mirror of
https://github.com/Ryujinx/Opentk.git
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574 lines
23 KiB
C#
574 lines
23 KiB
C#
// OpenTK.Rewrite: IL rewriter for OpenTK.dll
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// Copyright (C) 2013 Stefanos Apostolopoulos
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using Mono.Cecil.Rocks;
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namespace OpenTK.Rewrite
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{
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// Replaces OpenTK.InteropHelper method instances
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// with the s IL instructions.
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class Program
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{
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static void Main(string[] args)
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{
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if (args.Length == 0)
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{
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Console.WriteLine("Usage: rewrite [file.dll] [file.snk]");
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return;
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}
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var program = new Program();
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var file = args[0];
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var key = args.Length >= 2 ? args[1] : null;
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program.Rewrite(file, key);
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}
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// mscorlib types
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static AssemblyDefinition mscorlib;
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static TypeDefinition TypeMarshal;
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static TypeDefinition TypeStringArray;
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static TypeDefinition TypeStringBuilder;
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static TypeDefinition TypeVoid;
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static TypeDefinition TypeIntPtr;
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// OpenTK.BindingsBase
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static TypeDefinition TypeBindingsBase;
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void Rewrite(string file, string keyfile)
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{
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// Specify assembly read and write parameters
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// We want to keep a valid symbols file (pdb or mdb)
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var read_params = new ReaderParameters();
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var write_params = new WriterParameters();
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var pdb = Path.ChangeExtension(file, "pdb");
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var mdb = Path.ChangeExtension(file, "mdb");
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ISymbolReaderProvider provider = null;
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if (File.Exists(pdb))
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{
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provider = new Mono.Cecil.Pdb.PdbReaderProvider();
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}
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else if (File.Exists(mdb))
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{
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provider = new Mono.Cecil.Mdb.MdbReaderProvider();
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}
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read_params.SymbolReaderProvider = provider;
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read_params.ReadSymbols = true;
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write_params.WriteSymbols = true;
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if (!String.IsNullOrEmpty(keyfile) && File.Exists(keyfile))
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{
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keyfile = Path.GetFullPath(keyfile);
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var fs = new FileStream(keyfile, FileMode.Open);
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var keypair = new System.Reflection.StrongNameKeyPair(fs);
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fs.Close();
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write_params.StrongNameKeyPair = keypair;
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}
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else
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{
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Console.Error.WriteLine("No keyfile specified or keyfile missing.");
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}
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// Load assembly and process all modules
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var assembly = AssemblyDefinition.ReadAssembly(file, read_params);
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var rewritten = assembly.CustomAttributes.FirstOrDefault(a => a.AttributeType.Name == "RewrittenAttribute");
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if (rewritten == null)
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{
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foreach (var module in assembly.Modules)
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{
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foreach (var reference in module.AssemblyReferences)
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{
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var resolved = module.AssemblyResolver.Resolve(reference);
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if (reference.Name == "mscorlib")
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{
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mscorlib = resolved;
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}
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}
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}
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if (mscorlib == null)
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{
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Console.Error.WriteLine("Failed to locate mscorlib");
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return;
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}
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TypeMarshal = mscorlib.MainModule.GetType("System.Runtime.InteropServices.Marshal");
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TypeStringArray = mscorlib.MainModule.GetType("System.String").MakeArrayType().Resolve();
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TypeStringBuilder = mscorlib.MainModule.GetType("System.Text.StringBuilder");
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TypeVoid = mscorlib.MainModule.GetType("System.Void");
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TypeIntPtr = mscorlib.MainModule.GetType("System.IntPtr");
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TypeBindingsBase = assembly.Modules.Select(m => m.GetType("OpenTK.BindingsBase")).First();
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foreach (var module in assembly.Modules)
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{
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foreach (var type in module.Types)
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{
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Rewrite(type);
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}
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}
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}
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else
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{
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Console.Error.WriteLine("Error: assembly has already been rewritten");
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}
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// Save rewritten assembly
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assembly.Write(file, write_params);
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}
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void Rewrite(TypeDefinition type)
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{
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var entry_points = type.Fields.FirstOrDefault(f => f.Name == "EntryPoints");
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if (entry_points != null)
