C# CppCodeGen.CppGenerationBuffer类代码示例

        public void CompileMethod(CppMethodCodeNode methodCodeNodeNeedingCode)
        {
            MethodDesc method = methodCodeNodeNeedingCode.Method;

            _compilation.Log.WriteLine("Compiling " + method.ToString());

            if (method.HasCustomAttribute("System.Runtime", "RuntimeImportAttribute"))
            {
                CompileExternMethod(methodCodeNodeNeedingCode, ((EcmaMethod)method).GetRuntimeImportName());
                return;
            }

            if (method.IsRawPInvoke())
            {
                CompileExternMethod(methodCodeNodeNeedingCode, method.GetPInvokeMethodMetadata().Name ?? method.Name);
                return;
            }

            var methodIL = _compilation.GetMethodIL(method);
            if (methodIL == null)
                return;

            try
            {
                var ilImporter = new ILImporter(_compilation, this, method, methodIL);

                CompilerTypeSystemContext typeSystemContext = _compilation.TypeSystemContext;

                MethodDebugInformation debugInfo = _compilation.GetDebugInfo(methodIL);

                if (!_compilation.Options.NoLineNumbers)
                {
                    IEnumerable<ILSequencePoint> sequencePoints = debugInfo.GetSequencePoints();
                    if (sequencePoints != null)
                        ilImporter.SetSequencePoints(sequencePoints);
                }

                IEnumerable<ILLocalVariable> localVariables = debugInfo.GetLocalVariables();
                if (localVariables != null)
                    ilImporter.SetLocalVariables(localVariables);

                IEnumerable<string> parameters = GetParameterNamesForMethod(method);
                if (parameters != null)
                    ilImporter.SetParameterNames(parameters);

                ilImporter.Compile(methodCodeNodeNeedingCode);
            }
            catch (Exception e)
            {
                _compilation.Log.WriteLine(e.Message + " (" + method + ")");

                var builder = new CppGenerationBuffer();
                builder.AppendLine();
                builder.Append(GetCppMethodDeclaration(method, true));
                builder.AppendLine();
                builder.Append("{");
                builder.Indent();
                builder.AppendLine();
                builder.Append("throw 0xC000C000;");
                builder.Exdent();
                builder.AppendLine();
                builder.Append("}");

                methodCodeNodeNeedingCode.SetCode(builder.ToString(), Array.Empty<Object>());
            }
        }

        private String GetCodeForReloc(Relocation reloc, DependencyNode node, NodeFactory factory)
        {
            CppGenerationBuffer relocCode = new CppGenerationBuffer();
            if (reloc.Target is CppMethodCodeNode)
            {
                var method = reloc.Target as CppMethodCodeNode;

                relocCode.Append("(void*)&");
                relocCode.Append(GetCppMethodDeclarationName(method.Method.OwningType, GetCppMethodName(method.Method)));
            }
            else if (reloc.Target is EETypeNode && node is EETypeNode)
            {
                relocCode.Append(GetCppMethodDeclarationName((reloc.Target as EETypeNode).Type, "__getMethodTable"));
                relocCode.Append("()");
            }
            // Node is either an non-emitted type or a generic composition - both are ignored for CPP codegen
            else if ((reloc.Target is TypeManagerIndirectionNode || reloc.Target is InterfaceDispatchMapNode || reloc.Target is EETypeOptionalFieldsNode || reloc.Target is GenericCompositionNode) && !(reloc.Target as ObjectNode).ShouldSkipEmittingObjectNode(factory))
            {
                string mangledTargetName = reloc.Target.GetMangledName();
                bool shouldReplaceNamespaceQualifier = reloc.Target is GenericCompositionNode || reloc.Target is EETypeOptionalFieldsNode;
                relocCode.Append(shouldReplaceNamespaceQualifier ? mangledTargetName.Replace("::", "_") : mangledTargetName);
                relocCode.Append("()");
            }
            else if (reloc.Target is ObjectAndOffsetSymbolNode &&
                (reloc.Target as ObjectAndOffsetSymbolNode).Target is ArrayOfEmbeddedPointersNode<InterfaceDispatchMapNode>)
            {
                relocCode.Append("dispatchMapModule");
            }
            else
            {
                relocCode.Append("NULL");
            }
            return relocCode.ToString();
        }

 private static void AppendFormattedByteArray(CppGenerationBuffer sb, byte[] array, int startIndex, int endIndex)
 {
     sb.Append("{");
     sb.Append("0x");
     sb.Append(BitConverter.ToString(array, startIndex, endIndex - startIndex).Replace("-", ",0x"));
     sb.Append("}");
 }

        private String GetCodeForDelegate(TypeDesc delegateType)
        {
            var sb = new CppGenerationBuffer();

