.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
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// Copyright (c) 2019 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 System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata;
using System.Xml.Linq;
using ICSharpCode.Decompiler.CSharp;
using ICSharpCode.Decompiler.IL;
using ICSharpCode.Decompiler.IL.Transforms;
using ICSharpCode.Decompiler.Util;
using ILSpy.BamlDecompiler.Xaml;
namespace ILSpy.BamlDecompiler.Rewrite
{
using ICSharpCode.Decompiler.TypeSystem;
internal class ConnectionIdRewritePass : IRewritePass
{
static readonly TopLevelTypeName componentConnectorTypeName
= new TopLevelTypeName("System.Windows.Markup", "IComponentConnector");
static readonly TopLevelTypeName styleConnectorTypeName
= new TopLevelTypeName("System.Windows.Markup", "IStyleConnector");
public void Run(XamlContext ctx, XDocument document)
{
var connections = DecompileConnections(ctx, document);
ProcessConnectionIds(ctx, document.Root, connections);
}
static void ProcessConnectionIds(XamlContext ctx, XElement element,
(List<(LongSet key, FieldAssignment value)> fieldAssignments,
List<(LongSet key, EventRegistration[] value)> eventMappings) connections)
{
foreach (var child in element.Elements())
ProcessConnectionIds(ctx, child, connections);
var fieldAssignments = connections.fieldAssignments;
var eventMappings = connections.eventMappings;
foreach (var annotation in element.Annotations<BamlConnectionId>())
{
int index;
bool found = false;
if ((index = fieldAssignments.FindIndex(item => item.key.Contains(annotation.Id))) > -1)
{
var xName = ctx.GetKnownNamespace("Name", XamlContext.KnownNamespace_Xaml, element);
FieldAssignment fieldAssignment = fieldAssignments[index].value;
if (element.Attribute("Name") is null && element.Attribute(xName) is null)
{
element.Add(new XAttribute(xName, fieldAssignment.Field.Name));
}
ctx.GeneratedMembers.Add(fieldAssignment.Field.MetadataToken);
found = true;
}
if ((index = eventMappings.FindIndex(item => item.key.Contains(annotation.Id))) > -1)
{
foreach (var entry in eventMappings[index].value)
{
string xmlns = ""; // TODO : implement xmlns resolver!
var type = element.Annotation<XamlType>();
if (type?.TypeNamespace + "." + type?.TypeName == "System.Windows.Style")
{
element.Add(new XElement(type.Namespace + "EventSetter",
new XAttribute("Event", entry.EventName),
new XAttribute("Handler", entry.MethodName)));
}
else
{
element.Add(new XAttribute(xmlns + entry.EventName, entry.MethodName));
}
}
found = true;
}
if (!found)
{
element.Add(new XComment($"Unknown connection ID: {annotation.Id}"));
}
}
}
(List<(LongSet, FieldAssignment)>, List<(LongSet, EventRegistration[])>) DecompileConnections
(XamlContext ctx, XDocument document)
{
var fieldAssignments = new List<(LongSet key, FieldAssignment value)>();
var eventMappings = new List<(LongSet, EventRegistration[])>();
var xClass = document.Root
.Elements().First()
.Attribute(ctx.GetKnownNamespace("Class", XamlContext.KnownNamespace_Xaml));
if (xClass == null)
return (fieldAssignments, eventMappings);
var type = ctx.TypeSystem.FindType(new FullTypeName(xClass.Value)).GetDefinition();
if (type == null)
return (fieldAssignments, eventMappings);
DecompileConnections(ctx, fieldAssignments, eventMappings, componentConnectorTypeName, type);
DecompileConnections(ctx, fieldAssignments, eventMappings, styleConnectorTypeName, type);
return (fieldAssignments, eventMappings);
}
void DecompileConnections(XamlContext ctx, List<(LongSet, FieldAssignment)> fieldAssignments,
List<(LongSet, EventRegistration[])> eventMappings, FullTypeName connectorTypeName, ITypeDefinition type)
{
var connectorInterface = ctx.TypeSystem.FindType(connectorTypeName).GetDefinition();
if (connectorInterface == null)
return;
var connect = connectorInterface.GetMethods(m => m.Name == "Connect").SingleOrDefault();
IMethod connectMethod = null;
MethodDefinition connectMetadataEntry = default;
var module = ctx.TypeSystem.MainModule.PEFile;
foreach (IMethod m in type.Methods)
{
if (connectMethod == null && m.ExplicitlyImplementedInterfaceMembers.Any(md => md.MemberDefinition.Equals(connect)))
{
connectMethod = m;
connectMetadataEntry = module.Metadata
.GetMethodDefinition((MethodDefinitionHandle)connectMethod.MetadataToken);
}
