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

pkg/compiler/lib/src/constant_system_dart.dart

Index: pkg/compiler/lib/src/constant_system_dart.dart
diff --git a/pkg/compiler/lib/src/constant_system_dart.dart b/pkg/compiler/lib/src/constant_system_dart.dart
deleted file mode 100644
index 1cc239d8f52318904d42a4849f3cda03170801c8..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/constant_system_dart.dart
+++ /dev/null
@@ -1,408 +0,0 @@
-// Copyright (c) 2012, 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 dart2js;
-
-const DART_CONSTANT_SYSTEM = const DartConstantSystem();
-
-class BitNotOperation implements UnaryOperation {
-  final String name = '~';
-  const BitNotOperation();
-  ConstantValue fold(ConstantValue constant) {
-    if (constant.isInt) {
-      IntConstantValue intConstant = constant;
-      return DART_CONSTANT_SYSTEM.createInt(~intConstant.primitiveValue);
-    }
-    return null;
-  }
-}
-
-class NegateOperation implements UnaryOperation {
-  final String name = 'negate';
-  const NegateOperation();
-  ConstantValue fold(ConstantValue constant) {
-    if (constant.isInt) {
-      IntConstantValue intConstant = constant;
-      return DART_CONSTANT_SYSTEM.createInt(-intConstant.primitiveValue);
-    }
-    if (constant.isDouble) {
-      DoubleConstantValue doubleConstant = constant;
-      return DART_CONSTANT_SYSTEM.createDouble(-doubleConstant.primitiveValue);
-    }
-    return null;
-  }
-}
-
-class NotOperation implements UnaryOperation {
-  final String name = '!';
-  const NotOperation();
-  ConstantValue fold(ConstantValue constant) {
-    if (constant.isBool) {
-      BoolConstantValue boolConstant = constant;
-      return DART_CONSTANT_SYSTEM.createBool(!boolConstant.primitiveValue);
-    }
-    return null;
-  }
-}
-
-/**
- * Operations that only work if both arguments are integers.
- */
-abstract class BinaryBitOperation implements BinaryOperation {
-  const BinaryBitOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isInt && right.isInt) {
-      IntConstantValue leftInt = left;
-      IntConstantValue rightInt = right;
-      int resultValue =
-          foldInts(leftInt.primitiveValue, rightInt.primitiveValue);
-      if (resultValue == null) return null;
-      return DART_CONSTANT_SYSTEM.createInt(resultValue);
-    }
-    return null;
-  }
-
-  int foldInts(int left, int right);
-}
-
-class BitOrOperation extends BinaryBitOperation {
-  final String name = '|';
-  const BitOrOperation();
-  int foldInts(int left, int right)  => left | right;
-  apply(left, right) => left | right;
-}
-
-class BitAndOperation extends BinaryBitOperation {
-  final String name = '&';
-  const BitAndOperation();
-  int foldInts(int left, int right) => left & right;
-  apply(left, right) => left & right;
-}
-
-class BitXorOperation extends BinaryBitOperation {
-  final String name = '^';
-  const BitXorOperation();
-  int foldInts(int left, int right) => left ^ right;
-  apply(left, right) => left ^ right;
-}
-
-class ShiftLeftOperation extends BinaryBitOperation {
-  final String name = '<<';
-  const ShiftLeftOperation();
-  int foldInts(int left, int right) {
-    // TODO(floitsch): find a better way to guard against excessive shifts to
-    // the left.
-    if (right > 100 || right < 0) return null;
-    return left << right;
-  }
-  apply(left, right) => left << right;
-}
-
-class ShiftRightOperation extends BinaryBitOperation {
-  final String name = '>>';
-  const ShiftRightOperation();
-  int foldInts(int left, int right) {
-    if (right < 0) return null;
-    return left >> right;
-  }
-  apply(left, right) => left >> right;
-}
-
-abstract class BinaryBoolOperation implements BinaryOperation {
-  const BinaryBoolOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isBool && right.isBool) {
-      BoolConstantValue leftBool = left;
-      BoolConstantValue rightBool = right;
-      bool resultValue =
-          foldBools(leftBool.primitiveValue, rightBool.primitiveValue);
-      return DART_CONSTANT_SYSTEM.createBool(resultValue);
-    }
-    return null;
-  }
-
-  bool foldBools(bool left, bool right);
-}
-
-class BooleanAndOperation extends BinaryBoolOperation {
-  final String name = '&&';
-  const BooleanAndOperation();
-  bool foldBools(bool left, bool right) => left && right;
-  apply(left, right) => left && right;
-}
-
-class BooleanOrOperation extends BinaryBoolOperation {
-  final String name = '||';
-  const BooleanOrOperation();
-  bool foldBools(bool left, bool right) => left || right;
-  apply(left, right) => left || right;
-}
-
-abstract class ArithmeticNumOperation implements BinaryOperation {
-  const ArithmeticNumOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isNum && right.isNum) {
-      NumConstantValue leftNum = left;
-      NumConstantValue rightNum = right;
-      num foldedValue;
-      if (left.isInt && right.isInt) {
-        foldedValue = foldInts(leftNum.primitiveValue, rightNum.primitiveValue);
-      } else {
-        foldedValue = foldNums(leftNum.primitiveValue, rightNum.primitiveValue);
-      }
-      // A division by 0 means that we might not have a folded value.
