private static void CreatePatchedMethod(ILContext il) {
ILCursor c = new ILCursor(il);
// The original method uses System.Reflection.Emit.
System.Type t_DynamicTools = GetHarmonyType("DynamicTools");
// Find and replace DynamicTools.CreateDynamicMethod
if (!c.TryGotoNext(i => i.MatchCall(t_DynamicTools, "CreateDynamicMethod"))) {
// Not the right method. Harmony defines two CreatePatchedMethod methods.
il.MakeReadOnly();
return;
}
c.Next.OpCode = OpCodes.Call;
c.Next.Operand = il.Import(typeof(HarmonyDetourBridge).GetMethod("CreateDMD", BindingFlags.NonPublic | BindingFlags.Static));
// Find the variable holding the "dynamic method" and update it.
int varDMDi = -1;
c.GotoNext(i => i.MatchStloc(out varDMDi));
VariableDefinition varDMD = il.Body.Variables[varDMDi];
varDMD.VariableType = il.Import(typeof(DynamicMethodDefinition));
// Find and replace patch.GetILGenerator
c.GotoNext(i => i.MatchCallvirt<System.Reflection.Emit.DynamicMethod>("GetILGenerator"));
c.Next.OpCode = OpCodes.Call;
c.Next.Operand = il.Import(typeof(DynamicMethodDefinition).GetMethod("GetILGenerator", BindingFlags.Public | BindingFlags.Instance));
// Find and remove DynamicTools.PrepareDynamicMethod
c.GotoNext(i => i.MatchCall(t_DynamicTools, "PrepareDynamicMethod"));
c.Next.OpCode = OpCodes.Pop;
c.Next.Operand = null;
// Go to the next ldloc that loads the DynamicMethod.
// No matter if it gets stored into a local variable or returned immediately,
// grab it, store it separately and push null as a replacement.
c.GotoNext(i => i.MatchLdloc(varDMDi));
c.Index++;
c.EmitDelegate<Func<DynamicMethodDefinition, System.Reflection.Emit.DynamicMethod>>(dmd => {
_LastWrapperDMD = dmd;
return null;
});
}