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{
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// Build list of entry point signatures (one per entry point)
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var entry_signatures = new List<MethodDefinition>();
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entry_signatures.AddRange(type.Methods
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.Where(t => t.CustomAttributes.Any(a => a.AttributeType.Name == "SlotAttribute")));
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Rewrite(type, entry_points, entry_signatures);
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RemoveNativeSignatures(type, entry_signatures);
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}
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if (type.Name == "RewrittenAttribute")
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{
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var rewritten_constructor = type.GetConstructors().First();
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var rewritten = new CustomAttribute(rewritten_constructor);
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rewritten.ConstructorArguments.Add(new CustomAttributeArgument(
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type.Module.Import(mscorlib.MainModule.GetType("System.Boolean")), true));
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type.Module.Assembly.CustomAttributes.Add(rewritten);
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}
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}
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void Rewrite(TypeDefinition type, FieldDefinition entry_points,
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List<MethodDefinition> entry_signatures)
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{
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// Rewrite all wrapper methods
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var wrapper_signatures = new List<MethodDefinition>();
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wrapper_signatures.AddRange(type.Methods
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.Where(m => m.IsPublic && m.CustomAttributes.Any(a => a.AttributeType.Name == "AutoGeneratedAttribute")));
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foreach (var wrapper in wrapper_signatures)
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{
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var autogenerated = wrapper.CustomAttributes
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.Where(a => a.AttributeType.Name == "AutoGeneratedAttribute");
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if (autogenerated.Count() > 0)
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{
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var signature_name = (string)autogenerated.First()
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.Fields.First(f => f.Name == "EntryPoint").Argument.Value;
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var signature = entry_signatures.First(s => s.Name == signature_name);
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var slot = (int)signature.CustomAttributes
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.First(a => a.AttributeType.Name == "SlotAttribute")
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.ConstructorArguments[0].Value;
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ProcessMethod(wrapper, signature, slot, entry_points);
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}
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}
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RemoveSupportingAttributes(type);
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if (type.NestedTypes.Count > 0)
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{
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foreach (var nested_type in type.NestedTypes)
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{
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Rewrite(nested_type, entry_points, entry_signatures);
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}
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}
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}
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void RemoveNativeSignatures(TypeDefinition type, List<MethodDefinition> methods)
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{
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while (methods.Count > 0)
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{
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type.Methods.Remove(methods.Last());
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methods.RemoveAt(methods.Count - 1);
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}
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}
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void RemoveSupportingAttributes(TypeDefinition type)
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{
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foreach (var method in type.Methods)
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{
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var attr = method.CustomAttributes;
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for (int i = 0; i < attr.Count; i++)
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{
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if (attr[i].AttributeType.Name == "AutoGeneratedAttribute")
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{
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attr.RemoveAt(i);
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i--;
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}
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}
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}
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}
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// Create body for method
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static void ProcessMethod(MethodDefinition wrapper, MethodDefinition native, int slot, FieldDefinition entry_points)
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{
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var nint = wrapper.DeclaringType.Module.Import(mscorlib.MainModule.GetType("System.IntPtr"));
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var body = wrapper.Body;
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var il = body.GetILProcessor();
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var instructions = body.Instructions;
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instructions.Clear();
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// Declare pinned variables for every reference and array parameter
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// and push each parameter on the stack
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EmitParameters(wrapper, nint, body, il);
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// Patch convenience wrappers
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if (wrapper.Parameters.Count < native.Parameters.Count)
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{
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int parameter_count = EmitParameters(wrapper, nint, body, il);
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int difference = native.Parameters.Count - parameter_count;
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EmitConvenienceWrapper(wrapper, native, difference, body, il);
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}
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// push the entry point address on the stack
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EmitEntryPoint(entry_points, il, slot);
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// issue calli
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EmitCall(il, native);
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if (wrapper.ReturnType.Name != "Void")
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{
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EmitReturnTypeWrapper(wrapper, native, body, il);
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}
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if (wrapper.Parameters.Any(p => p.ParameterType.Name == "StringBuilder"))
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{
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EmitStringBuilderEpilogue(wrapper, native, body, il);
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}
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// return
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il.Emit(OpCodes.Ret);
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if (body.Variables.Count > 0)
