diff options
Diffstat (limited to 'src/mscorlib/src/System/Reflection/RuntimeParameterInfo.cs')
| -rw-r--r-- | src/mscorlib/src/System/Reflection/RuntimeParameterInfo.cs | 528 |
1 files changed, 528 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Reflection/RuntimeParameterInfo.cs b/src/mscorlib/src/System/Reflection/RuntimeParameterInfo.cs new file mode 100644 index 0000000000..addf68e75d --- /dev/null +++ b/src/mscorlib/src/System/Reflection/RuntimeParameterInfo.cs @@ -0,0 +1,528 @@ +// Licensed to the .NET Foundation under one or more agreements. +// The .NET Foundation licenses this file to you under the MIT license. +// See the LICENSE file in the project root for more information. + +using System.Collections.Generic; +using System.Diagnostics; +using System.Diagnostics.Contracts; +using System.Runtime.Serialization; +using System.Runtime.CompilerServices; +using MdToken = System.Reflection.MetadataToken; + +namespace System.Reflection +{ + [Serializable] + internal unsafe sealed class RuntimeParameterInfo : ParameterInfo, ISerializable + { + #region Static Members + internal unsafe static ParameterInfo[] GetParameters(IRuntimeMethodInfo method, MemberInfo member, Signature sig) + { + Debug.Assert(method is RuntimeMethodInfo || method is RuntimeConstructorInfo); + + ParameterInfo dummy; + return GetParameters(method, member, sig, out dummy, false); + } + + internal unsafe static ParameterInfo GetReturnParameter(IRuntimeMethodInfo method, MemberInfo member, Signature sig) + { + Debug.Assert(method is RuntimeMethodInfo || method is RuntimeConstructorInfo); + + ParameterInfo returnParameter; + GetParameters(method, member, sig, out returnParameter, true); + return returnParameter; + } + + internal unsafe static ParameterInfo[] GetParameters( + IRuntimeMethodInfo methodHandle, MemberInfo member, Signature sig, out ParameterInfo returnParameter, bool fetchReturnParameter) + { + returnParameter = null; + int sigArgCount = sig.Arguments.Length; + ParameterInfo[] args = fetchReturnParameter ? null : new ParameterInfo[sigArgCount]; + + int tkMethodDef = RuntimeMethodHandle.GetMethodDef(methodHandle); + int cParamDefs = 0; + + // Not all methods have tokens. Arrays, pointers and byRef types do not have tokens as they + // are generated on the fly by the runtime. + if (!MdToken.IsNullToken(tkMethodDef)) + { + MetadataImport scope = RuntimeTypeHandle.GetMetadataImport(RuntimeMethodHandle.GetDeclaringType(methodHandle)); + + MetadataEnumResult tkParamDefs; + scope.EnumParams(tkMethodDef, out tkParamDefs); + + cParamDefs = tkParamDefs.Length; + + // Not all parameters have tokens. Parameters may have no token + // if they have no name and no attributes. + if (cParamDefs > sigArgCount + 1 /* return type */) + throw new BadImageFormatException(SR.BadImageFormat_ParameterSignatureMismatch); + + for (int i = 0; i < cParamDefs; i++) + { + #region Populate ParameterInfos + ParameterAttributes attr; + int position, tkParamDef = tkParamDefs[i]; + + scope.GetParamDefProps(tkParamDef, out position, out attr); + + position--; + + if (fetchReturnParameter == true && position == -1) + { + // more than one return parameter? + if (returnParameter != null) + throw new BadImageFormatException(SR.BadImageFormat_ParameterSignatureMismatch); + + returnParameter = new RuntimeParameterInfo(sig, scope, tkParamDef, position, attr, member); + } + else if (fetchReturnParameter == false && position >= 0) + { + // position beyong sigArgCount? + if (position >= sigArgCount) + throw new BadImageFormatException(SR.BadImageFormat_ParameterSignatureMismatch); + + args[position] = new RuntimeParameterInfo(sig, scope, tkParamDef, position, attr, member); + } + #endregion + } + } + + // Fill in empty ParameterInfos for those without tokens + if (fetchReturnParameter) + { + if (returnParameter == null) + { + returnParameter = new RuntimeParameterInfo(sig, MetadataImport.EmptyImport, 0, -1, (ParameterAttributes)0, member); + } + } + else + { + if (cParamDefs < args.Length + 1) + { + for (int i = 0; i < args.Length; i++) + { + if (args[i] != null) + continue; + + args[i] = new RuntimeParameterInfo(sig, MetadataImport.EmptyImport, 0, i, (ParameterAttributes)0, member); + } + } + } + + return args; + } + #endregion + + #region Private Statics + private static readonly Type s_DecimalConstantAttributeType = typeof(DecimalConstantAttribute); + private static readonly Type s_CustomConstantAttributeType = typeof(CustomConstantAttribute); + #endregion + + #region Private Data Members + // These are new in Whidbey, so we cannot serialize them directly or we break backwards compatibility. + [NonSerialized] + private int m_tkParamDef; + [NonSerialized] + private MetadataImport m_scope; + [NonSerialized] + private Signature m_signature; + [NonSerialized] + private volatile bool m_nameIsCached = false; + [NonSerialized] + private readonly bool m_noMetadata = false; + [NonSerialized] + private bool m_noDefaultValue = false; + [NonSerialized] + private MethodBase m_originalMember = null; + #endregion + + #region Internal Properties + internal MethodBase DefiningMethod + { + get + { + MethodBase result = m_originalMember != null ? m_originalMember : MemberImpl as MethodBase; + Debug.Assert(result != null); + return result; + } + } + #endregion + + #region Internal Methods + internal void SetName(string name) + { + NameImpl = name; + } + + internal void SetAttributes(ParameterAttributes attributes) + { + AttrsImpl = attributes; + } + #endregion + + #region VTS magic to serialize/deserialized to/from pre-Whidbey endpoints. + public void GetObjectData(SerializationInfo info, StreamingContext context) + { + if (info == null) + throw new ArgumentNullException(nameof(info)); + Contract.EndContractBlock(); + + // We could be serializing for consumption by a pre-Whidbey + // endpoint. Therefore we set up all the serialized fields to look + // just like a v1.0/v1.1 instance. + + // Need to set the type to ParameterInfo so that pre-Whidbey and Whidbey code + // can deserialize this. This is also why we cannot simply use [OnSerializing]. + info.SetType(typeof(ParameterInfo)); + + // Use the properties intead of the fields in case the fields haven't been et + // _importer, bExtraConstChecked, and m_cachedData don't need to be set + + // Now set the legacy fields that the current implementation doesn't + // use any more. Note that _importer is a raw pointer that should + // never have been serialized in V1. We set it to zero here; if the + // deserializer uses it (by calling GetCustomAttributes() on this + // instance) they'll AV, but at least it will be a well defined + // exception and not a random AV. + + info.AddValue("AttrsImpl", Attributes); + info.AddValue("ClassImpl", ParameterType); + info.AddValue("DefaultValueImpl", DefaultValue); + info.AddValue("MemberImpl", Member); + info.AddValue("NameImpl", Name); + info.AddValue("PositionImpl", Position); + info.AddValue("_token", m_tkParamDef); + } + #endregion + + #region Constructor + // used by RuntimePropertyInfo + internal RuntimeParameterInfo(RuntimeParameterInfo accessor, RuntimePropertyInfo property) + : this(accessor, (MemberInfo)property) + { + m_signature = property.Signature; + } + + private RuntimeParameterInfo(RuntimeParameterInfo accessor, MemberInfo member) + { + // Change ownership + MemberImpl = member; + + // The original owner should always be a method, because this method is only used to + // change the owner from a method to a property. + m_originalMember = accessor.MemberImpl as MethodBase; + Debug.Assert(m_originalMember != null); + + // Populate all the caches -- we inherit this behavior from RTM + NameImpl = accessor.Name; + m_nameIsCached = true; + ClassImpl = accessor.ParameterType; + PositionImpl = accessor.Position; + AttrsImpl = accessor.Attributes; + + // Strictly speeking, property's don't contain paramter tokens + // However we need this to make ca's work... oh well... + m_tkParamDef = MdToken.IsNullToken(accessor.MetadataToken) ? (int)MetadataTokenType.ParamDef : accessor.MetadataToken; + m_scope = accessor.m_scope; + } + + private RuntimeParameterInfo( + Signature