            MethodDesc method = delegateType.GetKnownMethod("Invoke", null);

            AppendSlotTypeDef(sb, method);

            sb.AppendLine();
            sb.Append("static __slot__");
            sb.Append(GetCppMethodName(method));
            sb.Append(" __invoke__");
            sb.Append(GetCppMethodName(method));
            sb.Append("(void * pThis)");
            sb.AppendLine();
            sb.Append("{");
            sb.Indent();
            sb.AppendLine();
            sb.Append("return (__slot__");
            sb.Append(GetCppMethodName(method));
            sb.Append(")(((");
            sb.Append(GetCppSignatureTypeName(_compilation.TypeSystemContext.GetWellKnownType(WellKnownType.MulticastDelegate)));
            sb.Append(")pThis)->m_functionPointer);");
            sb.Exdent();
            sb.AppendLine();
            sb.Append("};");

            return sb.ToString();
        }

        private String GetCodeForObjectNode(ObjectNode node, NodeFactory factory)
        {
            // virtual slots
            var nodeData = node.GetData(factory, false);

            CppGenerationBuffer nodeCode = new CppGenerationBuffer();

            /* Create list of byte data. Used to divide contents between reloc and byte data
          * First val - isReloc
          * Second val - size of byte data if first value of tuple is false
          */

            List<NodeDataSection> nodeDataSections = new List<NodeDataSection>();
            byte[] actualData = new byte[nodeData.Data.Length];
            Relocation[] relocs = nodeData.Relocs;

            int nextRelocOffset = -1;
            int nextRelocIndex = -1;
            int lastByteIndex = 0;

            if (relocs.Length > 0)
            {
                nextRelocOffset = relocs[0].Offset;
                nextRelocIndex = 0;
            }

            int i = 0;
            int offset = 0;
            CppGenerationBuffer nodeDataDecl = new CppGenerationBuffer();

            if (node is ISymbolNode)
            {
                offset = (node as ISymbolNode).Offset;
                i = offset;
                lastByteIndex = offset;
            }
            while (i < nodeData.Data.Length)
            {
                if (i == nextRelocOffset)
                {
                    Relocation reloc = relocs[nextRelocIndex];

                    int size = _compilation.TypeSystemContext.Target.PointerSize;
                    // Make sure we've gotten the correct size for the reloc
                    System.Diagnostics.Debug.Assert(reloc.RelocType == (size == 8 ? RelocType.IMAGE_REL_BASED_DIR64 : RelocType.IMAGE_REL_BASED_HIGHLOW));

                    // Update nextRelocIndex/Offset
                    if (++nextRelocIndex < relocs.Length)
                    {
                        nextRelocOffset = relocs[nextRelocIndex].Offset;
                    }
                    nodeDataSections.Add(new NodeDataSection(NodeDataSectionType.Relocation, size));
                    i += size;
                    lastByteIndex = i;
                }
                else
                {
                    i++;
                    if (i + 1 == nextRelocOffset || i + 1 == nodeData.Data.Length)
                    {
                        nodeDataSections.Add(new NodeDataSection(NodeDataSectionType.ByteData, (i + 1) - lastByteIndex));
                    }
                }
            }
            string pointerType = node is EETypeNode ? "MethodTable * " : "void* ";
            nodeCode.Append(pointerType);
            if (node is EETypeNode)
            {
                nodeCode.Append(GetCppMethodDeclarationName((node as EETypeNode).Type, "__getMethodTable"));
            }
            else
            {
                string mangledName = ((ISymbolNode)node).GetMangledName();

