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annotate lib/Analysis/IteratedDominanceFrontier.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents afa8332a0e37
children 803732b1fca8
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1 //===- IteratedDominanceFrontier.cpp - Compute IDF ------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // Compute iterated dominance frontiers using a linear time algorithm.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/Analysis/IteratedDominanceFrontier.h"
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15 #include "llvm/IR/CFG.h"
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16 #include "llvm/IR/Dominators.h"
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17 #include <queue>
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18
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19 namespace llvm {
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20 template <class NodeTy>
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21 void IDFCalculator<NodeTy>::calculate(
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22 SmallVectorImpl<BasicBlock *> &PHIBlocks) {
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23 // If we haven't computed dominator tree levels, do so now.
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24 if (DomLevels.empty()) {
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25 for (auto DFI = df_begin(DT.getRootNode()), DFE = df_end(DT.getRootNode());
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26 DFI != DFE; ++DFI) {
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27 DomLevels[*DFI] = DFI.getPathLength() - 1;
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28 }
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29 }
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30
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31 // Use a priority queue keyed on dominator tree level so that inserted nodes
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32 // are handled from the bottom of the dominator tree upwards.
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33 typedef std::pair<DomTreeNode *, unsigned> DomTreeNodePair;
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34 typedef std::priority_queue<DomTreeNodePair, SmallVector<DomTreeNodePair, 32>,
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35 less_second> IDFPriorityQueue;
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36 IDFPriorityQueue PQ;
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37
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38 for (BasicBlock *BB : *DefBlocks) {
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39 if (DomTreeNode *Node = DT.getNode(BB))
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40 PQ.push(std::make_pair(Node, DomLevels.lookup(Node)));
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41 }
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42
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43 SmallVector<DomTreeNode *, 32> Worklist;
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44 SmallPtrSet<DomTreeNode *, 32> VisitedPQ;
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45 SmallPtrSet<DomTreeNode *, 32> VisitedWorklist;
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46
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47 while (!PQ.empty()) {
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48 DomTreeNodePair RootPair = PQ.top();
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49 PQ.pop();
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50 DomTreeNode *Root = RootPair.first;
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51 unsigned RootLevel = RootPair.second;
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52
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53 // Walk all dominator tree children of Root, inspecting their CFG edges with
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54 // targets elsewhere on the dominator tree. Only targets whose level is at
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55 // most Root's level are added to the iterated dominance frontier of the
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56 // definition set.
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57
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58 Worklist.clear();
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59 Worklist.push_back(Root);
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60 VisitedWorklist.insert(Root);
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61
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62 while (!Worklist.empty()) {
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63 DomTreeNode *Node = Worklist.pop_back_val();
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64 BasicBlock *BB = Node->getBlock();
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65 // Succ is the successor in the direction we are calculating IDF, so it is
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66 // successor for IDF, and predecessor for Reverse IDF.
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67 for (auto SuccIter = GraphTraits<NodeTy>::child_begin(BB),
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68 End = GraphTraits<NodeTy>::child_end(BB);
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69 SuccIter != End; ++SuccIter) {
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70 BasicBlock *Succ = *SuccIter;
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71 DomTreeNode *SuccNode = DT.getNode(Succ);
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72
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73 // Quickly skip all CFG edges that are also dominator tree edges instead
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74 // of catching them below.
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75 if (SuccNode->getIDom() == Node)
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76 continue;
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77
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78 unsigned SuccLevel = DomLevels.lookup(SuccNode);
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79 if (SuccLevel > RootLevel)
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80 continue;
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81
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82 if (!VisitedPQ.insert(SuccNode).second)
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83 continue;
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84
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85 BasicBlock *SuccBB = SuccNode->getBlock();
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86 if (useLiveIn && !LiveInBlocks->count(SuccBB))
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87 continue;
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88
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89 PHIBlocks.emplace_back(SuccBB);
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90 if (!DefBlocks->count(SuccBB))
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91 PQ.push(std::make_pair(SuccNode, SuccLevel));
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92 }
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93
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94 for (auto DomChild : *Node) {
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95 if (VisitedWorklist.insert(DomChild).second)
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96 Worklist.push_back(DomChild);
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97 }
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98 }
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99 }
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100 }
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101
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102 template class IDFCalculator<BasicBlock *>;
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103 template class IDFCalculator<Inverse<BasicBlock *>>;
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104 }