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DebugXamlCTask.cs
157 lines (141 loc) · 6.45 KB
/
DebugXamlCTask.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Cecil.Rocks;
using static Microsoft.Build.Framework.MessageImportance;
namespace Xamarin.Forms.Build.Tasks
{
public class DebugXamlCTask : XamlTask
{
public override bool Execute(out IList<Exception> thrownExceptions)
{
thrownExceptions = null;
LoggingHelper.LogMessage(Normal, $"{new string(' ', 0)}Preparing debug code for xamlc, assembly: {Assembly}");
var resolver = new DefaultAssemblyResolver();
if (!string.IsNullOrEmpty(DependencyPaths)) {
foreach (var dep in DependencyPaths.Split(';')) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 2)}Adding searchpath {dep}");
resolver.AddSearchDirectory(dep);
}
}
if (!string.IsNullOrEmpty(ReferencePath)) {
var paths = ReferencePath.Replace("//", "/").Split(';');
foreach (var p in paths) {
var searchpath = Path.GetDirectoryName(p);
LoggingHelper.LogMessage(Low, $"{new string(' ', 2)}Adding searchpath {searchpath}");
resolver.AddSearchDirectory(searchpath);
}
}
var debug = DebugSymbols || (!string.IsNullOrEmpty(DebugType) && DebugType.ToLowerInvariant() != "none");
using (var assemblyDefinition = AssemblyDefinition.ReadAssembly(Assembly, new ReaderParameters {
ReadWrite = true,
ReadSymbols = debug,
AssemblyResolver = resolver
})) {
foreach (var module in assemblyDefinition.Modules) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 2)}Module: {module.Name}");
foreach (var resource in module.Resources.OfType<EmbeddedResource>()) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 4)}Resource: {resource.Name}");
if (!resource.IsXaml(module, out var classname)) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}skipped.");
continue;
}
TypeDefinition typeDef = module.GetType(classname);
if (typeDef == null) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}no type found... skipped.");
continue;
}
var initComp = typeDef.Methods.FirstOrDefault(md => md.Name == "InitializeComponent");
if (initComp == null) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}no InitializeComponent found... skipped.");
continue;
}
var initCompRuntime = typeDef.Methods.FirstOrDefault(md => md.Name == "__InitComponentRuntime");
if (initCompRuntime == null) {
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}Creating empty {typeDef.Name}.__InitComponentRuntime");
initCompRuntime = new MethodDefinition("__InitComponentRuntime", initComp.Attributes, initComp.ReturnType);
initCompRuntime.Body.InitLocals = true;
LoggingHelper.LogMessage(Low, $"{new string(' ', 8)}done.");
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}Copying body of InitializeComponent to __InitComponentRuntime");
initCompRuntime.Body = new MethodBody(initCompRuntime);
var iCRIl = initCompRuntime.Body.GetILProcessor();
foreach (var instr in initComp.Body.Instructions)
iCRIl.Append(instr);
initComp.Body.Instructions.Clear();
initComp.Body.GetILProcessor().Emit(OpCodes.Ret);
typeDef.Methods.Add(initCompRuntime);
LoggingHelper.LogMessage(Low, $"{new string(' ', 8)}done.");
}
// IL_0000: ldarg.0
// IL_0001: callvirt instance void class [Xamarin.Forms.Core]Xamarin.Forms.ContentPage::'.ctor'()
//
// IL_0006: nop
// IL_0007: ldarg.1
// IL_0008: brfalse IL_0018
//
// IL_000d: ldarg.0
// IL_000e: callvirt instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::InitializeComponent()
// IL_0013: br IL_001e
//
// IL_0018: ldarg.0
// IL_0019: callvirt instance void class Xamarin.Forms.Xaml.XamlcTests.MyPage::__InitComponentRuntime()
// IL_001e: ret
var altCtor = typeDef.Methods.FirstOrDefault(md => md.IsConstructor
&& md.Parameters.Count == 1
&& md.Parameters[0].ParameterType == module.TypeSystem.Boolean);
if (altCtor != null)
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}Replacing body of {typeDef.Name}.{typeDef.Name} (bool {altCtor.Parameters[0].Name})");
else {
LoggingHelper.LogMessage(Low, $"{new string(' ', 6)}Adding {typeDef.Name}.{typeDef.Name} (bool useCompiledXaml)");
altCtor = new MethodDefinition(".ctor",
MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName |
MethodAttributes.RTSpecialName, module.TypeSystem.Void);
altCtor.Parameters.Add(new ParameterDefinition("useCompiledXaml", ParameterAttributes.None,
module.TypeSystem.Boolean));
}
var body = new MethodBody(altCtor) {
InitLocals = true
};
var il = body.GetILProcessor();
var br2 = Instruction.Create(OpCodes.Ldarg_0);
var ret = Instruction.Create(OpCodes.Ret);
il.Emit(OpCodes.Ldarg_0);
MethodReference baseCtor;
if (typeDef.BaseType.Resolve().GetConstructors().FirstOrDefault(c => c.HasParameters && c.Parameters.Count == 1 && c.Parameters[0].Name == "useCompiledXaml") is MethodDefinition baseCtorDef) {
baseCtor = module.ImportReference(baseCtorDef);
baseCtor = module.ImportReference(baseCtor.ResolveGenericParameters(typeDef.BaseType, module));
il.Emit(OpCodes.Ldarg_1);
}
else {
baseCtor = module.ImportReference(typeDef.BaseType.Resolve().GetConstructors().First(c => c.HasParameters == false));
baseCtor = module.ImportReference(baseCtor.ResolveGenericParameters(typeDef.BaseType, module));
}
il.Emit(OpCodes.Callvirt, baseCtor);
il.Emit(OpCodes.Nop);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Brfalse, br2);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Callvirt, initComp);
il.Emit(OpCodes.Br, ret);
il.Append(br2);
il.Emit(OpCodes.Callvirt, initCompRuntime);
il.Append(ret);
altCtor.Body = body;
if (!typeDef.Methods.Contains(altCtor))
typeDef.Methods.Add(altCtor);
LoggingHelper.LogMessage(Low, $"{new string(' ', 8)}done.");
}
}
LoggingHelper.LogMessage(Normal, $"{new string(' ', 0)}Writing the assembly.");
assemblyDefinition.Write(new WriterParameters {
WriteSymbols = debug
});
}
LoggingHelper.LogMessage(Normal, $"{new string(' ', 2)}done.");
return true;
}
}
}