[LLVMdev] An asserting value handle still pointed to this value! (Value.cpp:633) (original) (raw)

Duncan P. N. Exon Smith dexonsmith at apple.com
Mon Feb 23 20:35:43 PST 2015

On 2015 Feb 23, at 19:29, Paul Vario <paul.paul.mit at gmail.com> wrote:

Hi, When I try using eraseFromParent to delete a function declaration (useempty), the following error was trigger: While deleting: void (%"class.Concurrency::index") %ZN11Concurrency5indexILi1EE21_cxxampopenclindexEv An asserting value handle still pointed to this value! UNREACHABLE executed at /home/pvario/cppamp/src/compiler/lib/IR/Value.cpp:633! What could be the cause of this? Thanks in advance.

This means that there's a value handle referencing that function. I recommend looking at what's going on in a debugger.

A quick git grep says that in LLVM ToT there are references to AssertingVH in these files:

$ git grep -l AssertingVH include/llvm/Analysis/AliasSetTracker.h include/llvm/Analysis/CallGraph.h include/llvm/Analysis/ScalarEvolution.h include/llvm/Analysis/ScalarEvolutionExpander.h include/llvm/ExecutionEngine/ExecutionEngine.h include/llvm/IR/IRBuilder.h include/llvm/IR/ValueHandle.h lib/Analysis/LazyValueInfo.cpp lib/CodeGen/MachineModuleInfo.cpp lib/ExecutionEngine/ExecutionEngine.cpp lib/IR/Value.cpp lib/Transforms/IPO/MergeFunctions.cpp lib/Transforms/Scalar/IndVarSimplify.cpp lib/Transforms/Scalar/JumpThreading.cpp lib/Transforms/Scalar/Reassociate.cpp lib/Transforms/Utils/Local.cpp unittests/IR/ValueHandleTest.cpp $ cd tools/clang/ $ git grep -l AssertingVH lib/CodeGen/CGOpenMPRuntime.h lib/CodeGen/CodeGenFunction.h

Likely, something there has an active handle to your function.

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