419 lines
14 KiB
C#
419 lines
14 KiB
C#
using Harmony.ILCopying;
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Reflection;
|
|
using System.Reflection.Emit;
|
|
|
|
namespace Harmony
|
|
{
|
|
public static class MethodPatcher
|
|
{
|
|
// special parameter names that can be used in prefix and postfix methods
|
|
//
|
|
public static string INSTANCE_PARAM = "__instance";
|
|
public static string ORIGINAL_METHOD_PARAM = "__originalMethod";
|
|
public static string RESULT_VAR = "__result";
|
|
public static string STATE_VAR = "__state";
|
|
public static string PARAM_INDEX_PREFIX = "__";
|
|
public static string INSTANCE_FIELD_PREFIX = "___";
|
|
|
|
// in case of trouble, set to true to write dynamic method to desktop as a dll
|
|
// won't work for all methods because of the inability to extend a type compared
|
|
// to the way DynamicTools.CreateDynamicMethod works
|
|
//
|
|
static readonly bool DEBUG_METHOD_GENERATION_BY_DLL_CREATION = false;
|
|
|
|
// for fixing old harmony bugs
|
|
[UpgradeToLatestVersion(1)]
|
|
public static DynamicMethod CreatePatchedMethod(MethodBase original, List<MethodInfo> prefixes, List<MethodInfo> postfixes, List<MethodInfo> transpilers)
|
|
{
|
|
return CreatePatchedMethod(original, "HARMONY_PATCH_1.1.1", prefixes, postfixes, transpilers);
|
|
}
|
|
|
|
public static DynamicMethod CreatePatchedMethod(MethodBase original, string harmonyInstanceID, List<MethodInfo> prefixes, List<MethodInfo> postfixes, List<MethodInfo> transpilers)
|
|
{
|
|
try
|
|
{
|
|
if (HarmonyInstance.DEBUG) FileLog.LogBuffered("### Patch " + original.DeclaringType + ", " + original);
|
|
|
|
var idx = prefixes.Count() + postfixes.Count();
|
|
var patch = DynamicTools.CreateDynamicMethod(original, "_Patch" + idx);
|
|
if (patch == null)
|
|
return null;
|
|
|
|
var il = patch.GetILGenerator();
|
|
|
|
// for debugging
|
|
AssemblyBuilder assemblyBuilder = null;
|
|
TypeBuilder typeBuilder = null;
|
|
if (DEBUG_METHOD_GENERATION_BY_DLL_CREATION)
|
|
il = DynamicTools.CreateSaveableMethod(original, "_Patch" + idx, out assemblyBuilder, out typeBuilder);
|
|
|
|
var originalVariables = DynamicTools.DeclareLocalVariables(original, il);
|
|
var privateVars = new Dictionary<string, LocalBuilder>();
|
|
|
|
LocalBuilder resultVariable = null;
|
|
if (idx > 0)
|
|
{
|
|
resultVariable = DynamicTools.DeclareLocalVariable(il, AccessTools.GetReturnedType(original));
|
|
privateVars[RESULT_VAR] = resultVariable;
|
|
}
|
|
|
|
prefixes.ForEach(prefix =>
|
|
{
|
|
prefix.GetParameters()
|
|
.Where(patchParam => patchParam.Name == STATE_VAR)
|
|
.Do(patchParam =>
|
|
{
|
|
var privateStateVariable = DynamicTools.DeclareLocalVariable(il, patchParam.ParameterType);
|
|
privateVars[prefix.DeclaringType.FullName] = privateStateVariable;
|
|
});
|
|
});
|
|
|
|
var skipOriginalLabel = il.DefineLabel();
|
|
var canHaveJump = AddPrefixes(il, original, prefixes, privateVars, skipOriginalLabel);
|
|
|
|
var copier = new MethodCopier(original, il, originalVariables);
|
|
foreach (var transpiler in transpilers)
|
|
copier.AddTranspiler(transpiler);
|
|
|
|
var endLabels = new List<Label>();
|
|
var endBlocks = new List<ExceptionBlock>();
|
|
copier.Finalize(endLabels, endBlocks);
|
|
|
|
