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

pkg/compiler/lib/src/js_backend/constant_system_javascript.dart

Index: pkg/compiler/lib/src/js_backend/constant_system_javascript.dart
diff --git a/pkg/compiler/lib/src/js_backend/constant_system_javascript.dart b/pkg/compiler/lib/src/js_backend/constant_system_javascript.dart
deleted file mode 100644
index 3d6e72fb1d831c0c9e3c53e97d2884fb7be92fc0..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/js_backend/constant_system_javascript.dart
+++ /dev/null
@@ -1,345 +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 js_backend;
-
-const JAVA_SCRIPT_CONSTANT_SYSTEM = const JavaScriptConstantSystem();
-
-class JavaScriptBitNotOperation extends BitNotOperation {
-  const JavaScriptBitNotOperation();
-
-  ConstantValue fold(ConstantValue constant) {
-    if (JAVA_SCRIPT_CONSTANT_SYSTEM.isInt(constant)) {
-      // In JavaScript we don't check for -0 and treat it as if it was zero.
-      if (constant.isMinusZero) constant = DART_CONSTANT_SYSTEM.createInt(0);
-      IntConstantValue intConstant = constant;
-      // We convert the result of bit-operations to 32 bit unsigned integers.
-      return
-          JAVA_SCRIPT_CONSTANT_SYSTEM.createInt32(~intConstant.primitiveValue);
-    }
-    return null;
-  }
-}
-
-/**
- * In JavaScript we truncate the result to an unsigned 32 bit integer. Also, -0
- * is treated as if it was the integer 0.
- */
-class JavaScriptBinaryBitOperation implements BinaryOperation {
-  final BinaryBitOperation dartBitOperation;
-
-  const JavaScriptBinaryBitOperation(this.dartBitOperation);
-
-  String get name => dartBitOperation.name;
-
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    // In JavaScript we don't check for -0 and treat it as if it was zero.
-    if (left.isMinusZero) left = DART_CONSTANT_SYSTEM.createInt(0);
-    if (right.isMinusZero) right = DART_CONSTANT_SYSTEM.createInt(0);
-    IntConstantValue result = dartBitOperation.fold(left, right);
-    if (result != null) {
-      // We convert the result of bit-operations to 32 bit unsigned integers.
-      return JAVA_SCRIPT_CONSTANT_SYSTEM.createInt32(result.primitiveValue);
-    }
-    return result;
-  }
-
-  apply(left, right) => dartBitOperation.apply(left, right);
-}
-
-class JavaScriptShiftRightOperation extends JavaScriptBinaryBitOperation {
-  const JavaScriptShiftRightOperation() : super(const ShiftRightOperation());
-
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    // Truncate the input value to 32 bits if necessary.
-    if (left.isInt) {
-      IntConstantValue intConstant = left;
-      int value = intConstant.primitiveValue;
-      int truncatedValue = value & JAVA_SCRIPT_CONSTANT_SYSTEM.BITS32;
-      if (value < 0) {
-        // Sign-extend if the input was negative. The current semantics don't
-        // make much sense, since we only look at bit 31.
-        // TODO(floitsch): we should treat the input to right shifts as
-        // unsigned.
-
-        // A 32 bit complement-two value x can be computed by:
-        //    x_u - 2^32 (where x_u is its unsigned representation).
-        // Example: 0xFFFFFFFF - 0x100000000 => -1.
-        // We simply and with the sign-bit and multiply by two. If the sign-bit
-        // was set, then the result is 0. Otherwise it will become 2^32.
-        final int SIGN_BIT = 0x80000000;
-        truncatedValue -= 2 * (truncatedValue & SIGN_BIT);
-      }
-      if (value != truncatedValue) {
-        left = DART_CONSTANT_SYSTEM.createInt(truncatedValue);
-      }
-    }
-    return super.fold(left, right);
-  }
-}
-
-class JavaScriptNegateOperation implements UnaryOperation {
-  final NegateOperation dartNegateOperation = const NegateOperation();
-
-  const JavaScriptNegateOperation();
-
-  String get name => dartNegateOperation.name;
-
-  ConstantValue fold(ConstantValue constant) {
-    if (constant.isInt) {
-      IntConstantValue intConstant = constant;
-      if (intConstant.primitiveValue == 0) {
-        return JAVA_SCRIPT_CONSTANT_SYSTEM.createDouble(-0.0);
-      }
-    }
-    return dartNegateOperation.fold(constant);
-  }
-}
-
-class JavaScriptBinaryArithmeticOperation implements BinaryOperation {
-  final BinaryOperation dartArithmeticOperation;
-
-  const JavaScriptBinaryArithmeticOperation(this.dartArithmeticOperation);
-
-  String get name => dartArithmeticOperation.name;
-
-  ConstantValue fold(ConstantValue left, ConstantValue right) {
-    ConstantValue result = dartArithmeticOperation.fold(left, right);
-    if (result == null) return result;
-    return JAVA_SCRIPT_CONSTANT_SYSTEM.convertToJavaScriptConstant(result);
-  }
-
-  apply(left, right) => dartArithmeticOperation.apply(left, right);
-}
-
-class JavaScriptIdentityOperation implements BinaryOperation {
-  final IdentityOperation dartIdentityOperation = const IdentityOperation();
-
-  const JavaScriptIdentityOperation();
-
-  String get name => dartIdentityOperation.name;
-
-  BoolConstantValue fold(ConstantValue left, ConstantValue right) {
-    BoolConstantValue result = dartIdentityOperation.fold(left, right);
-    if (result == null || result.primitiveValue) return result;
-    // In JavaScript -0.0 === 0 and all doubles are equal to their integer
-    // values. Furthermore NaN !== NaN.
