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test/cctest/compiler/test-node-algorithm.cc

Index: test/cctest/compiler/test-node-algorithm.cc
diff --git a/test/cctest/compiler/test-node-algorithm.cc b/test/cctest/compiler/test-node-algorithm.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ac8fbb9200969b1af32bb5286ebeca8f43a22604
--- /dev/null
+++ b/test/cctest/compiler/test-node-algorithm.cc
@@ -0,0 +1,330 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <vector>
+
+#include "src/v8.h"
+
+#include "graph-tester.h"
+#include "src/compiler/common-operator.h"
+#include "src/compiler/generic-node.h"
+#include "src/compiler/generic-node-inl.h"
+#include "src/compiler/graph.h"
+#include "src/compiler/graph-inl.h"
+#include "src/compiler/graph-visualizer.h"
+#include "src/compiler/operator.h"
+
+using namespace v8::internal;
+using namespace v8::internal::compiler;
+
+static SimpleOperator dummy_operator(IrOpcode::kParameter, Operator::kNoWrite,
+                                     0, 0, "dummy");
+
+class PreNodeVisitor : public NullNodeVisitor {
+ public:
+  GenericGraphVisit::Control Pre(Node* node) {
+    printf("NODE ID: %d\n", node->id());
+    nodes_.push_back(node);
+    return GenericGraphVisit::CONTINUE;
+  }
+  std::vector<Node*> nodes_;
+};
+
+
+class PostNodeVisitor : public NullNodeVisitor {
+ public:
+  GenericGraphVisit::Control Post(Node* node) {
+    printf("NODE ID: %d\n", node->id());
+    nodes_.push_back(node);
+    return GenericGraphVisit::CONTINUE;
+  }
+  std::vector<Node*> nodes_;
+};
+
+
+TEST(TestUseNodeVisitEmpty) {
+  GraphWithStartNodeTester graph;
+
+  PreNodeVisitor node_visitor;
+  graph.VisitNodeUsesFromStart(&node_visitor);
+
+  CHECK_EQ(1, node_visitor.nodes_.size());
+}
+
+
+TEST(TestUseNodePreOrderVisitSimple) {
+  GraphWithStartNodeTester graph;
+  Node* n2 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n3 = graph.NewNode(&dummy_operator, n2);
+  Node* n4 = graph.NewNode(&dummy_operator, n2, n3);
+  Node* n5 = graph.NewNode(&dummy_operator, n4, n2);
+  graph.SetEnd(n5);
+
+  PreNodeVisitor node_visitor;
+  graph.VisitNodeUsesFromStart(&node_visitor);
+
+  CHECK_EQ(5, node_visitor.nodes_.size());
+  CHECK(graph.start()->id() == node_visitor.nodes_[0]->id());
+  CHECK(n2->id() == node_visitor.nodes_[1]->id());
+  CHECK(n3->id() == node_visitor.nodes_[2]->id());
+  CHECK(n4->id() == node_visitor.nodes_[3]->id());
+  CHECK(n5->id() == node_visitor.nodes_[4]->id());
+}
+
+
+TEST(TestInputNodePreOrderVisitSimple) {
+  GraphWithStartNodeTester graph;
+  Node* n2 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n3 = graph.NewNode(&dummy_operator, n2);
+  Node* n4 = graph.NewNode(&dummy_operator, n2, n3);
+  Node* n5 = graph.NewNode(&dummy_operator, n4, n2);
+  graph.SetEnd(n5);
+
+  PreNodeVisitor node_visitor;
+  graph.VisitNodeInputsFromEnd(&node_visitor);
+  CHECK_EQ(5, node_visitor.nodes_.size());
+  CHECK(n5->id() == node_visitor.nodes_[0]->id());
+  CHECK(n4->id() == node_visitor.nodes_[1]->id());
+  CHECK(n2->id() == node_visitor.nodes_[2]->id());
+  CHECK(graph.start()->id() == node_visitor.nodes_[3]->id());
