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// Copyright (c) 2017 Eric Mellino
// Copyright (c) 2019 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using Mono.Cecil;
using Mono.Cecil.Cil;
using System;
using System.Linq;
using Mono.Collections.Generic;
using System.IO;
using System.Collections.Generic;
using System.Text;
namespace Vk.Rewrite
{
public class Program
{
const string mainVkNamespace = "Vulkan";
static TypeReference s_calliRewriteRef;
static MethodReference s_stringToHGlobalUtf8Ref;
static MethodDefinition s_freeHGlobalRef;
static TypeReference s_stringHandleRef;
public static int Main(string[] args)
{
if ((args.Length < 1) == true || args[0] == null) {
Console.WriteLine ("Error: argument 1 must be the path of VK.dll.");
return -1;
}
string vkDllPath = args[0];
string outputPath = null;
bool rewriteInPlace = false;
if (outputPath == null)
{
outputPath = Path.GetTempFileName ();
rewriteInPlace = true;
}
Rewrite(vkDllPath, outputPath);
if (rewriteInPlace) {
File.Delete (vkDllPath);
File.Copy (outputPath, vkDllPath);
File.Delete (outputPath);
outputPath = vkDllPath;
}
Console.WriteLine (outputPath + " rewrited.");
return 0;
}
private static void Rewrite(string vkDllPath, string outputPath)
{
using (AssemblyDefinition vkDll = AssemblyDefinition.ReadAssembly (vkDllPath))
{
ModuleDefinition mainModule = vkDll.Modules[0];
s_calliRewriteRef = mainModule.GetType (mainVkNamespace+".Generator.CalliRewriteAttribute");
s_stringHandleRef = mainModule.GetType (mainVkNamespace+".StringHandle");
TypeDefinition bindingHelpers = mainModule.GetType(mainVkNamespace+".BindingsHelpers");
s_stringToHGlobalUtf8Ref = bindingHelpers.Methods.Single (md => md.Name == "StringToHGlobalUtf8");
s_freeHGlobalRef = bindingHelpers.Methods.Single (md => md.Name == "FreeHGlobal");
foreach (TypeDefinition type in mainModule.Types)
{
foreach (MethodDefinition method in type.Methods)
{
if (method.CustomAttributes.Any(ca => ca.AttributeType == s_calliRewriteRef))
RewriteMethod (method);
}
}
vkDll.Write(outputPath);
}
}
static void RewriteMethod (MethodDefinition method)
{
ILProcessor il = method.Body.GetILProcessor();
il.Body.Instructions.Clear();
List<VariableDefinition> stringParams = new List<VariableDefinition>();
for (int i = 0; i < method.Parameters.Count; i++)
{
EmitLoadArgument (il, i, method.Parameters);
TypeReference parameterType = method.Parameters[i].ParameterType;
if (parameterType.IsGenericInstance) {
if (parameterType.Name == "Nullable`1")
System.Diagnostics.Debugger.Break ();
}
if (parameterType.FullName == "System.String")
{
VariableDefinition variableDef = new VariableDefinition(s_stringHandleRef);
method.Body.Variables.Add(variableDef);
il.Emit(OpCodes.Call, s_stringToHGlobalUtf8Ref);
il.Emit(OpCodes.Stloc, variableDef);
il.Emit(OpCodes.Ldloc, variableDef);
stringParams.Add(variableDef);
}
else if (parameterType.IsByReference)
{
VariableDefinition byRefVariable = new VariableDefinition(new PinnedType(parameterType));
method.Body.Variables.Add(byRefVariable);
il.Emit(OpCodes.Stloc, byRefVariable);
il.Emit(OpCodes.Ldloc, byRefVariable);
il.Emit(OpCodes.Conv_I);
}
}
FieldDefinition field = method.DeclaringType.Fields.SingleOrDefault(fd => fd.Name == method.Name + "_ptr");
if (field == null)
throw new InvalidOperationException("Can't find function pointer field for " + method.Name);
il.Emit(OpCodes.Ldsfld, field);
CallSite callSite = new CallSite(method.ReturnType) {CallingConvention = MethodCallingConvention.StdCall};
foreach (ParameterDefinition pd in method.Parameters)
{
TypeReference parameterType;
if (pd.ParameterType.IsByReference)
parameterType = new PointerType(pd.ParameterType.GetElementType());
else if (pd.ParameterType.FullName == "System.String")
parameterType = s_stringHandleRef;
else
parameterType = pd.ParameterType;
ParameterDefinition calliPD = new ParameterDefinition(pd.Name, pd.Attributes, parameterType);
callSite.Parameters.Add(calliPD);
}
il.Emit(OpCodes.Calli, callSite);
foreach (VariableDefinition stringVar in stringParams)
{
il.Emit(OpCodes.Ldloc, stringVar);
il.Emit(OpCodes.Call, s_freeHGlobalRef);
}
il.Emit(OpCodes.Ret);
if (method.Body.Variables.Count > 0)
method.Body.InitLocals = true;
}
static void EmitLoadArgument(ILProcessor il, int i, Collection<ParameterDefinition> parameters)
{
switch (i) {
case 0:
il.Emit(OpCodes.Ldarg_0);
break;
case 1:
il.Emit(OpCodes.Ldarg_1);
break;
case 2:
il.Emit(OpCodes.Ldarg_2);
break;
case 3:
il.Emit(OpCodes.Ldarg_3);
break;
default:
il.Emit(OpCodes.Ldarg, i);
break;
}
}
}
}
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