[ddc] Create new result.dart library

This is a step towards organizing the code from shared_command.dart and
eventually deleting it.

- Move `CompilerResult` from shared_command.dart.

Change-Id: Ibe4b8bbd5c6deb2558392255f3818773fa4ea80e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/388049
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>

pkg/dev_compiler/lib/ddc.dart

@@ -16,6 +16,7 @@ import 'package:bazel_worker/bazel_worker.dart';
 import 'package:kernel/ast.dart' show clearDummyTreeNodesParentPointer;
 
 import 'src/command/arguments.dart';
+import 'src/command/result.dart';
 import 'src/compiler/shared_command.dart';
 import 'src/kernel/command.dart';
 import 'src/kernel/expression_compiler_worker.dart';

pkg/dev_compiler/lib/src/command/result.dart

@@ -0,0 +1,37 @@
+// 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:front_end/src/api_unstable/ddc.dart'
+    show InitializedCompilerState;
+
+/// The result of a single `dartdevc` compilation.
+///
+/// Typically used for exiting the process with [exitCode] or checking the
+/// [success] of the compilation.
+///
+/// For batch/worker compilations, the [compilerState] provides an opportunity
+/// to reuse state from the previous run, if the options/input summaries are
+/// equivalent. Otherwise it will be discarded.
+class CompilerResult {
+  /// Optionally provides the front_end state from the previous compilation,
+  /// which can be passed to [compile] to potentially speed up the next
+  /// compilation.
+  final InitializedCompilerState? kernelState;
+
+  /// The process exit code of the compiler.
+  final int exitCode;
+
+  CompilerResult(this.exitCode, {this.kernelState});
+
+  /// Gets the kernel compiler state, if any.
+  Object? get compilerState => kernelState;
+
+  /// Whether the program compiled without any fatal errors (equivalent to
+  /// [exitCode] == 0).
+  bool get success => exitCode == 0;
+
+  /// Whether the compiler crashed (i.e. threw an unhandled exception,
+  /// typically indicating an internal error in DDC itself or its front end).
+  bool get crashed => exitCode == 70;
+}

pkg/dev_compiler/lib/src/compiler/shared_command.dart

@@ -6,8 +6,6 @@ import 'dart:io';
 
 import 'package:front_end/src/api_prototype/macros.dart' as macros
     show isMacroLibraryUri;
-import 'package:front_end/src/api_unstable/ddc.dart'
-    show InitializedCompilerState;
 import 'package:path/path.dart' as p;
 
 // TODO(nshahan) Merge all of this file the locations where they are used in
@@ -121,34 +119,3 @@ Map<String, Object?> placeSourceMap(Map<String, Object?> sourceMap,
       map['file'] != null ? makeRelative(map['file'] as String) : null;
   return map;
 }
-
-/// The result of a single `dartdevc` compilation.
-///
-/// Typically used for exiting the process with [exitCode] or checking the
-/// [success] of the compilation.
-///
-/// For batch/worker compilations, the [compilerState] provides an opportunity
-/// to reuse state from the previous run, if the options/input summaries are
-/// equivalent. Otherwise it will be discarded.
-class CompilerResult {
-  /// Optionally provides the front_end state from the previous compilation,
-  /// which can be passed to [compile] to potentially speed up the next
-  /// compilation.
-  final InitializedCompilerState? kernelState;
-
-  /// The process exit code of the compiler.
-  final int exitCode;
-
-  CompilerResult(this.exitCode, {this.kernelState});
-
-  /// Gets the kernel compiler state, if any.
-  Object? get compilerState => kernelState;
-
-  /// Whether the program compiled without any fatal errors (equivalent to
-  /// [exitCode] == 0).
-  bool get success => exitCode == 0;
-
-  /// Whether the compiler crashed (i.e. threw an unhandled exception,
-  /// typically indicating an internal error in DDC itself or its front end).
-  bool get crashed => exitCode == 70;
-}

pkg/dev_compiler/lib/src/kernel/command.dart

@@ -21,6 +21,7 @@ import 'package:source_maps/source_maps.dart' show SourceMapBuilder;
 
 import '../command/arguments.dart';
 import '../command/options.dart';
+import '../command/result.dart';
 import '../compiler/js_names.dart' as js_ast;
 import '../compiler/module_builder.dart';
 import '../compiler/shared_command.dart';