+  CHECK(n3->id() == node_visitor.nodes_[4]->id());
+}
+
+
+TEST(TestUseNodePostOrderVisitSimple) {
+  GraphWithStartNodeTester graph;
+  Node* n2 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n3 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n4 = graph.NewNode(&dummy_operator, n2);
+  Node* n5 = graph.NewNode(&dummy_operator, n2);
+  Node* n6 = graph.NewNode(&dummy_operator, n2);
+  Node* n7 = graph.NewNode(&dummy_operator, n3);
+  Node* end_dependencies[4] = {n4, n5, n6, n7};
+  Node* n8 = graph.NewNode(&dummy_operator, 4, end_dependencies);
+  graph.SetEnd(n8);
+
+  PostNodeVisitor node_visitor;
+  graph.VisitNodeUsesFromStart(&node_visitor);
+
+  CHECK_EQ(8, node_visitor.nodes_.size());
+  CHECK(graph.end()->id() == node_visitor.nodes_[0]->id());
+  CHECK(n4->id() == node_visitor.nodes_[1]->id());
+  CHECK(n5->id() == node_visitor.nodes_[2]->id());
+  CHECK(n6->id() == node_visitor.nodes_[3]->id());
+  CHECK(n2->id() == node_visitor.nodes_[4]->id());
+  CHECK(n7->id() == node_visitor.nodes_[5]->id());
+  CHECK(n3->id() == node_visitor.nodes_[6]->id());
+  CHECK(graph.start()->id() == node_visitor.nodes_[7]->id());
+}
+
+
+TEST(TestUseNodePostOrderVisitLong) {
+  GraphWithStartNodeTester graph;
+  Node* n2 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n3 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n4 = graph.NewNode(&dummy_operator, n2);
+  Node* n5 = graph.NewNode(&dummy_operator, n2);
+  Node* n6 = graph.NewNode(&dummy_operator, n3);
+  Node* n7 = graph.NewNode(&dummy_operator, n3);
+  Node* n8 = graph.NewNode(&dummy_operator, n5);
+  Node* n9 = graph.NewNode(&dummy_operator, n5);
+  Node* n10 = graph.NewNode(&dummy_operator, n9);
+  Node* n11 = graph.NewNode(&dummy_operator, n9);
+  Node* end_dependencies[6] = {n4, n8, n10, n11, n6, n7};
+  Node* n12 = graph.NewNode(&dummy_operator, 6, end_dependencies);
+  graph.SetEnd(n12);
+
+  PostNodeVisitor node_visitor;
+  graph.VisitNodeUsesFromStart(&node_visitor);
+
+  CHECK_EQ(12, node_visitor.nodes_.size());
+  CHECK(graph.end()->id() == node_visitor.nodes_[0]->id());
+  CHECK(n4->id() == node_visitor.nodes_[1]->id());
+  CHECK(n8->id() == node_visitor.nodes_[2]->id());
+  CHECK(n10->id() == node_visitor.nodes_[3]->id());
+  CHECK(n11->id() == node_visitor.nodes_[4]->id());
+  CHECK(n9->id() == node_visitor.nodes_[5]->id());
+  CHECK(n5->id() == node_visitor.nodes_[6]->id());
+  CHECK(n2->id() == node_visitor.nodes_[7]->id());
+  CHECK(n6->id() == node_visitor.nodes_[8]->id());
+  CHECK(n7->id() == node_visitor.nodes_[9]->id());
+  CHECK(n3->id() == node_visitor.nodes_[10]->id());
+  CHECK(graph.start()->id() == node_visitor.nodes_[11]->id());
+}
+
+
+TEST(TestUseNodePreOrderVisitCycle) {
+  GraphWithStartNodeTester graph;
+  Node* n0 = graph.start_node();
+  Node* n1 = graph.NewNode(&dummy_operator, n0);
+  Node* n2 = graph.NewNode(&dummy_operator, n1);
+  n0->AppendInput(graph.main_zone(), n2);
+  graph.SetStart(n0);
+  graph.SetEnd(n2);
+
+  PreNodeVisitor node_visitor;
+  graph.VisitNodeUsesFromStart(&node_visitor);
+
+  CHECK_EQ(3, node_visitor.nodes_.size());
