[cfe-dev] Possible bug in clang when invoked from dll

Kim R via cfe-dev cfe-dev at lists.llvm.org
Mon Mar 13 08:07:48 PDT 2017 

I solved this problem and I'll explain in case anyone else using VS2015
runs into the same issue. You need to set SDL to disabled in VS2015
otherwise the hasHungOffUses value gets incorrectly memset to zero after
the call to the User operator new. If you disable sdl then clang works as
expected.

On Thu, Mar 9, 2017 at 11:44 PM, Kim R <soldoutseashell at gmail.com> wrote:

> Hi guys,
>
> I'm having an issue with clang/llvm since I upgraded my compiler from
> VS2013 to VS2015. I'm invoking clang programmatically to compile C++ source
> files and up till now it has worked fine but since the upgrade and
> recompiling all the clang/llvm libraries I'm getting some errors deep
> inside the clang/llvm source without having changed any code on my end. The
> problem I'm facing right now is an assertion being triggered in an llvm
> class:
>
> My code is very simple; I literally just invoke the compiler. I've
> pastebinned example dll code here: http://pastebin.com/wpS6VX5N I would
> greatly appreciate it if someone could take a quick look to make sure I'm
> not making a mistake, but I don't think I am.
>
> A weird thing is that when this invocation code is built into a debug dll
> with optimization disabled (as I need in my project), I hit the previously
> mentioned assert when running, but it works perfectly when it's compiled
> straight into a debug executable. If I set the optimization level to O2
> instead of disabled on the dll then it also works fine.
>
> Does anyone have any idea about what could be causing this?
>
> (I've resent this message from a different address because it seems I'm
> having some issues receiving emails despite being subscribed to the list)
>
> Assertion failed: HasHungOffUses && "alloc must have hung off uses", file
> F:\Cla
> nggit\llvm\lib\IR\User.cpp, line 44
>
> Here is the complete call stack up till the assertion:
>
> ucrtbased.dll!___threadid () Unknown
>   ucrtbased.dll!___acrt_report_runtime_error () Unknown
>   ucrtbased.dll!_abort () Unknown
>   ucrtbased.dll!__crt_char_traits<char>::tcsncat_s<char * &,unsigned int
> const &,char const * const &,unsigned int const >(char * &,unsigned int
> const &,char const * const &,unsigned int const &&) Unknown
>   ucrtbased.dll!__get_wide_winmain_command_line () Unknown
>   ucrtbased.dll!__get_wide_winmain_command_line () Unknown
>   ucrtbased.dll!__wassert () Unknown
>   Plugin_Clang_d.dll!llvm::User::allocHungoffUses(unsigned int N, bool
> IsPhi) Line 44 C++
> > Plugin_Clang_d.dll!llvm::Function::allocHungoffUselist() Line 1234 C++
>   Plugin_Clang_d.dll!llvm::Function::setHungoffOperand<0>(llvm::Constant
> * C) Line 1247 C++
>   Plugin_Clang_d.dll!llvm::Function::setPersonalityFn(llvm::Constant *
> Fn) Line 1205 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::getInvokeDestImpl()
> Line 722 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::getInvokeDest()
> Line 1412 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCall(const
> clang::CodeGen::CGFunctionInfo & CallInfo, const clang::CodeGen::CGCallee &
> Callee, clang::CodeGen::ReturnValueSlot ReturnValue, const
> clang::CodeGen::CallArgList & CallArgs, llvm::Instruction * * callOrInvoke)
> Line 4090 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCXXMemberOrOperatorCall(const
> clang::CXXMethodDecl * MD, const clang::CodeGen::CGCallee & Callee,
> clang::CodeGen::ReturnValueSlot ReturnValue, llvm::Value * This,
> llvm::Value * ImplicitParam, clang::QualType ImplicitParamTy, const
> clang::CallExpr * CE, clang::CodeGen::CallArgList * RtlArgs) Line 91 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCXXM
> emberOrOperatorMemberCallExpr(const clang::CallExpr * CE, const
> clang::CXXMethodDecl * MD, clang::CodeGen::ReturnValueSlot ReturnValue,
> bool HasQualifier, clang::NestedNameSpecifier * Qualifier, bool IsArrow,
> const clang::Expr * Base) Line 385 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCXXMemberCallExpr(const
> clang::CXXMemberCallExpr * CE, clang::CodeGen::ReturnValueSlot
> ReturnValue) Line 188 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCallExpr(const
> clang::CallExpr * E, clang::CodeGen::ReturnValueSlot ReturnValue) Line
