forked from OSchip/llvm-project
132 lines
4.7 KiB
C++
132 lines
4.7 KiB
C++
//===- AliasDebugger.cpp - Simple Alias Analysis Use Checker --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This simple pass checks alias analysis users to ensure that if they
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// create a new value, they do not query AA without informing it of the value.
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// It acts as a shim over any other AA pass you want.
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//
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// Yes keeping track of every value in the program is expensive, but this is
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// a debugging pass.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Instructions.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Support/Compiler.h"
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#include <set>
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using namespace llvm;
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namespace {
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class VISIBILITY_HIDDEN AliasDebugger
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: public ModulePass, public AliasAnalysis {
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//What we do is simple. Keep track of every value the AA could
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//know about, and verify that queries are one of those.
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//A query to a value that didn't exist when the AA was created
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//means someone forgot to update the AA when creating new values
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std::set<const Value*> Vals;
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public:
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static char ID; // Class identification, replacement for typeinfo
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AliasDebugger() : ModulePass((intptr_t)&ID) {}
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bool runOnModule(Module &M) {
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InitializeAliasAnalysis(this); // set up super class
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for(Module::global_iterator I = M.global_begin(),
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E = M.global_end(); I != E; ++I)
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Vals.insert(&*I);
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for(Module::iterator I = M.begin(),
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E = M.end(); I != E; ++I){
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Vals.insert(&*I);
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if(!I->isDeclaration()) {
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for (Function::arg_iterator AI = I->arg_begin(), AE = I->arg_end();
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AI != AE; ++AI)
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Vals.insert(&*AI);
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for (Function::const_iterator FI = I->begin(), FE = I->end();
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FI != FE; ++FI)
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for (BasicBlock::const_iterator BI = FI->begin(), BE = FI->end();
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BI != BE; ++BI)
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Vals.insert(&*BI);
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}
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}
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AliasAnalysis::getAnalysisUsage(AU);
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AU.setPreservesAll(); // Does not transform code
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}
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//------------------------------------------------
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// Implement the AliasAnalysis API
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//
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AliasResult alias(const Value *V1, unsigned V1Size,
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const Value *V2, unsigned V2Size) {
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assert(Vals.find(V1) != Vals.end() && "Never seen value in AA before");
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assert(Vals.find(V2) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::alias(V1, V1Size, V2, V2Size);
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}
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ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
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assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::getModRefInfo(CS, P, Size);
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}
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ModRefResult getModRefInfo(CallSite CS1, CallSite CS2) {
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return AliasAnalysis::getModRefInfo(CS1,CS2);
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}
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void getMustAliases(Value *P, std::vector<Value*> &RetVals) {
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assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::getMustAliases(P, RetVals);
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}
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bool pointsToConstantMemory(const Value *P) {
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assert(Vals.find(P) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::pointsToConstantMemory(P);
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}
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/// getModRefBehavior - Return the behavior of the specified function if
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/// called from the specified call site. The call site may be null in which
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/// case the most generic behavior of this function should be returned.
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virtual ModRefBehavior getModRefBehavior(Function *F, CallSite CS,
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std::vector<PointerAccessInfo> *Info) {
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assert(Vals.find(F) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::getModRefBehavior(F, CS, Info);
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}
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virtual void deleteValue(Value *V) {
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assert(Vals.find(V) != Vals.end() && "Never seen value in AA before");
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AliasAnalysis::deleteValue(V);
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}
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virtual void copyValue(Value *From, Value *To) {
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Vals.insert(To);
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AliasAnalysis::copyValue(From, To);
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}
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};
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char AliasDebugger::ID = 0;
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RegisterPass<AliasDebugger> X("debug-aa", "AA use debugger", false, true);
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RegisterAnalysisGroup<AliasAnalysis> Y(X);
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}
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Pass *llvm::createAliasDebugger() { return new AliasDebugger(); }
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