[PM/AA] Remove the AliasDebugger pass.

This debugger was designed to catch places where the old update API was
failing to be used correctly. As I've removed the update API, it no
longer serves any purpose. We can introduce new debugging aid passes
around any future work w.r.t. updating AAs.

Note that I've updated the documentation here, but really I need to
rewrite the documentation to carefully spell out the ideas around
stateful AA and how things are changing in the AA world. However, I'm
hoping to do that as a follow-up to the refactoring of the AA
infrastructure to work in both old and new pass managers so that I can
write the documentation specific to that world.

Differential Revision: http://reviews.llvm.org/D11984

llvm-svn: 244825

1 files changed, 0 insertions, 130 deletions

diff --git a/llvm/lib/Analysis/AliasDebugger.cpp b/llvm/lib/Analysis/AliasDebugger.cpp
deleted file mode 100644
index 146036b0060..00000000000
--- a/llvm/lib/Analysis/AliasDebugger.cpp
+++ /dev/null
@@ -1,130 +0,0 @@
-//===- AliasDebugger.cpp - Simple Alias Analysis Use Checker --------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This simple pass checks alias analysis users to ensure that if they
-// create a new value, they do not query AA without informing it of the value.
-// It acts as a shim over any other AA pass you want.
-//
-// Yes keeping track of every value in the program is expensive, but this is 
-// a debugging pass.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include <set>
-using namespace llvm;
-
-namespace {
-  
-  class AliasDebugger : public ModulePass, public AliasAnalysis {
-
-    //What we do is simple.  Keep track of every value the AA could
-    //know about, and verify that queries are one of those.
-    //A query to a value that didn't exist when the AA was created
-    //means someone forgot to update the AA when creating new values
-
-    std::set<const Value*> Vals;
-    
-  public:
-    static char ID; // Class identification, replacement for typeinfo
-    AliasDebugger() : ModulePass(ID) {
-      initializeAliasDebuggerPass(*PassRegistry::getPassRegistry());
-    }
-
-    bool runOnModule(Module &M) override {
-      InitializeAliasAnalysis(this, &M.getDataLayout()); // set up super class
-
-      for(Module::global_iterator I = M.global_begin(),
-            E = M.global_end(); I != E; ++I) {
-        Vals.insert(&*I);
-        for (User::const_op_iterator OI = I->op_begin(),
-             OE = I->op_end(); OI != OE; ++OI)
-          Vals.insert(*OI);
-      }
-
-      for(Module::iterator I = M.begin(),
-            E = M.end(); I != E; ++I){
-        Vals.insert(&*I);
-        if(!I->isDeclaration()) {
-          for (Function::arg_iterator AI = I->arg_begin(), AE = I->arg_end();
-               AI != AE; ++AI) 
-            Vals.insert(&*AI);     
-          for (Function::const_iterator FI = I->begin(), FE = I->end();
-               FI != FE; ++FI) 
-            for (BasicBlock::const_iterator BI = FI->begin(), BE = FI->end();
-                 BI != BE; ++BI) {
-              Vals.insert(&*BI);
-              for (User::const_op_iterator OI = BI->op_begin(),
-                   OE = BI->op_end(); OI != OE; ++OI)
-                Vals.insert(*OI);
-            }
-        }
-        
-      }
-      return false;
-    }
-
-    void getAnalysisUsage(AnalysisUsage &AU) const override {
-      AliasAnalysis::getAnalysisUsage(AU);
-      AU.setPreservesAll();                         // Does not transform code
-    }
-
-    /// getAdjustedAnalysisPointer - This method is used when a pass implements
-    /// an analysis interface through multiple inheritance.  If needed, it
-    /// should override this to adjust the this pointer as needed for the
-    /// specified pass info.
-    void *getAdjustedAnalysisPointer(AnalysisID PI) override {
-      if (PI == &AliasAnalysis::ID)
-        return (AliasAnalysis*)this;
-      return this;
-    }
-    
-    //------------------------------------------------
-    // Implement the AliasAnalysis API
-    //
-    AliasResult alias(const MemoryLocation &LocA,
-                      const MemoryLocation &LocB) override {
-      assert(Vals.find(LocA.Ptr) != Vals.end() &&
-             "Never seen value in AA before");
-      assert(Vals.find(LocB.Ptr) != Vals.end() &&
-             "Never seen value in AA before");
-      return AliasAnalysis::alias(LocA, LocB);
-    }
-
-    ModRefInfo getModRefInfo(ImmutableCallSite CS,
-                             const MemoryLocation &Loc) override {
-      assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
-      return AliasAnalysis::getModRefInfo(CS, Loc);
-    }
-
-    ModRefInfo getModRefInfo(ImmutableCallSite CS1,
-                             ImmutableCallSite CS2) override {
-      return AliasAnalysis::getModRefInfo(CS1,CS2);
-    }
-
-    bool pointsToConstantMemory(const MemoryLocation &Loc,
-                                bool OrLocal) override {
-      assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
-      return AliasAnalysis::pointsToConstantMemory(Loc, OrLocal);
-    }
-  };
-}
-
-char AliasDebugger::ID = 0;
-INITIALIZE_AG_PASS(AliasDebugger, AliasAnalysis, "debug-aa",
-                   "AA use debugger", false, true, false)
-
-Pass *llvm::createAliasDebugger() { return new AliasDebugger(); }
-