static void EmitCallParameter(ILGenerator il, MethodBase original, MethodInfo patch, Dictionary <string, LocalBuilder> variables, bool allowFirsParamPassthrough, bool isIl2Cpp)
{
var isInstance = original.IsStatic == false;
var originalParameters = original.GetParameters();
var originalParameterNames = originalParameters.Select(p => p.Name).ToArray();
// check for passthrough using first parameter (which must have same type as return type)
var parameters = patch.GetParameters().ToList();
if (allowFirsParamPassthrough && patch.ReturnType != typeof(void) && parameters.Count > 0 && parameters[0].ParameterType == patch.ReturnType)
{
parameters.RemoveRange(0, 1);
}
foreach (var patchParam in parameters)
{
if (patchParam.Name == ORIGINAL_METHOD_PARAM)
{
var constructorInfo = original as ConstructorInfo;
if (constructorInfo != null)
{
Emitter.Emit(il, OpCodes.Ldtoken, constructorInfo);
Emitter.Emit(il, OpCodes.Call, getMethodMethod);
continue;
}
var methodInfo = original as MethodInfo;
if (methodInfo != null)
{
Emitter.Emit(il, OpCodes.Ldtoken, methodInfo);
Emitter.Emit(il, OpCodes.Call, getMethodMethod);
continue;
}
Emitter.Emit(il, OpCodes.Ldnull);
continue;
}
if (patchParam.Name == INSTANCE_PARAM)
{
if (original.IsStatic)
{
Emitter.Emit(il, OpCodes.Ldnull);
}
else if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldarga, 0); // probably won't work or will be useless
}
else
{
Emitter.Emit(il, OpCodes.Ldarg_0);
}
continue;
}
if (patchParam.Name.StartsWith(INSTANCE_FIELD_PREFIX))
{
var fieldName = patchParam.Name.Substring(INSTANCE_FIELD_PREFIX.Length);
if (isIl2Cpp)
{
if (patchParam.ParameterType.IsByRef)
{
throw new NotSupportedException("Ref parameters to fields are not supported in IL2CPP patches");
}
var getterMethod = AccessTools.Property(original.DeclaringType, fieldName)?.GetMethod;
if (getterMethod == null)
{
throw new ArgumentException("No such field defined in class " + original.DeclaringType.FullName, fieldName);
}
if (!getterMethod.IsStatic)
{
Emitter.Emit(il, OpCodes.Ldarg_0);
}
var opcode = getterMethod.IsVirtual ? OpCodes.Callvirt : OpCodes.Call;
Emitter.Emit(il, opcode, getterMethod);
}
else
{
FieldInfo fieldInfo;
if (fieldName.All(char.IsDigit))
{
fieldInfo = AccessTools.Field(original.DeclaringType, int.Parse(fieldName));
if (fieldInfo == null)
{
throw new ArgumentException("No field found at given index in class " + original.DeclaringType.FullName, fieldName);
}
}
else
{
fieldInfo = AccessTools.Field(original.DeclaringType, fieldName);
if (fieldInfo == null)
{
throw new ArgumentException("No such field defined in class " + original.DeclaringType.FullName, fieldName);
}
}
if (fieldInfo.IsStatic)
{
if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldsflda, fieldInfo);
}
else
{
Emitter.Emit(il, OpCodes.Ldsfld, fieldInfo);
}
}
else
{
if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldarg_0);
Emitter.Emit(il, OpCodes.Ldflda, fieldInfo);
}
else
{
Emitter.Emit(il, OpCodes.Ldarg_0);
Emitter.Emit(il, OpCodes.Ldfld, fieldInfo);
}
}
}
continue;
}
if (patchParam.Name == STATE_VAR)
{
var ldlocCode = patchParam.ParameterType.IsByRef ? OpCodes.Ldloca : OpCodes.Ldloc;
Emitter.Emit(il, ldlocCode, variables[patch.DeclaringType.FullName]);
continue;
}
if (patchParam.Name == RESULT_VAR)
{
if (AccessTools.GetReturnedType(original) == typeof(void))
{
throw new Exception("Cannot get result from void method " + original.FullDescription());
}
var ldlocCode = patchParam.ParameterType.IsByRef ? OpCodes.Ldloca : OpCodes.Ldloc;
Emitter.Emit(il, ldlocCode, variables[RESULT_VAR]);
continue;
}
int idx;
if (patchParam.Name.StartsWith(PARAM_INDEX_PREFIX))
{
var val = patchParam.Name.Substring(PARAM_INDEX_PREFIX.Length);
if (!int.TryParse(val, out idx))
{
throw new Exception("Parameter " + patchParam.Name + " does not contain a valid index");
}
if (idx < 0 || idx >= originalParameters.Length)
{
throw new Exception("No parameter found at index " + idx);
}
}
else
{
idx = GetArgumentIndex(patch, originalParameterNames, patchParam);
if (idx == -1)
{
throw new Exception("Parameter \"" + patchParam.Name + "\" not found in method " + original.FullDescription());
}
}
// original -> patch opcode
// --------------------------------------
// 1 normal -> normal : LDARG
// 2 normal -> ref/out : LDARGA
// 3 ref/out -> normal : LDARG, LDIND_x
// 4 ref/out -> ref/out : LDARG
//
var originalIsNormal = originalParameters[idx].IsOut == false && originalParameters[idx].ParameterType.IsByRef == false;