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{
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// Required for verifiable executables
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// (otherwise peverify complains bitterly)
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body.InitLocals = true;
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}
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body.OptimizeMacros();
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}
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private static void EmitReturnTypeWrapper(MethodDefinition wrapper, MethodDefinition native, MethodBody body, ILProcessor il)
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{
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if (wrapper.Parameters.Count < native.Parameters.Count)
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{
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// Convenience wrapper. The result is stored in the last local variable
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il.Emit(OpCodes.Ldloc, body.Variables.Count - 1);
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}
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else if (wrapper.ReturnType != native.ReturnType)
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{
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if (wrapper.ReturnType.Name == "String")
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{
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// String return-type wrapper
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// return new string((sbyte*)((void*)GetString()));
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var intptr_to_voidpointer = wrapper.Module.Import(mscorlib.MainModule.GetType("System.IntPtr").GetMethods()
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.First(m =>
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{
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return
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m.Name == "op_Explicit" &&
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m.ReturnType.Name == "Void*";
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}));
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var string_constructor = wrapper.Module.Import(mscorlib.MainModule.GetType("System.String").GetConstructors()
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.First(m =>
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{
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var p = m.Parameters;
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return p.Count > 0 && p[0].ParameterType.Name == "SByte*";
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}));
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il.Emit(OpCodes.Call, intptr_to_voidpointer);
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il.Emit(OpCodes.Newobj, string_constructor);
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}
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else if (wrapper.ReturnType.Resolve().IsEnum)
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{
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// Nothing to do
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}
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else
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{
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Console.Error.WriteLine("Return wrapper for '{1}' not implemented yet ({0})", native.Name, wrapper.ReturnType.Name);
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}
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}
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else
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{
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// nothing to do, the native call leaves the return value
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// on the stack and we return that unmodified to the caller.
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}
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}
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static void EmitStringBuilderEpilogue(MethodDefinition wrapper, MethodDefinition native, MethodBody body, ILProcessor il)
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{
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for (int i = 0; i < wrapper.Parameters.Count; i++)
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{
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var p = wrapper.Parameters[i].ParameterType;
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if (p.Name == "StringBuilder")
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{
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// void GetShaderInfoLog(..., StringBuilder foo)
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// try {
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// foo_sb_ptr = Marshal.AllocHGlobal(sb.Capacity + 1); -- already emitted
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// glGetShaderInfoLog(..., foo_sb_ptr); -- already emitted
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// MarshalPtrToStringBuilder(foo_sb_ptr, foo);
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// }
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// finally {
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// Marshal.FreeHGlobal(foo_sb_ptr);
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// }
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// Make sure we have imported BindingsBase::MasrhalPtrToStringBuilder and Marshal::FreeHGlobal
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var ptr_to_sb = wrapper.Module.Import(TypeBindingsBase.Methods.First(m => m.Name == "MarshalPtrToStringBuilder"));
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var free_hglobal = wrapper.Module.Import(TypeMarshal.Methods.First(m => m.Name == "FreeHGlobal"));
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var block = new ExceptionHandler(ExceptionHandlerType.Finally);
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block.TryStart = body.Instructions[0];
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var variable_name = p.Name + " _sb_ptr";
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var v = body.Variables.First(m => m.Name == variable_name);
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il.Emit(OpCodes.Ldloc, v.Index);
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il.Emit(OpCodes.Ldarg, i);
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il.Emit(OpCodes.Call, ptr_to_sb);
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block.TryEnd = body.Instructions.Last();
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block.HandlerStart = body.Instructions.Last();
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il.Emit(OpCodes.Ldloc, v.Index);
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il.Emit(OpCodes.Call, free_hglobal);
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block.HandlerEnd = body.Instructions.Last();
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}
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}
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}
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static void EmitStringArrayParameter(MethodDefinition wrapper, TypeReference p, MethodBody body, ILProcessor il)
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{
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// string[] masrhaling:
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// IntPtr ptr = MarshalStringArrayToPtr(strings);
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// try {
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// calli
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// }
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// finally {
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// UnmarshalStringArray(ptr);
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// }
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var marshal_str_array_to_ptr = wrapper.Module.Import(TypeBindingsBase.Methods.First(m => m.Name == "MarshalStringArrayToPtr"));
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// IntPtr ptr;
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var variable_name = p.Name + " _string_array_ptr";
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body.Variables.Add(new VariableDefinition(variable_name, TypeIntPtr));
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int index = body.Variables.Count - 1;
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// ptr = MarshalStringArrayToPtr(strings);
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il.Emit(OpCodes.Call, marshal_str_array_to_ptr);
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il.Emit(OpCodes.Stloc, index);
