Segmentation Fault on ParseHeader

[junalmeida]

Brief Description

The application is aborting with Segmentation Fault. I could get the stack trace below by attaching gdb to the process spawned by dotnet run. The library CppSharp is referenced by nuget: <PackageReference Include="CppSharp" Version="1.1.5.3168" />.

OS: Linux (Ubuntu Noble, x86_64)

Used headers

/usr/include/x86_64-linux-gnu/qt6/QtCore/QtCore v6.8.1

Used settings

            driver.ParserOptions.MicrosoftMode = false;
            driver.ParserOptions.NoBuiltinIncludes = true;
            driver.ParserOptions.NoStandardIncludes = true;
            driver.ParserOptions.UnityBuild = true;
            driver.ParserOptions.SkipPrivateDeclarations = false;
            driver.ParserOptions.LanguageVersion = CppSharp.Parser.LanguageVersion.CPP17;

            driver.Options.GeneratorKind = GeneratorKind.CSharp;
            driver.Options.CheckSymbols = true;
            driver.Options.CompileCode = true;
            driver.Options.GenerateDefaultValuesForArguments = true;
            driver.Options.GenerateClassTemplates = true;
            driver.Options.MarshalCharAsManagedChar = true;
            driver.Options.CommentKind = CommentKind.BCPLSlash;

Target: x86_64-linux-gnu

Other settings

Stack trace or incompilable generated code

libCppSharp.CppParser.so!clang::DeclarationName::getStoredNameKind() (/home/runner/work/CppSharp/CppSharp/build/llvm/llvm-6eb36a-linux-x64-gcc-11-Release/clang/include/clang/AST/DeclarationName.h:266)
libCppSharp.CppParser.so!clang::DeclarationName::isIdentifier() (/home/runner/work/CppSharp/CppSharp/build/llvm/llvm-6eb36a-linux-x64-gcc-11-Release/clang/include/clang/AST/DeclarationName.h:384)
libCppSharp.CppParser.so!clang::DeclarationName::getAsIdentifierInfo() (/home/runner/work/CppSharp/CppSharp/build/llvm/llvm-6eb36a-linux-x64-gcc-11-Release/clang/include/clang/AST/DeclarationName.h:420)
libCppSharp.CppParser.so!clang::NamedDecl::getIdentifier() (/home/runner/work/CppSharp/CppSharp/build/llvm/llvm-6eb36a-linux-x64-gcc-11-Release/clang/include/clang/AST/Decl.h:268)
libCppSharp.CppParser.so!GetDeclName(const clang::NamedDecl * D, const clang::NamedDecl * D@entry) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:459)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkTypeTemplateParameter(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, const clang::TemplateTypeParmDecl * TTPD) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:1424)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkType(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, clang::QualType QualType, const clang::TypeLoc * TL, const clang::TypeLoc * TL@entry, bool DesugarType, bool DesugarType@entry) (/home/runner/work/CppSharp/CppSharp/build/llvm/llvm-6eb36a-linux-x64-gcc-11-Release/llvm/include/llvm/ADT/PointerIntPair.h:110)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::GetQualifiedType(CppSharp::CppParser::Parser * const this, clang::QualType qual, const clang::TypeLoc * TL) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:591)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkParameter(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, const clang::ParmVarDecl * PVD, const clang::ParmVarDecl * PVD@entry, const clang::SourceLocation & ParamStartLoc) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:3167)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkFunction(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, const clang::FunctionDecl * FD, const clang::FunctionDecl * FD@entry, CppSharp::CppParser::AST::Function * F, CppSharp::CppParser::AST::Function * F@entry) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:3374)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkFunction(CppSharp::CppParser::Parser * const this, const clang::FunctionDecl * FD) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:3443)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkFunctionTemplate(CppSharp::CppParser::Parser * const this, const clang::FunctionTemplateDecl * TD, const clang::FunctionTemplateDecl * TD@entry) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:1638)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkDeclaration(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, const clang::Decl * D, const clang::Decl * D@entry) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:4055)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkDeclarationDef(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, clang::Decl * D, clang::Decl * D@entry) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:3990)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::WalkAST(CppSharp::CppParser::Parser * const this, clang::TranslationUnitDecl * TU) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:3489)
libCppSharp.CppParser.so!clang::ParseAST(clang::Sema&, bool, bool) (Unknown Source:0)
libCppSharp.CppParser.so!CppSharp::CppParser::Parser::Parse(CppSharp::CppParser::Parser * const this, CppSharp::CppParser::Parser * const this@entry, const std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > & SourceFiles) (/usr/include/c++/11/bits/unique_ptr.h:173)
libCppSharp.CppParser.so!CppSharp::CppParser::ClangParser::ParseHeader(CppSharp::CppParser::CppParserOptions * Opts) (/home/runner/work/CppSharp/CppSharp/src/CppParser/Parser.cpp:4774)
[Unknown/Just-In-Time compiled code] (Unknown Source:0)

[tritao]

We need the header code for reproduction.

[junalmeida]

The header is QtCore 6.8.1

[duckdoom5]

I ran into the same issue while working on #1891. It's caused by this line. The getDecl() here can return nullptr if the template parameter is itself a template parameter. Eg.

template<class T>
void MyFunction() {
    using MyNestedType = MyOtherTemplate<T>;
}