Esempio n. 1
0
        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;
            }
            var genericContext = DelegateConstruction.GenericContextFromTypeArguments(inst.Method.Substitution);

            if (genericContext == null)
            {
                return;
            }
            // partially copied from CSharpDecompiler
            var ilReader         = context.CreateILReader();
            var body             = context.PEFile.Reader.GetMethodBody(methodDef.RelativeVirtualAddress);
            var proxyFunction    = ilReader.ReadIL(handle, body, genericContext.Value, 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);
            Call newInst = (Call)call.Clone();

            newInst.Arguments.ReplaceList(inst.Arguments);
            inst.ReplaceWith(newInst);
        }