Linter Demo

Errors: 4

Warnings: 26

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/constant_system_dart.dart

// 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 if (left.isString && right.isString) { StringConstantValue leftString = left; StringConstantValue rightString = right; DartString result = new DartString.concat(leftString.primitiveValue, rightString.primitiveValue); return DART_CONSTANT_SYSTEM.createString(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(DartTypes types, DartType s, DartType t) { return types.isSubtype(s, t); } }