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diff --git a/deps/v8/src/strings/unicode.h b/deps/v8/src/strings/unicode.h
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+++ b/deps/v8/src/strings/unicode.h
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+// Copyright 2011 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_STRINGS_UNICODE_H_
+#define V8_STRINGS_UNICODE_H_
+
+#include <sys/types.h>
+#include "src/common/globals.h"
+#include "src/third_party/utf8-decoder/utf8-decoder.h"
+#include "src/utils/utils.h"
+/**
+ * \file
+ * Definitions and convenience functions for working with unicode.
+ */
+
+namespace unibrow {
+
+using uchar = unsigned int;
+using byte = unsigned char;
+
+/**
+ * The max length of the result of converting the case of a single
+ * character.
+ */
+const int kMaxMappingSize = 4;
+
+#ifndef V8_INTL_SUPPORT
+template <class T, int size = 256>
+class Predicate {
+ public:
+  inline Predicate() = default;
+  inline bool get(uchar c);
+
+ private:
+  friend class Test;
+  bool CalculateValue(uchar c);
+  class CacheEntry {
+   public:
+    inline CacheEntry()
+        : bit_field_(CodePointField::encode(0) | ValueField::encode(0)) {}
+    inline CacheEntry(uchar code_point, bool value)
+        : bit_field_(
+              CodePointField::encode(CodePointField::kMask & code_point) |
+              ValueField::encode(value)) {
+      DCHECK_IMPLIES((CodePointField::kMask & code_point) != code_point,
+                     code_point == static_cast<uchar>(-1));
+    }
+
+    uchar code_point() const { return CodePointField::decode(bit_field_); }
+    bool value() const { return ValueField::decode(bit_field_); }
+
+   private:
+    class CodePointField : public v8::internal::BitField<uchar, 0, 21> {};
+    class ValueField : public v8::internal::BitField<bool, 21, 1> {};
+
+    uint32_t bit_field_;
+  };
+  static const int kSize = size;
+  static const int kMask = kSize - 1;
+  CacheEntry entries_[kSize];
+};
+
+// A cache used in case conversion.  It caches the value for characters
+// that either have no mapping or map to a single character independent
+// of context.  Characters that map to more than one character or that
+// map differently depending on context are always looked up.
+template <class T, int size = 256>
+class Mapping {
+ public:
+  inline Mapping() = default;
+  inline int get(uchar c, uchar n, uchar* result);
+
+ private:
+  friend class Test;
+  int CalculateValue(uchar c, uchar n, uchar* result);
+  struct CacheEntry {
+    inline CacheEntry() : code_point_(kNoChar), offset_(0) {}
+    inline CacheEntry(uchar code_point, signed offset)
+        : code_point_(code_point), offset_(offset) {}
+    uchar code_point_;
+    signed offset_;
+    static const int kNoChar = (1 << 21) - 1;
+  };
+  static const int kSize = size;
+  static const int kMask = kSize - 1;
+  CacheEntry entries_[kSize];
+};
+
+class UnicodeData {
+ private:
+  friend class Test;
+  static int GetByteCount();
+  static const uchar kMaxCodePoint;
+};
+
+#endif  // !V8_INTL_SUPPORT
+
+class Utf16 {
+ public:
+  static const int kNoPreviousCharacter = -1;
+  static inline bool IsSurrogatePair(int lead, int trail) {
+    return IsLeadSurrogate(lead) && IsTrailSurrogate(trail);
+  }
+  static inline bool IsLeadSurrogate(int code) {
+    return (code & 0xfc00) == 0xd800;
+  }
+  static inline bool IsTrailSurrogate(int code) {
+    return (code & 0xfc00) == 0xdc00;
+  }
+
+  static inline int CombineSurrogatePair(uchar lead, uchar trail) {
+    return 0x10000 + ((lead & 0x3ff) << 10) + (trail & 0x3ff);
+  }
+  static const uchar kMaxNonSurrogateCharCode = 0xffff;
+  // Encoding a single UTF-16 code unit will produce 1, 2 or 3 bytes
+  // of UTF-8 data.  The special case where the unit is a surrogate
+  // trail produces 1 byte net, because the encoding of the pair is
+  // 4 bytes and the 3 bytes that were used to encode the lead surrogate
+  // can be reclaimed.
+  static const int kMaxExtraUtf8BytesForOneUtf16CodeUnit = 3;
+  // One UTF-16 surrogate is endoded (illegally) as 3 UTF-8 bytes.
+  // The illegality stems from the surrogate not being part of a pair.
+  static const int kUtf8BytesToCodeASurrogate = 3;
+  static inline uint16_t LeadSurrogate(uint32_t char_code) {
+    return 0xd800 + (((char_code - 0x10000) >> 10) & 0x3ff);
+  }
+  static inline uint16_t TrailSurrogate(uint32_t char_code) {
+    return 0xdc00 + (char_code & 0x3ff);
+  }
+};
+
+class Latin1 {
+ public:
+  static const uint16_t kMaxChar = 0xff;
+  // Convert the character to Latin-1 case equivalent if possible.
+  static inline uint16_t TryConvertToLatin1(uint16_t c) {
+    switch (c) {
+      // This are equivalent characters in unicode.
