1//==- BlockCounter.h - ADT for counting block visits -------------*- C++ -*-//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file defines BlockCounter, an abstract data type used to count
11//  the number of times a given block has been visited along a path
12//  analyzed by CoreEngine.
13//
14//===----------------------------------------------------------------------===//
15
16#include "clang/StaticAnalyzer/Core/PathSensitive/BlockCounter.h"
17#include "llvm/ADT/ImmutableMap.h"
18
19using namespace clang;
20using namespace ento;
21
22namespace {
23
24class CountKey {
25  const StackFrameContext *CallSite;
26  unsigned BlockID;
27
28public:
29  CountKey(const StackFrameContext *CS, unsigned ID)
30    : CallSite(CS), BlockID(ID) {}
31
32  bool operator==(const CountKey &RHS) const {
33    return (CallSite == RHS.CallSite) && (BlockID == RHS.BlockID);
34  }
35
36  bool operator<(const CountKey &RHS) const {
37    return std::tie(CallSite, BlockID) < std::tie(RHS.CallSite, RHS.BlockID);
38  }
39
40  void Profile(llvm::FoldingSetNodeID &ID) const {
41    ID.AddPointer(CallSite);
42    ID.AddInteger(BlockID);
43  }
44};
45
46}
47
48typedef llvm::ImmutableMap<CountKey, unsigned> CountMap;
49
50static inline CountMap GetMap(void *D) {
51  return CountMap(static_cast<CountMap::TreeTy*>(D));
52}
53
54static inline CountMap::Factory& GetFactory(void *F) {
55  return *static_cast<CountMap::Factory*>(F);
56}
57
58unsigned BlockCounter::getNumVisited(const StackFrameContext *CallSite,
59                                       unsigned BlockID) const {
60  CountMap M = GetMap(Data);
61  CountMap::data_type* T = M.lookup(CountKey(CallSite, BlockID));
62  return T ? *T : 0;
63}
64
65BlockCounter::Factory::Factory(llvm::BumpPtrAllocator& Alloc) {
66  F = new CountMap::Factory(Alloc);
67}
68
69BlockCounter::Factory::~Factory() {
70  delete static_cast<CountMap::Factory*>(F);
71}
72
73BlockCounter
74BlockCounter::Factory::IncrementCount(BlockCounter BC,
75                                        const StackFrameContext *CallSite,
76                                        unsigned BlockID) {
77  return BlockCounter(GetFactory(F).add(GetMap(BC.Data),
78                                          CountKey(CallSite, BlockID),
79                             BC.getNumVisited(CallSite, BlockID)+1).getRoot());
80}
81
82BlockCounter
83BlockCounter::Factory::GetEmptyCounter() {
84  return BlockCounter(GetFactory(F).getEmptyMap().getRoot());
85}
86