#!/bin/bash

set -e

if [ -z "$LLVM_PROFILE_FILE" ]; then
    echo "This script is meant to be run inside with_coverage" >&2
    exit 1
fi

coverage_dir=$(dirname "$LLVM_PROFILE_FILE")

TOPDIR=$(realpath "$(dirname "$0")/..")
cd "$TOPDIR"

# for some reason, compiling with coverage is very slow, especially for curve25519-dalek,
# and mixing normal runs and coverage runs trash the cache. Here we set an alternative
# target directory so it's possible to reuse cached artifacts between coverage runs.
export CARGO_TARGET_DIR=${CARGO_TARGET_DIR:-target-coverage}

# remove comments starting with #@ to run in parallel. This makes output very messy, uses a lot more
# ram and make the load average go crazy, but it's also way faster both to compile (due to 
# curve25519-dalek compilation being so slow, and it using a single core), and to run because it's
# essentially monothreaded too.
for d in ./crates/*/fuzz; do
    #@{
        pushd "$(dirname "$d")"
        crate=$(basename "$(dirname "$d")")
        mkdir -p "$TOPDIR/target/debug/$crate"
        mkdir -p "$coverage_dir/$crate"
        for fuzzer in $(cargo fuzz list); do
            cargo fuzz coverage "$fuzzer"

            # we copy binary and coverage data where with_coverage expect it to be
            cp "target-coverage/x86_64-unknown-linux-gnu/release/$fuzzer" "$TOPDIR/target/debug/$crate/$fuzzer"
            mv "fuzz/coverage/$fuzzer/raw" "$coverage_dir/$crate/$fuzzer"
        done
        popd
    #@}&
done

#@for d in ./crates/*/fuzz; do
#@    wait
#@done