[LLVMdev] weird issue with mem2reg

Patrick Meredith pmeredit at uiuc.edu
Wed Jun 23 16:06:07 PDT 2004 

----- Original Message ----- 
From: "Chris Lattner" <sabre at nondot.org>
To: <llvmdev at cs.uiuc.edu>
Sent: Wednesday, June 23, 2004 4:05 PM
Subject: Re: [LLVMdev] weird issue with mem2reg


> On Wed, 23 Jun 2004, Patrick Meredith wrote:
>
> > MetaSplit is an anlysis I just finished writing.  It doesn't alter
anything,
> > all it does is build a set of "program instructions".  For some reason
even
> > though if I run it with any other combination of passes I've found,
anytime
> > I run it with mem2reg I get a seg fault in dyn_cast!  Here's output:
> >
> > Starting program:
> > /mounts/zion/disks/0/localhome/pmeredit/llvm/tools/Debug/opt -load
> > ../Debug/libmetasplit.so -mem2reg -metasplit < test3.s.bc > out.bc
>
> This is a crash in your pass.  Try running:
>
> opt -mem2reg test3.s.bc -o tmp.bc
> opt -load ... -metasplit tmp.bc -o out.bc

I've already tried that and yes it crashes ;)

> I suspect that it will still crash in only your pass (aka, the bug is
> yours :)
>
> Regardless I recommend trying out bugpoint for something like this.  Try
> running:
>
> bugpoint -load ... -mem2reg -metasplit test3.s.bc
>
> and it will probably tell you what I just did, and give you a better
> testcase. :)
>
> -Chris
>
>
> > Program received signal SIGSEGV, Segmentation fault.
> > 0x083b6a22 in llvm::isa_impl_wrap<llvm::Instruction, llvm::Value const,
> > llvm::Value const>::doit(llvm::Value const&) (Val=@0x894e850)
> >     at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:69
> > 69          return isa_impl<To,FromTy>(Val);
> > (gdb) bt
> > #0  0x083b6a22 in llvm::isa_impl_wrap<llvm::Instruction, llvm::Value
const,
> > llvm::Value const>::doit(llvm::Value const&) (Val=@0x894e850)
> >     at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:69
> > #1  0x083b69f7 in isa<llvm::Instruction> (Val=@0x894e850) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:80
> > #2  0x083b693f in isa<llvm::Instruction> (Val=@0x894e850) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:90
> > #3  0x083b6673 in isa<llvm::Instruction> (Val=0x894e850) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:99
> > #4  0x083b6379 in isa<llvm::Instruction, const llvm::Value*>
> > (Val=@0xbf8000c0) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:114
> > #5  0x083b608f in llvm::CallInst::classof(llvm::Value const*)
(V=0x894e850)
> > at
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/llvm/iOther.h:110
> > #6  0x08499213 in isa_impl<llvm::CallInst, llvm::Value> (Val=@0x894e850)
at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:52
> > #7  0x08499157 in llvm::isa_impl_wrap<llvm::CallInst, llvm::Value const,
> > llvm::Value const>::doit(llvm::Value const&) (Val=@0x894e850)
> >     at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:69
> > #8  0x08498ea7 in isa<llvm::CallInst> (Val=@0x894e850) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:80
> > #9  0x08498b79 in isa<llvm::CallInst> (Val=0x894e850) at
> >
/mounts/zion/disks/0/localhome/pmeredit/llvm/include/Support/Casting.h:99
> > #10 0x4001d1f6 in isa<llvm::CallInst> (Val=@0xbf800170) at
> > /localhome/pmeredit/llvm/include/Support/Casting.h:90
> > #11 0x4001cfb3 in llvm::isa_impl_wrap<llvm::CallInst, llvm::Use const,
> > llvm::Value*>::doit(llvm::Use const&) (Val=@0xbf800200)
> >     at /localhome/pmeredit/llvm/include/Support/Casting.h:60
> > #12 0x4001ca1c in isa<llvm::CallInst> (Val=@0xbf800200) at
> > /localhome/pmeredit/llvm/include/Support/Casting.h:80
> > #13 0x4001c1ca in isa<llvm::CallInst, llvm::Use> (Val=@0xbf800200) at
> > /localhome/pmeredit/llvm/include/Support/Casting.h:114
> > #14 0x4001baaa in dyn_cast<llvm::CallInst, llvm::Use> (Val={Val =
0x894e850,
> > U = 0x8917e48, Prev = 0x895a240, Next = 0x894e880})
> >     at /localhome/pmeredit/llvm/include/Support/Casting.h:223
> > #15 0x4001af72 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8917e48) at MetaSplit.cpp:79
> > #16 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x895ff40) at MetaSplit.cpp:88
> > #17 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #18 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #19 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #20 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #21 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #22 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #23 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #24 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #25 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #26 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #27 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> > #28 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x89609a8) at MetaSplit.cpp:88
> > #29 0x4001b049 in (anonymous
> > namespace)::MetaSplit::handleProgramUses(llvm::Value*) (this=0x893e998,
> > V=0x8930610) at MetaSplit.cpp:88
> >
> >
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
>
> -Chris
>
> -- 
> http://llvm.cs.uiuc.edu/
> http://www.nondot.org/~sabre/Projects/
>
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