/// <summary>Returns the methods unmodified list of CodeInstructions</summary>
/// <param name="original">The original method</param>
/// <param name="generator">The generator that now contains all local variables and labels contained in the result</param>
/// <returns>A list containing all the original CodeInstructions</returns>
public static List <CodeInstruction> GetOriginalInstructions(MethodBase original, out ILGenerator generator)
{
var patch = DynamicTools.CreateDynamicMethod(original, $"_Copy{Guid.NewGuid()}");
generator = patch.GetILGenerator();
var reader = MethodBodyReader.GetInstructions(generator, original);
return(reader.Select(ins => ins.GetCodeInstruction()).ToList());
}
public static DynamicMethod CreatePatchedMethod(MethodBase original, MethodBase source, string harmonyInstanceID, List <MethodInfo> prefixes, List <MethodInfo> postfixes, List <MethodInfo> transpilers, List <MethodInfo> finalizers)
{
try
{
if (original == null)
{
throw new ArgumentNullException(nameof(original));
}
Memory.MarkForNoInlining(original);
if (Harmony.DEBUG)
{
FileLog.LogBuffered("### Patch " + original.FullDescription());
FileLog.FlushBuffer();
}
var idx = prefixes.Count() + postfixes.Count() + finalizers.Count();
var firstArgIsReturnBuffer = NativeThisPointer.NeedsNativeThisPointerFix(original);
var returnType = AccessTools.GetReturnedType(original);
var hasFinalizers = finalizers.Any();
var patch = DynamicTools.CreateDynamicMethod(original, "_Patch" + idx);
if (patch == null)
{
return(null);
}
var il = patch.GetILGenerator();
var originalVariables = DynamicTools.DeclareLocalVariables(source ?? original, il);
var privateVars = new Dictionary <string, LocalBuilder>();
LocalBuilder resultVariable = null;
if (idx > 0)
{
resultVariable = DynamicTools.DeclareLocalVariable(il, returnType);
privateVars[RESULT_VAR] = resultVariable;
}
prefixes.Union(postfixes).Union(finalizers).ToList().ForEach(fix =>
{
if (privateVars.ContainsKey(fix.DeclaringType?.FullName ?? "") == false)
{
fix.GetParameters()
.Where(patchParam => patchParam.Name == STATE_VAR)
.Do(patchParam =>
{
var privateStateVariable = DynamicTools.DeclareLocalVariable(il, patchParam.ParameterType);
privateVars[fix.DeclaringType?.FullName ?? ""] = privateStateVariable;
});
}
});
LocalBuilder finalizedVariable = null;
if (hasFinalizers)
{
finalizedVariable = DynamicTools.DeclareLocalVariable(il, typeof(bool));
privateVars[EXCEPTION_VAR] = DynamicTools.DeclareLocalVariable(il, typeof(Exception));
// begin try
Emitter.MarkBlockBefore(il, new ExceptionBlock(ExceptionBlockType.BeginExceptionBlock), out _);
}
if (firstArgIsReturnBuffer)
{
Emitter.Emit(il, OpCodes.Ldarg_1); // load ref to return value
}
var skipOriginalLabel = il.DefineLabel();
var canHaveJump = AddPrefixes(il, original, prefixes, privateVars, skipOriginalLabel);
var copier = new MethodCopier(source ?? original, il, originalVariables);
foreach (var transpiler in transpilers)
{
copier.AddTranspiler(transpiler);
}
if (firstArgIsReturnBuffer)
{
copier.AddTranspiler(NativeThisPointer.m_ArgumentShiftTranspiler);
}
var endLabels = new List <Label>();
copier.Finalize(endLabels);
foreach (var label in endLabels)
{
Emitter.MarkLabel(il, label);
}
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);
if (hasFinalizers)
{
AddFinalizers(il, original, finalizers, privateVars, false);
Emitter.Emit(il, OpCodes.Ldc_I4_1);
Emitter.Emit(il, OpCodes.Stloc, finalizedVariable);
var noExceptionLabel1 = il.DefineLabel();
Emitter.Emit(il, OpCodes.Ldloc, privateVars[EXCEPTION_VAR]);
Emitter.Emit(il, OpCodes.Brfalse, noExceptionLabel1);
Emitter.Emit(il, OpCodes.Ldloc, privateVars[EXCEPTION_VAR]);
Emitter.Emit(il, OpCodes.Throw);
Emitter.MarkLabel(il, noExceptionLabel1);
// end try, begin catch
Emitter.MarkBlockBefore(il, new ExceptionBlock(ExceptionBlockType.BeginCatchBlock), out var label);
Emitter.Emit(il, OpCodes.Stloc, privateVars[EXCEPTION_VAR]);
Emitter.Emit(il, OpCodes.Ldloc, finalizedVariable);
var endFinalizerLabel = il.DefineLabel();
Emitter.Emit(il, OpCodes.Brtrue, endFinalizerLabel);
var rethrowPossible = AddFinalizers(il, original, finalizers, privateVars, true);
Emitter.MarkLabel(il, endFinalizerLabel);
var noExceptionLabel2 = il.DefineLabel();
Emitter.Emit(il, OpCodes.Ldloc, privateVars[EXCEPTION_VAR]);
Emitter.Emit(il, OpCodes.Brfalse, noExceptionLabel2);
if (rethrowPossible)
{
Emitter.Emit(il, OpCodes.Rethrow);
}
else
{
Emitter.Emit(il, OpCodes.Ldloc, privateVars[EXCEPTION_VAR]);
Emitter.Emit(il, OpCodes.Throw);
}
Emitter.MarkLabel(il, noExceptionLabel2);
// end catch
Emitter.MarkBlockAfter(il, new ExceptionBlock(ExceptionBlockType.EndExceptionBlock));
if (resultVariable != null)
{
Emitter.Emit(il, OpCodes.Ldloc, resultVariable);
}
}
if (firstArgIsReturnBuffer)
{
Emitter.Emit(il, OpCodes.Stobj, returnType); // store result into ref
}
Emitter.Emit(il, OpCodes.Ret);
if (Harmony.DEBUG)
{
FileLog.LogBuffered("DONE");
FileLog.LogBuffered("");
FileLog.FlushBuffer();
}
DynamicTools.PrepareDynamicMethod(patch);
return(patch);
}
catch (Exception ex)
{
var exceptionString = "Exception from HarmonyInstance \"" + harmonyInstanceID + "\" patching " + original.FullDescription() + ": " + ex;
if (Harmony.DEBUG)
{
var savedIndentLevel = FileLog.indentLevel;
FileLog.indentLevel = 0;
FileLog.Log(exceptionString);
FileLog.indentLevel = savedIndentLevel;
}
throw new Exception(exceptionString, ex);
}
finally
{
if (Harmony.DEBUG)
{
FileLog.FlushBuffer();
}
}
}