foreach (var label in endLabels)
|
|
Emitter.MarkLabel(il, label);
|
|
foreach (var block in endBlocks)
|
|
Emitter.MarkBlockAfter(il, block);
|
|
if (resultVariable != null)
|
|
Emitter.Emit(il, OpCodes.Stloc, resultVariable);
|
|
if (canHaveJump)
|
|
Emitter.MarkLabel(il, skipOriginalLabel);
|
|
|
|
AddPostfixes(il, original, postfixes, privateVars, false);
|
|
|
|
if (resultVariable != null)
|
|
Emitter.Emit(il, OpCodes.Ldloc, resultVariable);
|
|
|
|
AddPostfixes(il, original, postfixes, privateVars, true);
|
|
|
|
Emitter.Emit(il, OpCodes.Ret);
|
|
|
|
if (HarmonyInstance.DEBUG)
|
|
{
|
|
FileLog.LogBuffered("DONE");
|
|
FileLog.LogBuffered("");
|
|
FileLog.FlushBuffer();
|
|
}
|
|
|
|
// for debugging
|
|
if (DEBUG_METHOD_GENERATION_BY_DLL_CREATION)
|
|
{
|
|
DynamicTools.SaveMethod(assemblyBuilder, typeBuilder);
|
|
return null;
|
|
}
|
|
|
|
DynamicTools.PrepareDynamicMethod(patch);
|
|
return patch;
|
|
}
|
|
catch (Exception ex)
|
|
{
|
|
throw new Exception("Exception from HarmonyInstance \"" + harmonyInstanceID + "\"", ex);
|
|
}
|
|
finally
|
|
{
|
|
if (HarmonyInstance.DEBUG)
|
|
FileLog.FlushBuffer();
|
|
}
|
|
}
|
|
|
|
static OpCode LoadIndOpCodeFor(Type type)
|
|
{
|
|
if (type.IsEnum) return OpCodes.Ldind_I4;
|
|
|
|
if (type == typeof(float)) return OpCodes.Ldind_R4;
|
|
if (type == typeof(double)) return OpCodes.Ldind_R8;
|
|
|
|
if (type == typeof(byte)) return OpCodes.Ldind_U1;
|
|
if (type == typeof(ushort)) return OpCodes.Ldind_U2;
|
|
if (type == typeof(uint)) return OpCodes.Ldind_U4;
|
|
if (type == typeof(ulong)) return OpCodes.Ldind_I8;
|
|
|
|
if (type == typeof(sbyte)) return OpCodes.Ldind_I1;
|
|
if (type == typeof(short)) return OpCodes.Ldind_I2;
|
|
if (type == typeof(int)) return OpCodes.Ldind_I4;
|
|
if (type == typeof(long)) return OpCodes.Ldind_I8;
|
|
|
|
return OpCodes.Ldind_Ref;
|
|
}
|
|
|
|
static HarmonyArgument GetArgumentAttribute(this ParameterInfo parameter)
|
|
{
|
|
return parameter.GetCustomAttributes(false).FirstOrDefault(attr => attr is HarmonyArgument) as HarmonyArgument;
|
|
}
|
|
|
|
static HarmonyArgument[] GetArgumentAttributes(this MethodInfo method)
|
|
{
|
|
return method.GetCustomAttributes(false).Where(attr => attr is HarmonyArgument).Cast<HarmonyArgument>().ToArray();
|
|
}
|
|
|
|
static HarmonyArgument[] GetArgumentAttributes(this Type type)
|
|
{
|
|
return type.GetCustomAttributes(false).Where(attr => attr is HarmonyArgument).Cast<HarmonyArgument>().ToArray();
|
|
}
|
|
|
|
static string GetOriginalArgumentName(this ParameterInfo parameter, string[] originalParameterNames)
|
|
{
|
|
var attribute = parameter.GetArgumentAttribute();
|
|
if (attribute == null)
|
|
return null;
|
|
|
|
if (string.IsNullOrEmpty(attribute.OriginalName) == false)
|
|
return attribute.OriginalName;
|
|
|
|
if (attribute.Index >= 0 && attribute.Index < originalParameterNames.Length)
|
|
return originalParameterNames[attribute.Index];
|
|
|
|
return null;
|
|
}
|
|
|
|
static string GetOriginalArgumentName(HarmonyArgument[] attributes, string name, string[] originalParameterNames)
|
|
{
|
|
if (attributes.Length <= 0)
|
|
return null;
|
|
|
|
var attribute = attributes.SingleOrDefault(p => p.NewName == name);
|
|
if (attribute == null)
|
|