+      case 0x39c:
+      case 0x3bc:
+        return 0xb5;
+      // This is an uppercase of a Latin-1 character
+      // outside of Latin-1.
+      case 0x178:
+        return 0xff;
+    }
+    return c;
+  }
+};
+
+class V8_EXPORT_PRIVATE Utf8 {
+ public:
+  using State = Utf8DfaDecoder::State;
+
+  static inline uchar Length(uchar chr, int previous);
+  static inline unsigned EncodeOneByte(char* out, uint8_t c);
+  static inline unsigned Encode(char* out, uchar c, int previous,
+                                bool replace_invalid = false);
+  static uchar CalculateValue(const byte* str, size_t length, size_t* cursor);
+
+  // The unicode replacement character, used to signal invalid unicode
+  // sequences (e.g. an orphan surrogate) when converting to a UTF-8 encoding.
+  static const uchar kBadChar = 0xFFFD;
+  static const uchar kBufferEmpty = 0x0;
+  static const uchar kIncomplete = 0xFFFFFFFC;  // any non-valid code point.
+  static const unsigned kMaxEncodedSize = 4;
+  static const unsigned kMaxOneByteChar = 0x7f;
+  static const unsigned kMaxTwoByteChar = 0x7ff;
+  static const unsigned kMaxThreeByteChar = 0xffff;
+  static const unsigned kMaxFourByteChar = 0x1fffff;
+
+  // A single surrogate is coded as a 3 byte UTF-8 sequence, but two together
+  // that match are coded as a 4 byte UTF-8 sequence.
+  static const unsigned kBytesSavedByCombiningSurrogates = 2;
+  static const unsigned kSizeOfUnmatchedSurrogate = 3;
+  // The maximum size a single UTF-16 code unit may take up when encoded as
+  // UTF-8.
+  static const unsigned kMax16BitCodeUnitSize = 3;
+  static inline uchar ValueOf(const byte* str, size_t length, size_t* cursor);
+
+  using Utf8IncrementalBuffer = uint32_t;
+  static inline uchar ValueOfIncremental(const byte** cursor, State* state,
+                                         Utf8IncrementalBuffer* buffer);
+  static uchar ValueOfIncrementalFinish(State* state);
+
+  // Excludes non-characters from the set of valid code points.
+  static inline bool IsValidCharacter(uchar c);
+
+  // Validate if the input has a valid utf-8 encoding. Unlike JS source code
+  // this validation function will accept any unicode code point, including
+  // kBadChar and BOMs.
+  //
+  // This method checks for:
+  // - valid utf-8 endcoding (e.g. no over-long encodings),
+  // - absence of surrogates,
+  // - valid code point range.
+  static bool ValidateEncoding(const byte* str, size_t length);
+};
+
+struct Uppercase {
+  static bool Is(uchar c);
+};
+struct Letter {
+  static bool Is(uchar c);
+};
+#ifndef V8_INTL_SUPPORT
+struct V8_EXPORT_PRIVATE ID_Start {
+  static bool Is(uchar c);
+};
+struct V8_EXPORT_PRIVATE ID_Continue {
+  static bool Is(uchar c);
+};
+struct V8_EXPORT_PRIVATE WhiteSpace {
+  static bool Is(uchar c);
+};
+#endif  // !V8_INTL_SUPPORT
+
+// LineTerminator:       'JS_Line_Terminator' in point.properties
+// ES#sec-line-terminators lists exactly 4 code points:
+// LF (U+000A), CR (U+000D), LS(U+2028), PS(U+2029)
+V8_INLINE bool IsLineTerminator(uchar c) {
+  return c == 0x000A || c == 0x000D || c == 0x2028 || c == 0x2029;
+}
+
+V8_INLINE bool IsStringLiteralLineTerminator(uchar c) {
+  return c == 0x000A || c == 0x000D;
+}
+
+#ifndef V8_INTL_SUPPORT
+struct ToLowercase {
+  static const int kMaxWidth = 3;
+  static const bool kIsToLower = true;
+  static int Convert(uchar c, uchar n, uchar* result, bool* allow_caching_ptr);
+};
+struct ToUppercase {
+  static const int kMaxWidth = 3;
+  static const bool kIsToLower = false;
+  static int Convert(uchar c, uchar n, uchar* result, bool* allow_caching_ptr);
+};
+struct V8_EXPORT_PRIVATE Ecma262Canonicalize {
+  static const int kMaxWidth = 1;
+  static int Convert(uchar c, uchar n, uchar* result, bool* allow_caching_ptr);
+};
+struct V8_EXPORT_PRIVATE Ecma262UnCanonicalize {
+  static const int kMaxWidth = 4;
+  static int Convert(uchar c, uchar n, uchar* result, bool* allow_caching_ptr);
+};
+struct V8_EXPORT_PRIVATE CanonicalizationRange {
+  static const int kMaxWidth = 1;
+  static int Convert(uchar c, uchar n, uchar* result, bool* allow_caching_ptr);
+};
+#endif  // !V8_INTL_SUPPORT
+
+}  // namespace unibrow
+
+#endif  // V8_STRINGS_UNICODE_H_