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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Diagnostics;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Reflection
{
[Flags]
internal enum MdSigCallingConvention : byte
{
CallConvMask = 0x0f, // Calling convention is bottom 4 bits
Default = 0x00,
C = 0x01,
StdCall = 0x02,
ThisCall = 0x03,
FastCall = 0x04,
Vararg = 0x05,
Field = 0x06,
LocalSig = 0x07,
Property = 0x08,
Unmanaged = 0x09,
GenericInst = 0x0a, // generic method instantiation
Generic = 0x10, // Generic method sig with explicit number of type arguments (precedes ordinary parameter count)
HasThis = 0x20, // Top bit indicates a 'this' parameter
ExplicitThis = 0x40, // This parameter is explicitly in the signature
}
[Flags]
internal enum PInvokeAttributes
{
NoMangle = 0x0001,
CharSetMask = 0x0006,
CharSetNotSpec = 0x0000,
CharSetAnsi = 0x0002,
CharSetUnicode = 0x0004,
CharSetAuto = 0x0006,
BestFitUseAssem = 0x0000,
BestFitEnabled = 0x0010,
BestFitDisabled = 0x0020,
BestFitMask = 0x0030,
ThrowOnUnmappableCharUseAssem = 0x0000,
ThrowOnUnmappableCharEnabled = 0x1000,
ThrowOnUnmappableCharDisabled = 0x2000,
ThrowOnUnmappableCharMask = 0x3000,
SupportsLastError = 0x0040,
CallConvMask = 0x0700,
CallConvWinapi = 0x0100,
CallConvCdecl = 0x0200,
CallConvStdcall = 0x0300,
CallConvThiscall = 0x0400,
CallConvFastcall = 0x0500,
MaxValue = 0xFFFF,
}
[Flags]
internal enum MethodSemanticsAttributes
{
Setter = 0x0001,
Getter = 0x0002,
Other = 0x0004,
AddOn = 0x0008,
RemoveOn = 0x0010,
Fire = 0x0020,
}
internal enum MetadataTokenType
{
Module = 0x00000000,
TypeRef = 0x01000000,
TypeDef = 0x02000000,
FieldDef = 0x04000000,
MethodDef = 0x06000000,
ParamDef = 0x08000000,
InterfaceImpl = 0x09000000,
MemberRef = 0x0a000000,
CustomAttribute = 0x0c000000,
Permission = 0x0e000000,
Signature = 0x11000000,
Event = 0x14000000,
Property = 0x17000000,
ModuleRef = 0x1a000000,
TypeSpec = 0x1b000000,
Assembly = 0x20000000,
AssemblyRef = 0x23000000,
File = 0x26000000,
ExportedType = 0x27000000,
ManifestResource = 0x28000000,
GenericPar = 0x2a000000,
MethodSpec = 0x2b000000,
String = 0x70000000,
Name = 0x71000000,
BaseType = 0x72000000,
Invalid = 0x7FFFFFFF,
}
internal readonly struct ConstArray
{
// Keep the definition in sync with vm\ManagedMdImport.hpp
internal readonly int m_length;
internal readonly IntPtr m_constArray;
public IntPtr Signature => m_constArray;
public int Length => m_length;
public byte this[int index]
{
get
{
if (index < 0 || index >= m_length)
throw new IndexOutOfRangeException();
unsafe
{
return ((byte*)m_constArray.ToPointer())[index];
}
}
}
}
internal struct MetadataToken
{
public int Value;
public static implicit operator int(MetadataToken token) => token.Value;
public static implicit operator MetadataToken(int token) => new MetadataToken(token);
public static bool IsTokenOfType(int token, params MetadataTokenType[] types)
{
for (int i = 0; i < types.Length; i++)
{
if ((int)(token & 0xFF000000) == (int)types[i])
return true;
}
return false;
}
public static bool IsNullToken(int token) => (token & 0x00FFFFFF) == 0;
public MetadataToken(int token) { Value = token; }
public bool IsGlobalTypeDefToken => Value == 0x02000001;
public MetadataTokenType TokenType => (MetadataTokenType)(Value & 0xFF000000);
