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must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.8 KiB
C++
139 lines
4.8 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 <set>
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using namespace llvm;
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namespace {
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class AliasDebugger : 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(ID) {
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initializeAliasDebuggerPass(*PassRegistry::getPassRegistry());
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}
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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 (User::const_op_iterator OI = I->op_begin(),
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OE = I->op_end(); OI != OE; ++OI)
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Vals.insert(*OI);
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}
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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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for (User::const_op_iterator OI = BI->op_begin(),
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OE = BI->op_end(); OI != OE; ++OI)
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Vals.insert(*OI);
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}
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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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/// getAdjustedAnalysisPointer - This method is used when a pass implements
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/// an analysis interface through multiple inheritance. If needed, it
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/// should override this to adjust the this pointer as needed for the
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/// specified pass info.
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virtual void *getAdjustedAnalysisPointer(AnalysisID PI) {
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if (PI == &AliasAnalysis::ID)
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return (AliasAnalysis*)this;
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return this;
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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 Location &LocA, const Location &LocB) {
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assert(Vals.find(LocA.Ptr) != Vals.end() &&
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"Never seen value in AA before");
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assert(Vals.find(LocB.Ptr) != Vals.end() &&
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"Never seen value in AA before");
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return AliasAnalysis::alias(LocA, LocB);
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}
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ModRefResult getModRefInfo(ImmutableCallSite CS,
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const Location &Loc) {
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assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::getModRefInfo(CS, Loc);
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}
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ModRefResult getModRefInfo(ImmutableCallSite CS1,
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ImmutableCallSite CS2) {
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return AliasAnalysis::getModRefInfo(CS1,CS2);
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}
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bool pointsToConstantMemory(const Location &Loc) {
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assert(Vals.find(Loc.Ptr) != Vals.end() && "Never seen value in AA before");
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return AliasAnalysis::pointsToConstantMemory(Loc);
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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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}
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char AliasDebugger::ID = 0;
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INITIALIZE_AG_PASS(AliasDebugger, AliasAnalysis, "debug-aa",
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"AA use debugger", false, true, false)
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Pass *llvm::createAliasDebugger() { return new AliasDebugger(); }
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