Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil/MetadataResolver.cs

@@ -0,0 +1,388 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+
+using Mono.Collections.Generic;
+
+namespace Mono.Cecil {
+
+	public interface IAssemblyResolver : IDisposable {
+		AssemblyDefinition Resolve (AssemblyNameReference name);
+		AssemblyDefinition Resolve (AssemblyNameReference name, ReaderParameters parameters);
+
+		AssemblyDefinition Resolve (string fullName);
+		AssemblyDefinition Resolve (string fullName, ReaderParameters parameters);
+	}
+
+	public interface IMetadataResolver {
+		TypeDefinition Resolve (TypeReference type);
+		FieldDefinition Resolve (FieldReference field);
+		MethodDefinition Resolve (MethodReference method);
+	}
+
+#if !PCL && !NET_CORE
+	[Serializable]
+#endif
+	public sealed class ResolutionException : Exception {
+
+		readonly MemberReference member;
+
+		public MemberReference Member {
+			get { return member; }
+		}
+
+		public IMetadataScope Scope {
+			get {
+				var type = member as TypeReference;
+				if (type != null)
+					return type.Scope;
+
+				var declaring_type = member.DeclaringType;
+				if (declaring_type != null)
+					return declaring_type.Scope;
+
+				throw new NotSupportedException ();
+			}
+		}
+
+		public ResolutionException (MemberReference member)
+			: base ("Failed to resolve " + member.FullName)
+		{
+			if (member == null)
+				throw new ArgumentNullException ("member");
+
+			this.member = member;
+		}
+
+#if !PCL && !NET_CORE
+		ResolutionException (
+			System.Runtime.Serialization.SerializationInfo info,
+			System.Runtime.Serialization.StreamingContext context)
+			: base (info, context)
+		{
+		}
+#endif
+	}
+
+	public class MetadataResolver : IMetadataResolver {
+
+		readonly IAssemblyResolver assembly_resolver;
+
+		public IAssemblyResolver AssemblyResolver {
+			get { return assembly_resolver; }
+		}
+
+		public MetadataResolver (IAssemblyResolver assemblyResolver)
+		{
+			if (assemblyResolver == null)
+				throw new ArgumentNullException ("assemblyResolver");
+
+			assembly_resolver = assemblyResolver;
+		}
+
+		public virtual TypeDefinition Resolve (TypeReference type)
+		{
+			if (type == null)
+				throw new ArgumentNullException ("type");
+
+			type = type.GetElementType ();
+
+			var scope = type.Scope;
+
+			if (scope == null)
+				return null;
+
+			switch (scope.MetadataScopeType) {
+			case MetadataScopeType.AssemblyNameReference:
+				var assembly = assembly_resolver.Resolve ((AssemblyNameReference) scope);
+				if (assembly == null)
+					return null;
+
+				return GetType (assembly.MainModule, type);
+			case MetadataScopeType.ModuleDefinition:
+				return GetType ((ModuleDefinition) scope, type);
+			case MetadataScopeType.ModuleReference:
+				var modules = type.Module.Assembly.Modules;
+				var module_ref = (ModuleReference) scope;
+				for (int i = 0; i < modules.Count; i++) {
+					var netmodule = modules [i];
+					if (netmodule.Name == module_ref.Name)
+						return GetType (netmodule, type);
+				}
+				break;
+			}
+
+			throw new NotSupportedException ();
+		}
+
+		static TypeDefinition GetType (ModuleDefinition module, TypeReference reference)
+		{
+			var type = GetTypeDefinition (module, reference);
+			if (type != null)
+				return type;
+
+			if (!module.HasExportedTypes)
+				return null;
+
+			var exported_types = module.ExportedTypes;
+
+			for (int i = 0; i < exported_types.Count; i++) {
+				var exported_type = exported_types [i];
+				if (exported_type.Name != reference.Name)
+					continue;
+
+				if (exported_type.Namespace != reference.Namespace)
+					continue;
+
+				return exported_type.Resolve ();
+			}
+
+			return null;
+		}
+
+		static TypeDefinition GetTypeDefinition (ModuleDefinition module, TypeReference type)
+		{
+			if (!type.IsNested)
+				return module.GetType (type.Namespace, type.Name);
+
+			var declaring_type = type.DeclaringType.Resolve ();
+			if (declaring_type == null)
+				return null;
+
+			return declaring_type.GetNestedType (type.TypeFullName ());
+		}
+
+		public virtual FieldDefinition Resolve (FieldReference field)
+		{
+			if (field == null)
+				throw new ArgumentNullException ("field");
+
+			var type = Resolve (field.DeclaringType);
+			if (type == null)
+				return null;
+
+			if (!type.HasFields)
+				return null;
+
+			return GetField (type, field);
+		}
+
+		FieldDefinition GetField (TypeDefinition type, FieldReference reference)
+		{
+			while (type != null) {
+				var field = GetField (type.Fields, reference);
+				if (field != null)
+					return field;
+
+				if (type.BaseType == null)
+					return null;
+
+				type = Resolve (type.BaseType);
+			}