                // Rename generic composition and optional fields nodes to avoid name clash with types
                bool shouldReplaceNamespaceQualifier = node is GenericCompositionNode || node is EETypeOptionalFieldsNode;
                nodeCode.Append(shouldReplaceNamespaceQualifier ? mangledName.Replace("::", "_") : mangledName);
            }
            nodeCode.Append("()");
            nodeCode.AppendLine();
            nodeCode.Append("{");
            nodeCode.Indent();
            nodeCode.AppendLine();
            nodeCode.Append("static struct {");

            nodeCode.AppendLine();
            nodeCode.Append(GetCodeForNodeStruct(nodeDataSections, node));

            nodeCode.AppendLine();
            nodeCode.Append("} mt = {");
            nodeCode.Append(GetCodeForNodeData(nodeDataSections, relocs, nodeData.Data, node, offset, factory));

            nodeCode.Append("};");
            nodeCode.AppendLine();
            nodeCode.Append("return ( ");
            nodeCode.Append(pointerType);
            nodeCode.Append(")&mt;");
            nodeCode.Exdent();
            nodeCode.AppendLine();
            nodeCode.Append("}");
//.........这里部分代码省略.........

        public void CompileMethod(CppMethodCodeNode methodCodeNodeNeedingCode)
        {
            MethodDesc method = methodCodeNodeNeedingCode.Method;

            _compilation.Logger.Writer.WriteLine("Compiling " + method.ToString());
            if (method.HasCustomAttribute("System.Runtime", "RuntimeImportAttribute"))
            {
                CompileExternMethod(methodCodeNodeNeedingCode, ((EcmaMethod)method).GetRuntimeImportName());
                return;
            }

            if (method.IsRawPInvoke())
            {
                CompileExternMethod(methodCodeNodeNeedingCode, method.GetPInvokeMethodMetadata().Name ?? method.Name);
                return;
            }

            var methodIL = _compilation.GetMethodIL(method);
            if (methodIL == null)
                return;

            // TODO: Remove this code once CppCodegen is able to generate code for the reflection startup path.
            //       The startup path runs before any user code is executed.
            //       For now we replace the startup path with a simple "ret". Reflection won't work, but
            //       programs not using reflection will.
            if (method.Name == ".cctor")
            {
                MetadataType owningType = method.OwningType as MetadataType;
                if (owningType != null &&
                    owningType.Name == "ReflectionExecution" && owningType.Namespace == "Internal.Reflection.Execution")
                {
                    methodIL = new Internal.IL.Stubs.ILStubMethodIL(method, new byte[] { (byte)ILOpcode.ret }, Array.Empty<LocalVariableDefinition>(), null);
                }
            }

            try
            {
                // TODO: hacky special-case
                if (method.Name == "_ecvt_s")
                    throw new NotImplementedException();

                var ilImporter = new ILImporter(_compilation, this, method, methodIL);

                CompilerTypeSystemContext typeSystemContext = _compilation.TypeSystemContext;

                MethodDebugInformation debugInfo = _compilation.GetDebugInfo(methodIL);

                if (!_compilation.Options.HasOption(CppCodegenConfigProvider.NoLineNumbersString))
                {
                    IEnumerable<ILSequencePoint> sequencePoints = debugInfo.GetSequencePoints();
                    if (sequencePoints != null)
                        ilImporter.SetSequencePoints(sequencePoints);
                }

                IEnumerable<ILLocalVariable> localVariables = debugInfo.GetLocalVariables();
                if (localVariables != null)
                    ilImporter.SetLocalVariables(localVariables);

                IEnumerable<string> parameters = GetParameterNamesForMethod(method);
                if (parameters != null)
                    ilImporter.SetParameterNames(parameters);

                ilImporter.Compile(methodCodeNodeNeedingCode);
            }
            catch (Exception e)
            {
                _compilation.Logger.Writer.WriteLine(e.Message + " (" + method + ")");

                var sb = new CppGenerationBuffer();
                sb.AppendLine();
                AppendCppMethodDeclaration(sb, method, true);
                sb.AppendLine();
                sb.Append("{");
                sb.Indent();
                sb.AppendLine();
                sb.Append("throw 0xC000C000;");
                sb.Exdent();
                sb.AppendLine();
                sb.Append("}");

                methodCodeNodeNeedingCode.SetCode(sb.ToString(), Array.Empty<Object>());
            }
        }

        private void AppendSlotTypeDef(CppGenerationBuffer sb, MethodDesc method)
        {
            MethodSignature methodSignature = method.Signature;

            TypeDesc thisArgument = null;
            if (!methodSignature.IsStatic)
                thisArgument = method.OwningType;

            AppendSignatureTypeDef(sb, "__slot__" + GetCppMethodName(method), methodSignature, thisArgument);
        }

