112 строки
3.0 KiB
C#
112 строки
3.0 KiB
C#
// Copyright 2012-2013 Xamarin Inc. All rights reserved.
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//#define DEBUG
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Linker;
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using Mono.Linker.Steps;
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using Mono.Tuner;
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using Xamarin.Linker;
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using Xamarin.Tuner;
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namespace MonoMac.Tuner {
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public class MonoMacNamespaces : IStep {
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public void Process (LinkContext context)
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{
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var profile = (Profile.Current as BaseProfile);
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AssemblyDefinition assembly;
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if (!context.TryGetLinkedAssembly (profile.ProductAssembly, out assembly))
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return;
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HashSet<string> namespaces = new HashSet<string> ();
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foreach (TypeDefinition type in assembly.MainModule.Types) {
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namespaces.Add (type.Namespace);
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}
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// Compute our map
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// there can be multiple namespaces for the same library
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var frameworks = Frameworks.GetFrameworks (((DerivedLinkContext) context).App.Platform, false);
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var map = new Dictionary<string, List<string>> ();
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foreach (var fw in frameworks.Values) {
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if (!map.TryGetValue (fw.LibraryPath, out var list))
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map [fw.LibraryPath] = list = new List<string> ();
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list.Add (fw.Namespace);
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}
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// clean NSObject from loading them
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var nsobject = assembly.MainModule.GetType (Namespaces.Foundation + ".NSObject");
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var nsobject_cctor = nsobject.GetTypeConstructor ();
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var instructions = nsobject_cctor.Body.Instructions;
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for (int i = 0; i < instructions.Count; i++) {
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Instruction ins = instructions [i];
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if (ins.OpCode.Code != Code.Ldstr)
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continue;
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// To be safe we only remove the ones we know about *and*
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// only when we know the namespace is not being used by the app
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// Based on the list from xamcore/src/Foundation/NSObjectMac.cs
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bool remove_dlopen = false;
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if (map.TryGetValue (ins.Operand as string, out var targetNamespaces)) {
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remove_dlopen = !targetNamespaces.Any (v => namespaces.Contains (v));
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}
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#if DEBUG
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else {
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string libname = ins.Operand as string;
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if (libname.StartsWith ("/", StringComparison.Ordinal))
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Console.WriteLine ("Unprocessed library / namespace {0}", libname);
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}
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#endif
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if (remove_dlopen) {
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FieldDefinition f = Nop (ins);
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if (f != null) {
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i += 3;
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nsobject.Fields.Remove (f);
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}
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}
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}
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}
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FieldDefinition Nop (Instruction ins)
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{
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#if DEBUG
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if (ins.OpCode.Code != Code.Ldstr)
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throw new InvalidOperationException ("Expected Ldstr");
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#endif
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// ldstr
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ins.OpCode = OpCodes.Nop;
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ins = ins.Next;
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#if DEBUG
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if (ins.OpCode.Code != Code.Ldc_I4_1)
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throw new InvalidOperationException ("Expected Ldc_I4_1");
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#endif
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// ldc.i4.1
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ins.OpCode = OpCodes.Nop;
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ins = ins.Next;
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#if DEBUG
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if (ins.OpCode.Code != Code.Call)
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throw new InvalidOperationException ("Expected Call");
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#endif
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// call Dlfcn::dlopen (string, int)
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ins.OpCode = OpCodes.Nop;
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ins = ins.Next;
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#if DEBUG
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if (ins.OpCode.Code != Code.Stsfld)
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throw new InvalidOperationException ("Expected Stsfld");
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#endif
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// sfsfld
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ins.OpCode = OpCodes.Nop;
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return ins.Operand as FieldDefinition;
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}
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}
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}
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