NullReferenceException - parent is null

Hi,
I tried to parse C++ code, but always exception raised.
Excluded almost everything, I found file it causes - std string from msvc.
You can reproduce the error using following code
string file = "C:\\Program Files\\Microsoft Visual Studio\\2022\\Professional\\VC\\Tools\\MSVC\\14.40.33807\\include\\string";
CppCompilation compilation = CppParser.ParseFiles(new List<string>() { file }, null);

Stack trace
at CppAst.CppModelBuilder.GetOrCreateDeclarationContainer(CXCursor cursor, Void* data) in D:\Projects.....\CppAst.NET\src\CppAst\CppModelBuilder.cs:line 142

Parsing at:
{Line 625, Column 9 in C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\corecrt.h to Line 629, Column 2 in C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt\corecrt.h}

Clang doesn't provide support by default for MSVC header files, so you will have to setup this yourselve. There is a helper method CppParserOptions.ConfigureForWindowsMsvc that should help with this.

CppAst.NET/src/CppAst/CppParserOptions.cs

Lines 170 to 214 in 2eaee79

    
           public CppParserOptions ConfigureForWindowsMsvc(CppTargetCpu targetCpu = CppTargetCpu.X86, CppVisualStudioVersion vsVersion = CppVisualStudioVersion.VS2022) 
        
           { 
        
               // 1920 
        
               var highVersion = ((int)vsVersion) / 100;  // => 19 
        
               var lowVersion = ((int)vsVersion) % 100;   // => 20 
        
               var versionAsString = $"{highVersion}.{lowVersion}"; 
        
               TargetCpu = targetCpu; 
        
               TargetCpuSub = string.Empty; 
        
               TargetVendor = "pc"; 
        
               TargetSystem = "windows"; 
        
               TargetAbi = $"msvc{versionAsString}"; 
        
               // See https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2019 
        
               Defines.Add($"_MSC_VER={(int)vsVersion}"); 
        
               Defines.Add("_WIN32=1"); 
        
               switch (targetCpu) 
        
               { 
        
                   case CppTargetCpu.X86: 
        
                       Defines.Add("_M_IX86=600"); 
        
                       break; 
        
                   case CppTargetCpu.X86_64: 
        
                       Defines.Add("_M_AMD64=100"); 
        
                       Defines.Add("_M_X64=100"); 
        
                       Defines.Add("_WIN64=1"); 
        
                       break; 
        
                   case CppTargetCpu.ARM: 
        
                       Defines.Add("_M_ARM=7"); 
        
                       break; 
        
                   case CppTargetCpu.ARM64: 
        
                       Defines.Add("_M_ARM64=1"); 
        
                       Defines.Add("_WIN64=1"); 
        
                       break; 
        
                   default: 
        
                       throw new ArgumentOutOfRangeException(nameof(targetCpu), targetCpu, null); 
        
               } 
        
               AdditionalArguments.Add("-fms-extensions"); 
        
               AdditionalArguments.Add("-fms-compatibility"); 
        
               AdditionalArguments.Add($"-fms-compatibility-version={versionAsString}"); 
        
               return this; 
        
           }

No, it's not a msvc-relative problem. At cppast 0.8.0-alpha001/clang 12 everything works fine without options manipulations. It seems, problem is in struct parsing (_Mbstatet {...} in this case), old version gets SemanticParent of kind CXCursorKind.CXCursor_UnexposedDecl = CXCursor_FirstDecl and container for structure set as _rootContainerContext.
New version work with SemanticParent = CXCursor_LinkageSpec and it falls at default Unhandled(cursor);
As far I understand one of this versions handle struct incorrectly.

Fix access to cppClass.FullName in debug that could fail (#106)

I haven't been able to reproduce it in Debug with latest repository. Though, I found a problem in debug that should be fixed via c2cbfe5.

0.8.0 is extremely old and lots of things have changed regarding template parameter/argument parsing. I personally don't use/care about C++ parsing so you will have to investigate this further within the existing codebase.

Add coverage roadmap tests and parser fixes (#86 #88 #106 #116)

Fixed via commit 320bc7e

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NullReferenceException - parent is null #106

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	public CppParserOptions ConfigureForWindowsMsvc(CppTargetCpu targetCpu = CppTargetCpu.X86, CppVisualStudioVersion vsVersion = CppVisualStudioVersion.VS2022)
	{
	// 1920
	var highVersion = ((int)vsVersion) / 100; // => 19
	var lowVersion = ((int)vsVersion) % 100; // => 20

	var versionAsString = $"{highVersion}.{lowVersion}";

	TargetCpu = targetCpu;
	TargetCpuSub = string.Empty;
	TargetVendor = "pc";
	TargetSystem = "windows";
	TargetAbi = $"msvc{versionAsString}";

	// See https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=vs-2019

	Defines.Add($"_MSC_VER={(int)vsVersion}");
	Defines.Add("_WIN32=1");

	switch (targetCpu)
	{
	case CppTargetCpu.X86:
	Defines.Add("_M_IX86=600");
	break;
	case CppTargetCpu.X86_64:
	Defines.Add("_M_AMD64=100");
	Defines.Add("_M_X64=100");
	Defines.Add("_WIN64=1");
	break;
	case CppTargetCpu.ARM:
	Defines.Add("_M_ARM=7");
	break;
	case CppTargetCpu.ARM64:
	Defines.Add("_M_ARM64=1");
	Defines.Add("_WIN64=1");
	break;
	default:
	throw new ArgumentOutOfRangeException(nameof(targetCpu), targetCpu, null);
	}

	AdditionalArguments.Add("-fms-extensions");
	AdditionalArguments.Add("-fms-compatibility");
	AdditionalArguments.Add($"-fms-compatibility-version={versionAsString}");
	return this;
	}

NullReferenceException - parent is null #106

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xoofx commented on Aug 19, 2024

Braidon commented on Aug 19, 2024

xoofx commented on Aug 20, 2024

xoofx commented on Jun 7, 2026

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