<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Matthew,<div><br></div><div>Did you add your alias analysis pass initializeEverythingMustAliasPass() into llvm::initializeAnalysis(<span style="color: rgb(0, 97, 65);">PassRegistry</span> &Registry) {} ?</div><div>This will initialize it linked into the Analysis library.</div><div><br></div><div>thanks,</div><div>chen</div><div> </div><div><div><div>On Apr 28, 2014, at 8:43 PM, Jingyue Wu <<a href="mailto:jingyue@google.com">jingyue@google.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Apr 24, 2014 at 4:38 PM, Matthew O'Connor <span dir="ltr"><<a href="mailto:thegreendragon@gmail.com" target="_blank">thegreendragon@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; position: static; z-index: auto;"><div dir="ltr"><div><div><div><div>Hi,<br><br>I'm attempting to do some alias analysis & other memory inspection. I've written a pointless AliasAnalysis pass (that says everything must alias) to attempt to verify that my pass is getting picked up & run by opt.<br>
<br></div>I run opt with: opt -load ~/Applications/llvm/lib/MustAA.so -must-aa -aa-eval -debug < trace0.ll<br><br></div>I see my pass being initialized, but never being called (I see only may alias results). <br><br></div>
Any ideas as to what to do to debug this? Or what I'm missing? I've read through <a href="http://llvm.org/docs/AliasAnalysis.html" target="_blank">http://llvm.org/docs/AliasAnalysis.html</a> and don't see anything that I'm missing.<br>
<br></div>Thanks,<br>Matthew<br><br>P.S. Here's the full source code of my pass:<br><br>#define DEBUG_TYPE "must-aa"<br>#include "llvm/Pass.h"<br>#include "llvm/Analysis/AliasAnalysis.h"<br>
#include "llvm/Support/raw_ostream.h"<br>#include "llvm/Support/Debug.h"<br>using namespace llvm;<br><br>namespace {<br>struct EverythingMustAlias : public ImmutablePass, public AliasAnalysis {<br> static char ID;<br>
EverythingMustAlias() : ImmutablePass(ID) {}<br><br> virtual void initializePass() {<br> DEBUG(dbgs() << "Initializing everything-must-alias\n");<br> InitializeAliasAnalysis(this);<br> }<br><br>
virtual void getAnalysisUsage(AnalysisUsage &AU) const {<br>
AliasAnalysis::getAnalysisUsage(AU);<br> AU.setPreservesAll();<br> }<br><br> virtual AliasResult alias(const Location &LocA, const Location &LocB) {<br> DEBUG(dbgs() << "Everything must alias!\n");<br>
return AliasAnalysis::MustAlias;<br> }<br>};<br>}<br><br>namespace llvm {<br>void initializeEverythingMustAliasPass(PassRegistry &Registry);<br>}<br><br>char EverythingMustAlias::ID = 0;<br>static RegisterPass<EverythingMustAlias> A("must-aa", "Everything must alias");</div>
</blockquote><div> </div><div>static RegisterPass<EverythingMustAlias> A("must-aa", "Everything must alias", false, true);<br></div><div><br></div><div>Can you try this? </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">
INITIALIZE_AG_PASS(EverythingMustAlias, AliasAnalysis, "must-aa",<br> "Everything must alias", false, true, false)<br><br></div>
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