Changes in directory llvm/lib/Analysis:
AliasDebugger.cpp added (r1.1)
---
Log message:
A shim over other AA impls to catch incorrect uses
---
Diffs of the changes: (+125 -0)
AliasDebugger.cpp | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 125 insertions(+)
Index: llvm/lib/Analysis/AliasDebugger.cpp
diff -c /dev/null llvm/lib/Analysis/AliasDebugger.cpp:1.1
*** /dev/null Mon Nov 13 23:20:38 2006
--- llvm/lib/Analysis/AliasDebugger.cpp Mon Nov 13 23:20:28 2006
***************
*** 0 ****
--- 1,125 ----
+ //===- AliasDebugger.cpp - Simple Alias Analysis Use Checker
--------------===//
+ //
+ // The LLVM Compiler Infrastructure
+ //
+ // This file was developed by Andrew Lenharth and 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/Module.h"
+ #include "llvm/Pass.h"
+ #include "llvm/Instructions.h"
+ #include "llvm/Constants.h"
+ #include "llvm/DerivedTypes.h"
+ #include "llvm/Analysis/AliasAnalysis.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:
+ bool runOnModule(Module &M) {
+ InitializeAliasAnalysis(this); // set up super class
+
+ for(Module::global_iterator I = M.global_begin(),
+ E = M.global_end(); I != E; ++I)
+ Vals.insert(&*I);
+
+ for(Module::iterator I = M.begin(),
+ E = M.end(); I != E; ++I){
+ Vals.insert(&*I);
+ if(!I->isExternal()) {
+ 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);
+ }
+
+ }
+ return false;
+ }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AliasAnalysis::getAnalysisUsage(AU);
+ AU.setPreservesAll(); // Does not transform code
+ }
+
+ //------------------------------------------------
+ // Implement the AliasAnalysis API
+ //
+ AliasResult alias(const Value *V1, unsigned V1Size,
+ const Value *V2, unsigned V2Size) {
+ assert(Vals.find(V1) != Vals.end() && "Never seen value in AA before");
+ assert(Vals.find(V2) != Vals.end() && "Never seen value in AA before");
+ return AliasAnalysis::alias(V1, V1Size, V2, V2Size);
+ }
+
+ ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
+ assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
+ return AliasAnalysis::getModRefInfo(CS, P, Size);
+ }
+
+ ModRefResult getModRefInfo(CallSite CS1, CallSite CS2) {
+ return AliasAnalysis::getModRefInfo(CS1,CS2);
+ }
+
+ void getMustAliases(Value *P, std::vector<Value*> &RetVals) {
+ assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
+ return AliasAnalysis::getMustAliases(P, RetVals);
+ }
+
+ bool pointsToConstantMemory(const Value *P) {
+ assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
+ return AliasAnalysis::pointsToConstantMemory(P);
+ }
+
+ /// getModRefBehavior - Return the behavior of the specified function if
+ /// called from the specified call site. The call site may be null in
which
+ /// case the most generic behavior of this function should be returned.
+ virtual ModRefBehavior getModRefBehavior(Function *F, CallSite CS,
+ std::vector<PointerAccessInfo>
*Info) {
+ assert(Vals.find(F) != Vals.end() && "Never seen value in AA before");
+ return AliasAnalysis::getModRefBehavior(F, CS, Info);
+ }
+
+ virtual void deleteValue(Value *V) {
+ assert(Vals.find(V) != Vals.end() && "Never seen value in AA before");
+ AliasAnalysis::deleteValue(V);
+ }
+ virtual void copyValue(Value *From, Value *To) {
+ Vals.insert(To);
+ AliasAnalysis::copyValue(From, To);
+ }
+
+ };
+
+ RegisterPass<AliasDebugger> X("debug-aa", "AA use debugger");
+ RegisterAnalysisGroup<AliasAnalysis> Y(X);
+ }
+
+ Pass *llvm::createAliasDebugger() { return new AliasDebugger(); }
+
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