using System; using System.Collections.Generic; using System.IO; using System.Linq; using Mono.Cecil; using Mono.Cecil.Cil; using Mono.Cecil.Rocks; using Xamarin.Forms.Xaml; namespace Xamarin.Forms.Build.Tasks { public class XamlCTask : XamlTask { bool hasCompiledXamlResources; public bool KeepXamlResources { get; set; } public bool OptimizeIL { get; set; } bool outputGeneratedILAsCode; [Obsolete("This option is no longer available")] public bool OutputGeneratedILAsCode { get { return outputGeneratedILAsCode; } set { outputGeneratedILAsCode = value; } } internal string Type { get; set; } public override bool Execute(IList thrownExceptions) { Logger = Logger ?? new Logger(null, Verbosity); Logger.LogLine(1, "Compiling Xaml"); Logger.LogLine(1, "\nAssembly: {0}", Assembly); if (!string.IsNullOrEmpty(DependencyPaths)) Logger.LogLine(1, "DependencyPaths: \t{0}", DependencyPaths); if (!string.IsNullOrEmpty(ReferencePath)) Logger.LogLine(1, "ReferencePath: \t{0}", ReferencePath.Replace("//", "/")); Logger.LogLine(3, "DebugSymbols:\"{0}\"", DebugSymbols); var skipassembly = true; //change this to false to enable XamlC by default bool success = true; if (!File.Exists(Assembly)) { Logger.LogLine(1, "Assembly file not found. Skipping XamlC."); return true; } var resolver = new XamlCAssemblyResolver(); if (!string.IsNullOrEmpty(DependencyPaths)) { foreach (var dep in DependencyPaths.Split(';')) { Logger.LogLine(3, "Adding searchpath {0}", dep); resolver.AddSearchDirectory(dep); } } if (!string.IsNullOrEmpty(ReferencePath)) { var paths = ReferencePath.Replace("//", "/").Split(';'); foreach (var p in paths) { var searchpath = Path.GetDirectoryName(p); Logger.LogLine(3, "Adding searchpath {0}", searchpath); resolver.AddSearchDirectory(searchpath); } } var assemblyDefinition = AssemblyDefinition.ReadAssembly(Path.GetFullPath(Assembly), new ReaderParameters { AssemblyResolver = resolver, ReadSymbols = DebugSymbols }); CustomAttribute xamlcAttr; if (assemblyDefinition.HasCustomAttributes && (xamlcAttr = assemblyDefinition.CustomAttributes.FirstOrDefault( ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null) { var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value; if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip) skipassembly = true; if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile) skipassembly = false; } foreach (var module in assemblyDefinition.Modules) { var skipmodule = skipassembly; if (module.HasCustomAttributes && (xamlcAttr = module.CustomAttributes.FirstOrDefault( ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null) { var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value; if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip) skipmodule = true; if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile) skipmodule = false; } Logger.LogLine(2, " Module: {0}", module.Name); var resourcesToPrune = new List(); foreach (var resource in module.Resources.OfType()) { Logger.LogString(2, " Resource: {0}... ", resource.Name); string classname; if (!resource.IsXaml(out classname)) { Logger.LogLine(2, "skipped."); continue; } TypeDefinition typeDef = module.GetType(classname); if (typeDef == null) { Logger.LogLine(2, "no type found... skipped."); continue; } var skiptype = skipmodule; if (typeDef.HasCustomAttributes && (xamlcAttr = typeDef.CustomAttributes.FirstOrDefault( ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlCompilationAttribute")) != null) { var options = (XamlCompilationOptions)xamlcAttr.ConstructorArguments[0].Value; if ((options & XamlCompilationOptions.Skip) == XamlCompilationOptions.Skip) skiptype = true; if ((options & XamlCompilationOptions.Compile) == XamlCompilationOptions.Compile) skiptype = false; } if (Type != null) skiptype = !(Type == classname); if (skiptype) { Logger.LogLine(2, "Has XamlCompilationAttribute set to Skip and not Compile... skipped"); continue; } var initComp = typeDef.Methods.FirstOrDefault(md => md.Name == "InitializeComponent"); if (initComp == null) { Logger.LogLine(2, "no InitializeComponent found... skipped."); continue; } Logger.LogLine(2, ""); CustomAttribute xamlFilePathAttr; var xamlFilePath = typeDef.HasCustomAttributes && (xamlFilePathAttr = typeDef.CustomAttributes.FirstOrDefault(ca => ca.AttributeType.FullName == "Xamarin.Forms.Xaml.XamlFilePathAttribute")) != null ? (string)xamlFilePathAttr.ConstructorArguments [0].Value : resource.Name; var initCompRuntime = typeDef.Methods.FirstOrDefault(md => md.Name == "__InitComponentRuntime"); if (initCompRuntime != null) Logger.LogLine(2, " __InitComponentRuntime already exists... not duplicating"); else { Logger.LogString(2, " Duplicating {0}.InitializeComponent () into {0}.