mirror of
https://github.com/icsharpcode/ILSpy.git
synced 2026-10-12 02:15:58 +00:00
Daniel Grunwald
5670bfc132
This was due to StackType.O doing double-duty as `object` and `other`. While ExpressionBuilder would often improve the type of such locals, the `object` nevertheless ended up used in a couple of places, e.g. via the `typeHint`. This could result in value types being boxed even though the original IL didn't contain any `box` instruction. This is an attempt to use better types for stack slot variables created by ILReader. The idea is: there aren't many IL instructions that produce "other" value types, and `InferType()` already handles pretty much all of them, so we can use that to assign types to our stack slots. It's a bit more tricky if the stack is pushed to on multiple branches that join together before the value is used: here the variable type must be suitable for both assignments. In this case, we go back to the previously-used stacktype.
545 lines
16 KiB
C#
545 lines
16 KiB
C#
// Copyright (c) 2015 Siegfried Pammer
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System.Reflection;
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using ICSharpCode.Decompiler.IL;
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using ICSharpCode.Decompiler.TypeSystem.Implementation;
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namespace ICSharpCode.Decompiler.TypeSystem
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{
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public static class TypeUtils
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{
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public const int NativeIntSize = 6; // between 4 (Int32) and 8 (Int64)
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/// <summary>
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/// Gets the size (in bytes) of the input type.
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/// Returns <c>NativeIntSize</c> for pointer-sized types.
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/// Returns 0 for structs and other types of unknown size.
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/// </summary>
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public static int GetSize(this IType type)
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{
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switch (type.Kind)
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{
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case TypeKind.Pointer:
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case TypeKind.ByReference:
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case TypeKind.Class:
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case TypeKind.NInt:
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case TypeKind.NUInt:
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return NativeIntSize;
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case TypeKind.Enum:
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type = type.GetEnumUnderlyingType();
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break;
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case TypeKind.ModOpt:
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case TypeKind.ModReq:
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return type.SkipModifiers().GetSize();
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}
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var typeDef = type.GetDefinition();
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if (typeDef == null)
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return 0;
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switch (typeDef.KnownTypeCode)
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{
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case KnownTypeCode.Boolean:
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case KnownTypeCode.SByte:
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case KnownTypeCode.Byte:
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return 1;
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case KnownTypeCode.Char:
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case KnownTypeCode.Int16:
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case KnownTypeCode.UInt16:
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return 2;
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case KnownTypeCode.Int32:
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case KnownTypeCode.UInt32:
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case KnownTypeCode.Single:
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return 4;
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case KnownTypeCode.IntPtr:
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case KnownTypeCode.UIntPtr:
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return NativeIntSize;
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case KnownTypeCode.Int64:
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case KnownTypeCode.UInt64:
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case KnownTypeCode.Double:
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return 8;
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}
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return 0;
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}
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/// <summary>
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/// Gets the size of the input stack type.
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/// </summary>
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/// <returns>
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/// * 4 for <c>I4</c>,
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/// * 8 for <c>I8</c>,
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/// * <c>NativeIntSize</c> for <c>I</c> and <c>Ref</c>,
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/// * 0 otherwise (O, F, Void, Unknown).
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/// </returns>
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public static int GetSize(this StackType type)
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{
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switch (type)
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{
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case StackType.I4:
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return 4;
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case StackType.I8:
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return 8;
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case StackType.I:
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case StackType.Ref:
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return NativeIntSize;
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default:
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return 0;
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}
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}
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public static IType GetLargerType(IType type1, IType type2)
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{
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return GetSize(type1) >= GetSize(type2) ? type1 : type2;
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}
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/// <summary>
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/// Gets whether the type is a small integer type.
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/// Small integer types are:
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/// * bool, sbyte, byte, char, short, ushort
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/// * any enums that have a small integer type as underlying type
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/// </summary>
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public static bool IsSmallIntegerType(this IType type)
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{
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int size = GetSize(type);
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return size > 0 && size < 4;
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}
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/// <summary>
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/// Gets whether the type is a C# small integer type: byte, sbyte, short or ushort.
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///
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/// Unlike the ILAst, C# does not consider bool, char or enums to be small integers.
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/// </summary>
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public static bool IsCSharpSmallIntegerType(this IType type)
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{
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switch (type.GetDefinition()?.KnownTypeCode)
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{
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case KnownTypeCode.Byte:
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case KnownTypeCode.SByte:
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case KnownTypeCode.Int16:
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case KnownTypeCode.UInt16:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// Gets whether the type is a C# 9 native integer type: nint or nuint.
