[llvm] r297971 - Salvage debug info from instructions about to be deleted

[Adrian Prantl via llvm-commits]

Is there a bot that catches this or otherwise any instructions to reproduce this?

thanks,
adrian

> On Mar 16, 2017, at 1:13 PM, Evgenii Stepanov <eugeni.stepanov at gmail.com> wrote:
> 
> Hi,
> 
> ninja check-msan on linux/x86_64 has started using unlimited memory
> and I suspect this change.
> One common allocation is
> 
> #9 0x00007f40f6cfae0d operator new(unsigned long)
> /build/gcc-4.8-mW1ufQ/gcc-4.8-4.8.4/build/x86_64-linux-gnu/libstdc++-v3/libsupc++/../../../../src/libstdc++-v3/libsupc++/new_op.cc:56:0
> #10 0x00000000017e3a8d llvm::DIExpression::getImpl(llvm::LLVMContext&,
> llvm::ArrayRef<unsigned long>, llvm::Metadata::StorageType, bool)
> (/code/build-llvm/bin/clang-5.0+0x17e3a8d)
> #11 0x0000000001dae195 prependDIExpr(llvm::DIBuilder&,
> llvm::DIExpression*, bool, long)
> (/code/build-llvm/bin/clang-5.0+0x1dae195)
> #12 0x0000000001db539b std::_Function_handler<void
> (llvm::DbgValueInst&),
> llvm::salvageDebugInfo(llvm::Instruction&)::$_2>::_M_invoke(std::_Any_data
> const&, llvm::DbgValueInst&)
> (/code/build-llvm/bin/clang-5.0+0x1db539b)
> #13 0x0000000001dade35 llvm::findDbgValues(llvm::Value*,
> std::function<void (llvm::DbgValueInst&)>)
> (/code/build-llvm/bin/clang-5.0+0x1dade35)
> #14 0x0000000001dae7f6 llvm::salvageDebugInfo(llvm::Instruction&)
> (/code/build-llvm/bin/clang-5.0+0x1dae7f6)
> #15 0x0000000001961964
> llvm::InstCombiner::eraseInstFromFunction(llvm::Instruction&)
> (/code/build-llvm/bin/clang-5.0+0x1961964)
> #16 0x000000000196deb5 llvm::InstCombiner::run()
> (/code/build-llvm/bin/clang-5.0+0x196deb5)
> 
>