60 строки
1.8 KiB
C#
60 строки
1.8 KiB
C#
// Copyright 2012-2013, 2015 Xamarin Inc. All rights reserved.
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using System;
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using System.Collections;
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using Mono.Cecil;
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using Mono.Linker;
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using Mono.Linker.Steps;
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namespace Xamarin.Linker {
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// MobileMarkStep process a bit more data and that can be used to sweep
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// more metadata afterward. OTOH sweeping them without the extra marking
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// would produce invalid assemblies
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public class MobileSweepStep : SweepStep {
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public AssemblyAction CurrentAction { get; private set; }
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protected override void Process ()
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{
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base.Process ();
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var assemblies = Context.GetAssemblies ();
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foreach (var assembly in assemblies) {
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CurrentAction = Annotations.GetAction (assembly);
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switch (CurrentAction) {
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case AssemblyAction.Link:
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case AssemblyAction.Save:
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SweepAssembly (assembly);
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break;
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}
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}
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}
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protected virtual void SweepAssembly (AssemblyDefinition assembly)
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{
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SweepMainModule (assembly.MainModule);
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}
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protected void SweepMainModule (ModuleDefinition main)
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{
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// if we save (only or by linking) then unmarked exports (e.g. forwarders) must be cleaned
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// or they can point to nothing which will break later (e.g. when re-loading for stripping IL)
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// reference: https://bugzilla.xamarin.com/show_bug.cgi?id=36577
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if (main.HasExportedTypes)
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SweepCollection (main.ExportedTypes);
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// only when linking should we remove module references, if we (re)save the assembly then
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// the entrypoints (for p/invokes) will be required later
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// reference: https://bugzilla.xamarin.com/show_bug.cgi?id=35372
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if (main.HasModuleReferences && (CurrentAction == AssemblyAction.Link))
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SweepCollection (main.ModuleReferences);
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}
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protected void SweepCollection (IList list)
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{
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for (int i = 0; i < list.Count; i++)
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if (!Annotations.IsMarked ((IMetadataTokenProvider) list [i]))
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list.RemoveAt (i--);
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}
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}
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} |