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Dart: build flute directly from dart-lang/flute with Dart 3.14.0-315.3.beta #333

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Dart: build flute directly from dart-lang/flute with Dart 3.14.0-315.3.beta #333

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4 changes: 3 additions & 1 deletion workloads/Dart/.gitignore
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@@ -1 +1,3 @@
/wasm_gc_benchmarks/
/flute/
/dart-sdk/
/dartsdk.zip
5 changes: 2 additions & 3 deletions workloads/Dart/README.md
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Expand Up @@ -5,9 +5,8 @@ This is a WasmGC build of the `flute` benchmark, a Dart application using the
It performs the Wasm/compute-only part of rendering a certain number of frames.
Since JetStream runs in JS engine shells, the actual rendering to a Canvas is
stubbed out.
The upstream repository containing pre-built WebAssembly binaries (which we
use here) is at https://github.com/mkustermann/wasm_gc_benchmarks.
The Dart source code of the flute application is at https://github.com/dart-lang/flute.
The benchmark harness (`addTaskQueue`) in `benchmark.js` comes from https://github.com/mkustermann/wasm_gc_benchmarks,
and `build.sh` compiles the WasmGC binaries directly from https://github.com/dart-lang/flute.

## Build Instructions

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21 changes: 16 additions & 5 deletions workloads/Dart/build.log
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Built on Thu Aug 14 04:47:37 PM CEST 2025
Cloning into 'wasm_gc_benchmarks'...
13951e1 Roll new version of flute and regenerate flute-based benchmarks
Copying files from wasm_gc_benchmarks/ into build/
Build success
Built on 2026-11-03T17:54:12Z
Downloading Dart SDK 3.14.0-315.3.beta (linux-x64)...
Toolchain versions
Dart SDK version: 3.14.0-315.3.beta (beta) (Thu Oct 22 14:42:43 2026 -0700) on "linux_x64"
Getting sources...
flute commit:
712764b Bump the github-actions group with 2 updates
Getting Dart dependencies...
Resolving dependencies...
Downloading packages...
Got dependencies!
Compiling flute.complex to wasm...
Generated wasm module '../../build/flute.complex.dart2wasm.wasm', and JS init file '../../build/flute.complex.dart2wasm.mjs'.
Compiling flute.todomvc to wasm...
Generated wasm module '../../build/flute.todomvc.dart2wasm.wasm', and JS init file '../../build/flute.todomvc.dart2wasm.mjs'.
Build success
62 changes: 50 additions & 12 deletions workloads/Dart/build.sh
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set -eo pipefail

# Dart 3.14 emits standard Wasm exception handling (`try_table`) by default
# (https://github.com/dart-lang/sdk/issues/54394).
# TODO: Switch DART_CHANNEL="stable" and DART_SDK_VERSION="3.14.0" once Dart
# 3.14 stable ships.
DART_CHANNEL="beta"
DART_SDK_VERSION="3.14.0-315.3.beta"
FLUTE_COMMIT="712764b186549d919a31d2fc8cc9da4e9a633eb3"

# Cleanup old files.
rm -rf wasm_gc_benchmarks/
rm -rf flute/ dart-sdk/ dartsdk.zip
rm -rf build/

BUILD_LOG="$(realpath build.log)"
echo -e "Built on $(date)" | tee "$BUILD_LOG"
echo -e "Built on $(date -u '+%Y-%m-%dT%H:%M:%SZ')" | tee "$BUILD_LOG"

case "$(uname -s)-$(uname -m)" in
Linux-x86_64) DART_PLATFORM="linux-x64" ;;
Linux-aarch64) DART_PLATFORM="linux-arm64" ;;
Darwin-x86_64) DART_PLATFORM="macos-x64" ;;
Darwin-arm64) DART_PLATFORM="macos-arm64" ;;
*) echo "Unsupported platform: $(uname -s)-$(uname -m)" >&2; exit 1 ;;
esac

echo "Downloading Dart SDK $DART_SDK_VERSION ($DART_PLATFORM)..." | tee -a "$BUILD_LOG"
curl -sSf -o dartsdk.zip "https://storage.googleapis.com/dart-archive/channels/$DART_CHANNEL/release/$DART_SDK_VERSION/sdk/dartsdk-$DART_PLATFORM-release.zip"
unzip -q dartsdk.zip
rm dartsdk.zip
DART_BIN="$(realpath dart-sdk/bin/dart)"
"$DART_BIN" --disable-analytics >/dev/null 2>&1 || true

git clone https://github.com/mkustermann/wasm_gc_benchmarks 2>&1 | tee -a "$BUILD_LOG"
pushd wasm_gc_benchmarks/
echo "Toolchain versions" | tee -a "$BUILD_LOG"
"$DART_BIN" --version 2>&1 | tee -a "$BUILD_LOG"

echo "Getting sources..." | tee -a "$BUILD_LOG"
git clone -q https://github.com/dart-lang/flute.git flute 2>&1 | tee -a "$BUILD_LOG"
pushd flute/
git checkout -q "$FLUTE_COMMIT"
echo "flute commit:" | tee -a "$BUILD_LOG"
git log -1 --oneline | tee -a "$BUILD_LOG"

pushd benchmarks/
echo "Getting Dart dependencies..." | tee -a "$BUILD_LOG"
"$DART_BIN" pub get 2>&1 | tee -a "$BUILD_LOG"

# Same flags as `wasm_gc_benchmarks/compile.sh`, which built the JetStream 3.0
# binaries. -O2 is also what `flutter build web --wasm` uses for release builds,
# and --no-strip-wasm keeps the name section for profiling.
mkdir -p ../../build/
echo "Compiling flute.complex to wasm..." | tee -a "$BUILD_LOG"
"$DART_BIN" compile wasm -Ddart.vm.product=true -O2 --no-strip-wasm -o ../../build/flute.complex.dart2wasm.wasm lib/complex.dart 2>&1 | tee -a "$BUILD_LOG"

echo "Compiling flute.todomvc to wasm..." | tee -a "$BUILD_LOG"
"$DART_BIN" compile wasm -Ddart.vm.product=true -O2 --no-strip-wasm -o ../../build/flute.todomvc.dart2wasm.wasm lib/todomvc.dart 2>&1 | tee -a "$BUILD_LOG"
popd
popd

echo "Copying files from wasm_gc_benchmarks/ into build/" | tee -a "$BUILD_LOG"
mkdir -p build/ | tee -a "$BUILD_LOG"
# Two Flute benchmark applications: complex and todomvc
cp wasm_gc_benchmarks/benchmarks-out/flute.complex.dart2wasm.{mjs,wasm} build/ | tee -a "$BUILD_LOG"
cp wasm_gc_benchmarks/benchmarks-out/flute.todomvc.dart2wasm.{mjs,wasm} build/ | tee -a "$BUILD_LOG"
# The benchmark only needs the .wasm and .mjs files.
rm -f build/*.support.js build/*.wasm.map

echo "Build success" | tee -a "$BUILD_LOG"

# TODO: We could actually build the application/benchmark from Dart sources with
# the dart2wasm compiler / Dart SDK. See `wasm_gc_benchmarks/compile.sh`
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