+  CHECK(n0->id() == node_visitor.nodes_[0]->id());
+  CHECK(n1->id() == node_visitor.nodes_[1]->id());
+  CHECK(n2->id() == node_visitor.nodes_[2]->id());
+}
+
+
+struct ReenterNodeVisitor : NullNodeVisitor {
+  GenericGraphVisit::Control Pre(Node* node) {
+    printf("[%d] PRE NODE: %d\n", static_cast<int>(nodes_.size()), node->id());
+    nodes_.push_back(node->id());
+    int size = nodes_.size();
+    switch (node->id()) {
+      case 0:
+        return size < 6 ? GenericGraphVisit::REENTER : GenericGraphVisit::SKIP;
+      case 1:
+        return size < 4 ? GenericGraphVisit::DEFER
+                        : GenericGraphVisit::CONTINUE;
+      default:
+        return GenericGraphVisit::REENTER;
+    }
+  }
+
+  GenericGraphVisit::Control Post(Node* node) {
+    printf("[%d] POST NODE: %d\n", static_cast<int>(nodes_.size()), node->id());
+    nodes_.push_back(-node->id());
+    return node->id() == 4 ? GenericGraphVisit::REENTER
+                           : GenericGraphVisit::CONTINUE;
+  }
+
+  void PreEdge(Node* from, int index, Node* to) {
+    printf("[%d] PRE EDGE: %d-%d\n", static_cast<int>(edges_.size()),
+           from->id(), to->id());
+    edges_.push_back(std::make_pair(from->id(), to->id()));
+  }
+
+  void PostEdge(Node* from, int index, Node* to) {
+    printf("[%d] POST EDGE: %d-%d\n", static_cast<int>(edges_.size()),
+           from->id(), to->id());
+    edges_.push_back(std::make_pair(-from->id(), -to->id()));
+  }
+
+  std::vector<int> nodes_;
+  std::vector<std::pair<int, int> > edges_;
+};
+
+
+TEST(TestUseNodeReenterVisit) {
+  GraphWithStartNodeTester graph;
+  Node* n0 = graph.start_node();
+  Node* n1 = graph.NewNode(&dummy_operator, n0);
+  Node* n2 = graph.NewNode(&dummy_operator, n0);
+  Node* n3 = graph.NewNode(&dummy_operator, n2);
+  Node* n4 = graph.NewNode(&dummy_operator, n0);
+  Node* n5 = graph.NewNode(&dummy_operator, n4);
+  n0->AppendInput(graph.main_zone(), n3);
+  graph.SetStart(n0);
+  graph.SetEnd(n5);
+
+  ReenterNodeVisitor visitor;
+  graph.VisitNodeUsesFromStart(&visitor);
+
+  CHECK_EQ(22, visitor.nodes_.size());
+  CHECK_EQ(24, visitor.edges_.size());
+
+  CHECK(n0->id() == visitor.nodes_[0]);
+  CHECK(n0->id() == visitor.edges_[0].first);
+  CHECK(n1->id() == visitor.edges_[0].second);
+  CHECK(n1->id() == visitor.nodes_[1]);
+  // N1 is deferred.
+  CHECK(-n1->id() == visitor.edges_[1].second);
+  CHECK(-n0->id() == visitor.edges_[1].first);
+  CHECK(n0->id() == visitor.edges_[2].first);
+  CHECK(n2->id() == visitor.edges_[2].second);
+  CHECK(n2->id() == visitor.nodes_[2]);
+  CHECK(n2->id() == visitor.edges_[3].first);
+  CHECK(n3->id() == visitor.edges_[3].second);
+  CHECK(n3->id() == visitor.nodes_[3]);
+  // Circle back to N0, which we may reenter for now.
+  CHECK(n3->id() == visitor.edges_[4].first);
+  CHECK(n0->id() == visitor.edges_[4].second);
+  CHECK(n0->id() == visitor.nodes_[4]);
+  CHECK(n0->id() == visitor.edges_[5].first);
+  CHECK(n1->id() == visitor.edges_[5].second);
+  CHECK(n1->id() == visitor.nodes_[5]);
+  // This time N1 is no longer deferred.