-    if (left.isNum && right.isNum) {
-      NumConstantValue leftNum = left;
-      NumConstantValue rightNum = right;
-      double leftDouble = leftNum.primitiveValue.toDouble();
-      double rightDouble = rightNum.primitiveValue.toDouble();
-      return new BoolConstantValue(leftDouble == rightDouble);
-    }
-    return result;
-  }
-
-  apply(left, right) => identical(left, right);
-}
-
-/**
- * Constant system following the semantics for Dart code that has been
- * compiled to JavaScript.
- */
-class JavaScriptConstantSystem extends ConstantSystem {
-  final int BITS31 = 0x8FFFFFFF;
-  final int BITS32 = 0xFFFFFFFF;
-
-  final add = const JavaScriptBinaryArithmeticOperation(const AddOperation());
-  final bitAnd = const JavaScriptBinaryBitOperation(const BitAndOperation());
-  final bitNot = const JavaScriptBitNotOperation();
-  final bitOr = const JavaScriptBinaryBitOperation(const BitOrOperation());
-  final bitXor = const JavaScriptBinaryBitOperation(const BitXorOperation());
-  final booleanAnd = const BooleanAndOperation();
-  final booleanOr = const BooleanOrOperation();
-  final divide =
-      const JavaScriptBinaryArithmeticOperation(const DivideOperation());
-  final equal = const EqualsOperation();
-  final greaterEqual = const GreaterEqualOperation();
-  final greater = const GreaterOperation();
-  final identity = const JavaScriptIdentityOperation();
-  final lessEqual = const LessEqualOperation();
-  final less = const LessOperation();
-  final modulo =
-      const JavaScriptBinaryArithmeticOperation(const ModuloOperation());
-  final multiply =
-      const JavaScriptBinaryArithmeticOperation(const MultiplyOperation());
-  final negate = const JavaScriptNegateOperation();
-  final not = const NotOperation();
-  final shiftLeft =
-      const JavaScriptBinaryBitOperation(const ShiftLeftOperation());
-  final shiftRight = const JavaScriptShiftRightOperation();
-  final subtract =
-      const JavaScriptBinaryArithmeticOperation(const SubtractOperation());
-  final truncatingDivide = const JavaScriptBinaryArithmeticOperation(
-      const TruncatingDivideOperation());
-  final codeUnitAt = const CodeUnitAtRuntimeOperation();
-
-  const JavaScriptConstantSystem();
-
-  /**
-   * Returns true if [value] will turn into NaN or infinity
-   * at runtime.
-   */
-  bool integerBecomesNanOrInfinity(int value) {
-    double doubleValue = value.toDouble();
-    return doubleValue.isNaN || doubleValue.isInfinite;
-  }
-
-  NumConstantValue convertToJavaScriptConstant(NumConstantValue constant) {
-    if (constant.isInt) {
-      IntConstantValue intConstant = constant;
-      int intValue = intConstant.primitiveValue;
-      if (integerBecomesNanOrInfinity(intValue)) {
-        return new DoubleConstantValue(intValue.toDouble());
-      }
-      // If the integer loses precision with JavaScript numbers, use
-      // the floored version JavaScript will use.
-      int floorValue = intValue.toDouble().floor().toInt();
-      if (floorValue != intValue) {
-        return new IntConstantValue(floorValue);
-      }
-    } else if (constant.isDouble) {
-      DoubleConstantValue doubleResult = constant;
-      double doubleValue = doubleResult.primitiveValue;
-      if (!doubleValue.isInfinite && !doubleValue.isNaN &&
-          !constant.isMinusZero) {
-        int intValue = doubleValue.truncate();
-        if (intValue == doubleValue) {
-          return new IntConstantValue(intValue);
-        }
-      }
-    }
-    return constant;
-  }
-
-  NumConstantValue createInt(int i)
-      => convertToJavaScriptConstant(new IntConstantValue(i));
-  NumConstantValue createInt32(int i) => new IntConstantValue(i & BITS32);
-  NumConstantValue createDouble(double d)
-      => convertToJavaScriptConstant(new DoubleConstantValue(d));
-  StringConstantValue createString(DartString string) {
-    return new StringConstantValue(string);
-  }
-  BoolConstantValue createBool(bool value) => new BoolConstantValue(value);
-  NullConstantValue createNull() => new NullConstantValue();
-
-  // Integer checks don't verify that the number is not -0.0.