public bool IsTypeRef => TokenType == MetadataTokenType.TypeRef;
public bool IsTypeDef => TokenType == MetadataTokenType.TypeDef;
public bool IsFieldDef => TokenType == MetadataTokenType.FieldDef;
public bool IsMethodDef => TokenType == MetadataTokenType.MethodDef;
public bool IsMemberRef => TokenType == MetadataTokenType.MemberRef;
public bool IsEvent => TokenType == MetadataTokenType.Event;
public bool IsProperty => TokenType == MetadataTokenType.Property;
public bool IsParamDef => TokenType == MetadataTokenType.ParamDef;
public bool IsTypeSpec => TokenType == MetadataTokenType.TypeSpec;
public bool IsMethodSpec => TokenType == MetadataTokenType.MethodSpec;
public bool IsString => TokenType == MetadataTokenType.String;
public bool IsSignature => TokenType == MetadataTokenType.Signature;
public bool IsModule => TokenType == MetadataTokenType.Module;
public bool IsAssembly => TokenType == MetadataTokenType.Assembly;
public bool IsGenericPar => TokenType == MetadataTokenType.GenericPar;
public override string ToString() => string.Create(CultureInfo.InvariantCulture, stackalloc char[64], $"0x{Value:x8}");
}
internal ref struct MetadataEnumResult
{
internal int _length;
internal const int SmallIntArrayLength = 16;
[InlineArray(SmallIntArrayLength)]
internal struct SmallIntArray
{
public int e;
}
internal SmallIntArray _smallResult;
internal int[]? _largeResult;
public int Length => _length;
public int this[int index]
{
get
{
Debug.Assert(0 <= index && index < Length);
if (_largeResult != null)
return _largeResult[index];
return _smallResult[index];
}
}
}
#pragma warning disable CA1066 // IEquatable<MetadataImport> interface implementation isn't used
internal readonly partial struct MetadataImport
#pragma warning restore CA1067
{
private readonly IntPtr m_metadataImport2;
#region Override methods from Object
public override int GetHashCode()
{
return HashCode.Combine(m_metadataImport2);
}
public override bool Equals(object? obj)
{
if (!(obj is MetadataImport))
return false;
return Equals((MetadataImport)obj);
}
private bool Equals(MetadataImport import)
{
return import.m_metadataImport2 == m_metadataImport2;
}
#endregion
#region Static Members
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe bool GetMarshalAs(
IntPtr pNativeType,
int cNativeType,
out int unmanagedType,
out int safeArraySubType,
out byte* safeArrayUserDefinedSubType,
out int arraySubType,
out int sizeParamIndex,
out int sizeConst,
out byte* marshalType,
out byte* marshalCookie,
out int iidParamIndex);
internal static unsafe MarshalAsAttribute GetMarshalAs(ConstArray nativeType, RuntimeModule scope)
{
if (!GetMarshalAs(
nativeType.Signature,
nativeType.Length,
out int unmanagedTypeRaw,
out int safeArraySubTypeRaw,
out byte* safeArrayUserDefinedSubTypeRaw,
out int arraySubTypeRaw,
out int sizeParamIndex,
out int sizeConst,
out byte* marshalTypeRaw,
out byte* marshalCookieRaw,
out int iidParamIndex))
{
throw new BadImageFormatException();
}
string? safeArrayUserDefinedTypeName = safeArrayUserDefinedSubTypeRaw == null
? null
: Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(safeArrayUserDefinedSubTypeRaw));
string? marshalTypeName = marshalTypeRaw == null
? null
: Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(marshalTypeRaw));
