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annotate unittests/ADT/SCCIteratorTest.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 //===----- llvm/unittest/ADT/SCCIteratorTest.cpp - SCCIterator tests ------===//
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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 #include "llvm/ADT/SCCIterator.h"
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11 #include "gtest/gtest.h"
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12 #include "TestGraph.h"
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13 #include <limits.h>
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14
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15 using namespace llvm;
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16
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17 namespace llvm {
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18
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19 TEST(SCCIteratorTest, AllSmallGraphs) {
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20 // Test SCC computation against every graph with NUM_NODES nodes or less.
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21 // Since SCC considers every node to have an implicit self-edge, we only
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22 // create graphs for which every node has a self-edge.
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23 #define NUM_NODES 4
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24 #define NUM_GRAPHS (NUM_NODES * (NUM_NODES - 1))
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25 typedef Graph<NUM_NODES> GT;
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26
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27 /// Enumerate all graphs using NUM_GRAPHS bits.
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28 static_assert(NUM_GRAPHS < sizeof(unsigned) * CHAR_BIT, "Too many graphs!");
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29 for (unsigned GraphDescriptor = 0; GraphDescriptor < (1U << NUM_GRAPHS);
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30 ++GraphDescriptor) {
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31 GT G;
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32
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33 // Add edges as specified by the descriptor.
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34 unsigned DescriptorCopy = GraphDescriptor;
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35 for (unsigned i = 0; i != NUM_NODES; ++i)
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36 for (unsigned j = 0; j != NUM_NODES; ++j) {
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37 // Always add a self-edge.
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38 if (i == j) {
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39 G.AddEdge(i, j);
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40 continue;
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41 }
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42 if (DescriptorCopy & 1)
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43 G.AddEdge(i, j);
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44 DescriptorCopy >>= 1;
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45 }
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46
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47 // Test the SCC logic on this graph.
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48
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49 /// NodesInSomeSCC - Those nodes which are in some SCC.
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50 GT::NodeSubset NodesInSomeSCC;
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51
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52 for (scc_iterator<GT> I = scc_begin(G), E = scc_end(G); I != E; ++I) {
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53 const std::vector<GT::NodeType *> &SCC = *I;
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54
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55 // Get the nodes in this SCC as a NodeSubset rather than a vector.
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56 GT::NodeSubset NodesInThisSCC;
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57 for (unsigned i = 0, e = SCC.size(); i != e; ++i)
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58 NodesInThisSCC.AddNode(SCC[i]->first);
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59
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60 // There should be at least one node in every SCC.
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61 EXPECT_FALSE(NodesInThisSCC.isEmpty());
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62
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63 // Check that every node in the SCC is reachable from every other node in
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64 // the SCC.
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65 for (unsigned i = 0; i != NUM_NODES; ++i)
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66 if (NodesInThisSCC.count(i))
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67 EXPECT_TRUE(NodesInThisSCC.isSubsetOf(G.NodesReachableFrom(i)));
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68
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69 // OK, now that we now that every node in the SCC is reachable from every
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70 // other, this means that the set of nodes reachable from any node in the
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71 // SCC is the same as the set of nodes reachable from every node in the
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72 // SCC. Check that for every node N not in the SCC but reachable from the
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73 // SCC, no element of the SCC is reachable from N.
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74 for (unsigned i = 0; i != NUM_NODES; ++i)
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75 if (NodesInThisSCC.count(i)) {
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76 GT::NodeSubset NodesReachableFromSCC = G.NodesReachableFrom(i);
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77 GT::NodeSubset ReachableButNotInSCC =
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78 NodesReachableFromSCC.Meet(NodesInThisSCC.Complement());
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79
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80 for (unsigned j = 0; j != NUM_NODES; ++j)
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81 if (ReachableButNotInSCC.count(j))
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82 EXPECT_TRUE(G.NodesReachableFrom(j).Meet(NodesInThisSCC).isEmpty());
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83
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84 // The result must be the same for all other nodes in this SCC, so
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85 // there is no point in checking them.
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86 break;
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87 }
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88
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89 // This is indeed a SCC: a maximal set of nodes for which each node is
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90 // reachable from every other.
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91
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92 // Check that we didn't already see this SCC.
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93 EXPECT_TRUE(NodesInSomeSCC.Meet(NodesInThisSCC).isEmpty());
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94
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95 NodesInSomeSCC = NodesInSomeSCC.Join(NodesInThisSCC);
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96
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97 // Check a property that is specific to the LLVM SCC iterator and
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98 // guaranteed by it: if a node in SCC S1 has an edge to a node in
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99 // SCC S2, then S1 is visited *after* S2. This means that the set
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100 // of nodes reachable from this SCC must be contained either in the
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101 // union of this SCC and all previously visited SCC's.
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102
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103 for (unsigned i = 0; i != NUM_NODES; ++i)
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104 if (NodesInThisSCC.count(i)) {
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105 GT::NodeSubset NodesReachableFromSCC = G.NodesReachableFrom(i);
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106 EXPECT_TRUE(NodesReachableFromSCC.isSubsetOf(NodesInSomeSCC));
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107 // The result must be the same for all other nodes in this SCC, so
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108 // there is no point in checking them.
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109 break;
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110 }
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111 }
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112
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113 // Finally, check that the nodes in some SCC are exactly those that are
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114 // reachable from the initial node.
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115 EXPECT_EQ(NodesInSomeSCC, G.NodesReachableFrom(0));
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116 }
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117 }
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118
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119 }