-  bool isInt(ConstantValue constant) => constant.isInt || constant.isMinusZero;
-  bool isDouble(ConstantValue constant)
-      => constant.isDouble && !constant.isMinusZero;
-  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) {
-    // At runtime, an integer is both an integer and a double: the
-    // integer type check is Math.floor, which will return true only
-    // for real integers, and our double type check is 'typeof number'
-    // which will return true for both integers and doubles.
-    if (s.element == compiler.intClass && t.element == compiler.doubleClass) {
-      return true;
-    }
-    return compiler.types.isSubtype(s, t);
-  }
-
-  MapConstantValue createMap(Compiler compiler,
-                        InterfaceType sourceType,
-                        List<ConstantValue> keys,
-                        List<ConstantValue> values) {
-    JavaScriptBackend backend = compiler.backend;
-
-    bool onlyStringKeys = true;
-    ConstantValue protoValue = null;
-    for (int i = 0; i < keys.length ; i++) {
-      var key = keys[i];
-      if (key.isString) {
-        if (key.primitiveValue == JavaScriptMapConstant.PROTO_PROPERTY) {
-          protoValue = values[i];
-        }
-      } else {
-        onlyStringKeys = false;
-        // Don't handle __proto__ values specially in the general map case.
-        protoValue = null;
-        break;
-      }
-    }
-
-    bool hasProtoKey = (protoValue != null);
-    DartType keysType;
-    if (sourceType.treatAsRaw) {
-      keysType = compiler.listClass.rawType;
-    } else {
-      List<DartType> arguments = <DartType>[sourceType.typeArguments.first];
-      keysType = new InterfaceType(compiler.listClass, arguments);
-    }
-    ListConstantValue keysList = new ListConstantValue(keysType, keys);
-    String className = onlyStringKeys
-        ? (hasProtoKey ? JavaScriptMapConstant.DART_PROTO_CLASS
-                       : JavaScriptMapConstant.DART_STRING_CLASS)
-        : JavaScriptMapConstant.DART_GENERAL_CLASS;
-    ClassElement classElement = backend.jsHelperLibrary.find(className);
-    classElement.ensureResolved(compiler);
-    List<DartType> typeArgument = sourceType.typeArguments;
-    InterfaceType type;
-    if (sourceType.treatAsRaw) {
-      type = classElement.rawType;
-    } else {
-      type = new InterfaceType(classElement, typeArgument);
-    }
-    return new JavaScriptMapConstant(
-        type, keysList, values, protoValue, onlyStringKeys);
-
-  }
-}
-
-class JavaScriptMapConstant extends MapConstantValue {
-  /**
-   * The [PROTO_PROPERTY] must not be used as normal property in any JavaScript
-   * object. It would change the prototype chain.
-   */
-  static const LiteralDartString PROTO_PROPERTY =
-      const LiteralDartString("__proto__");
-
-  /** The dart class implementing constant map literals. */
-  static const String DART_CLASS = "ConstantMap";
-  static const String DART_STRING_CLASS = "ConstantStringMap";
-  static const String DART_PROTO_CLASS = "ConstantProtoMap";
-  static const String DART_GENERAL_CLASS = "GeneralConstantMap";
-  static const String LENGTH_NAME = "length";
-  static const String JS_OBJECT_NAME = "_jsObject";
-  static const String KEYS_NAME = "_keys";
-  static const String PROTO_VALUE = "_protoValue";
-  static const String JS_DATA_NAME = "_jsData";
-
-  final ListConstantValue keyList;
-  final ConstantValue protoValue;
-  final bool onlyStringKeys;
-
-  JavaScriptMapConstant(InterfaceType type,
-                        ListConstantValue keyList,
-                        List<ConstantValue> values,
-                        this.protoValue,
-                        this.onlyStringKeys)
-      : this.keyList = keyList,
-        super(type, keyList.entries, values);
-  bool get isMap => true;
-
-  TypeMask computeMask(Compiler compiler) {
-    return compiler.typesTask.constMapType;
-  }
-
-  List<ConstantValue> getDependencies() {
-    List<ConstantValue> result = <ConstantValue>[];
-    if (onlyStringKeys) {
-      result.add(keyList);
-    } else {
-      // Add the keys individually to avoid generating an unused list constant
-      // for the keys.
-      result.addAll(keys);
-    }
-    result.addAll(values);
-    return result;
-  }
-}