FieldOperations.cs :  » Script » IronPython » Microsoft » Scripting » Interpreter » C# / CSharp Open Source

/* ****************************************************************************
 *
 * Copyright (c) Microsoft Corporation. 
 *
 * This source code is subject to terms and conditions of the Microsoft Public License. A 
 * copy of the license can be found in the License.html file at the root of this distribution. If 
 * you cannot locate the  Microsoft Public License, please send an email to 
 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
 * by the terms of the Microsoft Public License.
 *
 * You must not remove this notice, or any other, from this software.
 *
 *
 * ***************************************************************************/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;

namespace Microsoft.Scripting.Interpreter{
    internal sealed class LoadStaticFieldInstruction : Instruction {
        private readonly FieldInfo _field;

        public LoadStaticFieldInstruction(FieldInfo field) {
            Debug.Assert(field.IsStatic);
            _field = field;
        }

        public override int ProducedStack { get { return 1; } }

        public override int Run(InterpretedFrame frame) {
            frame.Push(_field.GetValue(null));
            return +1;
        }
    }

    internal sealed class LoadFieldInstruction : Instruction {
        private readonly FieldInfo _field;

        public LoadFieldInstruction(FieldInfo field) {
            Assert.NotNull(field);
            _field = field;
        }

        public override int ConsumedStack { get { return 1; } }
        public override int ProducedStack { get { return 1; } }

        public override int Run(InterpretedFrame frame) {
            frame.Push(_field.GetValue(frame.Pop()));
            return +1;
        }
    }

    internal sealed class StoreFieldInstruction : Instruction {
        private readonly FieldInfo _field;

        public StoreFieldInstruction(FieldInfo field) {
            Assert.NotNull(field);
            _field = field;
        }

        public override int ConsumedStack { get { return 2; } }
        public override int ProducedStack { get { return 0; } }

        public override int Run(InterpretedFrame frame) {
            object value = frame.Pop();
            object self = frame.Pop();
            _field.SetValue(self, value);
            return +1;
        }
    }

    internal sealed class StoreStaticFieldInstruction : Instruction {
        private readonly FieldInfo _field;

        public StoreStaticFieldInstruction(FieldInfo field) {
            Assert.NotNull(field);
            _field = field;
        }

        public override int ConsumedStack { get { return 1; } }
        public override int ProducedStack { get { return 0; } }

        public override int Run(InterpretedFrame frame) {
            object value = frame.Pop();
            _field.SetValue(null, value);
            return +1;
        }
    }
}