else if (m.Parameters.Count == 0
&& m.ReturnType.Kind == TypeKind.Void
&& !m.IsStatic
&& m.Accessibility == Accessibility.Public
&& m.Name == "InitializeComponent"
&& m.GetAttributes().Any(a => a.AttributeType.ReflectionName == "System.CodeDom.Compiler.GeneratedCodeAttribute"))
{
ctx.GeneratedMembers.Add(m.MetadataToken);
}
else if (m.Parameters.Count == 0
&& m.ReturnType.Kind == TypeKind.Void
&& m.IsStatic
&& m.Accessibility == Accessibility.Public
&& m.Name == "Main"
&& m.DeclaringTypeDefinition.GetNonInterfaceBaseTypes().Any(t => t.ReflectionName == "System.Windows.Application")
&& m.GetAttributes().Any(a => a.AttributeType.ReflectionName == "System.CodeDom.Compiler.GeneratedCodeAttribute"))
{
ctx.GeneratedMembers.Add(m.MetadataToken);
}
}
if (type.Fields.FirstOrDefault(f => f.Name == "_contentLoaded" && f.Type.IsKnownType(KnownTypeCode.Boolean)) is {
Accessibility: Accessibility.Private, IsStatic: false
} contentLoadedField)
{
ctx.GeneratedMembers.Add(contentLoadedField.MetadataToken);
}
if (connectMethod == null || connectMetadataEntry.RelativeVirtualAddress <= 0)
return;
ctx.GeneratedMembers.Add(connectMethod.MetadataToken);
var body = module.Reader.GetMethodBody(connectMetadataEntry.RelativeVirtualAddress);
var genericContext = new GenericContext(
classTypeParameters: connectMethod.DeclaringType?.TypeParameters,
methodTypeParameters: connectMethod.TypeParameters);
// decompile method and optimize the switch
var ilReader = new ILReader(ctx.TypeSystem.MainModule);
var function = ilReader.ReadIL((MethodDefinitionHandle)connectMethod.MetadataToken, body, genericContext,
ILFunctionKind.TopLevelFunction, ctx.CancellationToken);
var context = new ILTransformContext(function, ctx.TypeSystem, null) {
CancellationToken = ctx.CancellationToken
};
function.RunTransforms(CSharpDecompiler.GetILTransforms(), context);
var block = function.Body.Children.OfType<Block>().First();
var ilSwitch = block.Descendants.OfType<SwitchInstruction>().FirstOrDefault();
var events = new List<EventRegistration>();
if (ilSwitch != null)
{
foreach (var section in ilSwitch.Sections)
{
Add(section.Labels, section.Body);
}
}
else
{
foreach (var ifInst in function.Descendants.OfType<IfInstruction>())
{
if (!(ifInst.Condition is Comp comp))
continue;
if (comp.Kind != ComparisonKind.Inequality && comp.Kind != ComparisonKind.Equality)
continue;
if (!comp.Right.MatchLdcI4(out int id))
continue;
var inst = comp.Kind == ComparisonKind.Inequality
? ifInst.FalseInst
: ifInst.TrueInst;
Add(new LongSet(id), inst);
}
}
void Add(LongSet ids, ILInstruction inst)
{
var field = FindField(inst);
if (!(field is null))
{
fieldAssignments.Add((ids, field));
}
events.Clear();
FindEvents(inst, events);
if (events.Count > 0)
{
eventMappings.Add((ids, events.ToArray()));
}
}
}
FieldAssignment FindField(ILInstruction inst)
{
switch (inst)
{
case Block b:
var t = b.Instructions.FirstOrDefault();
if (!(t is null) && MatchFieldAssignment(t, out var field))
return field;
return null;
case Branch br:
return FindField(br.TargetBlock);
default:
if (MatchFieldAssignment(inst, out field))
return field;
return null;
}
}
bool MatchFieldAssignment(ILInstruction inst, out FieldAssignment field)
{
field = null;
if (!inst.MatchStFld(out _, out var fld, out var value) || !value.MatchCastClass(out var arg, out _)
|| !(arg.MatchLdLoc(out var t) && t.Kind == VariableKind.Parameter && t.Index == 1))
return false;
field = new FieldAssignment { Field = fld };
return true;
}
void FindEvents(ILInstruction inst, List<EventRegistration> events)
{
EventRegistration @event;
switch (inst)
{
case Block b:
for (int i = 0; i < b.Instructions.Count;)
{
if (MatchEventSetterCreation(b, ref i, out @event))
events.Add(@event);
else
i++;
}
foreach (var node in b.Instructions)
{
if (MatchSimpleEventRegistration(node, out @event))
events.Add(@event);
}
break;
case Branch br:
FindEvents(br.TargetBlock, events);
break;
default:
if (MatchSimpleEventRegistration(inst, out @event))
events.Add(@event);
break;
}
}
// stloc v(newobj EventSetter..ctor())
// callvirt set_Event(ldloc v, ldsfld eventName)
// callvirt set_Handler(ldloc v, newobj RoutedEventHandler..ctor(ldloc this, ldftn eventHandler))
// callvirt Add(callvirt get_Setters(castclass System.Windows.Style(ldloc target)), ldloc v)