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///
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/// Returns false for (U)IntPtr.
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/// </summary>
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public static bool IsCSharpNativeIntegerType(this IType type)
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{
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switch (type.Kind)
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{
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case TypeKind.NInt:
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case TypeKind.NUInt:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// Gets whether the type is a C# primitive integer type: byte, sbyte, short, ushort, int, uint, long and ulong.
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///
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/// Unlike the ILAst, C# does not consider bool, enums, pointers or IntPtr to be integers.
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/// </summary>
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public static bool IsCSharpPrimitiveIntegerType(this IType type)
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{
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switch (type.GetDefinition()?.KnownTypeCode)
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{
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case KnownTypeCode.Byte:
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case KnownTypeCode.SByte:
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case KnownTypeCode.Int16:
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case KnownTypeCode.UInt16:
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case KnownTypeCode.Int32:
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case KnownTypeCode.UInt32:
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case KnownTypeCode.Int64:
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case KnownTypeCode.UInt64:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// Gets whether the type is an IL integer type.
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/// Returns true for I4, I, or I8.
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/// </summary>
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public static bool IsIntegerType(this StackType type)
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{
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switch (type)
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{
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case StackType.I4:
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case StackType.I:
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case StackType.I8:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// Gets whether the type is an IL floating point type.
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/// Returns true for F4 or F8.
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/// </summary>
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public static bool IsFloatType(this StackType type)
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{
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switch (type)
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{
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case StackType.F4:
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case StackType.F8:
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return true;
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default:
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return false;
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}
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}
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/// <summary>
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/// Gets whether reading/writing an element of accessType from the pointer
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/// is equivalent to reading/writing an element of the pointer's element type.
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/// </summary>
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/// <remarks>
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/// The access semantics may sligthly differ on read accesses of small integer types,
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/// due to zero extension vs. sign extension when the signs differ.
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/// </remarks>
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public static bool IsCompatiblePointerTypeForMemoryAccess(IType pointerType, IType accessType)
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{
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IType memoryType;
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if (pointerType is PointerType || pointerType is ByReferenceType)
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memoryType = ((TypeWithElementType)pointerType).ElementType;
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else
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return false;
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return IsCompatibleTypeForMemoryAccess(memoryType, accessType);
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}
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/// <summary>
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/// Gets whether reading/writing an element of accessType from the pointer
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/// is equivalent to reading/writing an element of the memoryType.
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/// </summary>
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/// <remarks>
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/// The access semantics may sligthly differ on read accesses of small integer types,
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/// due to zero extension vs. sign extension when the signs differ.
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/// </remarks>
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public static bool IsCompatibleTypeForMemoryAccess(IType memoryType, IType accessType)
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{
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memoryType = memoryType.AcceptVisitor(NormalizeTypeVisitor.TypeErasure);
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accessType = accessType.AcceptVisitor(NormalizeTypeVisitor.TypeErasure);
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if (memoryType.Equals(accessType))
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return true;
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// If the types are not equal, the access still might produce equal results in some cases:
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// 1) Both types are reference types
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if (memoryType.IsReferenceType == true && accessType.IsReferenceType == true)
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return true;
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// 2) Both types are integer types of equal size
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StackType memoryStackType = memoryType.GetStackType();
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StackType accessStackType = accessType.GetStackType();
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if (memoryStackType == accessStackType && memoryStackType.IsIntegerType() && GetSize(memoryType) == GetSize(accessType))
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return true;
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// 3) Any of the types is unknown: we assume they are compatible.
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return memoryType.Kind == TypeKind.Unknown || accessType.Kind == TypeKind.Unknown;
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}
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/// <summary>
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/// Gets the stack type corresponding to this type.
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/// </summary>
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public static StackType GetStackType(this IType type)
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{
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switch (type.Kind)
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{
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case TypeKind.Unknown:
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if (type.IsReferenceType == true)
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{
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return StackType.O;
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}
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return StackType.Unknown;
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case TypeKind.ByReference:
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return StackType.Ref;
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case TypeKind.Pointer:
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case TypeKind.NInt:
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case TypeKind.NUInt:
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case TypeKind.FunctionPointer:
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return StackType.I;
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case TypeKind.TypeParameter:
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// Type parameters are always considered StackType.O, even
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// though they might be instantiated with primitive types.
