Allow generating Dwarf version 5

src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets

@@ -246,6 +246,7 @@ The .NET Foundation licenses this file to you under the MIT license.
       <IlcArg Condition="$(IlcMultiModule) == 'true'" Include="--multifile" />
       <IlcArg Condition="$(Optimize) == 'true'" Include="-O" />
       <IlcArg Condition="$(NativeDebugSymbols) == 'true'" Include="-g" />
+      <IlcArg Condition="$(IlcDwarfVersion) == '5'" Include="--gdwarf-5" />
       <IlcArg Condition="$(IlcGenerateMapFile) == 'true'" Include="--map:$(NativeIntermediateOutputPath)%(ManagedBinary.Filename).map.xml" />
       <IlcArg Condition="$(IlcGenerateDgmlFile) == 'true'" Include="--dgmllog:$(NativeIntermediateOutputPath)%(ManagedBinary.Filename).codegen.dgml.xml" />
       <IlcArg Condition="$(IlcGenerateDgmlFile) == 'true'" Include="--scandgmllog:$(NativeIntermediateOutputPath)%(ManagedBinary.Filename).scan.dgml.xml" />

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/CompilationBuilder.Aot.cs

@@ -24,6 +24,7 @@ partial class CompilationBuilder
         protected bool _methodBodyFolding;
         protected InstructionSetSupport _instructionSetSupport;
         protected SecurityMitigationOptions _mitigationOptions;
+        protected bool _useDwarf5;
 
         partial void InitializePartial()
         {
@@ -103,6 +104,12 @@ public CompilationBuilder UseMethodImportationErrorProvider(MethodImportationErr
             return this;
         }
 
+        public CompilationBuilder UseDwarf5(bool value)
+        {
+            _useDwarf5 = value;
+            return this;
+        }
+
         protected PreinitializationManager GetPreinitializationManager()
         {
             if (_preinitializationManager == null)

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/DependencyAnalysis/ObjectWriter.cs

@@ -85,6 +85,9 @@ public class ObjectWriter : IDisposable, ITypesDebugInfoWriter
         [DllImport(NativeObjectWriterFileName)]
         private static extern void FinishObjWriter(IntPtr objWriter);
 
+        [DllImport(NativeObjectWriterFileName)]
+        private static extern void SetDwarfVersion(IntPtr objWriter, ushort v);
+
         [DllImport(NativeObjectWriterFileName)]
         private static extern void SwitchSection(IntPtr objWriter, string sectionName, CustomSectionAttributes attributes = 0, string comdatName = null);
 
@@ -884,6 +887,11 @@ public ObjectWriter(string objectFilePath, NodeFactory factory, ObjectWritingOpt
             _isSingleFileCompilation = _nodeFactory.CompilationModuleGroup.IsSingleFileCompilation;
             _userDefinedTypeDescriptor = new UserDefinedTypeDescriptor(this, factory);
             _options = options;
+
+            if ((_options & ObjectWritingOptions.UseDwarf5) != 0)
+            {
+                SetDwarfVersion(_nativeObjectWriter, 5);
+            }
         }
 
         public void Dispose()
@@ -1319,5 +1327,6 @@ public enum ObjectWritingOptions
     {
         GenerateDebugInfo = 0x01,
         ControlFlowGuard = 0x02,
+        UseDwarf5 = 0x4,
     }
 }

src/coreclr/tools/aot/ILCompiler.RyuJit/Compiler/RyuJitCompilation.cs

@@ -92,6 +92,9 @@ protected override void CompileInternal(string outputFile, ObjectDumper dumper)
             NodeFactory.SetMarkingComplete();
 
             ObjectWritingOptions options = default;
+            if ((_compilationOptions & RyuJitCompilationOptions.UseDwarf5) != 0)
+                options |= ObjectWritingOptions.UseDwarf5;
+
             if (_debugInformationProvider is not NullDebugInformationProvider)
                 options |= ObjectWritingOptions.GenerateDebugInfo;
 
@@ -242,5 +245,6 @@ public enum RyuJitCompilationOptions
     {
         MethodBodyFolding = 0x1,
         ControlFlowGuardAnnotations = 0x2,
+        UseDwarf5 = 0x4,
     }
 }

src/coreclr/tools/aot/ILCompiler.RyuJit/Compiler/RyuJitCompilationBuilder.cs

@@ -110,6 +110,9 @@ public override ICompilation ToCompilation()
             if ((_mitigationOptions & SecurityMitigationOptions.ControlFlowGuardAnnotations) != 0)
                 options |= RyuJitCompilationOptions.ControlFlowGuardAnnotations;
 
+            if (_useDwarf5)
+                options |= RyuJitCompilationOptions.UseDwarf5;
+
             var factory = new RyuJitNodeFactory(_context, _compilationGroup, _metadataManager, _interopStubManager, _nameMangler, _vtableSliceProvider, _dictionaryLayoutProvider, GetPreinitializationManager());
 
             JitConfigProvider.Initialize(_context.Target, jitFlagBuilder.ToArray(), _ryujitOptions);

src/coreclr/tools/aot/ILCompiler/Program.cs

@@ -61,6 +61,7 @@ internal class Program
         private string _instructionSet;
         private string _guard;
         private int _maxGenericCycle = CompilerTypeSystemContext.DefaultGenericCycleCutoffPoint;
+        private bool _useDwarf5;
 
         private string _singleMethodTypeName;
         private string _singleMethodName;
@@ -178,6 +179,7 @@ private ArgumentSyntax ParseCommandLine(string[] args)
                 syntax.DefineOption("Ot", ref optimizeTime, "Enable optimizations, favor code speed");
                 syntax.DefineOptionList("m|mibc", ref _mibcFilePaths, "Mibc file(s) for profile guided optimization"); ;
                 syntax.DefineOption("g", ref _enableDebugInfo, "Emit debugging information");
+                syntax.DefineOption("gdwarf-5", ref _useDwarf5, "Generate source-level debug information with dwarf version 5");
                 syntax.DefineOption("nativelib", ref _nativeLib, "Compile as static or shared library");
                 syntax.DefineOption("exportsfile", ref _exportsFile, "File to write exported method definitions");
                 syntax.DefineOption("dgmllog", ref _dgmlLogFileName, "Save result of dependency analysis as DGML");
@@ -769,7 +771,8 @@ static string ILLinkify(string rootedAssembly)
                 .UseCompilationRoots(compilationRoots)
                 .UseOptimizationMode(_optimizationMode)
                 .UseSecurityMitigationOptions(securityMitigationOptions)
-                .UseDebugInfoProvider(debugInfoProvider);
+                .UseDebugInfoProvider(debugInfoProvider)
+                .UseDwarf5(_useDwarf5);
 
             if (scanResults != null)
             {