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il.Emit(OpCodes.Ldloc, index);
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// The finally block will be emitted in the function epilogue
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}
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static void EmitStringArrayEpilogue(MethodDefinition wrapper, MethodDefinition native, MethodBody body, ILProcessor il)
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{
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for (int i = 0; i < wrapper.Parameters.Count; i++)
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{
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var p = wrapper.Parameters[i].ParameterType;
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if (p.Name == "String" && p.IsArray)
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{
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var free = wrapper.Module.Import(TypeBindingsBase.Methods.First(m => m.Name == "FreeStringArrayPtr"));
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var get_length = wrapper.Module.Import(TypeStringArray.Methods.First(m => m.Name == "get_Length"));
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// FreeStringArrayPtr(string_array_ptr, string_array.Length)
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var variable_name = p.Name + "_string_array_ptr";
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var v = body.Variables.First(m => m.Name == variable_name);
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il.Emit(OpCodes.Ldloc, v.Index);
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il.Emit(OpCodes.Ldarg, i);
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il.Emit(OpCodes.Callvirt, get_length);
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il.Emit(OpCodes.Call, free);
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}
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}
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}
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private static void EmitConvenienceWrapper(MethodDefinition wrapper,
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MethodDefinition native, int difference, MethodBody body, ILProcessor il)
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{
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if (difference == 2)
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{
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// Convert sized out-array/reference to return value, for example:
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// void GenTextures(int n, int[] textures) -> int GenTexture()
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// {
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// const int n = 1;
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// int buffers;
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// calli GenTextures(n, &textures);
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// return result;
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// }
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body.Variables.Add(new VariableDefinition(native.Parameters.Last().ParameterType));
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il.Emit(OpCodes.Ldc_I4, 1); // const int n = 1
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il.Emit(OpCodes.Ldloca, body.Variables.Count - 1); // &buffers
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}
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else if (difference == 1 && wrapper.ReturnType.Name != "Void")
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{
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// Convert unsized out-array/reference to return value, for example:
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// void GetBoolean(GetPName pname, out bool data) -> bool GetBoolean(GetPName pname)
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// {
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// bool result;
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// GetBooleanv(pname, &result);
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// return result;
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// }
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body.Variables.Add(new VariableDefinition(wrapper.ReturnType));
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il.Emit(OpCodes.Ldloca, body.Variables.Count - 1);
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}
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else if (difference == 1 && wrapper.ReturnType.Name == "Void")
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{
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// Convert in-array/reference to single element, for example:
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// void DeleteTextures(int n, ref int textures) -> void DeleteTexture(int texture)
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// {
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// const int n = 1;
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// calli DeleteTextures(n, &textures);
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// }
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il.Emit(OpCodes.Ldc_I4, 1); // const int n = 1
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il.Emit(OpCodes.Ldarga, wrapper.Parameters.Last()); // &textures
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}
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else
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{
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Console.Error.WriteLine("Unknown wrapper type for ({0})", native.Name);
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}
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}
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static int EmitParameters(MethodDefinition method, TypeReference nint, MethodBody body, ILProcessor il)
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{
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int i;
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for (i = 0; i < method.Parameters.Count; i++)
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{
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var p = method.Module.Import(method.Parameters[i].ParameterType);
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il.Emit(OpCodes.Ldarg, i);
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if (p.Name == "StringBuilder")
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{
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// void GetShaderInfoLog(..., StringBuilder foo)
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// IntPtr foo_sb_ptr;
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// try {
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// foo_sb_ptr = Marshal.AllocHGlobal(sb.Capacity + 1);
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// glGetShaderInfoLog(..., foo_sb_ptr);
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// MarshalPtrToStringBuilder(foo_sb_ptr, sb);
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// }
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// finally {
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// Marshal.FreeHGlobal(sb_ptr);
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// }
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// Make sure we have imported StringBuilder::Capacity and Marshal::AllocHGlobal
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var sb_get_capacity = method.Module.Import(TypeStringBuilder.Methods.First(m => m.Name == "get_Capacity"));
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var alloc_hglobal = method.Module.Import(TypeMarshal.Methods.First(m => m.Name == "AllocHGlobal"));
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// IntPtr ptr;
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var variable_name = p.Name + " _sb_ptr";
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body.Variables.Add(new VariableDefinition(variable_name, nint));
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int index = body.Variables.Count - 1;
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// ptr = Marshal.AllocHGlobal(sb.Capacity + 1);
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il.Emit(OpCodes.Callvirt, sb_get_capacity);
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il.Emit(OpCodes.Call, alloc_hglobal);
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il.Emit(OpCodes.Stloc, index);
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il.Emit(OpCodes.Ldloc, index);
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// We'll emit the try-finally block in the epilogue implementation,
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// because we haven't yet emitted all necessary instructions here.