signature, MetadataImport scope, int tkParamDef, + int position, ParameterAttributes attributes, MemberInfo member) + { + Contract.Requires(member != null); + Debug.Assert(MdToken.IsNullToken(tkParamDef) == scope.Equals(MetadataImport.EmptyImport)); + Debug.Assert(MdToken.IsNullToken(tkParamDef) || MdToken.IsTokenOfType(tkParamDef, MetadataTokenType.ParamDef)); + + PositionImpl = position; + MemberImpl = member; + m_signature = signature; + m_tkParamDef = MdToken.IsNullToken(tkParamDef) ? (int)MetadataTokenType.ParamDef : tkParamDef; + m_scope = scope; + AttrsImpl = attributes; + + ClassImpl = null; + NameImpl = null; + } + + // ctor for no metadata MethodInfo in the DynamicMethod and RuntimeMethodInfo cases + internal RuntimeParameterInfo(MethodInfo owner, String name, Type parameterType, int position) + { + MemberImpl = owner; + NameImpl = name; + m_nameIsCached = true; + m_noMetadata = true; + ClassImpl = parameterType; + PositionImpl = position; + AttrsImpl = ParameterAttributes.None; + m_tkParamDef = (int)MetadataTokenType.ParamDef; + m_scope = MetadataImport.EmptyImport; + } + #endregion + + #region Public Methods + public override Type ParameterType + { + get + { + // only instance of ParameterInfo has ClassImpl, all its subclasses don't + if (ClassImpl == null) + { + RuntimeType parameterType; + if (PositionImpl == -1) + parameterType = m_signature.ReturnType; + else + parameterType = m_signature.Arguments[PositionImpl]; + + Debug.Assert(parameterType != null); + // different thread could only write ClassImpl to the same value, so a race condition is not a problem here + ClassImpl = parameterType; + } + + return ClassImpl; + } + } + + public override String Name + { + get + { + if (!m_nameIsCached) + { + if (!MdToken.IsNullToken(m_tkParamDef)) + { + string name; + name = m_scope.GetName(m_tkParamDef).ToString(); + NameImpl = name; + } + + // other threads could only write it to true, so a race condition is OK + // this field is volatile, so the write ordering is guaranteed + m_nameIsCached = true; + } + + // name may be null + return NameImpl; + } + } + + public override bool HasDefaultValue + { + get + { + if (m_noMetadata || m_noDefaultValue) + return false; + + object defaultValue = GetDefaultValueInternal(false); + + return (defaultValue != DBNull.Value); + } + } + + public override Object DefaultValue { get { return GetDefaultValue(false); } } + public override Object RawDefaultValue { get { return GetDefaultValue(true); } } + + private Object GetDefaultValue(bool raw) + { + // OLD COMMENT (Is this even true?) + // Cannot cache because default value could be non-agile user defined enumeration. + // OLD COMMENT ends + if (m_noMetadata) + return null; + + // for dynamic method we pretend to have cached the value so we do not go to metadata + object defaultValue = GetDefaultValueInternal(raw); + + if (defaultValue == DBNull.Value) + { + #region Handle case if no default value was found + if (IsOptional) + { + // If the argument is marked as optional then the default value is Missing.Value. + defaultValue = Type.Missing; + } + #endregion + } + + return defaultValue; + } + + // returns DBNull.Value if the parameter doesn't have a default value + private Object GetDefaultValueInternal(bool raw) + { + Debug.Assert(!m_noMetadata); + + if (m_noDefaultValue) + return DBNull.Value; + + object defaultValue = null; + + // Why check the parameter type only for DateTime and only for the ctor arguments? + // No check on the parameter type is done for named args and for Decimal. + + // We should move this after MdToken.IsNullToken(m_tkParamDef) and combine it + // with the other custom attribute logic. But will that be a breaking change? + // For a DateTime parameter on which both an md constant and a ca constant are set, + // which one should win? + if (ParameterType == typeof(DateTime)) + { + if (raw) + { + CustomAttributeTypedArgument value = + CustomAttributeData.Filter( + CustomAttributeData.GetCustomAttributes(this), typeof(DateTimeConstantAttribute), 0); + + if (value.ArgumentType != null) + return