Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

sdk/lib/_internal/compiler/implementation/universe/side_effects.dart

-// Copyright (c) 2013, 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 universe;
-
-class SideEffects {
-  // Changes flags.
-  static const int FLAG_CHANGES_INDEX = 0;
-  static const int FLAG_CHANGES_INSTANCE_PROPERTY = FLAG_CHANGES_INDEX + 1;
-  static const int FLAG_CHANGES_STATIC_PROPERTY
-      = FLAG_CHANGES_INSTANCE_PROPERTY + 1;
-  static const int FLAG_CHANGES_COUNT = FLAG_CHANGES_STATIC_PROPERTY + 1;
-
-  // Depends flags (one for each changes flag).
-  static const int FLAG_DEPENDS_ON_INDEX_STORE = FLAG_CHANGES_COUNT;
-  static const int FLAG_DEPENDS_ON_INSTANCE_PROPERTY_STORE =
-      FLAG_DEPENDS_ON_INDEX_STORE + 1;
-  static const int FLAG_DEPENDS_ON_STATIC_PROPERTY_STORE =
-      FLAG_DEPENDS_ON_INSTANCE_PROPERTY_STORE + 1;
-  static const int FLAG_DEPENDS_ON_COUNT =
-      FLAG_DEPENDS_ON_STATIC_PROPERTY_STORE + 1;
-
-  int flags = 0;
-
-  SideEffects() {
-    setAllSideEffects();
-    setDependsOnSomething();
-  }
-
-  SideEffects.empty();
-
-  bool operator==(other) => flags == other.flags;
-
-  int get hashCode => throw new UnsupportedError('SideEffects.hashCode');
-
-  bool getFlag(int position) => (flags & (1 << position)) != 0;
-  void setFlag(int position) { flags |= (1 << position); }
-
-  int getChangesFlags() => flags & ((1 << FLAG_CHANGES_COUNT) - 1);
-  int getDependsOnFlags() {
-    return (flags & ((1 << FLAG_DEPENDS_ON_COUNT) - 1)) >> FLAG_CHANGES_COUNT;
-  }
-
-  bool hasSideEffects() => getChangesFlags() != 0;
-  bool dependsOnSomething() => getDependsOnFlags() != 0;
-
-  void setAllSideEffects() { flags |= ((1 << FLAG_CHANGES_COUNT) - 1); }
-
-  void clearAllSideEffects() { flags &= ~((1 << FLAG_CHANGES_COUNT) - 1); }
-
-  void setDependsOnSomething() {
-    int count = FLAG_DEPENDS_ON_COUNT - FLAG_CHANGES_COUNT;
-    flags |= (((1 << count) - 1) << FLAG_CHANGES_COUNT);
-  }
-  void clearAllDependencies() {
-    int count = FLAG_DEPENDS_ON_COUNT - FLAG_CHANGES_COUNT;
-    flags &= ~(((1 << count) - 1) << FLAG_CHANGES_COUNT);
-  }
-
-  bool dependsOnStaticPropertyStore() {
-    return getFlag(FLAG_DEPENDS_ON_STATIC_PROPERTY_STORE);
-  }
-  void setDependsOnStaticPropertyStore() {
-    setFlag(FLAG_DEPENDS_ON_STATIC_PROPERTY_STORE);
-  }
-  void setChangesStaticProperty() { setFlag(FLAG_CHANGES_STATIC_PROPERTY); }
-  bool changesStaticProperty() => getFlag(FLAG_CHANGES_STATIC_PROPERTY);
-
-  bool dependsOnIndexStore() => getFlag(FLAG_DEPENDS_ON_INDEX_STORE);
-  void setDependsOnIndexStore() { setFlag(FLAG_DEPENDS_ON_INDEX_STORE); }
-  void setChangesIndex() { setFlag(FLAG_CHANGES_INDEX); }
-  bool changesIndex() => getFlag(FLAG_CHANGES_INDEX);
-
-  bool dependsOnInstancePropertyStore() {
-    return getFlag(FLAG_DEPENDS_ON_INSTANCE_PROPERTY_STORE);
-  }
-  void setDependsOnInstancePropertyStore() {
-    setFlag(FLAG_DEPENDS_ON_INSTANCE_PROPERTY_STORE);
-  }
-  void setChangesInstanceProperty() { setFlag(FLAG_CHANGES_INSTANCE_PROPERTY); }
-  bool changesInstanceProperty() => getFlag(FLAG_CHANGES_INSTANCE_PROPERTY);
-
-  static int computeDependsOnFlags(int flags) => flags << FLAG_CHANGES_COUNT;
-
-  bool dependsOn(int dependsFlags) => (flags & dependsFlags) != 0;
-
-  void add(SideEffects other) {
-    flags |= other.flags;
-  }
-
-  String toString() {
-    StringBuffer buffer = new StringBuffer();
-    buffer.write('Depends on');
-    if (dependsOnIndexStore()) buffer.write(' []');
-    if (dependsOnInstancePropertyStore()) buffer.write(' field store');
-    if (dependsOnStaticPropertyStore()) buffer.write(' static store');
-    if (!dependsOnSomething()) buffer.write(' nothing');
-    buffer.write(', Changes');
-    if (changesIndex()) buffer.write(' []');
-    if (changesInstanceProperty()) buffer.write(' field');
-    if (changesStaticProperty()) buffer.write(' static');
-    if (!hasSideEffects()) buffer.write(' nothing');
-    buffer.write('.');
-    return buffer.toString();
-  }
-}