if_needed "downloads/$QEMU_SOURCE.tar.xz" "$QEMU_SOURCE_HASH" \
    "https://download.qemu.org/$QEMU_SOURCE.tar.xz"

build-qemu