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return StackType.O;
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case TypeKind.ModOpt:
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case TypeKind.ModReq:
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return type.SkipModifiers().GetStackType();
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}
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ITypeDefinition typeDef = type.GetEnumUnderlyingType().GetDefinition();
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if (typeDef == null)
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return StackType.O;
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switch (typeDef.KnownTypeCode)
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{
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case KnownTypeCode.Boolean:
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case KnownTypeCode.Char:
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case KnownTypeCode.SByte:
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case KnownTypeCode.Byte:
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case KnownTypeCode.Int16:
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case KnownTypeCode.UInt16:
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case KnownTypeCode.Int32:
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case KnownTypeCode.UInt32:
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return StackType.I4;
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case KnownTypeCode.Int64:
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case KnownTypeCode.UInt64:
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return StackType.I8;
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case KnownTypeCode.Single:
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return StackType.F4;
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case KnownTypeCode.Double:
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return StackType.F8;
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case KnownTypeCode.Void:
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return StackType.Void;
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case KnownTypeCode.IntPtr:
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case KnownTypeCode.UIntPtr:
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return StackType.I;
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default:
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return StackType.O;
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}
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}
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/// <summary>
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/// Returns true for types where compilation.FindType(type.GetStackType()) will
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/// be completely unsuitable (e.g. lead to miscompilation if the stack type
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/// alone is used for when a variable is created for a stack slot):
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/// * managed reference types
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/// * value types with StackType.O
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/// </summary>
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public static bool CannotBeReconstructedFromStackType(this IType type)
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{
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var stackType = type.GetStackType();
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if (stackType == StackType.Ref)
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{
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return true;
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}
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return stackType == StackType.O && type.IsReferenceType == false;
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}
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/// <summary>
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/// If type is an enumeration type, returns the underlying type.
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/// Otherwise, returns type unmodified.
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/// </summary>
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public static IType GetEnumUnderlyingType(this IType type)
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{
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type = type.SkipModifiers();
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return (type.Kind == TypeKind.Enum) ? type.GetDefinition().EnumUnderlyingType : type;
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}
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/// <summary>
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/// Gets the sign of the input type.
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/// </summary>
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/// <remarks>
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/// Integer types (including IntPtr/UIntPtr) return the sign as expected.
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/// Floating point types and <c>decimal</c> are considered to be signed.
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/// <c>char</c>, <c>bool</c> and pointer types (e.g. <c>void*</c>) are unsigned.
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/// Enums have a sign based on their underlying type.
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/// All other types return <c>Sign.None</c>.
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/// </remarks>
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public static Sign GetSign(this IType type)
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{
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type = type.SkipModifiers();
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switch (type.Kind)
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{
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case TypeKind.Pointer:
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case TypeKind.NUInt:
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case TypeKind.FunctionPointer:
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return Sign.Unsigned;
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case TypeKind.NInt:
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return Sign.Signed;
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}
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var typeDef = type.GetEnumUnderlyingType().GetDefinition();
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if (typeDef == null)
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return Sign.None;
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switch (typeDef.KnownTypeCode)
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{
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case KnownTypeCode.SByte:
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case KnownTypeCode.Int16:
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case KnownTypeCode.Int32:
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case KnownTypeCode.Int64:
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case KnownTypeCode.IntPtr:
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case KnownTypeCode.Single:
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case KnownTypeCode.Double:
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case KnownTypeCode.Decimal:
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return Sign.Signed;
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case KnownTypeCode.UIntPtr:
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case KnownTypeCode.Char:
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case KnownTypeCode.Boolean:
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case KnownTypeCode.Byte:
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case KnownTypeCode.UInt16:
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case KnownTypeCode.UInt32:
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case KnownTypeCode.UInt64:
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return Sign.Unsigned;
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default:
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return Sign.None;
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}
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}
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/// <summary>
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/// Maps the KnownTypeCode values to the corresponding PrimitiveTypes.
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/// </summary>
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public static PrimitiveType ToPrimitiveType(this KnownTypeCode knownTypeCode)
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{
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switch (knownTypeCode)
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{
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case KnownTypeCode.SByte:
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return PrimitiveType.I1;
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case KnownTypeCode.Int16:
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return PrimitiveType.I2;
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case KnownTypeCode.Int32:
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return PrimitiveType.I4;
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case KnownTypeCode.Int64:
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return PrimitiveType.I8;
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case KnownTypeCode.Single:
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return PrimitiveType.R4;
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case KnownTypeCode.Double:
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return PrimitiveType.R8;
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case KnownTypeCode.Byte:
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return PrimitiveType.U1;
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case KnownTypeCode.UInt16:
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case KnownTypeCode.Char:
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return PrimitiveType.U2;
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case KnownTypeCode.UInt32:
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return PrimitiveType.U4;
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case KnownTypeCode.UInt64:
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return PrimitiveType.U8;
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case KnownTypeCode.IntPtr:
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return PrimitiveType.I;
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case KnownTypeCode.UIntPtr:
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return PrimitiveType.U;
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default:
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return PrimitiveType.None;
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}
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}
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/// <summary>
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/// Maps the KnownTypeCode values to the corresponding PrimitiveTypes.
