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.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
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ILSpy/ICSharpCode.Decompiler/TypeSystem/TypeUtils.cs

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// Copyright (c) 2015 Siegfried Pammer
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using ICSharpCode.Decompiler.IL;
using ICSharpCode.Decompiler.TypeSystem.Implementation;
namespace ICSharpCode.Decompiler.TypeSystem
{
public static class TypeUtils
{
public const int NativeIntSize = 6; // between 4 (Int32) and 8 (Int64)
/// <summary>
/// Gets the size (in bytes) of the input type.
/// Returns <c>NativeIntSize</c> for pointer-sized types.
/// Returns 0 for structs and other types of unknown size.
/// </summary>
public static int GetSize(this IType type)
{
switch (type.Kind)
{
case TypeKind.Pointer:
case TypeKind.ByReference:
case TypeKind.Class:
case TypeKind.NInt:
case TypeKind.NUInt:
return NativeIntSize;
case TypeKind.Enum:
type = type.GetEnumUnderlyingType();
break;
case TypeKind.ModOpt:
case TypeKind.ModReq:
return type.SkipModifiers().GetSize();
}
var typeDef = type.GetDefinition();
if (typeDef == null)
return 0;
switch (typeDef.KnownTypeCode)
{
case KnownTypeCode.Boolean:
case KnownTypeCode.SByte:
case KnownTypeCode.Byte:
return 1;
case KnownTypeCode.Char:
case KnownTypeCode.Int16:
case KnownTypeCode.UInt16:
return 2;
case KnownTypeCode.Int32:
case KnownTypeCode.UInt32:
case KnownTypeCode.Single:
return 4;
case KnownTypeCode.IntPtr:
case KnownTypeCode.UIntPtr:
return NativeIntSize;
case KnownTypeCode.Int64:
case KnownTypeCode.UInt64:
case KnownTypeCode.Double:
return 8;
}
return 0;
}
/// <summary>
/// Gets the size of the input stack type.
/// </summary>
/// <returns>
/// * 4 for <c>I4</c>,
/// * 8 for <c>I8</c>,
/// * <c>NativeIntSize</c> for <c>I</c> and <c>Ref</c>,
/// * 0 otherwise (O, F, Void, Unknown).
/// </returns>
public static int GetSize(this StackType type)
{
switch (type)
{
case StackType.I4:
return 4;
case StackType.I8:
return 8;
case StackType.I:
case StackType.Ref:
return NativeIntSize;
default:
return 0;
}
}
public static IType GetLargerType(IType type1, IType type2)
{
return GetSize(type1) >= GetSize(type2) ? type1 : type2;
}
/// <summary>
/// Gets whether the type is a small integer type.
/// Small integer types are:
/// * bool, sbyte, byte, char, short, ushort
/// * any enums that have a small integer type as underlying type
/// </summary>
public static bool IsSmallIntegerType(this IType type)
{
int size = GetSize(type);
return size > 0 && size < 4;
}
/// <summary>
/// Gets whether the type is a C# small integer type: byte, sbyte, short or ushort.
///
/// Unlike the ILAst, C# does not consider bool, char or enums to be small integers.
/// </summary>
public static bool IsCSharpSmallIntegerType(this IType type)
{
switch (type.GetDefinition()?.KnownTypeCode)
{
case KnownTypeCode.Byte:
case KnownTypeCode.SByte:
case KnownTypeCode.Int16:
case KnownTypeCode.UInt16:
return true;
default:
return false;
}
}
/// <summary>
/// Gets whether the type is a C# 9 native integer type: nint or nuint.
///
/// Returns false for (U)IntPtr.
/// </summary>
public static bool IsCSharpNativeIntegerType(this IType type)
{
switch (type.Kind)
{
case TypeKind.NInt:
case TypeKind.NUInt:
return true;
default:
return false;
}
}
/// <summary>
/// Gets whether the type is a C# primitive integer type: byte, sbyte, short, ushort, int, uint, long and ulong.
///
/// Unlike the ILAst, C# does not consider bool, enums, pointers or IntPtr to be integers.
/// </summary>
public static bool IsCSharpPrimitiveIntegerType(this IType type)
{
switch (type.GetDefinition()?.KnownTypeCode)
{
case KnownTypeCode.Byte:
case KnownTypeCode.SByte:
case KnownTypeCode.Int16:
case KnownTypeCode.UInt16:
case KnownTypeCode.Int32:
case KnownTypeCode.UInt32:
case KnownTypeCode.Int64:
case KnownTypeCode.UInt64:
return true;
default:
return false;
}
}
/// <summary>
/// Gets whether the type is an IL integer type.
/// Returns true for I4, I, or I8.
/// </summary>
public static bool IsIntegerType(this StackType type)
{
switch (type)
{
case StackType.I4:
case StackType.I:
case StackType.I8:
return true;
default:
return false;
}
}
/// <summary>
/// Gets whether the type is an IL floating point type.
/// Returns true for F4 or F8.
