1 files changed, 60 insertions, 0 deletions
diff --git a/deps/v8/src/codegen/external-reference-encoder.h b/deps/v8/src/codegen/external-reference-encoder.h
new file mode 100644
index 00000000000..7c41206f07f
--- /dev/null
+++ b/deps/v8/src/codegen/external-reference-encoder.h
@@ -0,0 +1,60 @@
+// Copyright 2020 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.
+
+#ifndef V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
+#define V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_
+
+#include "src/base/bit-field.h"
+#include "src/common/globals.h"
+#include "src/utils/address-map.h"
+
+namespace v8 {
+namespace internal {
+
+class Isolate;
+
+class ExternalReferenceEncoder {
+ public:
+  class Value {
+   public:
+    explicit Value(uint32_t raw) : value_(raw) {}
+    Value() : value_(0) {}
+    static uint32_t Encode(uint32_t index, bool is_from_api) {
+      return Index::encode(index) | IsFromAPI::encode(is_from_api);
+    }
+
+    bool is_from_api() const { return IsFromAPI::decode(value_); }
+    uint32_t index() const { return Index::decode(value_); }
+
+   private:
+    using Index = base::BitField<uint32_t, 0, 31>;
+    using IsFromAPI = base::BitField<bool, 31, 1>;
+    uint32_t value_;
+  };
+
+  explicit ExternalReferenceEncoder(Isolate* isolate);
+#ifdef DEBUG
+  ~ExternalReferenceEncoder();
+#endif  // DEBUG
+
+  Value Encode(Address key);
+  Maybe<Value> TryEncode(Address key);
+
+  const char* NameOfAddress(Isolate* isolate, Address address) const;
+
+ private:
+  AddressToIndexHashMap* map_;
+
+#ifdef DEBUG
+  std::vector<int> count_;
+  const intptr_t* api_references_;
+#endif  // DEBUG
+
+  DISALLOW_COPY_AND_ASSIGN(ExternalReferenceEncoder);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODEGEN_EXTERNAL_REFERENCE_ENCODER_H_