Bytecode compiler

Add dart2bytecode tool which takes Dart sources and produces
Dart bytecode. The tool uses common front-end (CFE) to parse Dart
source code and contains bytecode generator which translates
kernel AST to bytecode.

Change-Id: I90bd6e72c619cf0edc556da0640760b30e81091d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/378560
Commit-Queue: Alexander Markov <[email protected]>
Reviewed-by: Slava Egorov <[email protected]>

Author: alexmarkov

pkg/dart2bytecode/OWNERS

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+set noparent
+file:/tools/OWNERS_VM
+# In addition to VM team allow global owners.
+file:/OWNERS

pkg/dart2bytecode/README.md

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+This package contains Dart bytecode compiler.
+
+## Status: experimental
+
+**NOTE**: This package is currently experimental and not published or
+included in the SDK.
+
+Do not take dependency on this package unless you are prepared for
+breaking changes and possibly removal of this code at any point in time.

pkg/dart2bytecode/analysis_options.yaml

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+# Copyright (c) 2024, 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.
+
+include: package:lints/core.yaml

pkg/dart2bytecode/bin/dart2bytecode.dart

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+// Copyright (c) 2024, 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.
+
+import 'package:dart2bytecode/dart2bytecode.dart' as dart2bytecode;
+
+Future<void> main(List<String> args) async {
+  await dart2bytecode.main(args);
+}

pkg/dart2bytecode/bin/dump_bytecode.dart

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+// Copyright (c) 2024, 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.
+
+import 'dart:io';
+
+import 'package:dart2bytecode/bytecode_serialization.dart'
+    show LinkReader, BufferedReader;
+import 'package:dart2bytecode/declarations.dart' show Component;
+
+final String _usage = '''
+Usage: dump_bytecode input.bytecode
+Dumps bytecode file.
+''';
+
+main(List<String> arguments) async {
+  if (arguments.length != 1) {
+    print(_usage);
+    exit(1);
+  }
+
+  final input = arguments[0];
+
+  final List<int> bytes = File(input).readAsBytesSync();
+
+  final linkReader = LinkReader();
+  final reader = BufferedReader(linkReader, bytes);
+  final bytecodeComponent = Component.read(reader);
+  print(bytecodeComponent.toString());
+}