return null;
|
|
|
|
if (string.IsNullOrEmpty(attribute.OriginalName) == false)
|
|
return attribute.OriginalName;
|
|
|
|
if (attribute.Index >= 0 && attribute.Index < originalParameterNames.Length)
|
|
return originalParameterNames[attribute.Index];
|
|
|
|
return null;
|
|
}
|
|
|
|
static string GetOriginalArgumentName(this MethodInfo method, string[] originalParameterNames, string name)
|
|
{
|
|
string argumentName;
|
|
|
|
argumentName = GetOriginalArgumentName(method.GetArgumentAttributes(), name, originalParameterNames);
|
|
if (argumentName != null)
|
|
return argumentName;
|
|
|
|
argumentName = GetOriginalArgumentName(method.DeclaringType.GetArgumentAttributes(), name, originalParameterNames);
|
|
if (argumentName != null)
|
|
return argumentName;
|
|
|
|
return name;
|
|
}
|
|
|
|
private static int GetArgumentIndex(MethodInfo patch, string[] originalParameterNames, ParameterInfo patchParam)
|
|
{
|
|
var originalName = patchParam.GetOriginalArgumentName(originalParameterNames);
|
|
if (originalName != null)
|
|
return Array.IndexOf(originalParameterNames, originalName);
|
|
|
|
var patchParamName = patchParam.Name;
|
|
originalName = patch.GetOriginalArgumentName(originalParameterNames, patchParamName);
|
|
if (originalName != null)
|
|
return Array.IndexOf(originalParameterNames, originalName);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static MethodInfo getMethodMethod = typeof(MethodBase).GetMethod("GetMethodFromHandle", new[] { typeof(RuntimeMethodHandle) });
|
|
|
|
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 fieldName = patchParam.Name.Substring(INSTANCE_FIELD_PREFIX.Length);
|
|
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 bool AddPrefixes(ILGenerator il, MethodBase original, List<MethodInfo> prefixes, Dictionary<string, LocalBuilder> variables, Label label)
|
|
{
|
|
var canHaveJump = false;
|
|
prefixes.ForEach(fix =>
|
|
{
|
|
EmitCallParameter(il, original, fix, variables, false);
|
|
Emitter.Emit(il, OpCodes.Call, fix);
|
|
|
|
if (fix.ReturnType != typeof(void))
|
|
{
|
|
if (fix.ReturnType != typeof(bool))
|
|
throw new Exception("Prefix patch " + fix + " has not \"bool\" or \"void\" return type: " + fix.ReturnType);
|
|
Emitter.Emit(il, OpCodes.Brfalse, label);
|
|
canHaveJump = true;
|
|
}
|
|
});
|
|
return canHaveJump;
|
|
}
|
|
|
|
static void AddPostfixes(ILGenerator il, MethodBase original, List<MethodInfo> postfixes, Dictionary<string, LocalBuilder> variables, bool passthroughPatches)
|
|
{
|
|
postfixes
|
|
.Where(fix => passthroughPatches == (fix.ReturnType != typeof(void)))
|
|
.Do(fix =>
|
|
{
|
|
EmitCallParameter(il, original, fix, variables, true);
|
|
Emitter.Emit(il, OpCodes.Call, fix);
|
|
|
|
if (fix.ReturnType != typeof(void))
|
|
{
|
|
var firstFixParam = fix.GetParameters().FirstOrDefault();
|
|
var hasPassThroughResultParam = firstFixParam != null && fix.ReturnType == firstFixParam.ParameterType;
|
|
if (!hasPassThroughResultParam)
|
|
{
|
|
if (firstFixParam != null)
|
|
throw new Exception("Return type of postfix patch " + fix + " does match type of its first parameter");
|
|
|
|
throw new Exception("Postfix patch " + fix + " must have a \"void\" return type");
|
|
}
|
|
}
|
|
});
|
|
}
|
|
}
|
|
} |