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//==- BlockCounter.h - ADT for counting block visits -------------*- C++ -*-//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines BlockCounter, an abstract data type used to count
// the number of times a given block has been visited along a path
// analyzed by CoreEngine.
//
//===----------------------------------------------------------------------===//
#include "clang/StaticAnalyzer/Core/PathSensitive/BlockCounter.h"
#include "llvm/ADT/ImmutableMap.h"
using namespace clang;
using namespace ento;
namespace {
class CountKey {
const StackFrameContext *CallSite;
unsigned BlockID;
public:
CountKey(const StackFrameContext *CS, unsigned ID)
: CallSite(CS), BlockID(ID) {}
bool operator==(const CountKey &RHS) const {
return (CallSite == RHS.CallSite) && (BlockID == RHS.BlockID);
}
bool operator<(const CountKey &RHS) const {
return std::tie(CallSite, BlockID) < std::tie(RHS.CallSite, RHS.BlockID);
}
void Profile(llvm::FoldingSetNodeID &ID) const {
ID.AddPointer(CallSite);
ID.AddInteger(BlockID);
}
};
}
typedef llvm::ImmutableMap<CountKey, unsigned> CountMap;
static inline CountMap GetMap(void *D) {
return CountMap(static_cast<CountMap::TreeTy*>(D));
}
static inline CountMap::Factory& GetFactory(void *F) {
return *static_cast<CountMap::Factory*>(F);
}
unsigned BlockCounter::getNumVisited(const StackFrameContext *CallSite,
unsigned BlockID) const {
CountMap M = GetMap(Data);
CountMap::data_type* T = M.lookup(CountKey(CallSite, BlockID));
return T ? *T : 0;
}
BlockCounter::Factory::Factory(llvm::BumpPtrAllocator& Alloc) {
F = new CountMap::Factory(Alloc);
}
BlockCounter::Factory::~Factory() {
delete static_cast<CountMap::Factory*>(F);
}
BlockCounter
BlockCounter::Factory::IncrementCount(BlockCounter BC,
const StackFrameContext *CallSite,
unsigned BlockID) {
return BlockCounter(GetFactory(F).add(GetMap(BC.Data),
CountKey(CallSite, BlockID),
BC.getNumVisited(CallSite, BlockID)+1).getRoot());
}
BlockCounter
BlockCounter::Factory::GetEmptyCounter() {
return BlockCounter(GetFactory(F).getEmptyMap().getRoot());
}
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