[LLVMdev] PLEASE help with Alias Analysis initialization assertion at the end of my pass

[Griffin Wright]

Hello all,

I really, really, really need your help.  This is my third email now,
please don't ignore me!  I understand this must be a trivial thing, but
I've ground to a halt, and REALLY need some guidance.  Please see below for
the context of my problem.  I'm not trying to be a waste of time, but I'm
desperate here.

I have a getAnalysisUsage method which does the following (excerpted): 
void RelRecovery::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AliasAnalysis> (); } 

and then a runOnFunction method which does this: 

bool RelRecovery::runOnFunction(Function &F) { AA =
&getAnalysis<AliasAnalysis> (); } 

This is the same setup as with a bunch of other analyses (LoopInfo,
ProfileInfo, etc) and they all work fine. I've read that AA needs a call to
InitializeAliasAnalysis(this) in the main run method (in my case,
runOnFunction), and I'm wondering how to properly implement it, since the
parameter is supposed to be a Pass. 

Thank you!

-Griffin

On Mon, 23 Jan 2012 14:54:43 -0500, Griffin Wright <grwright at umich.edu>
wrote:

    Hello all, I am working with someone else's LLVM code, which is about 8
months old. Part of this pass involves AliasAnalysis, and I'm getting the
above assertion when the pass completes. The dump is as follows: 

-------------------------------- 
Program received signal SIGABRT, Aborted. 0xf7fdf430 in __kernel_vsyscall
() (gdb) bt #0 0xf7fdf430 in __kernel_vsyscall () #1 0xf602e921 in
*__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 #2
0xf6031d52 in *__GI_abort () at abort.c:92 #3 0xf6027788 in
*__GI___assert_fail (assertion=0xf78ef62c "AA && \"AA didn't call
InitializeAliasAnalysis in its run method!\"", file=0xf78ef5f0
"/x/grwright/llvm/llvm-2.9/lib/Analysis/AliasAnalysis.cpp", line=59,
function=0xf78f0e40 "virtual void
llvm::AliasAnalysis::deleteValue(llvm::Value*)") at assert.c:81 #4
0xf6c37686 in llvm::AliasAnalysis::deleteValue (this=0x81848d0,
V=0x8147000) at 

/x/grwright/llvm/llvm-2.9/lib/Analysis/AliasAnalysis.cpp:59

    #5 0xf6c47153 in llvm::AliasSetTracker::deleteValue (this=0x823ab58,
PtrVal=0x8147000) at
/x/grwright/llvm/llvm-2.9/lib/Analysis/AliasSetTracker.cpp:505 #6
0xf6c47ae6 in llvm::AliasSetTracker::ASTCallbackVH::deleted
(this=0x8233ce8) at
/x/grwright/llvm/llvm-2.9/lib/Analysis/AliasSetTracker.cpp:619 #7
0xf72b9d2f in llvm::ValueHandleBase::ValueIsDeleted (V=0x8147000) at
/x/grwright/llvm/llvm-2.9/lib/VMCore/Value.cpp:557 #8 0xf72b81ec in ~Value
(this=0x8147000, __in_chrg=<value optimized 

out>)

    at /x/grwright/llvm/llvm-2.9/lib/VMCore/Value.cpp:60 #9 0xf6f4b041 in
~User (this=0x8147000, __in_chrg=<value optimized out>) at
/x/grwright/llvm/llvm-2.9/include/llvm/User.h:62 #10 0xf725dd89 in
~Instruction (this=0x8147000, __in_chrg=<value 

optimized

    out>) at /x/grwright/llvm/llvm-2.9/lib/VMCore/Instruction.cpp:54 #11
0xf7275461 in ~GetElementPtrInst (this=0x8147000, __in_chrg=<value
optimized out>) at
/x/grwright/llvm/llvm-2.9/include/llvm/Instructions.h:285 #12 0xf7136671 in
llvm::ilist_node_traits<llvm::Instruction>::deleteNode (V=0x8147000) at
/x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:112 #13 0xf7135c80 in
llvm::iplist<llvm::Instruction, llvm::ilist_traits<llvm::Instruction>
>::erase (this=0x8145d14, 

where=...)

    at /x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:463 #14
0xf71c7c37 in llvm::iplist<llvm::Instruction,
llvm::ilist_traits<llvm::Instruction> >::erase (this=0x8145d14, 

first=...,

    last=...) at /x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:528 #15
0xf71c77a0 in llvm::iplist<llvm::Instruction,
llvm::ilist_traits<llvm::Instruction> >::clear (this=0x8145d14) at
/x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:532 #16 0xf71c6420 in
~BasicBlock (this=0x8145cf8, __in_chrg=<value optimized out>) at
/x/grwright/llvm/llvm-2.9/lib/VMCore/BasicBlock.cpp:82 #17 0xf71c7db2 in
llvm::ilist_node_traits<llvm::BasicBlock>::deleteNode (V=0x8145cf8) at
/x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:112 #18 0xf71c79a8 in
llvm::iplist<llvm::BasicBlock, llvm::ilist_traits<llvm::BasicBlock>
>::erase (this=0x80be818, where=...) at
/x/grwright/llvm/llvm-2.9/include/llvm/ADT/ilist.h:463 #19 0xf71c658f in
llvm::BasicBlock::eraseFromParent (this=0x8145cf8) at
/x/grwright/llvm/llvm-2.9/lib/VMCore/BasicBlock.cpp:101 #20 0xf7214b11 in
llvm::Function::dropAllReferences (this=0x80be7e8) at
/x/grwright/llvm/llvm-2.9/lib/VMCore/Function.cpp:233 #21 0xf728ac59 in
llvm::Module::dropAllReferences (this=0x80a9690) at
/x/grwright/llvm/llvm-2.9/lib/VMCore/Module.cpp:449 #22 0xf7289af2 in
~Module (this=0x80a9690, __in_chrg=<value optimized 

out>)

    at /x/grwright/llvm/llvm-2.9/lib/VMCore/Module.cpp:70 #23 0x08081e36 in
~auto_ptr (this=0xffffd734, __in_chrg=<value optimized out>) at
/usr/include/c++/4.4/backward/auto_ptr.h:168 #24 0x0807d5a4 in main
(argc=13, argv=0xffffd814) at
/x/grwright/llvm/llvm-2.9/tools/opt/opt.cpp:695
--------------------------------