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/// </summary>
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public static PrimitiveType ToPrimitiveType(this IType type)
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{
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type = type.SkipModifiers();
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switch (type.Kind)
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{
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case TypeKind.Unknown:
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return PrimitiveType.Unknown;
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case TypeKind.ByReference:
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return PrimitiveType.Ref;
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case TypeKind.NInt:
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case TypeKind.FunctionPointer:
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return PrimitiveType.I;
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case TypeKind.NUInt:
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return PrimitiveType.U;
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}
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var def = type.GetEnumUnderlyingType().GetDefinition();
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return def != null ? def.KnownTypeCode.ToPrimitiveType() : PrimitiveType.None;
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}
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/// <summary>
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/// Maps the PrimitiveType values to the corresponding KnownTypeCodes.
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/// </summary>
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public static KnownTypeCode ToKnownTypeCode(this PrimitiveType primitiveType)
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{
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switch (primitiveType)
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{
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case PrimitiveType.I1:
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return KnownTypeCode.SByte;
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case PrimitiveType.I2:
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return KnownTypeCode.Int16;
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case PrimitiveType.I4:
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return KnownTypeCode.Int32;
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case PrimitiveType.I8:
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return KnownTypeCode.Int64;
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case PrimitiveType.R4:
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return KnownTypeCode.Single;
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case PrimitiveType.R8:
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case PrimitiveType.R:
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return KnownTypeCode.Double;
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case PrimitiveType.U1:
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return KnownTypeCode.Byte;
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case PrimitiveType.U2:
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return KnownTypeCode.UInt16;
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case PrimitiveType.U4:
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return KnownTypeCode.UInt32;
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case PrimitiveType.U8:
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return KnownTypeCode.UInt64;
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case PrimitiveType.I:
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return KnownTypeCode.IntPtr;
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case PrimitiveType.U:
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return KnownTypeCode.UIntPtr;
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default:
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return KnownTypeCode.None;
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}
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}
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public static KnownTypeCode ToKnownTypeCode(this StackType stackType, Sign sign = Sign.None)
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{
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switch (stackType)
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{
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case StackType.I4:
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return sign == Sign.Unsigned ? KnownTypeCode.UInt32 : KnownTypeCode.Int32;
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case StackType.I8:
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return sign == Sign.Unsigned ? KnownTypeCode.UInt64 : KnownTypeCode.Int64;
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case StackType.I:
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return sign == Sign.Unsigned ? KnownTypeCode.UIntPtr : KnownTypeCode.IntPtr;
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case StackType.F4:
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return KnownTypeCode.Single;
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case StackType.F8:
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return KnownTypeCode.Double;
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case StackType.O:
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return KnownTypeCode.Object;
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case StackType.Void:
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return KnownTypeCode.Void;
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default:
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return KnownTypeCode.None;
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}
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}
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public static PrimitiveType ToPrimitiveType(this StackType stackType, Sign sign = Sign.None)
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{
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switch (stackType)
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{
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case StackType.I4:
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return sign == Sign.Unsigned ? PrimitiveType.U4 : PrimitiveType.I4;
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case StackType.I8:
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return sign == Sign.Unsigned ? PrimitiveType.U8 : PrimitiveType.I8;
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case StackType.I:
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return sign == Sign.Unsigned ? PrimitiveType.U : PrimitiveType.I;
|
|
case StackType.F4:
|
|
return PrimitiveType.R4;
|
|
case StackType.F8:
|
|
return PrimitiveType.R8;
|
|
case StackType.Ref:
|
|
return PrimitiveType.Ref;
|
|
case StackType.Unknown:
|
|
return PrimitiveType.Unknown;
|
|
default:
|
|
return PrimitiveType.None;
|
|
}
|
|
}
|
|
}
|
|
|
|
public enum Sign : byte
|
|
{
|
|
None,
|
|
Signed,
|
|
Unsigned
|
|
}
|
|
}
|