string? marshalCookie = marshalCookieRaw == null
? null
: Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(marshalCookieRaw));
RuntimeType? safeArrayUserDefinedType = string.IsNullOrEmpty(safeArrayUserDefinedTypeName) ? null :
TypeNameResolver.GetTypeReferencedByCustomAttribute(safeArrayUserDefinedTypeName, scope);
RuntimeType? marshalTypeRef = null;
try
{
marshalTypeRef = marshalTypeName is null ? null : TypeNameResolver.GetTypeReferencedByCustomAttribute(marshalTypeName, scope);
}
catch (TypeLoadException)
{
// The user may have supplied a bad type name string causing this TypeLoadException
// Regardless, we return the bad type name
Debug.Assert(marshalTypeName is not null);
}
MarshalAsAttribute attribute = new MarshalAsAttribute((UnmanagedType)unmanagedTypeRaw);
attribute.SafeArraySubType = (VarEnum)safeArraySubTypeRaw;
attribute.SafeArrayUserDefinedSubType = safeArrayUserDefinedType;
attribute.IidParameterIndex = iidParamIndex;
attribute.ArraySubType = (UnmanagedType)arraySubTypeRaw;
attribute.SizeParamIndex = (short)sizeParamIndex;
attribute.SizeConst = sizeConst;
attribute.MarshalType = marshalTypeName;
attribute.MarshalTypeRef = marshalTypeRef;
attribute.MarshalCookie = marshalCookie;
return attribute;
}
#endregion
#region Constructor
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe IntPtr GetMetadataImport(RuntimeModule module);
internal MetadataImport(RuntimeModule module)
{
ArgumentNullException.ThrowIfNull(module);
// The MetadataImport instance needs to be acquired in this manner
// since the instance can be replaced during HotReload and EnC scenarios.
m_metadataImport2 = GetMetadataImport(module);
}
#endregion
[LibraryImport(RuntimeHelpers.QCall, EntryPoint = "MetadataImport_Enum")]
private static unsafe partial void Enum(IntPtr scope, int type, int parent, ref int length, int* shortResult, ObjectHandleOnStack longResult);
public unsafe void Enum(MetadataTokenType type, int parent, out MetadataEnumResult result)
{
result = default;
int length = MetadataEnumResult.SmallIntArrayLength;
fixed (int* p = &result._smallResult.e)
{
Enum(m_metadataImport2, (int)type, parent, ref length, p, ObjectHandleOnStack.Create(ref result._largeResult));
}
result._length = length;
}
public void EnumNestedTypes(int mdTypeDef, out MetadataEnumResult result)
{
Enum(MetadataTokenType.TypeDef, mdTypeDef, out result);
}
public void EnumCustomAttributes(int mdToken, out MetadataEnumResult result)
{
Enum(MetadataTokenType.CustomAttribute, mdToken, out result);
}
public void EnumParams(int mdMethodDef, out MetadataEnumResult result)
{
Enum(MetadataTokenType.ParamDef, mdMethodDef, out result);
}
public void EnumFields(int mdTypeDef, out MetadataEnumResult result)
{
Enum(MetadataTokenType.FieldDef, mdTypeDef, out result);
}
public void EnumProperties(int mdTypeDef, out MetadataEnumResult result)
{
Enum(MetadataTokenType.Property, mdTypeDef, out result);
}
public void EnumEvents(int mdTypeDef, out MetadataEnumResult result)
{
Enum(MetadataTokenType.Event, mdTypeDef, out result);
}
private static unsafe string? ConvertMetadataStringPermitInvalidContent(char* stringMetadataEncoding, int length)
{
Debug.Assert(stringMetadataEncoding != null);
// Metadata encoding is always UTF-16LE, but user strings can be leveraged to encode invalid surrogates.
