[llvm-dev] Bug in 3.9.0 RTDyldMemoryManager.cpp

Matt Godbolt via llvm-dev llvm-dev at lists.llvm.org
Fri Sep 30 12:13:20 PDT 2016

Hi folks,

I'm still using MCJIT (I know, I know), and I spotted a crash in exception
handling when I moved from llvm 3.8 to llvm 3.9.  I traced it back to EH
frames not being deregistered due to a (typo?) mistake in

  void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size)
override {
*    registerEHFramesInProcess(Addr, Size);*

..I overrode the function to call deregister instead of register in my own
MemMgr and all's now well.

The crash manifests itself as a seg fault when a process causes an
exception after JITted code has been removed.


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