dart2js cps: Always use interceptors and type tags for 'is' checks.

pkg/compiler/lib/src/js_backend/codegen/type_test_emitter.dart

Index: pkg/compiler/lib/src/js_backend/codegen/type_test_emitter.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/type_test_emitter.dart b/pkg/compiler/lib/src/js_backend/codegen/type_test_emitter.dart
deleted file mode 100644
index 959756f8e5b9316ec282a68116594432a46120f3..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/js_backend/codegen/type_test_emitter.dart
+++ /dev/null
@@ -1,92 +0,0 @@
-// Copyright (c) 2015, 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.
-
-part of code_generator;
-
-abstract class TypeTestEmitter {
-  giveup(node, reason);
-  Glue get glue;
-
-  js.Expression emitSubtypeTest(tree_ir.Node node,
-                                js.Expression value,
-                                DartType type) {
-    return glue.isNativePrimitiveType(type)
-        ? emitNativeSubtypeTest(node, value, type.element)
-        : emitGeneralSubtypeTest(node, value, type);
-  }
-
-  js.Expression emitNativeSubtypeTest(tree_ir.Node node,
-                                      js.Expression value,
-                                      ClassElement cls) {
-    if (glue.isIntClass(cls)) {
-      return _emitIntCheck(value);
-    } else if (glue.isStringClass(cls)) {
-      return _emitTypeofCheck(value, 'string');
-    } else if (glue.isBoolClass(cls)) {
-      return _emitTypeofCheck(value, 'boolean');
-    } else if (glue.isNumClass(cls) || glue.isDoubleClass(cls)) {
-      return _emitNumCheck(value);
-    } else {
-      return giveup(value, 'type check unimplemented for ${cls.name}.');
-    }
-  }
-
-  js.Expression _emitNativeListCheck(js.Expression value) {
-        return identical(
-            new js.PropertyAccess.field(value, 'constructor'),
-            new js.VariableUse('Array'));
-  }
-
-  js.Expression emitPropertyTypeTest(tree_ir.Node node,
-                                     js.Expression value,
-                                     InterfaceType type) {
-    return and(
-        boolify(value),
-        boolify(new js.PropertyAccess.field(value, glue.getTypeTestTag(type))));
-  }
-
-  js.Expression emitGeneralSubtypeTest(tree_ir.Node node,
-                                       js.Expression value,
-                                       InterfaceType type) {
-    if (glue.isListClass(type.element)) {
-      return or(_emitNativeListCheck(value),
-          emitPropertyTypeTest(node, value, type));
-    }
-    return emitPropertyTypeTest(node, value, type);
-  }
-
-  js.Expression _emitNumCheck(js.Expression value) {
-    return _emitTypeofCheck(value, 'number');
-  }
-
-  js.Expression _emitBigIntCheck(js.Expression value) {
-    return js.js('Math.floor(#) === #', [value, value]);
-  }
-
-  js.Expression _emitIntCheck(js.Expression value) {
-    return and(_emitNumCheck(value), _emitBigIntCheck(value));
-  }
-
-  js.Expression _emitTypeofCheck(js.Expression value, String type) {
-    return identical(new js.Prefix("typeof", value), js.string(type));
-  }
-
-  // Static helpers to generate common JavaScript expressions.
-
-  static js.Expression or(js.Expression left, js.Expression right) {
-    return new js.Binary('||', left, right);
-  }
-
-  static js.Expression and(js.Expression left, js.Expression right) {
-    return new js.Binary('&&', left, right);
-  }
-
-  static js.Expression identical(js.Expression left, js.Expression right) {
-    return new js.Binary('===', left, right);
-  }
-
-  static js.Expression boolify(js.Expression value) {
-    return new js.Prefix('!!', value);
-  }
-}