Problems with Clang since upgrading compiler to Visual Studio 2015

Kim1 · February 28, 2017, 8:29am

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:

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::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::EmitCXXMemberOrOperatorMemberCallExpr(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::EmitFunctionBody(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::EmitGlobalFunctionDefinition(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]

Here’s hoping someone here can give me some guidance on resolving this issue.

Thanks a lot for your time.

Yaron_Keren · February 28, 2017, 9:07am

Are you using VS 2015 Update 3?
Does this happen with optimization disabled?

‫בתאריך יום ג׳, 28 בפבר׳ 2017 ב-10:39 מאת ‪Kim via cfe-dev‬‏ <‪cfe-dev@lists.llvm.org‬‏>:‬

Kim1 · March 3, 2017, 12:47pm

That may be so but I’m not sure where the bug could be occurring because my code is very simple; I literally just invoke the compiler. I’ve pastebinned my code here: http://pastebin.com/wpS6VX5N

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.