//.........这里部分代码省略.........
                    if (retType.IsPointer)
                    {
                        Append("(intptr_t)");
                    }
                }
            }
            else
            {
                needNewLine = true;
            }
            AddTypeReference(method.OwningType, true);

            if (opcode == ILOpcode.newobj)
            {
                if (!retType.IsValueType)
                {
                    // We do not reset needNewLine since we still need for the next statement.
                    if (needNewLine)
                        AppendLine();
                    Append("__allocate_object(");
                    Append(_writer.GetCppTypeName(retType));
                    Append("::__getMethodTable())");
                    AppendSemicolon();
                    needNewLine = true;

                    if (delegateInfo != null && delegateInfo.Thunk != null)
                    {
                        MethodDesc thunkMethod = delegateInfo.Thunk.Method;
                        AddMethodReference(thunkMethod);

                        // Update stack with new name.
                        ((ExpressionEntry)_stack[_stack.Top - 2]).Name = temp;

                        var sb = new CppGenerationBuffer();
                        AppendLine();
                        sb.Append("(intptr_t)&");
                        sb.Append(_writer.GetCppTypeName(thunkMethod.OwningType));
                        sb.Append("::");
                        sb.Append(_writer.GetCppMethodName(thunkMethod));

                        PushExpression(StackValueKind.NativeInt, sb.ToString());
                    }
                }
            }

            if (needNewLine)
                AppendLine();

            if (callViaSlot || delegateInvoke)
            {
                ExpressionEntry v = (ExpressionEntry)_stack[_stack.Top - (methodSignature.Length + 1)];
                Append("(*");
                Append(_writer.GetCppTypeName(method.OwningType));
                Append("::");
                Append(delegateInvoke ? "__invoke__" : "__getslot__");
                Append(_writer.GetCppMethodName(method));
                Append("(");
                Append(v);
                Append("))");

                if (delegateInvoke)
                {
                    v.Name =
                        "((" + _writer.GetCppSignatureTypeName(GetWellKnownType(WellKnownType.MulticastDelegate)) + ")" +
                            v.Name + ")->m_firstParameter";
                }

        private void ImportLoadString(int token)
        {
            string str = (string)_methodIL.GetObject(token);

            PushTemp(StackValueKind.ObjRef, GetWellKnownType(WellKnownType.String));

            var escaped = new CppGenerationBuffer();
            foreach (char c in str)
            {
                switch (c)
                {
                    case '\\':
                        escaped.Append("\\\\");
                        break;
                    case '\r':
                        escaped.Append("\\r");
                        break;
                    case '\n':
                        escaped.Append("\\n");
                        break;
                    case '\t':
                        escaped.Append("\\t");
                        break;
                    default:
                        // TODO: handle all characters < 32
                        escaped.Append(c);
                        break;
                }
            }

            Append("__load_string_literal(\"");
            Append(escaped.ToString());
            Append("\")");
            AppendSemicolon();
        }

        private void AppendVirtualSlots(CppGenerationBuffer sb, TypeDesc implType, TypeDesc declType)
        {
            var baseType = declType.BaseType;
            if (baseType != null)
                AppendVirtualSlots(sb, implType, baseType);

            IReadOnlyList<MethodDesc> virtualSlots = _compilation.NodeFactory.VTable(declType).Slots;
            for (int i = 0; i < virtualSlots.Count; i++)
            {
                MethodDesc declMethod = virtualSlots[i];
                MethodDesc implMethod = implType.GetClosestMetadataType().FindVirtualFunctionTargetMethodOnObjectType(declMethod);

                sb.AppendLine();
                if (implMethod.IsAbstract)
                {
                    sb.Append("NULL,");
                }
                else
                {
                    sb.Append("(void*)&");
                    sb.Append(GetCppMethodDeclarationName(implMethod.OwningType, GetCppMethodName(implMethod)));
                    sb.Append(",");
                }
            }
        }

        private String GetCodeForType(TypeDesc type)
        {
            var sb = new CppGenerationBuffer();

            int totalSlots = 0;

            TypeDesc t = type;
            while (t != null)
            {
                IReadOnlyList<MethodDesc> virtualSlots = _compilation.NodeFactory.VTable(t).Slots;
                totalSlots += virtualSlots.Count;
                t = t.BaseType;
            }