__InitComponentRuntime ... ", typeDef.Name); initCompRuntime = DuplicateMethodDef(typeDef, initComp, "__InitComponentRuntime"); Logger.LogLine(2, "done."); } Logger.LogString(2, " Parsing Xaml... "); var rootnode = ParseXaml(resource.GetResourceStream(), typeDef); if (rootnode == null) { Logger.LogLine(2, "failed."); continue; } Logger.LogLine(2, "done."); hasCompiledXamlResources = true; Logger.LogString(2, " Replacing {0}.InitializeComponent ()... ", typeDef.Name); Exception e; if (!TryCoreCompile(initComp, initCompRuntime, rootnode, out e)) { success = false; Logger.LogLine(2, "failed."); thrownExceptions?.Add(e); Logger.LogException(null, null, null, xamlFilePath, e); Logger.LogLine(4, e.StackTrace); continue; } Logger.LogLine(2, "done."); if (OptimizeIL) { Logger.LogString(2, " Optimizing IL... "); initComp.Body.Optimize(); Logger.LogLine(2, "done"); } if (outputGeneratedILAsCode) Logger.LogLine(2, " Decompiling option has been removed. Use a 3rd party decompiler to admire the beauty of the IL generated"); resourcesToPrune.Add(resource); } if (!KeepXamlResources) { if (resourcesToPrune.Any()) Logger.LogLine(2, " Removing compiled xaml resources"); foreach (var resource in resourcesToPrune) { Logger.LogString(2, " Removing {0}... ", resource.Name); module.Resources.Remove(resource); Logger.LogLine(2, "done"); } } Logger.LogLine(2, ""); } if (!hasCompiledXamlResources) { Logger.LogLine(1, "No compiled resources. Skipping writing assembly."); return success; } Logger.LogString(1, "Writing the assembly... "); try { assemblyDefinition.Write(Assembly, new WriterParameters { WriteSymbols = DebugSymbols }); Logger.LogLine(1, "done."); } catch (Exception e) { Logger.LogLine(1, "failed."); Logger.LogException(null, null, null, null, e); thrownExceptions?.Add(e); Logger.LogLine(4, e.StackTrace); success = false; } return success; } bool TryCoreCompile(MethodDefinition initComp, MethodDefinition initCompRuntime, ILRootNode rootnode, out Exception exception) { try { var body = new MethodBody(initComp); var il = body.GetILProcessor(); il.Emit(OpCodes.Nop); if (initCompRuntime != null) { // Generating branching code for the Previewer // IL_0007: call class [mscorlib]System.Func`2 class [Xamarin.Forms.Xaml.Internals]Xamarin.Forms.Xaml.XamlLoader::get_XamlFileProvider() // IL_000c: brfalse IL_0031 // IL_0011: call class [mscorlib]System.Func`2 class [Xamarin.Forms.Xaml.Internals]Xamarin.Forms.Xaml.XamlLoader::get_XamlFileProvider() // IL_0016: ldarg.0 // IL_0017: call instance class [mscorlib]System.Type object::GetType() // IL_001c: callvirt instance !1 class [mscorlib]System.Func`2::Invoke(!0) // IL_0021: brfalse IL_0031 // IL_0026: ldarg.0 // IL_0027: call instance void class Xamarin.Forms.Xaml.UnitTests.XamlLoaderGetXamlForTypeTests::__InitComponentRuntime() // IL_002c: ret // IL_0031: nop var nop = Instruction.Create(OpCodes.Nop); var getXamlFileProvider = body.Method.Module.Import(body.Method.Module.Import(typeof(Xamarin.Forms.Xaml.Internals.XamlLoader)) .Resolve() .Properties.FirstOrDefault(pd => pd.Name == "XamlFileProvider") .GetMethod); il.Emit(OpCodes.Call, getXamlFileProvider); il.Emit(OpCodes.Brfalse, nop); il.Emit(OpCodes.Call, getXamlFileProvider); il.Emit(OpCodes.Ldarg_0); var getType = body.Method.Module.Import(body.Method.Module.Import(typeof(object)) .Resolve() .Methods.FirstOrDefault(md => md.Name == "GetType")); il.Emit(OpCodes.Call, getType); var func = body.Method.Module.Import(body.Method.Module.Import(typeof(Func)) .Resolve() .Methods.FirstOrDefault(md => md.Name == "Invoke")); func = func.ResolveGenericParameters(body.Method.Module.Import(typeof(Func)), body.Method.Module); il.Emit(OpCodes.Callvirt, func); il.Emit(OpCodes.Brfalse, nop); il.Emit(OpCodes.Ldarg_0); il.Emit(OpCodes.Call, initCompRuntime); il.Emit(OpCodes.Ret); il.Append(nop); } var visitorContext = new ILContext(il, body, body.Method.Module); rootnode.Accept(new XamlNodeVisitor((node, parent) => node.Parent = parent), null); rootnode.Accept(new ExpandMarkupsVisitor(visitorContext), null); rootnode.Accept(new PruneIgnoredNodesVisitor(), null); rootnode.Accept(new CreateObjectVisitor(visitorContext), null); rootnode.Accept(new SetNamescopesAndRegisterNamesVisitor(visitorContext), null); rootnode.Accept(new SetFieldVisitor(visitorContext), null); rootnode.Accept(new SetResourcesVisitor(visitorContext), null); rootnode.Accept(new SetPropertiesVisitor(visitorContext, true), null); il.Emit(OpCodes.Ret); initComp.Body = body; exception = null; return true; } catch (Exception e) { exception = e; return false; } } } }