-      if (foldedValue == null) return null;
-      if (left.isInt && right.isInt && !isDivide() ||
-          isTruncatingDivide()) {
-        assert(foldedValue is int);
-        return DART_CONSTANT_SYSTEM.createInt(foldedValue);
-      } else {
-        return DART_CONSTANT_SYSTEM.createDouble(foldedValue);
-      }
-    }
-    return null;
-  }
-
-  bool isDivide() => false;
-  bool isTruncatingDivide() => false;
-  num foldInts(int left, int right) => foldNums(left, right);
-  num foldNums(num left, num right);
-}
-
-class SubtractOperation extends ArithmeticNumOperation {
-  final String name = '-';
-  const SubtractOperation();
-  num foldNums(num left, num right) => left - right;
-  apply(left, right) => left - right;
-}
-
-class MultiplyOperation extends ArithmeticNumOperation {
-  final String name = '*';
-  const MultiplyOperation();
-  num foldNums(num left, num right) => left * right;
-  apply(left, right) => left * right;
-}
-
-class ModuloOperation extends ArithmeticNumOperation {
-  final String name = '%';
-  const ModuloOperation();
-  int foldInts(int left, int right) {
-    if (right == 0) return null;
-    return left % right;
-  }
-  num foldNums(num left, num right) => left % right;
-  apply(left, right) => left % right;
-}
-
-class TruncatingDivideOperation extends ArithmeticNumOperation {
-  final String name = '~/';
-  const TruncatingDivideOperation();
-  int foldInts(int left, int right) {
-    if (right == 0) return null;
-    return left ~/ right;
-  }
-  num foldNums(num left, num right) {
-    num ratio = left / right;
-    if (ratio.isNaN || ratio.isInfinite) return null;
-    return ratio.truncate().toInt();
-  }
-  apply(left, right) => left ~/ right;
-  bool isTruncatingDivide() => true;
-}
-
-class DivideOperation extends ArithmeticNumOperation {
-  final String name = '/';
-  const DivideOperation();
-  num foldNums(num left, num right) => left / right;
-  bool isDivide() => true;
-  apply(left, right) => left / right;
-}
-
-class AddOperation implements BinaryOperation {
-  final String name = '+';
-  const AddOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isInt && right.isInt) {
-      IntConstantValue leftInt = left;
-      IntConstantValue rightInt = right;
-      int result = leftInt.primitiveValue + rightInt.primitiveValue;
-      return DART_CONSTANT_SYSTEM.createInt(result);
-    } else if (left.isNum && right.isNum) {
-      NumConstantValue leftNum = left;
-      NumConstantValue rightNum = right;
-      double result = leftNum.primitiveValue + rightNum.primitiveValue;
-      return DART_CONSTANT_SYSTEM.createDouble(result);
-    } else {
-      return null;
-    }
-  }
-  apply(left, right) => left + right;
-}
-
-abstract class RelationalNumOperation implements BinaryOperation {
-  const RelationalNumOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (!left.isNum || !right.isNum) return null;
-    NumConstantValue leftNum = left;
-    NumConstantValue rightNum = right;
-    bool foldedValue =
-        foldNums(leftNum.primitiveValue, rightNum.primitiveValue);
-    assert(foldedValue != null);
-    return DART_CONSTANT_SYSTEM.createBool(foldedValue);
-  }
-
-  bool foldNums(num left, num right);
-}
-
-class LessOperation extends RelationalNumOperation {
-  final String name = '<';
-  const LessOperation();
-  bool foldNums(num left, num right) => left < right;
-  apply(left, right) => left < right;
-}
-
-class LessEqualOperation extends RelationalNumOperation {
-  final String name = '<=';
-  const LessEqualOperation();
-  bool foldNums(num left, num right) => left <= right;
-  apply(left, right) => left <= right;
-}
-
-class GreaterOperation extends RelationalNumOperation {
-  final String name = '>';
-  const GreaterOperation();
-  bool foldNums(num left, num right) => left > right;
-  apply(left, right) => left > right;
-}
-
-class GreaterEqualOperation extends RelationalNumOperation {
-  final String name = '>=';
-  const GreaterEqualOperation();
-  bool foldNums(num left, num right) => left >= right;
-  apply(left, right) => left >= right;
-}
-
-class EqualsOperation implements BinaryOperation {
-  final String name = '==';
-  const EqualsOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isNum && right.isNum) {
-      // Numbers need to be treated specially because: NaN != NaN, -0.0 == 0.0,
-      // and 1 == 1.0.