            UInt16 flags = 0;
            try
            {
                flags = EETypeBuilderHelpers.ComputeFlags(type);
            }
            catch
            {
                // TODO: Handling of missing dependencies
                flags = 0;
            }

            sb.Append("MethodTable * ");
            sb.Append(GetCppMethodDeclarationName(type, "__getMethodTable"));
            sb.Append("()");
            sb.AppendLine();
            sb.Append("{");
            sb.Indent();

            sb.AppendLine();
            sb.Append("static struct {");
            sb.Indent();
            // sb.Append(GCDesc);
            sb.AppendLine();
            sb.Append("RawEEType EEType;");
            if (totalSlots != 0)
            {
                sb.AppendLine();
                sb.Append("void * slots[");
                sb.Append(totalSlots);
                sb.Append("];");
            }
            sb.Exdent();
            sb.AppendLine();
            sb.Append("} mt = {");
            sb.Indent();
            // gcdesc
            if (type.IsString)
            {
                // String has non-standard layout
                sb.AppendLine();
                sb.Append("{");
                sb.Indent();
                sb.AppendLine();
                sb.Append("sizeof(uint16_t),");
                sb.AppendLine();
                sb.Append("0x");                             // EEType::_usComponentSize
                sb.Append(flags.ToStringInvariant("x4"));  // EEType::_usFlags
                sb.Append(",");
                sb.AppendLine();
                sb.Append("2 * sizeof(void*) + sizeof(int32_t) + 2,");       // EEType::_uBaseSize
            }
            else
            if (type.IsSzArray)
            {
                sb.AppendLine();
                sb.Append("{");
                sb.Indent();
                sb.AppendLine();
                sb.Append("sizeof(");
                sb.Append(GetCppSignatureTypeName(((ArrayType)type).ElementType)); // EEType::_usComponentSize
                sb.Append("),");
                sb.AppendLine();
                sb.Append("0x");
                sb.Append(flags.ToStringInvariant("x4"));  // EEType::_usFlags
                sb.Append(",");
                sb.AppendLine();
                sb.Append("3 * sizeof(void*),"); // EEType::_uBaseSize
            }
            else
            if (type.IsArray)
            {
                sb.AppendLine();
                sb.Append("{");
                sb.Indent();
                sb.AppendLine();
                sb.Append("sizeof(");
                sb.Append(GetCppSignatureTypeName(((ArrayType)type).ElementType)); // EEType::_usComponentSize
                sb.Append("),");
                sb.AppendLine();
                sb.Append("0x");
                sb.Append(flags.ToStringInvariant("x4"));  // EEType::_usFlags
                sb.Append(",");
                sb.AppendLine();
                sb.Append("3 * sizeof(void*) + ");                            // EEType::_uBaseSize
                sb.Append(((ArrayType)type).Rank.ToStringInvariant());
                sb.Append("* sizeof(int32_t) * 2,");
//.........这里部分代码省略.........

 private void OutputMethod(CppGenerationBuffer sb, MethodDesc m)
 {
     sb.AppendLine();
     sb.Append(GetCppMethodDeclaration(m, false));
 }

        private void OutputType(CppGenerationBuffer sb, TypeDesc t, bool full)
        {
            _emittedTypes.Add(t);

            if (full)
            {
                if (!t.IsValueType)
                {
                    var baseType = t.BaseType;
                    if (baseType != null)
                    {
                        if (!_emittedTypes.Contains(baseType))
                        {
                            OutputType(sb, baseType, full);
                        }
                    }
                }

                foreach (var field in t.GetFields())
                {
                    var fieldType = GetFieldTypeOrPlaceholder(field);
                    if (fieldType.IsValueType && !fieldType.IsPrimitive && !field.IsStatic)
                    {
                        if (!_emittedTypes.Contains(fieldType))
                        {
                            OutputType(sb, fieldType, full);
                        }
                    }
                }
            }

            string mangledName = GetCppTypeName(t);

            int nesting = 0;
            int current = 0;
            // Create Namespaces. If a mangledName starts with just :: we will simply ignore it.
            sb.AppendLine();
            for (;;)
            {
                int sep = mangledName.IndexOf("::", current);
                if (sep < 0)
                    break;

                if (sep != 0)
                {
                    // Case of a name not starting with ::
                    sb.Append("namespace " + mangledName.Substring(current, sep - current) + " { ");
                    nesting++;
                }
                current = sep + 2;

