예제 #1
0
        public override void AttachToDependencyGraph(DependencyAnalyzerBase <NodeFactory> graph)
        {
            Header = new HeaderNode(Target);

            var compilerIdentifierNode = new CompilerIdentifierNode(Target);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.CompilerIdentifier, compilerIdentifierNode, compilerIdentifierNode);

            RuntimeFunctionsTable = new RuntimeFunctionsTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.RuntimeFunctions, RuntimeFunctionsTable, RuntimeFunctionsTable);

            RuntimeFunctionsGCInfo = new RuntimeFunctionsGCInfoNode();
            graph.AddRoot(RuntimeFunctionsGCInfo, "GC info is always generated");

            ProfileDataSection = new ProfileDataSectionNode();
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ProfileDataInfo, ProfileDataSection, ProfileDataSection.StartSymbol);

            ExceptionInfoLookupTableNode exceptionInfoLookupTableNode = new ExceptionInfoLookupTableNode(this);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.ExceptionInfo, exceptionInfoLookupTableNode, exceptionInfoLookupTableNode);
            graph.AddRoot(exceptionInfoLookupTableNode, "ExceptionInfoLookupTable is always generated");

            MethodEntryPointTable = new MethodEntryPointTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.MethodDefEntryPoints, MethodEntryPointTable, MethodEntryPointTable);

            ManifestMetadataTable = new ManifestMetadataTableNode(InputModuleContext.GlobalContext);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ManifestMetadata, ManifestMetadataTable, ManifestMetadataTable);

            Resolver.SetModuleIndexLookup(ManifestMetadataTable.ModuleToIndex);

            InstanceEntryPointTable = new InstanceEntryPointTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.InstanceMethodEntryPoints, InstanceEntryPointTable, InstanceEntryPointTable);

            TypesTable = new TypesTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.AvailableTypes, TypesTable, TypesTable);

            ImportSectionsTable = new ImportSectionsTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ImportSections, ImportSectionsTable, ImportSectionsTable.StartSymbol);

            DebugInfoTable = new DebugInfoTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.DebugInfo, DebugInfoTable, DebugInfoTable);

            // Core library attributes are checked FAR more often than other dlls
            // attributes, so produce a highly efficient table for determining if they are
            // present. Other assemblies *MAY* benefit from this feature, but it doesn't show
            // as useful at this time.
            if (this.AttributePresenceFilter != null)
            {
                Header.Add(Internal.Runtime.ReadyToRunSectionType.AttributePresence, AttributePresenceFilter, AttributePresenceFilter);
            }

            EagerImports = new ImportSectionNode(
                "EagerImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_EAGER,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(EagerImports);

            // All ready-to-run images have a module import helper which gets patched by the runtime on image load
            ModuleImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                          ILCompiler.ReadyToRunHelper.Module));
            graph.AddRoot(ModuleImport, "Module import is required by the R2R format spec");

            if (Target.Architecture != TargetArchitecture.X86)
            {
                Import personalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                 ILCompiler.ReadyToRunHelper.PersonalityRoutine));
                PersonalityRoutine = new ImportThunk(
                    ILCompiler.ReadyToRunHelper.PersonalityRoutine, this, personalityRoutineImport, useVirtualCall: false);
                graph.AddRoot(PersonalityRoutine, "Personality routine is faster to root early rather than referencing it from each unwind info");

                Import filterFuncletPersonalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                              ILCompiler.ReadyToRunHelper.PersonalityRoutineFilterFunclet));
                FilterFuncletPersonalityRoutine = new ImportThunk(
                    ILCompiler.ReadyToRunHelper.PersonalityRoutineFilterFunclet, this, filterFuncletPersonalityRoutineImport, useVirtualCall: false);
                graph.AddRoot(FilterFuncletPersonalityRoutine, "Filter funclet personality routine is faster to root early rather than referencing it from each unwind info");
            }

            MethodImports = new ImportSectionNode(
                "MethodImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(MethodImports);

            DispatchImports = new ImportSectionNode(
                "DispatchImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(DispatchImports);

            HelperImports = new ImportSectionNode(
                "HelperImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(HelperImports);

            PrecodeImports = new ImportSectionNode(
                "PrecodeImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(PrecodeImports);

            StringImports = new ImportSectionNode(
                "StringImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STRING_HANDLE,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_UNKNOWN,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(StringImports);

            graph.AddRoot(ImportSectionsTable, "Import sections table is always generated");
            graph.AddRoot(ModuleImport, "Module import is always generated");
            graph.AddRoot(EagerImports, "Eager imports are always generated");
            graph.AddRoot(MethodImports, "Method imports are always generated");
            graph.AddRoot(DispatchImports, "Dispatch imports are always generated");
            graph.AddRoot(HelperImports, "Helper imports are always generated");
            graph.AddRoot(PrecodeImports, "Precode helper imports are always generated");
            graph.AddRoot(StringImports, "String imports are always generated");
            graph.AddRoot(Header, "ReadyToRunHeader is always generated");
            graph.AddRoot(CopiedCorHeaderNode, "MSIL COR header is always generated");

            if (Win32ResourcesNode != null)
            {
                graph.AddRoot(Win32ResourcesNode, "Win32 Resources are placed if not empty");
            }