/// </summary>
public static bool IsFloatType(this StackType type)
{
switch (type)
{
case StackType.F4:
case StackType.F8:
return true;
default:
return false;
}
}
/// <summary>
/// Gets whether reading/writing an element of accessType from the pointer
/// is equivalent to reading/writing an element of the pointer's element type.
/// </summary>
/// <remarks>
/// The access semantics may sligthly differ on read accesses of small integer types,
/// due to zero extension vs. sign extension when the signs differ.
/// </remarks>
public static bool IsCompatiblePointerTypeForMemoryAccess(IType pointerType, IType accessType)
{
IType memoryType;
if (pointerType is PointerType || pointerType is ByReferenceType)
memoryType = ((TypeWithElementType)pointerType).ElementType;
else
return false;
return IsCompatibleTypeForMemoryAccess(memoryType, accessType);
}
/// <summary>
/// Gets whether reading/writing an element of accessType from the pointer
/// is equivalent to reading/writing an element of the memoryType.
/// </summary>
/// <remarks>
/// The access semantics may sligthly differ on read accesses of small integer types,
/// due to zero extension vs. sign extension when the signs differ.
/// </remarks>
public static bool IsCompatibleTypeForMemoryAccess(IType memoryType, IType accessType)
{
memoryType = memoryType.AcceptVisitor(NormalizeTypeVisitor.TypeErasure);
accessType = accessType.AcceptVisitor(NormalizeTypeVisitor.TypeErasure);
if (memoryType.Equals(accessType))
return true;
// If the types are not equal, the access still might produce equal results in some cases:
// 1) Both types are reference types
if (memoryType.IsReferenceType == true && accessType.IsReferenceType == true)
return true;
// 2) Both types are integer types of equal size
StackType memoryStackType = memoryType.GetStackType();
StackType accessStackType = accessType.GetStackType();
if (memoryStackType == accessStackType && memoryStackType.IsIntegerType() && GetSize(memoryType) == GetSize(accessType))
return true;
// 3) Any of the types is unknown: we assume they are compatible.
return memoryType.Kind == TypeKind.Unknown || accessType.Kind == TypeKind.Unknown;
}
/// <summary>
/// Gets the stack type corresponding to this type.
/// </summary>
public static StackType GetStackType(this IType type)
{
switch (type.Kind)
{
case TypeKind.Unknown:
if (type.IsReferenceType == true)
{
return StackType.O;
}
return StackType.Unknown;
case TypeKind.ByReference:
return StackType.Ref;
case TypeKind.Pointer:
case TypeKind.NInt:
case TypeKind.NUInt:
case TypeKind.FunctionPointer:
return StackType.I;
case TypeKind.TypeParameter:
// Type parameters are always considered StackType.O, even
// though they might be instantiated with primitive types.
return StackType.O;
case TypeKind.ModOpt:
case TypeKind.ModReq:
return type.SkipModifiers().GetStackType();
}
ITypeDefinition typeDef = type.GetEnumUnderlyingType().GetDefinition();
if (typeDef == null)
return StackType.O;
switch (typeDef.KnownTypeCode)
{
case KnownTypeCode.Boolean:
case KnownTypeCode.Char:
case KnownTypeCode.SByte:
case KnownTypeCode.Byte:
case KnownTypeCode.Int16:
case KnownTypeCode.UInt16:
case KnownTypeCode.Int32:
case KnownTypeCode.UInt32:
return StackType.I4;
case KnownTypeCode.Int64:
case KnownTypeCode.UInt64:
return StackType.I8;
case KnownTypeCode.Single:
return StackType.F4;
case KnownTypeCode.Double:
return StackType.F8;
case KnownTypeCode.Void:
return StackType.Void;
case KnownTypeCode.IntPtr:
case KnownTypeCode.UIntPtr:
return StackType.I;
default:
return StackType.O;
}
}
/// <summary>
/// If type is an enumeration type, returns the underlying type.
/// Otherwise, returns type unmodified.
/// </summary>
public static IType GetEnumUnderlyingType(this IType type)
{
type = type.SkipModifiers();
return (type.Kind == TypeKind.Enum) ? type.GetDefinition().EnumUnderlyingType : type;
}
/// <summary>
/// Gets the sign of the input type.
/// </summary>
/// <remarks>
/// Integer types (including IntPtr/UIntPtr) return the sign as expected.
/// Floating point types and <c>decimal</c> are considered to be signed.
/// <c>char</c>, <c>bool</c> and pointer types (e.g. <c>void*</c>) are unsigned.
/// Enums have a sign based on their underlying type.
/// All other types return <c>Sign.None</c>.