+  CHECK(-n1->id() == visitor.nodes_[6]);
+  CHECK(-n1->id() == visitor.edges_[6].second);
+  CHECK(-n0->id() == visitor.edges_[6].first);
+  CHECK(n0->id() == visitor.edges_[7].first);
+  CHECK(n2->id() == visitor.edges_[7].second);
+  CHECK(n2->id() == visitor.nodes_[7]);
+  CHECK(n2->id() == visitor.edges_[8].first);
+  CHECK(n3->id() == visitor.edges_[8].second);
+  CHECK(n3->id() == visitor.nodes_[8]);
+  CHECK(n3->id() == visitor.edges_[9].first);
+  CHECK(n0->id() == visitor.edges_[9].second);
+  CHECK(n0->id() == visitor.nodes_[9]);
+  // This time we break at N0 and skip it.
+  CHECK(-n0->id() == visitor.edges_[10].second);
+  CHECK(-n3->id() == visitor.edges_[10].first);
+  CHECK(-n3->id() == visitor.nodes_[10]);
+  CHECK(-n3->id() == visitor.edges_[11].second);
+  CHECK(-n2->id() == visitor.edges_[11].first);
+  CHECK(-n2->id() == visitor.nodes_[11]);
+  CHECK(-n2->id() == visitor.edges_[12].second);
+  CHECK(-n0->id() == visitor.edges_[12].first);
+  CHECK(n0->id() == visitor.edges_[13].first);
+  CHECK(n4->id() == visitor.edges_[13].second);
+  CHECK(n4->id() == visitor.nodes_[12]);
+  CHECK(n4->id() == visitor.edges_[14].first);
+  CHECK(n5->id() == visitor.edges_[14].second);
+  CHECK(n5->id() == visitor.nodes_[13]);
+  CHECK(-n5->id() == visitor.nodes_[14]);
+  CHECK(-n5->id() == visitor.edges_[15].second);
+  CHECK(-n4->id() == visitor.edges_[15].first);
+  CHECK(-n4->id() == visitor.nodes_[15]);
+  CHECK(-n4->id() == visitor.edges_[16].second);
+  CHECK(-n0->id() == visitor.edges_[16].first);
+  CHECK(-n0->id() == visitor.nodes_[16]);
+  CHECK(-n0->id() == visitor.edges_[17].second);
+  CHECK(-n3->id() == visitor.edges_[17].first);
+  CHECK(-n3->id() == visitor.nodes_[17]);
+  CHECK(-n3->id() == visitor.edges_[18].second);
+  CHECK(-n2->id() == visitor.edges_[18].first);
+  CHECK(-n2->id() == visitor.nodes_[18]);
+  CHECK(-n2->id() == visitor.edges_[19].second);
+  CHECK(-n0->id() == visitor.edges_[19].first);
+  // N4 may be reentered.
+  CHECK(n0->id() == visitor.edges_[20].first);
+  CHECK(n4->id() == visitor.edges_[20].second);
+  CHECK(n4->id() == visitor.nodes_[19]);
+  CHECK(n4->id() == visitor.edges_[21].first);
+  CHECK(n5->id() == visitor.edges_[21].second);
+  CHECK(-n5->id() == visitor.edges_[22].second);
+  CHECK(-n4->id() == visitor.edges_[22].first);
+  CHECK(-n4->id() == visitor.nodes_[20]);
+  CHECK(-n4->id() == visitor.edges_[23].second);
+  CHECK(-n0->id() == visitor.edges_[23].first);
+  CHECK(-n0->id() == visitor.nodes_[21]);
+}
+
+
+TEST(TestPrintNodeGraphToNodeGraphviz) {
+  GraphWithStartNodeTester graph;
+  Node* n2 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n3 = graph.NewNode(&dummy_operator, graph.start());
+  Node* n4 = graph.NewNode(&dummy_operator, n2);
+  Node* n5 = graph.NewNode(&dummy_operator, n2);
+  Node* n6 = graph.NewNode(&dummy_operator, n3);
+  Node* n7 = graph.NewNode(&dummy_operator, n3);
+  Node* n8 = graph.NewNode(&dummy_operator, n5);
+  Node* n9 = graph.NewNode(&dummy_operator, n5);
+  Node* n10 = graph.NewNode(&dummy_operator, n9);
+  Node* n11 = graph.NewNode(&dummy_operator, n9);
+  Node* end_dependencies[6] = {n4, n8, n10, n11, n6, n7};
+  Node* n12 = graph.NewNode(&dummy_operator, 6, end_dependencies);
+  graph.SetEnd(n12);
+
+  OFStream os(stdout);
+  os << AsDOT(graph);
+}