            MetadataManager.AttachToDependencyGraph(graph);
        }
예제 #2
0
        public void AttachToDependencyGraph(DependencyAnalyzerBase <NodeFactory> graph)
        {
            graph.ComputingDependencyPhaseChange += Graph_ComputingDependencyPhaseChange;

            var compilerIdentifierNode = new CompilerIdentifierNode(Target);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.CompilerIdentifier, compilerIdentifierNode, compilerIdentifierNode);

            RuntimeFunctionsTable = new RuntimeFunctionsTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.RuntimeFunctions, RuntimeFunctionsTable, RuntimeFunctionsTable);

            RuntimeFunctionsGCInfo = new RuntimeFunctionsGCInfoNode();
            graph.AddRoot(RuntimeFunctionsGCInfo, "GC info is always generated");

            ProfileDataSection = new ProfileDataSectionNode();
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ProfileDataInfo, ProfileDataSection, ProfileDataSection.StartSymbol);

            DelayLoadMethodCallThunks = new DelayLoadMethodCallThunkNodeRange();
            Header.Add(Internal.Runtime.ReadyToRunSectionType.DelayLoadMethodCallThunks, DelayLoadMethodCallThunks, DelayLoadMethodCallThunks);

            ExceptionInfoLookupTableNode exceptionInfoLookupTableNode = new ExceptionInfoLookupTableNode(this);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.ExceptionInfo, exceptionInfoLookupTableNode, exceptionInfoLookupTableNode);
            graph.AddRoot(exceptionInfoLookupTableNode, "ExceptionInfoLookupTable is always generated");

            ManifestMetadataTable = new ManifestMetadataTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ManifestMetadata, ManifestMetadataTable, ManifestMetadataTable);
            Resolver.SetModuleIndexLookup(ManifestMetadataTable.ModuleToIndex);

            ManifestAssemblyMvidHeaderNode mvidTableNode = new ManifestAssemblyMvidHeaderNode(ManifestMetadataTable);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.ManifestAssemblyMvids, mvidTableNode, mvidTableNode);

            AssemblyTableNode assemblyTable = null;

            if (CompilationModuleGroup.IsCompositeBuildMode)
            {
                assemblyTable = new AssemblyTableNode(Target);
                Header.Add(Internal.Runtime.ReadyToRunSectionType.ComponentAssemblies, assemblyTable, assemblyTable);
            }

            // Generate per assembly header tables
            int assemblyIndex = -1;

            foreach (EcmaModule inputModule in CompilationModuleGroup.CompilationModuleSet)
            {
                assemblyIndex++;
                HeaderNode tableHeader = Header;
                if (assemblyTable != null)
                {
                    AssemblyHeaderNode perAssemblyHeader = new AssemblyHeaderNode(Target, ReadyToRunFlags.READYTORUN_FLAG_Component, assemblyIndex);
                    assemblyTable.Add(perAssemblyHeader);
                    tableHeader = perAssemblyHeader;
                }

                MethodEntryPointTableNode methodEntryPointTable = new MethodEntryPointTableNode(inputModule, Target);
                tableHeader.Add(Internal.Runtime.ReadyToRunSectionType.MethodDefEntryPoints, methodEntryPointTable, methodEntryPointTable);

                TypesTableNode typesTable = new TypesTableNode(Target, inputModule);
                tableHeader.Add(Internal.Runtime.ReadyToRunSectionType.AvailableTypes, typesTable, typesTable);

                InliningInfoNode inliningInfoTable = new InliningInfoNode(Target, inputModule);
                tableHeader.Add(Internal.Runtime.ReadyToRunSectionType.InliningInfo2, inliningInfoTable, inliningInfoTable);

                // Core library attributes are checked FAR more often than other dlls
                // attributes, so produce a highly efficient table for determining if they are
                // present. Other assemblies *MAY* benefit from this feature, but it doesn't show
                // as useful at this time.
                if (inputModule == TypeSystemContext.SystemModule)
                {
                    AttributePresenceFilterNode attributePresenceTable = new AttributePresenceFilterNode(inputModule);
                    Header.Add(Internal.Runtime.ReadyToRunSectionType.AttributePresence, attributePresenceTable, attributePresenceTable);
                }
            }

            InstanceEntryPointTable = new InstanceEntryPointTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.InstanceMethodEntryPoints, InstanceEntryPointTable, InstanceEntryPointTable);