/// </remarks>
public static Sign GetSign(this IType type)
{
type = type.SkipModifiers();
switch (type.Kind)
{
case TypeKind.Pointer:
case TypeKind.NUInt:
case TypeKind.FunctionPointer:
return Sign.Unsigned;
case TypeKind.NInt:
return Sign.Signed;
}
var typeDef = type.GetEnumUnderlyingType().GetDefinition();
if (typeDef == null)
return Sign.None;
switch (typeDef.KnownTypeCode)
{
case KnownTypeCode.SByte:
case KnownTypeCode.Int16:
case KnownTypeCode.Int32:
case KnownTypeCode.Int64:
case KnownTypeCode.IntPtr:
case KnownTypeCode.Single:
case KnownTypeCode.Double:
case KnownTypeCode.Decimal:
return Sign.Signed;
case KnownTypeCode.UIntPtr:
case KnownTypeCode.Char:
case KnownTypeCode.Boolean:
case KnownTypeCode.Byte:
case KnownTypeCode.UInt16:
case KnownTypeCode.UInt32:
case KnownTypeCode.UInt64:
return Sign.Unsigned;
default:
return Sign.None;
}
}
/// <summary>
/// Maps the KnownTypeCode values to the corresponding PrimitiveTypes.
/// </summary>
public static PrimitiveType ToPrimitiveType(this KnownTypeCode knownTypeCode)
{
switch (knownTypeCode)
{
case KnownTypeCode.SByte:
return PrimitiveType.I1;
case KnownTypeCode.Int16:
return PrimitiveType.I2;
case KnownTypeCode.Int32:
return PrimitiveType.I4;
case KnownTypeCode.Int64:
return PrimitiveType.I8;
case KnownTypeCode.Single:
return PrimitiveType.R4;
case KnownTypeCode.Double:
return PrimitiveType.R8;
case KnownTypeCode.Byte:
return PrimitiveType.U1;
case KnownTypeCode.UInt16:
case KnownTypeCode.Char:
return PrimitiveType.U2;
case KnownTypeCode.UInt32:
return PrimitiveType.U4;
case KnownTypeCode.UInt64:
return PrimitiveType.U8;
case KnownTypeCode.IntPtr:
return PrimitiveType.I;
case KnownTypeCode.UIntPtr:
return PrimitiveType.U;
default:
return PrimitiveType.None;
}
}
/// <summary>
/// Maps the KnownTypeCode values to the corresponding PrimitiveTypes.
/// </summary>
public static PrimitiveType ToPrimitiveType(this IType type)
{
type = type.SkipModifiers();
switch (type.Kind)
{
case TypeKind.Unknown:
return PrimitiveType.Unknown;
case TypeKind.ByReference:
return PrimitiveType.Ref;
case TypeKind.NInt:
case TypeKind.FunctionPointer:
return PrimitiveType.I;
case TypeKind.NUInt:
return PrimitiveType.U;
}
var def = type.GetEnumUnderlyingType().GetDefinition();
return def != null ? def.KnownTypeCode.ToPrimitiveType() : PrimitiveType.None;
}
/// <summary>
/// Maps the PrimitiveType values to the corresponding KnownTypeCodes.
/// </summary>
public static KnownTypeCode ToKnownTypeCode(this PrimitiveType primitiveType)
{
switch (primitiveType)
{
case PrimitiveType.I1:
return KnownTypeCode.SByte;
case PrimitiveType.I2:
return KnownTypeCode.Int16;
case PrimitiveType.I4:
return KnownTypeCode.Int32;
case PrimitiveType.I8:
return KnownTypeCode.Int64;
case PrimitiveType.R4:
return KnownTypeCode.Single;
case PrimitiveType.R8:
case PrimitiveType.R:
return KnownTypeCode.Double;
case PrimitiveType.U1:
return KnownTypeCode.Byte;
case PrimitiveType.U2:
return KnownTypeCode.UInt16;
case PrimitiveType.U4:
return KnownTypeCode.UInt32;
case PrimitiveType.U8:
return KnownTypeCode.UInt64;
case PrimitiveType.I:
return KnownTypeCode.IntPtr;
case PrimitiveType.U:
return KnownTypeCode.UIntPtr;
default:
return KnownTypeCode.None;
}
}
public static KnownTypeCode ToKnownTypeCode(this StackType stackType, Sign sign = Sign.None)
{
switch (stackType)
{
case StackType.I4:
return sign == Sign.Unsigned ? KnownTypeCode.UInt32 : KnownTypeCode.Int32;
case StackType.I8:
return sign == Sign.Unsigned ? KnownTypeCode.UInt64 : KnownTypeCode.Int64;
case StackType.I:
return sign == Sign.Unsigned ? KnownTypeCode.UIntPtr : KnownTypeCode.IntPtr;
case StackType.F4:
return KnownTypeCode.Single;
case StackType.F8:
return KnownTypeCode.Double;
case StackType.O:
return KnownTypeCode.Object;
case StackType.Void:
return KnownTypeCode.Void;
default:
return KnownTypeCode.None;
}
}
public static PrimitiveType ToPrimitiveType(this StackType stackType, Sign sign = Sign.None)
{
switch (stackType)
{
case StackType.I4:
return sign == Sign.Unsigned ? PrimitiveType.U4 : PrimitiveType.I4;
case StackType.I8:
return sign == Sign.Unsigned ? PrimitiveType.U8 : PrimitiveType.I8;
case StackType.I:
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
}
}