2012-01-08 03:27:07 +08:00
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/*
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2012-01-10 06:04:52 +08:00
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Copyright (C) 2011-2012 de4dot@gmail.com
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2012-01-08 03:27:07 +08:00
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This file is part of de4dot.
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de4dot is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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de4dot is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using Mono.Cecil;
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using de4dot.blocks;
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namespace de4dot.code.deobfuscators.Babel_NET {
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class TypeReferenceConverter : TypeReferenceUpdaterBase {
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MemberReferenceConverter memberReferenceConverter;
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ModuleDefinition Module {
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get { return memberReferenceConverter.Module; }
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}
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public TypeReferenceConverter(MemberReferenceConverter memberReferenceConverter) {
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this.memberReferenceConverter = memberReferenceConverter;
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}
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public TypeReference convert(TypeReference a) {
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var newOne = update(a);
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if (!(a is GenericParameter) && !MemberReferenceHelper.compareTypes(newOne, a))
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throw new ApplicationException("Could not convert type reference");
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return newOne;
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}
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protected override TypeReference updateTypeReference(TypeReference a) {
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if (a.Module == Module)
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return a;
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var newTypeRef = new TypeReference(a.Namespace, a.Name, Module, memberReferenceConverter.convert(a.Scope), a.IsValueType);
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foreach (var gp in a.GenericParameters)
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newTypeRef.GenericParameters.Add(new GenericParameter(gp.Name, newTypeRef));
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newTypeRef.DeclaringType = update(a.DeclaringType);
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newTypeRef.UpdateElementType();
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return newTypeRef;
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}
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}
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// Converts type references/definitions in one module to this module
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class MemberReferenceConverter {
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ModuleDefinition module;
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public ModuleDefinition Module {
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get { return module; }
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}
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public MemberReferenceConverter(ModuleDefinition module) {
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this.module = module;
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}
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bool isInOurModule(MemberReference memberRef) {
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return memberRef.Module == module;
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}
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public TypeReference convert(TypeReference typeRef) {
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if (typeRef == null)
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return null;
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typeRef = new TypeReferenceConverter(this).convert(typeRef);
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return tryGetTypeDefinition(typeRef);
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}
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public FieldReference convert(FieldReference fieldRef) {
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if (isInOurModule(fieldRef))
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return tryGetFieldDefinition(fieldRef);
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return new FieldReference(fieldRef.Name, convert(fieldRef.FieldType), convert(fieldRef.DeclaringType));
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}
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public MethodReference convert(MethodReference methodRef) {
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if (methodRef.GetType() != typeof(MethodReference) && methodRef.GetType() != typeof(MethodDefinition))
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throw new ApplicationException("Invalid method reference type");
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if (isInOurModule(methodRef))
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return tryGetMethodDefinition(methodRef);
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return copy(methodRef);
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}
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public MethodReference copy(MethodReference methodRef) {
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if (methodRef.GetType() != typeof(MethodReference) && methodRef.GetType() != typeof(MethodDefinition))
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throw new ApplicationException("Invalid method reference type");
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var newMethodRef = new MethodReference(methodRef.Name, convert(methodRef.MethodReturnType.ReturnType), convert(methodRef.DeclaringType));
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newMethodRef.HasThis = methodRef.HasThis;
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newMethodRef.ExplicitThis = methodRef.ExplicitThis;
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newMethodRef.CallingConvention = methodRef.CallingConvention;
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foreach (var param in methodRef.Parameters)
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newMethodRef.Parameters.Add(new ParameterDefinition(param.Name, param.Attributes, convert(param.ParameterType)));
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foreach (var gp in methodRef.GenericParameters)
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newMethodRef.GenericParameters.Add(new GenericParameter(gp.Name, newMethodRef));
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return newMethodRef;
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}
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public IMetadataScope convert(IMetadataScope scope) {
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switch (scope.MetadataScopeType) {
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case MetadataScopeType.AssemblyNameReference:
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return convert((AssemblyNameReference)scope);
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case MetadataScopeType.ModuleDefinition:
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var mod = (ModuleDefinition)scope;
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if (mod.Assembly != null)
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return convert((AssemblyNameReference)mod.Assembly.Name);
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return convert((ModuleReference)scope);
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case MetadataScopeType.ModuleReference:
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return convert((ModuleReference)scope);
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default:
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throw new ApplicationException("Unknown MetadataScopeType");
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}
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}
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public AssemblyNameReference convert(AssemblyNameReference asmRef) {
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foreach (var modAsmRef in module.AssemblyReferences) {
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if (modAsmRef.FullName == asmRef.FullName)
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return modAsmRef;
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}
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var newAsmRef = AssemblyNameReference.Parse(asmRef.FullName);
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module.AssemblyReferences.Add(newAsmRef);
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return newAsmRef;
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}
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public ModuleReference convert(ModuleReference modRef) {
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foreach (var modModRef in module.ModuleReferences) {
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if (modModRef.Name == modRef.Name)
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return modModRef;
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}
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var newModRef = new ModuleReference(modRef.Name);
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module.ModuleReferences.Add(newModRef);
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return newModRef;
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}
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public TypeReference tryGetTypeDefinition(TypeReference typeRef) {
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return DotNetUtils.getType(module, typeRef) ?? typeRef;
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}
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public FieldReference tryGetFieldDefinition(FieldReference fieldRef) {
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var fieldDef = fieldRef as FieldDefinition;
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if (fieldDef != null)
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return fieldDef;
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var declaringType = DotNetUtils.getType(module, fieldRef.DeclaringType);
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if (declaringType == null)
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return fieldRef;
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foreach (var field in declaringType.Fields) {
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if (MemberReferenceHelper.compareFieldReference(field, fieldRef))
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return field;
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}
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return fieldRef;
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}
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public MethodReference tryGetMethodDefinition(MethodReference methodRef) {
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var methodDef = methodRef as MethodDefinition;
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if (methodDef != null)
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return methodDef;
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var declaringType = DotNetUtils.getType(module, methodRef.DeclaringType);
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if (declaringType == null)
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return methodRef;
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foreach (var method in declaringType.Methods) {
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if (MemberReferenceHelper.compareMethodReference(method, methodRef))
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return method;
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}
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return methodRef;
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}
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}
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}
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