initial commit

Library/PackageCache/com.unity.collections@1.2.4/Unity.Collections.LowLevel.ILSupport/README.txt

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+This adds a simple ILSupport extension that adds `ref T AsRef<T>(in T thing)` to
+convert a read-only (in) ref to a regular ref, to avoid defensive copies when calling
+(non-mutating) methods on it.  This is wrapped in UnsafeUtilityEx, as only Unity.Collections
+has InternalsVisibleTo into this library.
+
+Collections.LowLevel.ILSupport can and should be generated by codegen & ilpostprocessors,
+however the ilpostproc infrastructure is unstable.  Given that the result of this is
+constant, we just check in the final DLL.  The source for everything is in the source~
+dir.
+
+To rebuild or to add any functionality:
+- delete the prebuilt DLLs in this directory
+- and rename the source~ dir to source (without the ~)
+- fire up Unity and let it build.  Everything should be successful, you're just now using the runtime-generated DLL.
+- make whatever changes you need to
+- make sure Unity's builds are up to date
+- copy Library/ScriptAssemblies/Unity.Collections.LowLevel.ILSupport.dll into this dir
+- rename source back to source~

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Library/PackageCache/com.unity.collections@1.2.4/Unity.Collections.LowLevel.ILSupport/source~/Unity.Collections.LowLevel.ILSupport.CodeGen/CollectionsUnsafeUtilityPostProcessor.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Threading;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+using Mono.Cecil.Rocks;
+using Unity.CompilationPipeline.Common.Diagnostics;
+using Unity.CompilationPipeline.Common.ILPostProcessing;
+
+namespace Unity.Collections.UnsafeUtility.CodeGen
+{
+    internal class CollectionsUnsafeUtilityPostProcessor : ILPostProcessor
+    {
+        private static CollectionsUnsafeUtilityPostProcessor s_Instance;
+
+        public override ILPostProcessor GetInstance()
+        {
+            if (s_Instance == null)
+                s_Instance = new CollectionsUnsafeUtilityPostProcessor();
+            return s_Instance;
+        }
+
+        public override bool WillProcess(ICompiledAssembly compiledAssembly)
+        {
+            if (compiledAssembly.Name == "Unity.Collections.LowLevel.ILSupport")
+                return true;
+            return false;
+        }
+
+        public override ILPostProcessResult Process(ICompiledAssembly compiledAssembly)
+        {
+            if (!WillProcess(compiledAssembly))
+                return null;
+
+            var assemblyDefinition = AssemblyDefinitionFor(compiledAssembly);
+
+            var ilSupportType = assemblyDefinition.MainModule.Types.FirstOrDefault(t => t.FullName == "Unity.Collections.LowLevel.Unsafe.ILSupport");
+            if (ilSupportType == null)
+                throw new InvalidOperationException();
+
+            InjectUtilityAddressOfIn(ilSupportType);
+            InjectUtilityAsRefIn(ilSupportType);
+
+            var pe = new MemoryStream();
+            var pdb = new MemoryStream();
+            var writerParameters = new WriterParameters
+            {
+                SymbolWriterProvider = new PortablePdbWriterProvider(), SymbolStream = pdb, WriteSymbols = true
+            };
+
+            assemblyDefinition.Write(pe, writerParameters);
+            return new ILPostProcessResult(new InMemoryAssembly(pe.ToArray(), pdb.ToArray()));
+        }
+
+        private void InjectUtilityAddressOfIn(TypeDefinition ctx)
+        {
+            var method = ctx.Methods.Single(m => m.Name.Equals("AddressOf") && m.Parameters[0].IsIn);
+            var il = GetILProcessorForMethod(method);
+
+            il.Append(il.Create(OpCodes.Ldarg_0));
+            il.Append(il.Create(OpCodes.Ret));
+        }
+
+        private void InjectUtilityAsRefIn(TypeDefinition ctx)
+        {
+            var method = ctx.Methods.Single(m => m.Name.Equals("AsRef") && m.Parameters[0].IsIn);
+            var il = GetILProcessorForMethod(method);
+
+            il.Append(il.Create(OpCodes.Ldarg_0));
+            il.Append(il.Create(OpCodes.Ret));
+        }
+
+        internal static AssemblyDefinition AssemblyDefinitionFor(ICompiledAssembly compiledAssembly)
+        {
+            var readerParameters = new ReaderParameters
+            {
+                SymbolStream = new MemoryStream(compiledAssembly.InMemoryAssembly.PdbData.ToArray()),
+                SymbolReaderProvider = new PortablePdbReaderProvider(),
+                ReadingMode = ReadingMode.Immediate
+            };
+
+            var peStream = new MemoryStream(compiledAssembly.InMemoryAssembly.PeData.ToArray());
+            var assemblyDefinition = AssemblyDefinition.ReadAssembly(peStream, readerParameters);
+
+            return assemblyDefinition;
+        }
+
+        private static ILProcessor GetILProcessorForMethod(TypeDefinition ctx, string methodName, bool clear = true)
+        {
+            var method = ctx.Methods.Single(m => m.Name.Equals(methodName) && m.HasGenericParameters);
+            return GetILProcessorForMethod(method, clear);
+        }
+
+        private static ILProcessor GetILProcessorForMethod(MethodDefinition method, bool clear = true)
+        {
+            var ilProcessor = method.Body.GetILProcessor();
+
+            if (clear)
+            {
+                ilProcessor.Body.Instructions.Clear();
+                ilProcessor.Body.Variables.Clear();
+                ilProcessor.Body.ExceptionHandlers.Clear();
+            }
+
+            return ilProcessor;
+        }
+    }
+}
+

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Library/PackageCache/com.unity.collections@1.2.4/Unity.Collections.LowLevel.ILSupport/source~/Unity.Collections.LowLevel.ILSupport/ILSupport.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Runtime.CompilerServices;
+
+[assembly: InternalsVisibleTo("Unity.Collections")]
+
+namespace Unity.Collections.LowLevel.Unsafe
+{
+    internal unsafe static class ILSupport
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void* AddressOf<T>(in T thing)
+            where T : struct
+        {
+            throw new NotImplementedException();
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static ref T AsRef<T>(in T thing)
+            where T : struct
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

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