var patchIsNormal = patchParam.IsOut == false && patchParam.ParameterType.IsByRef == false;
var patchArgIndex = idx + (isInstance ? 1 : 0);
// Case 1 + 4
if (originalIsNormal == patchIsNormal)
{
Emitter.Emit(il, OpCodes.Ldarg, patchArgIndex);
continue;
}
// Case 2
if (originalIsNormal && patchIsNormal == false)
{
Emitter.Emit(il, OpCodes.Ldarga, patchArgIndex);
continue;
}
// Case 3
Emitter.Emit(il, OpCodes.Ldarg, patchArgIndex);
Emitter.Emit(il, LoadIndOpCodeFor(originalParameters[idx].ParameterType));
}
}
static void EmitCallParameter(ILGenerator il, MethodBase original, MethodInfo patch, Dictionary <string, LocalBuilder> variables, bool allowFirsParamPassthrough)
{
var isInstance = original.IsStatic == false;
var originalParameters = original.GetParameters();
var originalParameterNames = originalParameters.Select(p => p.Name).ToArray();
// check for passthrough using first parameter (which must have same type as return type)
var parameters = patch.GetParameters().ToList();
if (allowFirsParamPassthrough && patch.ReturnType != typeof(void) && parameters.Count > 0 && parameters[0].ParameterType == patch.ReturnType)
{
parameters.RemoveRange(0, 1);
}
foreach (var patchParam in parameters)
{
if (patchParam.Name == ORIGINAL_METHOD_PARAM)
{
var constructorInfo = original as ConstructorInfo;
if (constructorInfo != null)
{
Emitter.Emit(il, OpCodes.Ldtoken, constructorInfo);
Emitter.Emit(il, OpCodes.Call, getMethodMethod);
continue;
}
var methodInfo = original as MethodInfo;
if (methodInfo != null)
{
Emitter.Emit(il, OpCodes.Ldtoken, methodInfo);
Emitter.Emit(il, OpCodes.Call, getMethodMethod);
continue;
}
Emitter.Emit(il, OpCodes.Ldnull);
continue;
}
if (patchParam.Name == INSTANCE_PARAM)
{
if (original.IsStatic)
{
Emitter.Emit(il, OpCodes.Ldnull);
}
else if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldarga, 0); // probably won't work or will be useless
}
else
{
Emitter.Emit(il, OpCodes.Ldarg_0);
}
continue;
}
if (patchParam.Name.StartsWith(INSTANCE_FIELD_PREFIX))
{
var fieldInfo = AccessTools.Field(original.DeclaringType, patchParam.Name.Substring(INSTANCE_FIELD_PREFIX.Length));
if (fieldInfo.IsStatic)
{
if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldsflda, fieldInfo);
}
else
{
Emitter.Emit(il, OpCodes.Ldsfld, fieldInfo);
}
}
else
{
if (patchParam.ParameterType.IsByRef)
{
Emitter.Emit(il, OpCodes.Ldarg_0);
Emitter.Emit(il, OpCodes.Ldflda, fieldInfo);
}
else
{
Emitter.Emit(il, OpCodes.Ldarg_0);
Emitter.Emit(il, OpCodes.Ldfld, fieldInfo);
}
}
continue;
}
if (patchParam.Name == STATE_VAR)
{
var ldlocCode = patchParam.ParameterType.IsByRef ? OpCodes.Ldloca : OpCodes.Ldloc;
Emitter.Emit(il, ldlocCode, variables[patch.DeclaringType.FullName]);
continue;
}
if (patchParam.Name == RESULT_VAR)
{
if (AccessTools.GetReturnedType(original) == typeof(void))
{
throw new Exception("Cannot get result from void method " + original.FullDescription());
}
var ldlocCode = patchParam.ParameterType.IsByRef ? OpCodes.Ldloca : OpCodes.Ldloc;
Emitter.Emit(il, ldlocCode, variables[RESULT_VAR]);
continue;
}
var patchParamName = patchParam.Name;
var originalName = patchParam.GetParameterOverride();
if (originalName != null)
{
patchParamName = originalName;
}
else
{
originalName = patch.GetParameterOverride(patchParamName, true);
if (originalName != null)
{
patchParamName = originalName;
}
}
var idx = Array.IndexOf(originalParameterNames, patchParamName);
if (idx == -1)
{
throw new Exception("Parameter \"" + patchParam.Name + "\" not found in method " + original.FullDescription());
}
// original -> patch opcode
// --------------------------------------
// 1 normal -> normal : LDARG
// 2 normal -> ref/out : LDARGA
// 3 ref/out -> normal : LDARG, LDIND_x
// 4 ref/out -> ref/out : LDARG
//
var originalIsNormal = originalParameters[idx].IsOut == false && originalParameters[idx].ParameterType.IsByRef == false;
var patchIsNormal = patchParam.IsOut == false && patchParam.ParameterType.IsByRef == false;
var patchArgIndex = idx + (isInstance ? 1 : 0);
// Case 1 + 4
if (originalIsNormal == patchIsNormal)
{
Emitter.Emit(il, OpCodes.Ldarg, patchArgIndex);
continue;
}
// Case 2
if (originalIsNormal && patchIsNormal == false)
{
Emitter.Emit(il, OpCodes.Ldarga, patchArgIndex);
continue;
}
// Case 3
Emitter.Emit(il, OpCodes.Ldarg, patchArgIndex);
Emitter.Emit(il, LoadIndOpCodeFor(originalParameters[idx].ParameterType));
}
}