            ImportSectionsTable = new ImportSectionsTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ImportSections, ImportSectionsTable, ImportSectionsTable.StartSymbol);

            DebugInfoTable = new DebugInfoTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.DebugInfo, DebugInfoTable, DebugInfoTable);

            EagerImports = new ImportSectionNode(
                "EagerImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_EAGER,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(EagerImports);

            // All ready-to-run images have a module import helper which gets patched by the runtime on image load
            ModuleImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                          ReadyToRunHelper.Module));
            graph.AddRoot(ModuleImport, "Module import is required by the R2R format spec");

            if (Target.Architecture != TargetArchitecture.X86)
            {
                Import personalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                 ReadyToRunHelper.PersonalityRoutine));
                PersonalityRoutine = new ImportThunk(this,
                                                     ReadyToRunHelper.PersonalityRoutine, EagerImports, useVirtualCall: false, useJumpableStub: false);
                graph.AddRoot(PersonalityRoutine, "Personality routine is faster to root early rather than referencing it from each unwind info");

                Import filterFuncletPersonalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                              ReadyToRunHelper.PersonalityRoutineFilterFunclet));
                FilterFuncletPersonalityRoutine = new ImportThunk(this,
                                                                  ReadyToRunHelper.PersonalityRoutineFilterFunclet, EagerImports, useVirtualCall: false, useJumpableStub: false);
                graph.AddRoot(FilterFuncletPersonalityRoutine, "Filter funclet personality routine is faster to root early rather than referencing it from each unwind info");
            }

            if ((ProfileDataManager != null) && (ProfileDataManager.EmbedPgoDataInR2RImage))
            {
                // Profile instrumentation data attaches here
                HashSet <MethodDesc> methodsToInsertInstrumentationDataFor = new HashSet <MethodDesc>();
                foreach (EcmaModule inputModule in CompilationModuleGroup.CompilationModuleSet)
                {
                    foreach (MethodDesc method in ProfileDataManager.GetMethodsForModuleDesc(inputModule))
                    {
                        if (ProfileDataManager[method].SchemaData != null)
                        {
                            methodsToInsertInstrumentationDataFor.Add(method);
                        }
                    }
                }
                if (methodsToInsertInstrumentationDataFor.Count != 0)
                {
                    MethodDesc[] methodsToInsert = methodsToInsertInstrumentationDataFor.ToArray();
                    methodsToInsert.MergeSort(new TypeSystemComparer().Compare);
                    InstrumentationDataTable = new InstrumentationDataTableNode(this, methodsToInsert, ProfileDataManager);
                    Header.Add(Internal.Runtime.ReadyToRunSectionType.PgoInstrumentationData, InstrumentationDataTable, InstrumentationDataTable);
                }
            }

            MethodImports = new ImportSectionNode(
                "MethodImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(MethodImports);

            DispatchImports = new ImportSectionNode(
                "DispatchImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(DispatchImports);

            HelperImports = new ImportSectionNode(
                "HelperImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(HelperImports);

            PrecodeImports = new ImportSectionNode(
                "PrecodeImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(PrecodeImports);

            StringImports = new ImportSectionNode(
                "StringImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STRING_HANDLE,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_UNKNOWN,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(StringImports);

            graph.AddRoot(ImportSectionsTable, "Import sections table is always generated");
            graph.AddRoot(ModuleImport, "Module import is always generated");
            graph.AddRoot(EagerImports, "Eager imports are always generated");
            graph.AddRoot(MethodImports, "Method imports are always generated");
            graph.AddRoot(DispatchImports, "Dispatch imports are always generated");
            graph.AddRoot(HelperImports, "Helper imports are always generated");
            graph.AddRoot(PrecodeImports, "Precode helper imports are always generated");
            graph.AddRoot(StringImports, "String imports are always generated");
            graph.AddRoot(Header, "ReadyToRunHeader is always generated");
            graph.AddRoot(CopiedCorHeaderNode, "MSIL COR header is always generated for R2R files");
            graph.AddRoot(DebugDirectoryNode, "Debug Directory will always contain at least one entry");

            if (Win32ResourcesNode != null)
            {
                graph.AddRoot(Win32ResourcesNode, "Win32 Resources are placed if not empty");
            }

            MetadataManager.AttachToDependencyGraph(graph);
        }
예제 #3
0
        public override void AttachToDependencyGraph(DependencyAnalyzerBase <NodeFactory> graph)
        {
            Header = new HeaderNode(Target);

            var compilerIdentifierNode = new CompilerIdentifierNode(Target);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.CompilerIdentifier, compilerIdentifierNode, compilerIdentifierNode);

            RuntimeFunctionsTable = new RuntimeFunctionsTableNode(this);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.RuntimeFunctions, RuntimeFunctionsTable, RuntimeFunctionsTable);