> 3870 C++
>   Plugin_Clang_d.dll!`anonymous namespace'::ScalarExprEmitter::VisitCallExpr(const
> clang::CallExpr * E) Line 405 C++
>   Plugin_Clang_d.dll!clang::StmtVisitorBase<clang::make_ptr,`anonymous
> namespace'::ScalarExprEmitter,llvm::Value *>::VisitCXXMemberCallExpr(clang::CXXMemberCallExpr
> * S) Line 339 C++
>   Plugin_Clang_d.dll!clang::StmtVisitorBase<clang::make_ptr,`anonymous
> namespace'::ScalarExprEmitter,llvm::Value *>::Visit(clang::Stmt * S) Line
> 339 C++
>   Plugin_Clang_d.dll!`anonymous namespace'::ScalarExprEmitter::Visit(clang::Expr
> * E) Line 260 C++
>   Plugin_Clang_d.dll!`anonymous namespace'::ScalarExprEmitter::VisitCastExpr(clang::CastExpr
> * CE) Line 1501 C++
>   Plugin_Clang_d.dll!clang::StmtVisitorBase<clang::make_ptr,`anonymous
> namespace'::ScalarExprEmitter,llvm::Value *>::VisitImplicitCastExpr(clang::ImplicitCastExpr
> * S) Line 423 C++
>   Plugin_Clang_d.dll!clang::StmtVisitorBase<clang::make_ptr,`anonymous
> namespace'::ScalarExprEmitter,llvm::Value *>::Visit(clang::Stmt * S) Line
> 423 C++
>   Plugin_Clang_d.dll!`anonymous namespace'::ScalarExprEmitter::Visit(clang::Expr
> * E) Line 260 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitScalarExpr(const
> clang::Expr * E, bool IgnoreResultAssign) Line 3621 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EvaluateExprAsBool(const
> clang::Expr * E) Line 123 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitBranchOnBoolExpr(const
> clang::Expr * Cond, llvm::BasicBlock * TrueBlock, llvm::BasicBlock *
> FalseBlock, unsigned __int64 TrueCount) Line 1508 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitBranchOnBoolExpr(const
> clang::Expr * Cond, llvm::BasicBlock * TrueBlock, llvm::BasicBlock *
> FalseBlock, unsigned __int64 TrueCount) Line 1430 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitIfStmt(const
> clang::IfStmt & S) Line 656 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitStmt(const
> clang::Stmt * S) Line 134 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(const
> clang::CompoundStmt & S, bool GetLast, clang::CodeGen::AggValueSlot
> AggSlot) Line 381 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::EmitFunc
> tionBody(clang::CodeGen::FunctionArgList & Args, const clang::Stmt *
> Body) Line 990 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl
> GD, llvm::Function * Fn, const clang::CodeGen::CGFunctionInfo & FnInfo)
> Line 1161 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenModule::EmitGlobal
> FunctionDefinition(clang::GlobalDecl GD, llvm::GlobalValue * GV) Line 3052
> C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl
> GD, llvm::GlobalValue * GV) Line 1888 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenModule::EmitDeferred() Line
> 1360 C++
>   Plugin_Clang_d.dll!clang::CodeGen::CodeGenModule::Release() Line 377 C++
>   Plugin_Clang_d.dll!`anonymous namespace'::CodeGeneratorImpl:
> :HandleTranslationUnit(clang::ASTContext & Ctx) Line 261 C++
>   Plugin_Clang_d.dll!clang::BackendConsumer::HandleTranslationUnit(clang::ASTContext
> & C) Line 205 C++
>   Plugin_Clang_d.dll!clang::ParseAST(clang::Sema & S, bool PrintStats,
> bool SkipFunctionBodies) Line 159 C++
>   Plugin_Clang_d.dll!clang::ASTFrontendAction::ExecuteAction() Line 567
> C++
>   Plugin_Clang_d.dll!clang::CodeGenAction::ExecuteAction() Line 991 C++
>   Plugin_Clang_d.dll!clang::FrontendAction::Execute() Line 468 C++
>   Plugin_Clang_d.dll!clang::CompilerInstance::ExecuteAction(clang::FrontendAction
> & Act) Line 951 C++
>   Plugin_Clang_d.dll!clang::ExecuteCompilerInvocation(clang::CompilerInstance
> * Clang) Line 249 C++
>   Plugin_Clang_d.dll!Compiler::compile(const char * * ArgBegin, const
> char * * ArgEnd, const char * Argv0, ASTVisitor & visitor) Line 536 C++
>   Plugin_Clang_d.dll!Compiler::compile(const char * srcFilePath, const
> char * outputFilePath, Scripta::result & result, const char * * args,
> unsigned int argsSize) Line 287 C++
>   scripta-example.exe!ScriptaPlatform::compile(const char * filePath,
> const char * outputFile) Line 233 C++
>   scripta-example.exe!ScriptaPlatform::load(const char * filename) Line
> 395 C++
>   scripta-example.exe!main() Line 380 C++
>   [External Code]
>
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