/Dependencies/boo/src/Boo.Lang.Compiler/Steps/UnfoldConstants.cs
C# | 214 lines | 155 code | 32 blank | 27 comment | 36 complexity | 14a3b68ad2dca08b30df76078be9481e MD5 | raw file
Possible License(s): GPL-2.0
- #region license
- // Copyright (c) 2003, 2004, 2005 Rodrigo B. de Oliveira (rbo@acm.org)
- // All rights reserved.
- //
- // Redistribution and use in source and binary forms, with or without modification,
- // are permitted provided that the following conditions are met:
- //
- // * Redistributions of source code must retain the above copyright notice,
- // this list of conditions and the following disclaimer.
- // * Redistributions in binary form must reproduce the above copyright notice,
- // this list of conditions and the following disclaimer in the documentation
- // and/or other materials provided with the distribution.
- // * Neither the name of Rodrigo B. de Oliveira nor the names of its
- // contributors may be used to endorse or promote products derived from this
- // software without specific prior written permission.
- //
- // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
- // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- // WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
- // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- #endregion
- using System;
- using Boo.Lang.Compiler.Ast;
- using Boo.Lang.Compiler.TypeSystem;
- namespace Boo.Lang.Compiler.Steps
- {
- /// <summary>
- /// </summary>
- public class UnfoldConstants : AbstractTransformerCompilerStep
- {
- public UnfoldConstants()
- {
- }
- public override void Run()
- {
- if (Errors.Count > 0) return;
- Visit(CompileUnit);
- }
- public override void LeaveBinaryExpression(BinaryExpression node)
- {
- switch (node.Operator)
- {
- case BinaryOperatorType.BitwiseOr:
- LeaveBitwiseOr(node);
- break;
- case BinaryOperatorType.BitwiseAnd:
- LeaveBitwiseAnd(node);
- break;
- case BinaryOperatorType.Addition:
- LeaveAddition(node);
- break;
- case BinaryOperatorType.Subtraction:
- LeaveSubtraction(node);
- break;
- case BinaryOperatorType.ExclusiveOr:
- LeaveExclusiveOr(node);
- break;
- }
- }
- private object GetLiteral(Expression expression)
- {
- switch (expression.NodeType)
- {
- case NodeType.CastExpression:
- return GetLiteral(((CastExpression)expression).Target);
- case NodeType.IntegerLiteralExpression:
- return ((IntegerLiteralExpression)expression).Value;
- }
- IField field = TypeSystemServices.GetOptionalEntity(expression) as IField;
- if (field == null) return null;
- if (!field.IsLiteral) return null;
- return field.StaticValue;
- }
- private void LeaveBitwiseOr(BinaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
- object lhs = GetLiteral(node.Left);
- if (null == lhs) return;
- object rhs = GetLiteral(node.Right);
- if (null == rhs) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(GetLongValue(rhs)|GetLongValue(lhs))));
- }
- private void LeaveBitwiseAnd(BinaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
- object lhs = GetLiteral(node.Left);
- if (null == lhs) return;
- object rhs = GetLiteral(node.Right);
- if (null == rhs) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(GetLongValue(rhs)&GetLongValue(lhs))));
- }
- private void LeaveAddition(BinaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
- object lhs = GetLiteral(node.Left);
- if (null == lhs) return;
- object rhs = GetLiteral(node.Right);
- if (null == rhs) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(GetLongValue(lhs)+GetLongValue(rhs))));
- }
- private void LeaveSubtraction(BinaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
- object lhs = GetLiteral(node.Left);
- if (null == lhs) return;
- object rhs = GetLiteral(node.Right);
- if (null == rhs) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(GetLongValue(lhs)-GetLongValue(rhs))));
- }
- private void LeaveExclusiveOr(BinaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
- object lhs = GetLiteral(node.Left);
- if (null == lhs) return;
- object rhs = GetLiteral(node.Right);
- if (null == rhs) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(GetLongValue(rhs)^GetLongValue(lhs))));
- }
-
- private long GetLongValue(object o)
- {
- return (long) Convert.ChangeType(o, typeof(long));
- }
- public override void LeaveUnaryExpression(Boo.Lang.Compiler.Ast.UnaryExpression node)
- {
- switch (node.Operator)
- {
- case UnaryOperatorType.UnaryNegation:
- {
- LeaveUnaryNegation(node);
- break;
- }
- case UnaryOperatorType.OnesComplement:
- {
- LeaveOnesCompliment(node);
- break;
- }
- }
- }
- private void LeaveUnaryNegation(UnaryExpression node)
- {
- Expression operand = node.Operand;
- switch (operand.NodeType)
- {
- case NodeType.IntegerLiteralExpression:
- (operand as IntegerLiteralExpression).Value *= -1;
- ReplaceCurrentNode(operand);
- break;
- }
- }
-
- private void LeaveOnesCompliment(UnaryExpression node)
- {
- IType type = TypeSystemServices.GetExpressionType(node);
- if (!type.IsEnum) return;
-
- object operand = GetLiteral(node.Operand);
- if (null == operand) return;
- ReplaceCurrentNode(
- CodeBuilder.CreateCast(type,
- CodeBuilder.CreateIntegerLiteral(~GetLongValue(operand))));
- }
- }
- }