void Run(CallInstruction inst, ILTransformContext context)
{
if (inst.Method.IsStatic)
{
return;
}
if (inst.Method.MetadataToken.IsNil || inst.Method.MetadataToken.Kind != HandleKind.MethodDefinition)
{
return;
}
var handle = (MethodDefinitionHandle)inst.Method.MetadataToken;
if (!IsDefinedInCurrentOrOuterClass(inst.Method, context.Function.Method.DeclaringTypeDefinition))
{
return;
}
if (!inst.Method.IsCompilerGeneratedOrIsInCompilerGeneratedClass())
{
return;
}
var metadata = context.PEFile.Metadata;
MethodDefinition methodDef = metadata.GetMethodDefinition((MethodDefinitionHandle)inst.Method.MetadataToken);
if (!methodDef.HasBody())
{
return;
}
// Use the callee's generic context
var genericContext = new GenericContext(inst.Method);
// partially copied from CSharpDecompiler
var ilReader = context.CreateILReader();
var body = context.PEFile.Reader.GetMethodBody(methodDef.RelativeVirtualAddress);
var proxyFunction = ilReader.ReadIL(handle, body, genericContext, ILFunctionKind.TopLevelFunction, context.CancellationToken);
var transformContext = new ILTransformContext(context, proxyFunction);
proxyFunction.RunTransforms(CSharp.CSharpDecompiler.EarlyILTransforms(), transformContext);
if (!(proxyFunction.Body is BlockContainer blockContainer))
{
return;
}
if (blockContainer.Blocks.Count != 1)
{
return;
}
var block = blockContainer.Blocks[0];
Call call;
ILInstruction returnValue;
switch (block.Instructions.Count)
{
case 1:
// leave IL_0000 (call Test(ldloc this, ldloc A_1))
if (!block.Instructions[0].MatchLeave(blockContainer, out returnValue))
{
return;
}
call = returnValue as Call;
break;
case 2:
// call Test(ldloc this, ldloc A_1)
// leave IL_0000(nop)
call = block.Instructions[0] as Call;
if (!block.Instructions[1].MatchLeave(blockContainer, out returnValue))
{
return;
}
if (!returnValue.MatchNop())
{
return;
}
break;
default:
return;
}
if (call == null || call.Method.IsConstructor)
{
return;
}
if (call.Method.IsStatic || call.Method.Parameters.Count != inst.Method.Parameters.Count)
{
return;
}
// check if original arguments are only correct ldloc calls
for (int i = 0; i < call.Arguments.Count; i++)
{
var originalArg = call.Arguments[i];
if (!originalArg.MatchLdLoc(out ILVariable var) ||
var.Kind != VariableKind.Parameter ||
var.Index != i - 1)
{
return;
}
}
context.Step("Replace proxy: " + inst.Method.Name + " with " + call.Method.Name, inst);
// Apply the wrapper call's substitution to the actual method call.
Call newInst = new Call(call.Method.Specialize(inst.Method.Substitution));
// copy flags
newInst.ConstrainedTo = call.ConstrainedTo;
newInst.ILStackWasEmpty = inst.ILStackWasEmpty;
newInst.IsTail = call.IsTail & inst.IsTail;
// copy IL ranges
newInst.AddILRange(inst);
newInst.Arguments.ReplaceList(inst.Arguments);
inst.ReplaceWith(newInst);
}
