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

Kim R via cfe-dev cfe-dev at lists.llvm.org
Thu Mar 9 07:44:16 PST 2017


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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