            }

            if (full)
            {
                sb.Append("class " + mangledName.Substring(current));
                if (!t.IsValueType)
                {
                    if (t.BaseType != null)
                    {
                        sb.Append(" : public " + GetCppTypeName(t.BaseType));
                    }
                }
                sb.Append(" {");
                sb.AppendLine();
                sb.Append("public:");
                sb.Indent();

                // TODO: Enable once the dependencies are tracked for arrays
                // if (((DependencyNode)_compilation.NodeFactory.ConstructedTypeSymbol(t)).Marked)
                if (!t.IsPointer && !t.IsByRef)
                {
                    sb.AppendLine();
                    sb.Append("static MethodTable * __getMethodTable();");
                }

                IReadOnlyList<MethodDesc> virtualSlots = _compilation.NodeFactory.VTable(t).Slots;
                
                int baseSlots = 0;
                var baseType = t.BaseType;
                while (baseType != null)
                {
                    IReadOnlyList<MethodDesc> baseVirtualSlots = _compilation.NodeFactory.VTable(baseType).Slots;
                    if (baseVirtualSlots != null)
                        baseSlots += baseVirtualSlots.Count;
                    baseType = baseType.BaseType;
                }

                for (int slot = 0; slot < virtualSlots.Count; slot++)
                {
                    MethodDesc virtualMethod = virtualSlots[slot];
                    sb.AppendLine();
                    sb.Append(GetCodeForVirtualMethod(virtualMethod, baseSlots + slot));
                }

                if (t.IsDelegate)
                {
                    sb.AppendLine();
                    sb.Append(GetCodeForDelegate(t));
                }
//.........这里部分代码省略.........

        private void OutputTypes(bool full)
        {
            var sb = new CppGenerationBuffer();
            if (full)
            {
                _statics = new CppGenerationBuffer();
                _statics.Indent();
                _gcStatics = new CppGenerationBuffer();
                _gcStatics.Indent();
                _threadStatics = new CppGenerationBuffer();
                _threadStatics.Indent();
                _gcThreadStatics = new CppGenerationBuffer();
                _gcThreadStatics.Indent();
            }

            _emittedTypes = new HashSet<TypeDesc>();
            foreach (var t in _cppSignatureNames.Keys)
            {
                if (t.IsByRef || t.IsPointer)
                    continue;

                // Base class types and valuetype instantance field types may be emitted out-of-order to make them 
                // appear before they are used.
                if (_emittedTypes.Contains(t))
                    continue;

                OutputType(sb, t, full);
            }
            _emittedTypes = null;

            if (full)
            {
                sb.AppendLine();
                sb.Append("struct {");
                // No need to indent or add a new line as _statics is already properly indented
                sb.Append(_statics.ToString());
                sb.AppendLine();
                sb.Append("} __statics;");

                // TODO: Register GC statics with GC
                sb.AppendLine();
                sb.Append("struct {");
                // No need to indent or add a new line as _gcStatics is already properly indented
                sb.Append(_gcStatics.ToString());
                sb.AppendLine();
                sb.Append("} __gcStatics;");

                sb.AppendLine();

                _statics = null;
                _gcStatics = null;
                _threadStatics = null;
                _gcThreadStatics = null;
            }

            Out.Write(sb.ToString());
            sb.Clear();
        }

        public void AppendCppMethodCallParamList(CppGenerationBuffer sb, MethodDesc method)
        {
            var methodSignature = method.Signature;

            bool hasThis = !methodSignature.IsStatic;
            int argCount = methodSignature.Length;
            if (hasThis)
                argCount++;

            List<string> parameterNames = null;
            IEnumerable<string> parameters = GetParameterNamesForMethod(method);
            if (parameters != null)
            {
                parameterNames = new List<string>(parameters);
                if (parameterNames.Count != 0)
                {
                    System.Diagnostics.Debug.Assert(parameterNames.Count == argCount);
                }
                else
                {
                    parameterNames = null;
                }
            }

            for (int i = 0; i < argCount; i++)
            {
                if (parameterNames != null)
                {
                    sb.Append(SanitizeCppVarName(parameterNames[i]));
                }
                else
                {
                    sb.Append("_a");
                    sb.Append(i.ToStringInvariant());
                }
                if (i != argCount - 1)
                    sb.Append(", ");
            }
        }