+
+			return null;
+		}
+
+		static FieldDefinition GetField (Collection<FieldDefinition> fields, FieldReference reference)
+		{
+			for (int i = 0; i < fields.Count; i++) {
+				var field = fields [i];
+
+				if (field.Name != reference.Name)
+					continue;
+
+				if (!AreSame (field.FieldType, reference.FieldType))
+					continue;
+
+				return field;
+			}
+
+			return null;
+		}
+
+		public virtual MethodDefinition Resolve (MethodReference method)
+		{
+			if (method == null)
+				throw new ArgumentNullException ("method");
+
+			var type = Resolve (method.DeclaringType);
+			if (type == null)
+				return null;
+
+			method = method.GetElementMethod ();
+
+			if (!type.HasMethods)
+				return null;
+
+			return GetMethod (type, method);
+		}
+
+		MethodDefinition GetMethod (TypeDefinition type, MethodReference reference)
+		{
+			while (type != null) {
+				var method = GetMethod (type.Methods, reference);
+				if (method != null)
+					return method;
+
+				if (type.BaseType == null)
+					return null;
+
+				type = Resolve (type.BaseType);
+			}
+
+			return null;
+		}
+
+		public static MethodDefinition GetMethod (Collection<MethodDefinition> methods, MethodReference reference)
+		{
+			for (int i = 0; i < methods.Count; i++) {
+				var method = methods [i];
+
+				if (method.Name != reference.Name)
+					continue;
+
+				if (method.HasGenericParameters != reference.HasGenericParameters)
+					continue;
+
+				if (method.HasGenericParameters && method.GenericParameters.Count != reference.GenericParameters.Count)
+					continue;
+
+				if (!AreSame (method.ReturnType, reference.ReturnType))
+					continue;
+
+				if (method.IsVarArg () != reference.IsVarArg ())
+					continue;
+
+				if (method.IsVarArg () && IsVarArgCallTo (method, reference))
+					return method;
+
+				if (method.HasParameters != reference.HasParameters)
+					continue;
+
+				if (!method.HasParameters && !reference.HasParameters)
+					return method;
+
+				if (!AreSame (method.Parameters, reference.Parameters))
+					continue;
+
+				return method;
+			}
+
+			return null;
+		}
+
+		static bool AreSame (Collection<ParameterDefinition> a, Collection<ParameterDefinition> b)
+		{
+			var count = a.Count;
+
+			if (count != b.Count)
+				return false;
+
+			if (count == 0)
+				return true;
+
+			for (int i = 0; i < count; i++)
+				if (!AreSame (a [i].ParameterType, b [i].ParameterType))
+					return false;
+
+			return true;
+		}
+
+		static bool IsVarArgCallTo (MethodDefinition method, MethodReference reference)
+		{
+			if (method.Parameters.Count >= reference.Parameters.Count)
+				return false;
+
+			if (reference.GetSentinelPosition () != method.Parameters.Count)
+				return false;
+
+			for (int i = 0; i < method.Parameters.Count; i++)
+				if (!AreSame (method.Parameters [i].ParameterType, reference.Parameters [i].ParameterType))
+					return false;
+
+			return true;
+		}
+
+		static bool AreSame (TypeSpecification a, TypeSpecification b)
+		{
+			if (!AreSame (a.ElementType, b.ElementType))
+				return false;
+
+			if (a.IsGenericInstance)
+				return AreSame ((GenericInstanceType) a, (GenericInstanceType) b);
+
+			if (a.IsRequiredModifier || a.IsOptionalModifier)
+				return AreSame ((IModifierType) a, (IModifierType) b);
+
+			if (a.IsArray)
+				return AreSame ((ArrayType) a, (ArrayType) b);
+
+			return true;
+		}
+
+		static bool AreSame (ArrayType a, ArrayType b)
+		{
+			if (a.Rank != b.Rank)
+				return false;
+
+			// TODO: dimensions
+
+			return true;
+		}
+
+		static bool AreSame (IModifierType a, IModifierType b)
+		{
+			return AreSame (a.ModifierType, b.ModifierType);
+		}
+
+		static bool AreSame (GenericInstanceType a, GenericInstanceType b)
+		{
+			if (a.GenericArguments.Count != b.GenericArguments.Count)
+				return false;
+
+			for (int i = 0; i < a.GenericArguments.Count; i++)
+				if (!AreSame (a.GenericArguments [i], b.GenericArguments [i]))
+					return false;
+
+			return true;
+		}
+
+		static bool AreSame (GenericParameter a, GenericParameter b)
+		{
+			return a.Position == b.Position;
+		}
+
+		static bool AreSame (TypeReference a, TypeReference b)
+		{
+			if (ReferenceEquals (a, b))
+				return true;
+
+			if (a == null || b == null)
+				return false;
+
+			if (a.etype != b.etype)
+				return false;
+
+			if (a.IsGenericParameter)
+				return AreSame ((GenericParameter) a, (GenericParameter) b);
+
+			if (a.IsTypeSpecification ())
+				return AreSame ((TypeSpecification) a, (TypeSpecification) b);
+
+			if (a.Name != b.Name || a.Namespace != b.Namespace)
+				return false;
+
+			//TODO: check scope
+
+			return AreSame (a.DeclaringType, b.DeclaringType);
+		}
+	}
+}