new DateTime((long)value.Value); + } + else + { + object[] dt = GetCustomAttributes(typeof(DateTimeConstantAttribute), false); + if (dt != null && dt.Length != 0) + return ((DateTimeConstantAttribute)dt[0]).Value; + } + } + + #region Look for a default value in metadata + if (!MdToken.IsNullToken(m_tkParamDef)) + { + // This will return DBNull.Value if no constant value is defined on m_tkParamDef in the metadata. + defaultValue = MdConstant.GetValue(m_scope, m_tkParamDef, ParameterType.GetTypeHandleInternal(), raw); + } + #endregion + + if (defaultValue == DBNull.Value) + { + #region Look for a default value in the custom attributes + if (raw) + { + foreach (CustomAttributeData attr in CustomAttributeData.GetCustomAttributes(this)) + { + Type attrType = attr.Constructor.DeclaringType; + + if (attrType == typeof(DateTimeConstantAttribute)) + { + defaultValue = DateTimeConstantAttribute.GetRawDateTimeConstant(attr); + } + else if (attrType == typeof(DecimalConstantAttribute)) + { + defaultValue = DecimalConstantAttribute.GetRawDecimalConstant(attr); + } + else if (attrType.IsSubclassOf(s_CustomConstantAttributeType)) + { + defaultValue = CustomConstantAttribute.GetRawConstant(attr); + } + } + } + else + { + Object[] CustomAttrs = GetCustomAttributes(s_CustomConstantAttributeType, false); + if (CustomAttrs.Length != 0) + { + defaultValue = ((CustomConstantAttribute)CustomAttrs[0]).Value; + } + else + { + CustomAttrs = GetCustomAttributes(s_DecimalConstantAttributeType, false); + if (CustomAttrs.Length != 0) + { + defaultValue = ((DecimalConstantAttribute)CustomAttrs[0]).Value; + } + } + } + #endregion + } + + if (defaultValue == DBNull.Value) + m_noDefaultValue = true; + + return defaultValue; + } + + internal RuntimeModule GetRuntimeModule() + { + RuntimeMethodInfo method = Member as RuntimeMethodInfo; + RuntimeConstructorInfo constructor = Member as RuntimeConstructorInfo; + RuntimePropertyInfo property = Member as RuntimePropertyInfo; + + if (method != null) + return method.GetRuntimeModule(); + else if (constructor != null) + return constructor.GetRuntimeModule(); + else if (property != null) + return property.GetRuntimeModule(); + else + return null; + } + + public override int MetadataToken + { + get + { + return m_tkParamDef; + } + } + + public override Type[] GetRequiredCustomModifiers() + { + return m_signature.GetCustomModifiers(PositionImpl + 1, true); + } + + public override Type[] GetOptionalCustomModifiers() + { + return m_signature.GetCustomModifiers(PositionImpl + 1, false); + } + + #endregion + + #region ICustomAttributeProvider + public override Object[] GetCustomAttributes(bool inherit) + { + if (MdToken.IsNullToken(m_tkParamDef)) + return Array.Empty<Object>(); + + return CustomAttribute.GetCustomAttributes(this, typeof(object) as RuntimeType); + } + + public override Object[] GetCustomAttributes(Type attributeType, bool inherit) + { + if (attributeType == null) + throw new ArgumentNullException(nameof(attributeType)); + Contract.EndContractBlock(); + + if (MdToken.IsNullToken(m_tkParamDef)) + return Array.Empty<Object>(); + + RuntimeType attributeRuntimeType = attributeType.UnderlyingSystemType as RuntimeType; + + if (attributeRuntimeType == null) + throw new ArgumentException(SR.Arg_MustBeType, nameof(attributeType)); + + return CustomAttribute.GetCustomAttributes(this, attributeRuntimeType); + } + + public override bool IsDefined(Type attributeType, bool inherit) + { + if (attributeType == null) + throw new ArgumentNullException(nameof(attributeType)); + Contract.EndContractBlock(); + + if (MdToken.IsNullToken(m_tkParamDef)) + return false; + + RuntimeType attributeRuntimeType = attributeType.UnderlyingSystemType as RuntimeType; + + if (attributeRuntimeType == null) + throw new ArgumentException(SR.Arg_MustBeType, nameof(attributeType)); + + return CustomAttribute.IsDefined(this, attributeRuntimeType); + } + + public override IList<CustomAttributeData> GetCustomAttributesData() + { + return CustomAttributeData.GetCustomAttributesInternal(this); + } + #endregion + } +} |