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//==- GRBlockCounter.h - ADT for counting block visits -------------*- C++ -*-//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines GRBlockCounter, an abstract data type used to count
// the number of times a given block has been visited along a path
// analyzed by GRCoreEngine.
//
//===----------------------------------------------------------------------===//
#include "clang/Checker/PathSensitive/GRBlockCounter.h"
#include "llvm/ADT/ImmutableMap.h"
using namespace clang;
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 (CallSite == RHS.CallSite) ? (BlockID < RHS.BlockID)
: (CallSite < RHS.CallSite);
}
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 GRBlockCounter::getNumVisited(const StackFrameContext *CallSite,
unsigned BlockID) const {
CountMap M = GetMap(Data);
CountMap::data_type* T = M.lookup(CountKey(CallSite, BlockID));
return T ? *T : 0;
}
GRBlockCounter::Factory::Factory(llvm::BumpPtrAllocator& Alloc) {
F = new CountMap::Factory(Alloc);
}
GRBlockCounter::Factory::~Factory() {
delete static_cast<CountMap::Factory*>(F);
}
GRBlockCounter
GRBlockCounter::Factory::IncrementCount(GRBlockCounter BC,
const StackFrameContext *CallSite,
unsigned BlockID) {
return GRBlockCounter(GetFactory(F).Add(GetMap(BC.Data),
CountKey(CallSite, BlockID),
BC.getNumVisited(CallSite, BlockID)+1).getRoot());
}
GRBlockCounter
GRBlockCounter::Factory::GetEmptyCounter() {
return GRBlockCounter(GetFactory(F).GetEmptyMap().getRoot());
}
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