82 lines
2.5 KiB
C#
82 lines
2.5 KiB
C#
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/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using dnSpy.Debugger.DotNet.Metadata;
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namespace dnSpy.Roslyn.Debugger.Formatters {
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sealed class EnumInfo {
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public bool HasFlagsAttribute { get; }
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public EnumFieldInfo[] FieldInfos { get; }
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EnumInfo(bool hasFlagsAttribute, EnumFieldInfo[] fieldInfos) {
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HasFlagsAttribute = hasFlagsAttribute;
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FieldInfos = fieldInfos;
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}
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public static EnumInfo GetEnumInfo(DmdType type) {
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if (type is null)
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throw new ArgumentNullException(nameof(type));
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if (!type.IsEnum)
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throw new ArgumentException();
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if (type.TryGetData(out EnumInfo? info))
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return info;
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return GetAndCreateEnumInfo(type);
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}
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static EnumInfo GetAndCreateEnumInfo(DmdType type) {
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var result = CreateEnumInfo(type);
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return type.GetOrCreateData(() => result);
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}
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static EnumInfo CreateEnumInfo(DmdType type) {
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bool hasFlagsAttribute = type.IsDefined("System.FlagsAttribute", inherit: false);
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var fields = type.DeclaredFields;
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int count = fields.Count - 1;
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if (count <= 0)
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return new EnumInfo(hasFlagsAttribute, Array.Empty<EnumFieldInfo>());
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var infos = new EnumFieldInfo[count];
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int w = 0;
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for (int i = 0; i < fields.Count; i++) {
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var field = fields[i];
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if (!field.IsLiteral || !field.IsStatic)
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continue;
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if (!NumberUtils.TryConvertIntegerToUInt64ZeroExtend(field.GetRawConstantValue(), out var value))
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continue;
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if (w >= infos.Length)
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Array.Resize(ref infos, w + 1);
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infos[w++] = new EnumFieldInfo(field, value);
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}
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if (infos.Length != w)
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Array.Resize(ref infos, w);
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return new EnumInfo(hasFlagsAttribute, infos);
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}
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}
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readonly struct EnumFieldInfo {
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public DmdFieldInfo Field { get; }
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public ulong Value { get; }
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public EnumFieldInfo(DmdFieldInfo field, ulong value) {
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Field = field ?? throw new ArgumentNullException(nameof(field));
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Value = value;
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}
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}
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}
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