61 строка
1.7 KiB
C#
61 строка
1.7 KiB
C#
// Copyright 2016-2017 Xamarin Inc.
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using System;
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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.Tuner;
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namespace Xamarin.Linker.Steps {
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// This inlining is done, almost exclusively, as a metadata reduction step that
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// occurs before linking so some code is not marked (and shipped in final apps).
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//
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// In many case the AOT'ed native code won't be affected (same size) but the
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// *.aotdata files will be smaller. In some cases the AOT compiler does not
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// inline some _simple_ cases (cross assemblies) so it can reduce the native
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// executable size too (but this is not the step main goal)
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public class InlinerSubStep : ExceptionalSubStep {
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protected override string Name { get; } = "Inliner";
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protected override int ErrorCode { get; } = 2090;
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public override SubStepTargets Targets {
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get {
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return SubStepTargets.Type | SubStepTargets.Method;
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}
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}
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public override bool IsActiveFor (AssemblyDefinition assembly)
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{
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return Annotations.GetAction (assembly) == AssemblyAction.Link;
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}
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protected override void Process (MethodDefinition method)
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{
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if (!method.HasBody)
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return;
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foreach (var il in method.Body.Instructions) {
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if (il.OpCode.Code == Code.Call) {
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var mr = il.Operand as MethodReference;
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if (mr == null)
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continue;
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// this removes type System.Security.SecurityManager (unless referenced by user code)
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if (!mr.HasParameters && mr.DeclaringType.Is ("System.Security", "SecurityManager")) {
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switch (mr.Name) {
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case "EnsureElevatedPermissions":
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il.OpCode = OpCodes.Nop;
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break;
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case "CheckElevatedPermissions":
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// always positive (no security manager)
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il.OpCode = OpCodes.Ldc_I4_1;
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break;
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}
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}
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}
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}
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}
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}
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}
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