pkg/dart2wasm/tool/compile_benchmark

#!/usr/bin/env bash
# Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

# Script to compile a benchmark using dart2wasm. Assumes the Dart repo's
# directory structure.

set -e

function follow_links() {
  file="$1"
  while [ -h "$file" ]; do
    # On Mac OS, readlink -f doesn't work.
    file="$(readlink "$file")"
  done
  echo "$file"
}

# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
PROG_NAME="$(follow_links "$BASH_SOURCE")"

# Handle the case where dart-sdk/bin has been symlinked to.
PROG_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
SDK_DIR="$(cd "${PROG_DIR}/../../.." ; pwd -P)"

# Locate build directory, containing executables, snapshots and platform dill.
if [[ `uname` == 'Darwin' ]]; then
  OUT_DIR="$SDK_DIR/xcodebuild"
else
  OUT_DIR="$SDK_DIR/out"
fi
DART_CONFIGURATION=${DART_CONFIGURATION:-ReleaseX64}
BIN_DIR="$OUT_DIR/$DART_CONFIGURATION"

DART2WASM="$SDK_DIR/sdk/bin/dart2wasm"
BINARYEN="$BIN_DIR/wasm-opt"

TEMPDIR="$(mktemp -d)"
TEMPFILE="$(mktemp -p "$TEMPDIR" --suffix=.wasm)"

COMPILE_FLAGS="--enable-experiment=records,patterns"
if [[ "$3" == "--omit-checks" ]]; then
  COMPILE_FLAGS+=" --omit-type-checks"
fi

"$DART2WASM" "$1" "$TEMPFILE" $COMPILE_FLAGS
"$BINARYEN" -all --closed-world -tnh -O3 --type-ssa --gufa -O3 --type-merging "$TEMPFILE" -o "$2"

# Locate JS runtime and copy it to the same directory as "$2". We also rename it
# using the basename of "$2".
cp "${TEMPFILE%.*}.mjs" "$(dirname "$2")"/"$(basename ${2%.*}.mjs)"

# Clean up temporary files.
rm -r "$TEMPDIR"