This file is indexed.

/usr/include/llvm-3.9/llvm/Analysis/DominanceFrontierImpl.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
//===- llvm/Analysis/DominanceFrontier.h - Dominator Frontiers --*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is the generic implementation of the DominanceFrontier class, which
// calculate and holds the dominance frontier for a function for.
//
// This should be considered deprecated, don't add any more uses of this data
// structure.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ANALYSIS_DOMINANCEFRONTIERIMPL_H
#define LLVM_ANALYSIS_DOMINANCEFRONTIERIMPL_H

#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GenericDomTree.h"

namespace llvm {

template <class BlockT>
class DFCalculateWorkObject {
public:
  typedef DomTreeNodeBase<BlockT> DomTreeNodeT;

  DFCalculateWorkObject(BlockT *B, BlockT *P, const DomTreeNodeT *N,
                        const DomTreeNodeT *PN)
      : currentBB(B), parentBB(P), Node(N), parentNode(PN) {}
  BlockT *currentBB;
  BlockT *parentBB;
  const DomTreeNodeT *Node;
  const DomTreeNodeT *parentNode;
};

template <class BlockT>
void DominanceFrontierBase<BlockT>::removeBlock(BlockT *BB) {
  assert(find(BB) != end() && "Block is not in DominanceFrontier!");
  for (iterator I = begin(), E = end(); I != E; ++I)
    I->second.erase(BB);
  Frontiers.erase(BB);
}

template <class BlockT>
void DominanceFrontierBase<BlockT>::addToFrontier(iterator I,
                                                  BlockT *Node) {
  assert(I != end() && "BB is not in DominanceFrontier!");
  assert(I->second.count(Node) && "Node is not in DominanceFrontier of BB");
  I->second.erase(Node);
}

template <class BlockT>
void DominanceFrontierBase<BlockT>::removeFromFrontier(iterator I,
                                                       BlockT *Node) {
  assert(I != end() && "BB is not in DominanceFrontier!");
  assert(I->second.count(Node) && "Node is not in DominanceFrontier of BB");
  I->second.erase(Node);
}

template <class BlockT>
bool DominanceFrontierBase<BlockT>::compareDomSet(DomSetType &DS1,
                                                  const DomSetType &DS2) const {
  std::set<BlockT *> tmpSet;
  for (BlockT *BB : DS2)
    tmpSet.insert(BB);

  for (typename DomSetType::const_iterator I = DS1.begin(), E = DS1.end();
       I != E;) {
    BlockT *Node = *I++;

    if (tmpSet.erase(Node) == 0)
      // Node is in DS1 but tnot in DS2.
      return true;
  }

  if (!tmpSet.empty()) {
    // There are nodes that are in DS2 but not in DS1.
    return true;
  }

  // DS1 and DS2 matches.
  return false;
}

template <class BlockT>
bool DominanceFrontierBase<BlockT>::compare(
    DominanceFrontierBase<BlockT> &Other) const {
  DomSetMapType tmpFrontiers;
  for (typename DomSetMapType::const_iterator I = Other.begin(),
                                              E = Other.end();
       I != E; ++I)
    tmpFrontiers.insert(std::make_pair(I->first, I->second));

  for (typename DomSetMapType::iterator I = tmpFrontiers.begin(),
                                        E = tmpFrontiers.end();
       I != E;) {
    BlockT *Node = I->first;
    const_iterator DFI = find(Node);
    if (DFI == end())
      return true;

    if (compareDomSet(I->second, DFI->second))
      return true;

    ++I;
    tmpFrontiers.erase(Node);
  }

  if (!tmpFrontiers.empty())
    return true;

  return false;
}

template <class BlockT>
void DominanceFrontierBase<BlockT>::print(raw_ostream &OS) const {
  for (const_iterator I = begin(), E = end(); I != E; ++I) {
    OS << "  DomFrontier for BB ";
    if (I->first)
      I->first->printAsOperand(OS, false);
    else
      OS << " <<exit node>>";
    OS << " is:\t";

    const std::set<BlockT *> &BBs = I->second;

    for (const BlockT *BB : BBs) {
      OS << ' ';
      if (BB)
        BB->printAsOperand(OS, false);
      else
        OS << "<<exit node>>";
    }
    OS << '\n';
  }
}

#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
template <class BlockT>
void DominanceFrontierBase<BlockT>::dump() const {
  print(dbgs());
}
#endif

template <class BlockT>
const typename ForwardDominanceFrontierBase<BlockT>::DomSetType &
ForwardDominanceFrontierBase<BlockT>::calculate(const DomTreeT &DT,
                                                const DomTreeNodeT *Node) {
  BlockT *BB = Node->getBlock();
  DomSetType *Result = nullptr;

  std::vector<DFCalculateWorkObject<BlockT>> workList;
  SmallPtrSet<BlockT *, 32> visited;

  workList.push_back(DFCalculateWorkObject<BlockT>(BB, nullptr, Node, nullptr));
  do {
    DFCalculateWorkObject<BlockT> *currentW = &workList.back();
    assert(currentW && "Missing work object.");

    BlockT *currentBB = currentW->currentBB;
    BlockT *parentBB = currentW->parentBB;
    const DomTreeNodeT *currentNode = currentW->Node;
    const DomTreeNodeT *parentNode = currentW->parentNode;
    assert(currentBB && "Invalid work object. Missing current Basic Block");
    assert(currentNode && "Invalid work object. Missing current Node");
    DomSetType &S = this->Frontiers[currentBB];

    // Visit each block only once.
    if (visited.insert(currentBB).second) {
      // Loop over CFG successors to calculate DFlocal[currentNode]
      for (auto SI = BlockTraits::child_begin(currentBB),
                SE = BlockTraits::child_end(currentBB);
           SI != SE; ++SI) {
        // Does Node immediately dominate this successor?
        if (DT[*SI]->getIDom() != currentNode)
          S.insert(*SI);
      }
    }

    // At this point, S is DFlocal.  Now we union in DFup's of our children...
    // Loop through and visit the nodes that Node immediately dominates (Node's
    // children in the IDomTree)
    bool visitChild = false;
    for (typename DomTreeNodeT::const_iterator NI = currentNode->begin(),
                                               NE = currentNode->end();
         NI != NE; ++NI) {
      DomTreeNodeT *IDominee = *NI;
      BlockT *childBB = IDominee->getBlock();
      if (visited.count(childBB) == 0) {
        workList.push_back(DFCalculateWorkObject<BlockT>(
            childBB, currentBB, IDominee, currentNode));
        visitChild = true;
      }
    }

    // If all children are visited or there is any child then pop this block
    // from the workList.
    if (!visitChild) {
      if (!parentBB) {
        Result = &S;
        break;
      }

      typename DomSetType::const_iterator CDFI = S.begin(), CDFE = S.end();
      DomSetType &parentSet = this->Frontiers[parentBB];
      for (; CDFI != CDFE; ++CDFI) {
        if (!DT.properlyDominates(parentNode, DT[*CDFI]))
          parentSet.insert(*CDFI);
      }
      workList.pop_back();
    }

  } while (!workList.empty());

  return *Result;
}

} // End llvm namespace

#endif