Unreal Header Tool Crash when using GENERATED_BODY() instead of GENERATED_UINTERFACE_BODY() in 4.7

Development Programming & Scripting C++
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1

When using GENERATED_BODY() instead of GENERATED_UINTERFACE_BODY() in a declaration of a UInterface, the Unreal Header Tool crashes in 4.7. This compiled successfully under 4.6.

2

Hey BrainDx-

Are still seeing the same crash in 4.7.2? If so how are you creating your UInterface? Could you post the callstack and log files from the crash as well?

Cheers

3

Yes, this still occurs in 4.7.2. I’m creating the interface as follows:

UINTERFACE()
class USomeInterface : public UInterface
{
public:
	GENERATED_BODY()
};

class ISomeInterface
{
	GENERATED_IINTERFACE_BODY()

public:
	public void SomeFunction() {}
};

I believe the issue is that for some reason ClassRange is NULL in the following crash callstack:

>	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::ExportInterfaceClassDeclaration(FClass * Class) Line 1861	C++
 	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::ExportClassHeaderInner(FClass * Class, bool bValidNonTemporaryClass) Line 2075	C++
 	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::ExportClassHeaderWrapper(FClass * Class, bool bIsExportClass) Line 2220	C++
 	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::ExportClassHeaderRecursive(FClasses & AllClasses, FClass * Class, TArray<FClass *,FDefaultAllocator> & DependencyChain, TSet<UClass const *,DefaultKeyFuncs<UClass const *,0>,FDefaultSetAllocator> & VisitedSet, bool bCheckDependenciesOnly) Line 2461	C++
 	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::ExportClassHeader(FClasses & AllClasses, FClass * Class) Line 1912	C++
 	UnrealHeaderTool.exe!FNativeClassHeaderGenerator::FNativeClassHeaderGenerator(UPackage * InPackage, FClasses & AllClasses, bool InAllowSaveExportedHeaders) Line 4444	C++
 	UnrealHeaderTool.exe!FHeaderParser::ExportNativeHeaders(UPackage * CurrentPackage, FClasses & AllClasses, bool bAllowSaveExportedHeaders) Line 6699	C++
 	UnrealHeaderTool.exe!FHeaderParser::ParseAllHeadersInside(FClasses & ModuleClasses, FFeedbackContext * Warn, UPackage * CurrentPackage, const FManifestModule & Module, TArray<IScriptGeneratorPluginInterface *,FDefaultAllocator> & ScriptPlugins) Line 6847	C++
 	UnrealHeaderTool.exe!UnrealHeaderTool_Main(const FString & ModuleInfoFilename) Line 5194	C++
 	UnrealHeaderTool.exe!wmain(int ArgC, wchar_t * * ArgV) Line 80	C++
 	UnrealHeaderTool.exe!__tmainCRTStartup() Line 623	C
4

I ran into this issue too. I created a pull request that fixes the issue so UHT will generate an error message rather than crashing.

5

Hi BrainDX,

I just wanted to give you an update on this issue. There is an existing ticket in place to investigate this crash (UE-11256). The pull request that Lee Berger had submitted has been brought in, so I am expecting the ticket to be closed soon.