1 files changed, 35 insertions, 0 deletions
diff --git a/deps/v8/src/compiler/refs-map.cc b/deps/v8/src/compiler/refs-map.cc
new file mode 100644
index 0000000000..8b176d0e4c
--- /dev/null
+++ b/deps/v8/src/compiler/refs-map.cc
@@ -0,0 +1,35 @@
+// Copyright 2018 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/refs-map.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+using UnderlyingMap =
+    base::TemplateHashMapImpl<Address, ObjectData*, AddressMatcher,
+                              ZoneAllocationPolicy>;
+
+RefsMap::RefsMap(uint32_t capacity, AddressMatcher match, Zone* zone)
+    : UnderlyingMap(capacity, match, ZoneAllocationPolicy(zone)) {}
+
+RefsMap::RefsMap(const RefsMap* other, Zone* zone)
+    : UnderlyingMap(other, ZoneAllocationPolicy(zone)) {}
+
+RefsMap::Entry* RefsMap::Lookup(const Address& key) const {
+  return UnderlyingMap::Lookup(key, Hash(key));
+}
+
+RefsMap::Entry* RefsMap::LookupOrInsert(const Address& key, Zone* zone) {
+  return UnderlyingMap::LookupOrInsert(key, RefsMap::Hash(key),
+                                       []() { return nullptr; },
+                                       ZoneAllocationPolicy(zone));
+}
+
+uint32_t RefsMap::Hash(Address addr) { return static_cast<uint32_t>(addr); }
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8