// This means we rely on the string's constructor rather than the stricter Encoding.Unicode API.
return new string(stringMetadataEncoding, 0, length);
}
#region FCalls
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetDefaultValue(
IntPtr scope,
int mdToken,
out long value,
out char* stringMetadataEncoding,
out int length,
out int corElementType);
public unsafe string? GetDefaultValue(int mdToken, out long value, out int length, out CorElementType corElementType)
{
ThrowBadImageExceptionForHR(GetDefaultValue(m_metadataImport2, mdToken, out value, out char* stringMetadataEncoding, out length, out int corElementTypeRaw));
corElementType = (CorElementType)corElementTypeRaw;
if (corElementType is CorElementType.ELEMENT_TYPE_STRING
&& stringMetadataEncoding != null)
{
return ConvertMetadataStringPermitInvalidContent(stringMetadataEncoding, length);
}
return null;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetUserString(IntPtr scope, int mdToken, out char* stringMetadataEncoding, out int length);
public unsafe string? GetUserString(int mdToken)
{
ThrowBadImageExceptionForHR(GetUserString(m_metadataImport2, mdToken, out char* stringMetadataEncoding, out int length));
return stringMetadataEncoding != null ?
ConvertMetadataStringPermitInvalidContent(stringMetadataEncoding, length) :
null;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetName(IntPtr scope, int mdToken, out byte* name);
public unsafe MdUtf8String GetName(int mdToken)
{
ThrowBadImageExceptionForHR(GetName(m_metadataImport2, mdToken, out byte* name));
return new MdUtf8String(name);
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetNamespace(IntPtr scope, int mdToken, out byte* namesp);
public unsafe MdUtf8String GetNamespace(int mdToken)
{
ThrowBadImageExceptionForHR(GetNamespace(m_metadataImport2, mdToken, out byte* namesp));
return new MdUtf8String(namesp);
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetEventProps(IntPtr scope, int mdToken, out void* name, out int eventAttributes);
public unsafe void GetEventProps(int mdToken, out void* name, out EventAttributes eventAttributes)
{
ThrowBadImageExceptionForHR(GetEventProps(m_metadataImport2, mdToken, out name, out int eventAttributesRaw));
eventAttributes = (EventAttributes)eventAttributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetFieldDefProps(IntPtr scope, int mdToken, out int fieldAttributes);
public void GetFieldDefProps(int mdToken, out FieldAttributes fieldAttributes)
{
ThrowBadImageExceptionForHR(GetFieldDefProps(m_metadataImport2, mdToken, out int fieldAttributesRaw));
fieldAttributes = (FieldAttributes)fieldAttributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetPropertyProps(IntPtr scope, int mdToken, out void* name, out int propertyAttributes, out ConstArray signature);
public unsafe void GetPropertyProps(int mdToken, out void* name, out PropertyAttributes propertyAttributes, out ConstArray signature)
{
ThrowBadImageExceptionForHR(GetPropertyProps(m_metadataImport2, mdToken, out name, out int propertyAttributesRaw, out signature));
propertyAttributes = (PropertyAttributes)propertyAttributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetParentToken(IntPtr scope, int mdToken, out int tkParent);
public int GetParentToken(int tkToken)
{
ThrowBadImageExceptionForHR(GetParentToken(m_metadataImport2, tkToken, out int tkParent));
return tkParent;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetParamDefProps(IntPtr scope, int parameterToken, out int sequence, out int attributes);
public void GetParamDefProps(int parameterToken, out int sequence, out ParameterAttributes attributes)
{
ThrowBadImageExceptionForHR(GetParamDefProps(m_metadataImport2, parameterToken, out sequence, out int attributesRaw));
attributes = (ParameterAttributes)attributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetGenericParamProps(IntPtr scope, int genericParameter, out int flags);
public void GetGenericParamProps(
int genericParameter,
out GenericParameterAttributes attributes)
{
ThrowBadImageExceptionForHR(GetGenericParamProps(m_metadataImport2, genericParameter, out int attributesRaw));