-      NumConstantValue leftNum = left;
-      NumConstantValue rightNum = right;
-      bool result = leftNum.primitiveValue == rightNum.primitiveValue;
-      return DART_CONSTANT_SYSTEM.createBool(result);
-    }
-    if (left.isConstructedObject) {
-      // Unless we know that the user-defined object does not implement the
-      // equality operator we cannot fold here.
-      return null;
-    }
-    return DART_CONSTANT_SYSTEM.createBool(left == right);
-  }
-  apply(left, right) => left == right;
-}
-
-class IdentityOperation implements BinaryOperation {
-  final String name = '===';
-  const IdentityOperation();
-  BoolConstantValue fold(ConstantValue left, ConstantValue right) {
-    // In order to preserve runtime semantics which says that NaN !== NaN don't
-    // constant fold NaN === NaN. Otherwise the output depends on inlined
-    // variables and other optimizations.
-    if (left.isNaN && right.isNaN) return null;
-    return DART_CONSTANT_SYSTEM.createBool(left == right);
-  }
-  apply(left, right) => identical(left, right);
-}
-
-abstract class CodeUnitAtOperation implements BinaryOperation {
-  final String name = 'charCodeAt';
-  const CodeUnitAtOperation();
-  apply(left, right) => left.codeUnitAt(right);
-}
-
-class CodeUnitAtConstantOperation extends CodeUnitAtOperation {
-  const CodeUnitAtConstantOperation();
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    // 'a'.codeUnitAt(0) is not a constant expression.
-    return null;
-  }
-}
-
-class CodeUnitAtRuntimeOperation extends CodeUnitAtOperation {
-  const CodeUnitAtRuntimeOperation();
-  IntConstantValue fold(ConstantValue left, ConstantValue right) {
-    if (left.isString && right.isInt) {
-      StringConstantValue stringConstant = left;
-      IntConstantValue indexConstant = right;
-      DartString dartString = stringConstant.primitiveValue;
-      int index = indexConstant.primitiveValue;
-      if (index < 0 || index >= dartString.length) return null;
-      String string = dartString.slowToString();
-      int value = string.codeUnitAt(index);
-      return DART_CONSTANT_SYSTEM.createInt(value);
-    }
-    return null;
-  }
-}
-
-/**
- * A constant system implementing the Dart semantics. This system relies on
- * the underlying runtime-system. That is, if dart2js is run in an environment
- * that doesn't correctly implement Dart's semantics this constant system will
- * not return the correct values.
- */
-class DartConstantSystem extends ConstantSystem {
-  final add = const AddOperation();
-  final bitAnd = const BitAndOperation();
-  final bitNot = const BitNotOperation();
-  final bitOr = const BitOrOperation();
-  final bitXor = const BitXorOperation();
-  final booleanAnd = const BooleanAndOperation();
-  final booleanOr = const BooleanOrOperation();
-  final divide = const DivideOperation();
-  final equal = const EqualsOperation();
-  final greaterEqual = const GreaterEqualOperation();
-  final greater = const GreaterOperation();
-  final identity = const IdentityOperation();
-  final lessEqual = const LessEqualOperation();
-  final less = const LessOperation();
-  final modulo = const ModuloOperation();
-  final multiply = const MultiplyOperation();
-  final negate = const NegateOperation();
-  final not = const NotOperation();
-  final shiftLeft = const ShiftLeftOperation();
-  final shiftRight = const ShiftRightOperation();
-  final subtract = const SubtractOperation();
-  final truncatingDivide = const TruncatingDivideOperation();
-  final codeUnitAt = const CodeUnitAtConstantOperation();
-
-  const DartConstantSystem();
-
-  IntConstantValue createInt(int i) => new IntConstantValue(i);
-  DoubleConstantValue createDouble(double d) => new DoubleConstantValue(d);
-  StringConstantValue createString(DartString string) {
-    return new StringConstantValue(string);
-  }
-  BoolConstantValue createBool(bool value) => new BoolConstantValue(value);
-  NullConstantValue createNull() => new NullConstantValue();
-  MapConstantValue createMap(Compiler compiler,
-                             InterfaceType type,
-                             List<ConstantValue> keys,
-                             List<ConstantValue> values) {
-    return new MapConstantValue(type, keys, values);
-  }
-
-  bool isInt(ConstantValue constant) => constant.isInt;
-  bool isDouble(ConstantValue constant) => constant.isDouble;
-  bool isString(ConstantValue constant) => constant.isString;
-  bool isBool(ConstantValue constant) => constant.isBool;
-  bool isNull(ConstantValue constant) => constant.isNull;
-
-  bool isSubtype(Compiler compiler, DartType s, DartType t) {
-    return compiler.types.isSubtype(s, t);
-  }
-}