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}
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else if (p.IsByReference)
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{
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body.Variables.Add(new VariableDefinition(new PinnedType(p)));
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var index = body.Variables.Count - 1;
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il.Emit(OpCodes.Stloc, index);
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il.Emit(OpCodes.Ldloc, index);
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il.Emit(OpCodes.Conv_I);
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}
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else if (p.IsArray)
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{
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if (p.Name != method.Module.Import(typeof(string[])).Name)
|
|
{
|
|
// Pin the array and pass the address
|
|
// of its first element.
|
|
var element_type = p.GetElementType();
|
|
body.Variables.Add(new VariableDefinition(new PinnedType(new ByReferenceType(element_type))));
|
|
int pinned_index = body.Variables.Count - 1;
|
|
|
|
var empty = il.Create(OpCodes.Ldc_I4, 0);
|
|
var pin = il.Create(OpCodes.Ldarg, i);
|
|
var end = il.Create(OpCodes.Stloc, pinned_index);
|
|
|
|
// if (array == null) goto empty
|
|
il.Emit(OpCodes.Brfalse, empty);
|
|
|
|
// else if (array.Length != 0) goto pin
|
|
il.Emit(OpCodes.Ldarg, i);
|
|
il.Emit(OpCodes.Ldlen);
|
|
il.Emit(OpCodes.Conv_I4);
|
|
il.Emit(OpCodes.Brtrue, pin);
|
|
|
|
// empty: IntPtr ptr = IntPtr.Zero
|
|
il.Append(empty);
|
|
il.Emit(OpCodes.Conv_U);
|
|
il.Emit(OpCodes.Br, end);
|
|
|
|
// pin: &array[0]
|
|
il.Append(pin);
|
|
il.Emit(OpCodes.Ldc_I4, 0);
|
|
il.Emit(OpCodes.Ldelema, element_type);
|
|
|
|
// end: fixed (IntPtr ptr = &array[0])
|
|
il.Append(end);
|
|
il.Emit(OpCodes.Ldloc, pinned_index);
|
|
il.Emit(OpCodes.Conv_I);
|
|
}
|
|
else
|
|
{
|
|
EmitStringArrayParameter(method, p, body, il);
|
|
}
|
|
}
|
|
}
|
|
return i;
|
|
}
|
|
|
|
static void EmitEntryPoint(FieldDefinition entry_points, ILProcessor il, int slot)
|
|
{
|
|
il.Emit(OpCodes.Ldsfld, entry_points);
|
|
il.Emit(OpCodes.Ldc_I4, slot);
|
|
il.Emit(OpCodes.Ldelem_I);
|
|
}
|
|
|
|
static void EmitCall(ILProcessor il, MethodReference reference)
|
|
{
|
|
var signature = new CallSite(reference.ReturnType)
|
|
{
|
|
CallingConvention = MethodCallingConvention.StdCall,
|
|
};
|
|
|
|
foreach (var p in reference.Parameters)
|
|
{
|
|
signature.Parameters.Add(p);
|
|
}
|
|
|
|
// Since the last parameter is always the entry point address,
|
|
// we do not need any special preparation before emiting calli.
|
|
il.Emit(OpCodes.Calli, signature);
|
|
}
|
|
}
|
|
}
|