Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork."

tools/testing/dart/test_options.dart

Index: tools/testing/dart/test_options.dart
diff --git a/tools/testing/dart/test_options.dart b/tools/testing/dart/test_options.dart
index 255564ac5c1688a84428a97b19f7fa2333f0428a..e501d08ba58de1f6ed7e91b504bc47d078383e2d 100644
--- a/tools/testing/dart/test_options.dart
+++ b/tools/testing/dart/test_options.dart
@@ -26,6 +26,7 @@ const List<String> defaultTestSelectors = const [
   'pkg',
   'analyze_library',
   'service',
+  'kernel',
   'observatory_ui'
 ];
 
@@ -75,9 +76,15 @@ class TestOptionsParser {
 
    dart2app:
    dart2appjit: Compile the Dart code into an app snapshot before running test
-          (only valid with dart_app runtime)''',
+          (only valid with dart_app runtime)
+
+   dartk: Compile the Dart source into Kernel before running test.
+
+   dartkp: Compiler the Dart source into Kernel and then Kernel into AOT
+   snapshot before running the test.''',
           ['-c', '--compiler'],
-          ['none', 'precompiler', 'dart2js', 'dart2analyzer', 'dart2app', 'dart2appjit'],
+          ['none', 'precompiler', 'dart2js', 'dart2analyzer', 'dart2app',
+           'dart2appjit', 'dartk', 'dartkp'],
           'none'),
       // TODO(antonm): fix the option drt.
       new _TestOptionSpecification(
@@ -156,6 +163,16 @@ class TestOptionsParser {
           ],
           'x64'),
       new _TestOptionSpecification(
+          'kernel_transformers',
+          'The kernel transformations to apply in order (separated by comma). '
+          'A transformer can either be just a "name" (in which case it must be '
+          'available in kernel/bin/tansform.dart) or a "name:path" pair '
+          '(in which case "path" must point to an executable script which takes'
+          ' `input-file` and `output-file` as arguments).',
+          ['--kernel_transformers'],
+          [],
+          ''),
+      new _TestOptionSpecification(
           'system',
           'The operating system to run tests on',
           ['-s', '--system'],
@@ -677,6 +694,12 @@ Note: currently only implemented for dart2js.''',
       case 'precompiler':
         validRuntimes = const ['dart_precompiled'];
         break;
+      case 'dartk':
+        validRuntimes = const ['vm'];
+        break;
+      case 'dartkp':
+        validRuntimes = const ['dart_precompiled'];
+        break;
       case 'none':
         validRuntimes = const [
           'vm',
@@ -687,6 +710,13 @@ Note: currently only implemented for dart2js.''',
         ];
         break;
     }
+    var kernelCompilers = const ['dartk', 'dartkp'];
+    if (config['kernel_transformers']?.length > 0 &&
+        !kernelCompilers.contains(config['compiler'])) {
+      isValid = false;
+      print("Warning: The `--kernel_transformers` option can only be used in "
+            "combination with the ${kernelCompilers.join(', ')} compilers.");
+    }
     if (!validRuntimes.contains(config['runtime'])) {
       isValid = false;
       print("Warning: combination of compiler '${config['compiler']}' and "
@@ -838,9 +868,9 @@ Note: currently only implemented for dart2js.''',
     if (configuration['package_root'] == null &&
         configuration['packages'] == null) {
       configuration['packages'] =
-        TestUtils.dartDirUri.resolve('.packages').toFilePath();     
+        TestUtils.dartDirUri.resolve('.packages').toFilePath();
     }
-    
+
     // Expand the architectures.
     if (configuration['arch'].contains(',')) {
       return _expandHelper('arch', configuration);