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https://github.com/c64scene-ar/llvm-6502.git
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ac17c4d9b5
part of simplifying its interface and usage in preparation for porting to work with the new pass manager. Note that this will likely expose that we have dead arguments, members, and maybe even pass requirements for AA. I'll be cleaning those up in seperate patches. This just zaps the actual update API. Differential Revision: http://reviews.llvm.org/D11325 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242881 91177308-0d34-0410-b5e6-96231b3b80d8
131 lines
4.6 KiB
C++
131 lines
4.6 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/Analysis/AliasAnalysis.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.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) override {
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InitializeAliasAnalysis(this, &M.getDataLayout()); // 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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void getAnalysisUsage(AnalysisUsage &AU) const override {
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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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void *getAdjustedAnalysisPointer(AnalysisID PI) override {
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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 MemoryLocation &LocA,
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const MemoryLocation &LocB) override {
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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 MemoryLocation &Loc) override {
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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) override {
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return AliasAnalysis::getModRefInfo(CS1,CS2);
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}
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bool pointsToConstantMemory(const MemoryLocation &Loc,
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bool OrLocal) override {
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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, OrLocal);
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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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