            RuntimeFunctionsGCInfo = new RuntimeFunctionsGCInfoNode();
            graph.AddRoot(RuntimeFunctionsGCInfo, "GC info is always generated");

            ExceptionInfoLookupTableNode exceptionInfoLookupTableNode = new ExceptionInfoLookupTableNode(this);

            Header.Add(Internal.Runtime.ReadyToRunSectionType.ExceptionInfo, exceptionInfoLookupTableNode, exceptionInfoLookupTableNode);
            graph.AddRoot(exceptionInfoLookupTableNode, "ExceptionInfoLookupTable is always generated");

            MethodEntryPointTable = new MethodEntryPointTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.MethodDefEntryPoints, MethodEntryPointTable, MethodEntryPointTable);

            InstanceEntryPointTable = new InstanceEntryPointTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.InstanceMethodEntryPoints, InstanceEntryPointTable, InstanceEntryPointTable);

            TypesTable = new TypesTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.AvailableTypes, TypesTable, TypesTable);

            ImportSectionsTable = new ImportSectionsTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.ImportSections, ImportSectionsTable, ImportSectionsTable.StartSymbol);

            DebugInfoTable = new DebugInfoTableNode(Target);
            Header.Add(Internal.Runtime.ReadyToRunSectionType.DebugInfo, DebugInfoTable, DebugInfoTable);

            EagerImports = new ImportSectionNode(
                "EagerImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_EAGER,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(EagerImports);

            // All ready-to-run images have a module import helper which gets patched by the runtime on image load
            ModuleImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                          ILCompiler.DependencyAnalysis.ReadyToRun.ReadyToRunHelper.READYTORUN_HELPER_Module));
            graph.AddRoot(ModuleImport, "Module import is required by the R2R format spec");

            if (Target.Architecture != TargetArchitecture.X86)
            {
                Import personalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                 ILCompiler.DependencyAnalysis.ReadyToRun.ReadyToRunHelper.READYTORUN_HELPER_PersonalityRoutine));
                PersonalityRoutine = new ImportThunk(
                    ILCompiler.DependencyAnalysis.ReadyToRun.ReadyToRunHelper.READYTORUN_HELPER_PersonalityRoutine, this, personalityRoutineImport);
                graph.AddRoot(PersonalityRoutine, "Personality routine is faster to root early rather than referencing it from each unwind info");

                Import filterFuncletPersonalityRoutineImport = new Import(EagerImports, new ReadyToRunHelperSignature(
                                                                              ILCompiler.DependencyAnalysis.ReadyToRun.ReadyToRunHelper.READYTORUN_HELPER_PersonalityRoutineFilterFunclet));
                FilterFuncletPersonalityRoutine = new ImportThunk(
                    ILCompiler.DependencyAnalysis.ReadyToRun.ReadyToRunHelper.READYTORUN_HELPER_PersonalityRoutineFilterFunclet, this, filterFuncletPersonalityRoutineImport);
                graph.AddRoot(FilterFuncletPersonalityRoutine, "Filter funclet personality routine is faster to root early rather than referencing it from each unwind info");
            }

            MethodImports = new ImportSectionNode(
                "MethodImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(MethodImports);

            DispatchImports = new ImportSectionNode(
                "DispatchImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STUB_DISPATCH,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: true);
            ImportSectionsTable.AddEmbeddedObject(DispatchImports);

            HelperImports = new ImportSectionNode(
                "HelperImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: false,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(HelperImports);

            PrecodeImports = new ImportSectionNode(
                "PrecodeImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_UNKNOWN,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_PCODE,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(PrecodeImports);

            StringImports = new ImportSectionNode(
                "StringImports",
                CorCompileImportType.CORCOMPILE_IMPORT_TYPE_STRING_HANDLE,
                CorCompileImportFlags.CORCOMPILE_IMPORT_FLAGS_UNKNOWN,
                (byte)Target.PointerSize,
                emitPrecode: true,
                emitGCRefMap: false);
            ImportSectionsTable.AddEmbeddedObject(StringImports);

            graph.AddRoot(ImportSectionsTable, "Import sections table is always generated");
            graph.AddRoot(ModuleImport, "Module import is always generated");
            graph.AddRoot(EagerImports, "Eager imports are always generated");
            graph.AddRoot(MethodImports, "Method imports are always generated");
            graph.AddRoot(DispatchImports, "Dispatch imports are always generated");
            graph.AddRoot(HelperImports, "Helper imports are always generated");
            graph.AddRoot(PrecodeImports, "Precode imports are always generated");
            graph.AddRoot(StringImports, "String imports are always generated");
            graph.AddRoot(Header, "ReadyToRunHeader is always generated");

            MetadataManager.AttachToDependencyGraph(graph);
        }