attributes = (GenericParameterAttributes)attributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetScopeProps(IntPtr scope, out Guid mvid);
public void GetScopeProps(out Guid mvid)
{
ThrowBadImageExceptionForHR(GetScopeProps(m_metadataImport2, out mvid));
}
public ConstArray GetMethodSignature(MetadataToken token)
{
if (token.IsMemberRef)
return GetMemberRefProps(token);
return GetSigOfMethodDef(token);
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetSigOfMethodDef(IntPtr scope, int methodToken, ref ConstArray signature);
public ConstArray GetSigOfMethodDef(int methodToken)
{
ConstArray signature = default;
ThrowBadImageExceptionForHR(GetSigOfMethodDef(m_metadataImport2, methodToken, ref signature));
return signature;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetSignatureFromToken(IntPtr scope, int methodToken, ref ConstArray signature);
public ConstArray GetSignatureFromToken(int token)
{
ConstArray signature = default;
ThrowBadImageExceptionForHR(GetSignatureFromToken(m_metadataImport2, token, ref signature));
return signature;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetMemberRefProps(IntPtr scope, int memberTokenRef, out ConstArray signature);
public ConstArray GetMemberRefProps(int memberTokenRef)
{
ThrowBadImageExceptionForHR(GetMemberRefProps(m_metadataImport2, memberTokenRef, out ConstArray signature));
return signature;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetCustomAttributeProps(IntPtr scope,
int customAttributeToken,
out int constructorToken,
out ConstArray signature);
public void GetCustomAttributeProps(
int customAttributeToken,
out int constructorToken,
out ConstArray signature)
{
ThrowBadImageExceptionForHR(GetCustomAttributeProps(m_metadataImport2, customAttributeToken, out constructorToken, out signature));
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetClassLayout(IntPtr scope, int typeTokenDef, out int packSize, out int classSize);
public void GetClassLayout(
int typeTokenDef,
out int packSize,
out int classSize)
{
ThrowBadImageExceptionForHR(GetClassLayout(m_metadataImport2, typeTokenDef, out packSize, out classSize));
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetFieldOffset(IntPtr scope, int typeTokenDef, int fieldTokenDef, out int offset, out bool found);
public bool GetFieldOffset(
int typeTokenDef,
int fieldTokenDef,
out int offset)
{
int hr = GetFieldOffset(m_metadataImport2, typeTokenDef, fieldTokenDef, out offset, out bool found);
if (!found && hr < 0)
{
throw new BadImageFormatException();
}
return found;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetSigOfFieldDef(IntPtr scope, int fieldToken, ref ConstArray fieldMarshal);
public ConstArray GetSigOfFieldDef(int fieldToken)
{
ConstArray sig = default;
ThrowBadImageExceptionForHR(GetSigOfFieldDef(m_metadataImport2, fieldToken, ref sig));
return sig;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern int GetFieldMarshal(IntPtr scope, int fieldToken, ref ConstArray fieldMarshal);
public ConstArray GetFieldMarshal(int fieldToken)
{
ConstArray fieldMarshal = default;
ThrowBadImageExceptionForHR(GetFieldMarshal(m_metadataImport2, fieldToken, ref fieldMarshal));
return fieldMarshal;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern unsafe int GetPInvokeMap(IntPtr scope,
int token,
out int attributes,
out byte* importName,
out byte* importDll);
public unsafe void GetPInvokeMap(
int token,
out PInvokeAttributes attributes,
out string importName,
out string importDll)
{
ThrowBadImageExceptionForHR(GetPInvokeMap(m_metadataImport2, token, out int attributesRaw, out byte* importNameRaw, out byte* importDllRaw));
importName = Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(importNameRaw));
importDll = Text.Encoding.UTF8.GetString(MemoryMarshal.CreateReadOnlySpanFromNullTerminated(importDllRaw));
attributes = (PInvokeAttributes)attributesRaw;
}
[MethodImpl(MethodImplOptions.InternalCall)]
private static extern bool IsValidToken(IntPtr scope, int token);
public bool IsValidToken(int token)
{
return IsValidToken(m_metadataImport2, token);
}
#endregion
private static void ThrowBadImageExceptionForHR(int hr)
{
if (hr < 0)
{
throw new BadImageFormatException();
}
}
}
}
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