1 files changed, 48 insertions, 0 deletions
diff --git a/deps/v8/src/compiler/all-nodes.cc b/deps/v8/src/compiler/all-nodes.cc
new file mode 100644
index 0000000000..b055a68c08
--- /dev/null
+++ b/deps/v8/src/compiler/all-nodes.cc
@@ -0,0 +1,48 @@
+// Copyright 2014 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 "src/compiler/all-nodes.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+AllNodes::AllNodes(Zone* local_zone, const Graph* graph)
+    : live(local_zone),
+      gray(local_zone),
+      state(graph->NodeCount(), AllNodes::kDead, local_zone) {
+  Node* end = graph->end();
+  state[end->id()] = AllNodes::kLive;
+  live.push_back(end);
+  // Find all live nodes reachable from end.
+  for (size_t i = 0; i < live.size(); i++) {
+    for (Node* const input : live[i]->inputs()) {
+      if (input == nullptr) {
+        // TODO(titzer): print a warning.
+        continue;
+      }
+      if (input->id() >= graph->NodeCount()) {
+        // TODO(titzer): print a warning.
+        continue;
+      }
+      if (state[input->id()] != AllNodes::kLive) {
+        live.push_back(input);
+        state[input->id()] = AllNodes::kLive;
+      }
+    }
+  }
+
+  // Find all nodes that are not reachable from end that use live nodes.
+  for (size_t i = 0; i < live.size(); i++) {
+    for (Node* const use : live[i]->uses()) {
+      if (state[use->id()] == AllNodes::kDead) {
+        gray.push_back(use);
+        state[use->id()] = AllNodes::kGray;
+      }
+    }
+  }
+}
+}
+}
+}  // namespace v8::internal::compiler