bool MatchEventSetterCreation(Block b, ref int pos, out EventRegistration @event)
{
@event = null;
if (!b.FinalInstruction.MatchNop())
{
pos = b.Instructions.Count;
return false;
}
var instr = b.Instructions;
// stloc v(newobj EventSetter..ctor())
if (!instr[pos + 0].MatchStLoc(out var v, out var initializer))
return false;
if (!(initializer is NewObj newObj
&& newObj.Method.DeclaringType.FullName == "System.Windows.EventSetter"
&& newObj.Arguments.Count == 0))
{
return false;
}
//callvirt set_Event(ldloc v, ldsfld eventName)
if (!(instr[pos + 1] is CallVirt setEventCall && setEventCall.Arguments.Count == 2))
return false;
if (!setEventCall.Method.IsAccessor)
return false;
if (!setEventCall.Arguments[0].MatchLdLoc(v))
return false;
if (setEventCall.Method.Name != "set_Event")
return false;
if (!setEventCall.Arguments[1].MatchLdsFld(out var eventField))
return false;
string eventName = eventField.Name;
if (eventName.EndsWith("Event"))
{
eventName = eventName.Remove(eventName.Length - "Event".Length);
}
// callvirt set_Handler(ldloc v, newobj RoutedEventHandler..ctor(ldloc this, ldftn eventHandler))
if (!(instr[pos + 2] is CallVirt setHandlerCall && setHandlerCall.Arguments.Count == 2))
return false;
if (!setHandlerCall.Method.IsAccessor)
return false;
if (!setHandlerCall.Arguments[0].MatchLdLoc(v))
return false;
if (setHandlerCall.Method.Name != "set_Handler")
return false;
if (!MatchEventHandlerCreation(setHandlerCall.Arguments[1], out string handlerName))
return false;
@event = new EventRegistration { EventName = eventName, MethodName = handlerName };
// callvirt Add(callvirt get_Setters(castclass System.Windows.Style(ldloc target)), ldloc v)
if (!(instr[pos + 3] is CallVirt addCall && addCall.Arguments.Count == 2))
return false;
if (addCall.Method.Name != "Add")
return false;
if (!(addCall.Arguments[0] is CallVirt getSettersCall && getSettersCall.Arguments.Count == 1))
return false;
if (!getSettersCall.Method.IsAccessor)
return false;
if (getSettersCall.Method.Name != "get_Setters")
return false;
if (!getSettersCall.Arguments[0].MatchCastClass(out var arg, out var type))
return false;
if (type.FullName != "System.Windows.Style")
return false;
if (!(arg.MatchLdLoc(out var t) && t.Kind == VariableKind.Parameter && t.Index == 1))
return false;
if (!addCall.Arguments[1].MatchLdLoc(v))
return false;
pos += 4;
return true;
}
bool MatchSimpleEventRegistration(ILInstruction inst, out EventRegistration @event)
{
@event = null;
if (!(inst is CallInstruction call) || call.OpCode == OpCode.NewObj)
return false;
if (!IsAddEvent(call, out string eventName, out string handlerName)
&& !IsAddAttachedEvent(call, out eventName, out handlerName))
{
return false;
}
@event = new EventRegistration { EventName = eventName, MethodName = handlerName };
return true;
}
bool IsAddAttachedEvent(CallInstruction call, out string eventName, out string handlerName)
{
eventName = "";
handlerName = "";
if (call.Arguments.Count == 3)
{
var addMethod = call.Method;
if (addMethod.Name != "AddHandler" || addMethod.Parameters.Count != 2)
return false;
if (!call.Arguments[1].MatchLdsFld(out IField field))
return false;
eventName = field.DeclaringType.Name + "." + field.Name;
if (eventName.EndsWith("Event", StringComparison.Ordinal)
&& eventName.Length > "Event".Length)
{
eventName = eventName.Remove(eventName.Length - "Event".Length);
}
return MatchEventHandlerCreation(call.Arguments[2], out handlerName);
}
return false;
}
bool IsAddEvent(CallInstruction call, out string eventName, out string handlerName)
{
eventName = "";
handlerName = "";
if (call.Arguments.Count == 2)
{
var addMethod = call.Method;
if (!addMethod.Name.StartsWith("add_", StringComparison.Ordinal)
|| addMethod.Parameters.Count != 1)
{
return false;
}
eventName = addMethod.Name.Substring("add_".Length);
return MatchEventHandlerCreation(call.Arguments[1], out handlerName);
}
return false;
}
bool MatchEventHandlerCreation(ILInstruction inst, out string handlerName)
{
handlerName = "";
if (!(inst is NewObj newObj) || newObj.Arguments.Count != 2)
return false;
var ldftn = newObj.Arguments[1];
if (ldftn.OpCode != OpCode.LdFtn && ldftn.OpCode != OpCode.LdVirtFtn)
return false;
handlerName = ((IInstructionWithMethodOperand)ldftn).Method.Name;
handlerName = XamlUtils.EscapeName(handlerName);
return true;
}
}
}