AssumptionCache.cpp [plain text]
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
using namespace llvm::PatternMatch;
void AssumptionCache::scanFunction() {
assert(!Scanned && "Tried to scan the function twice!");
assert(AssumeHandles.empty() && "Already have assumes when scanning!");
for (BasicBlock &B : F)
for (Instruction &II : B)
if (match(&II, m_Intrinsic<Intrinsic::assume>()))
AssumeHandles.push_back(&II);
Scanned = true;
}
void AssumptionCache::registerAssumption(CallInst *CI) {
assert(match(CI, m_Intrinsic<Intrinsic::assume>()) &&
"Registered call does not call @llvm.assume");
if (!Scanned)
return;
AssumeHandles.push_back(CI);
#ifndef NDEBUG
assert(CI->getParent() &&
"Cannot register @llvm.assume call not in a basic block");
assert(&F == CI->getParent()->getParent() &&
"Cannot register @llvm.assume call not in this function");
SmallPtrSet<Value *, 16> AssumptionSet;
for (auto &VH : AssumeHandles) {
if (!VH)
continue;
assert(&F == cast<Instruction>(VH)->getParent()->getParent() &&
"Cached assumption not inside this function!");
assert(match(cast<CallInst>(VH), m_Intrinsic<Intrinsic::assume>()) &&
"Cached something other than a call to @llvm.assume!");
assert(AssumptionSet.insert(VH).second &&
"Cache contains multiple copies of a call!");
}
#endif
}
char AssumptionAnalysis::PassID;
PreservedAnalyses AssumptionPrinterPass::run(Function &F,
AnalysisManager<Function> *AM) {
AssumptionCache &AC = AM->getResult<AssumptionAnalysis>(F);
OS << "Cached assumptions for function: " << F.getName() << "\n";
for (auto &VH : AC.assumptions())
if (VH)
OS << " " << *cast<CallInst>(VH)->getArgOperand(0) << "\n";
return PreservedAnalyses::all();
}
void AssumptionCacheTracker::FunctionCallbackVH::deleted() {
auto I = ACT->AssumptionCaches.find_as(cast<Function>(getValPtr()));
if (I != ACT->AssumptionCaches.end())
ACT->AssumptionCaches.erase(I);
}
AssumptionCache &AssumptionCacheTracker::getAssumptionCache(Function &F) {
auto I = AssumptionCaches.find_as(&F);
if (I != AssumptionCaches.end())
return *I->second;
auto IP = AssumptionCaches.insert(std::make_pair(
FunctionCallbackVH(&F, this), llvm::make_unique<AssumptionCache>(F)));
assert(IP.second && "Scanning function already in the map?");
return *IP.first->second;
}
void AssumptionCacheTracker::verifyAnalysis() const {
#ifndef NDEBUG
SmallPtrSet<const CallInst *, 4> AssumptionSet;
for (const auto &I : AssumptionCaches) {
for (auto &VH : I.second->assumptions())
if (VH)
AssumptionSet.insert(cast<CallInst>(VH));
for (const BasicBlock &B : cast<Function>(*I.first))
for (const Instruction &II : B)
if (match(&II, m_Intrinsic<Intrinsic::assume>()))
assert(AssumptionSet.count(cast<CallInst>(&II)) &&
"Assumption in scanned function not in cache");
}
#endif
}
AssumptionCacheTracker::AssumptionCacheTracker() : ImmutablePass(ID) {
initializeAssumptionCacheTrackerPass(*PassRegistry::getPassRegistry());
}
AssumptionCacheTracker::~AssumptionCacheTracker() {}
INITIALIZE_PASS(AssumptionCacheTracker, "assumption-cache-tracker",
"Assumption Cache Tracker", false, true)
char AssumptionCacheTracker::ID = 0;