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diff --git a/deps/v8/src/numbers/conversions.h b/deps/v8/src/numbers/conversions.h
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+++ b/deps/v8/src/numbers/conversions.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_NUMBERS_CONVERSIONS_H_
+#define V8_NUMBERS_CONVERSIONS_H_
+
+#include "src/base/logging.h"
+#include "src/common/globals.h"
+#include "src/utils/vector.h"
+
+namespace v8 {
+namespace internal {
+
+class BigInt;
+template <typename T>
+class Handle;
+
+// The limit for the the fractionDigits/precision for toFixed, toPrecision
+// and toExponential.
+const int kMaxFractionDigits = 100;
+
+// The fast double-to-(unsigned-)int conversion routine does not guarantee
+// rounding towards zero.
+// If x is NaN, the result is INT_MIN.  Otherwise the result is the argument x,
+// clamped to [INT_MIN, INT_MAX] and then rounded to an integer.
+inline int FastD2IChecked(double x) {
+  if (!(x >= INT_MIN)) return INT_MIN;  // Negation to catch NaNs.
+  if (x > INT_MAX) return INT_MAX;
+  return static_cast<int>(x);
+}
+
+// The fast double-to-(unsigned-)int conversion routine does not guarantee
+// rounding towards zero.
+// The result is undefined if x is infinite or NaN, or if the rounded
+// integer value is outside the range of type int.
+inline int FastD2I(double x) {
+  DCHECK(x <= INT_MAX);
+  DCHECK(x >= INT_MIN);
+  return static_cast<int32_t>(x);
+}
+
+inline unsigned int FastD2UI(double x);
+
+inline double FastI2D(int x) {
+  // There is no rounding involved in converting an integer to a
+  // double, so this code should compile to a few instructions without
+  // any FPU pipeline stalls.
+  return static_cast<double>(x);
+}
+
+inline double FastUI2D(unsigned x) {
+  // There is no rounding involved in converting an unsigned integer to a
+  // double, so this code should compile to a few instructions without
+  // any FPU pipeline stalls.
+  return static_cast<double>(x);
+}
+
+// This function should match the exact semantics of ECMA-262 20.2.2.17.
+inline float DoubleToFloat32(double x);
+
+// This function should match the exact semantics of ECMA-262 9.4.
+inline double DoubleToInteger(double x);
+
+// This function should match the exact semantics of ECMA-262 9.5.
+inline int32_t DoubleToInt32(double x);
+
+// This function should match the exact semantics of ECMA-262 9.6.
+inline uint32_t DoubleToUint32(double x);
+
+// Enumeration for allowing octals and ignoring junk when converting
+// strings to numbers.
+enum ConversionFlags {
+  NO_FLAGS = 0,
+  ALLOW_HEX = 1,
+  ALLOW_OCTAL = 2,
+  ALLOW_IMPLICIT_OCTAL = 4,
+  ALLOW_BINARY = 8,
+  ALLOW_TRAILING_JUNK = 16
+};
+
+// Converts a string into a double value according to ECMA-262 9.3.1
+double StringToDouble(Vector<const uint8_t> str, int flags,
+                      double empty_string_val = 0);
+double StringToDouble(Vector<const uc16> str, int flags,
+                      double empty_string_val = 0);
+// This version expects a zero-terminated character array.
+double V8_EXPORT_PRIVATE StringToDouble(const char* str, int flags,
+                                        double empty_string_val = 0);
+
+double StringToInt(Isolate* isolate, Handle<String> string, int radix);
+
+// This follows https://tc39.github.io/proposal-bigint/#sec-string-to-bigint
+// semantics: "" => 0n.
+MaybeHandle<BigInt> StringToBigInt(Isolate* isolate, Handle<String> string);
+
+// This version expects a zero-terminated character array. Radix will
+// be inferred from string prefix (case-insensitive):
+//   0x -> hex
+//   0o -> octal
+//   0b -> binary
+V8_EXPORT_PRIVATE MaybeHandle<BigInt> BigIntLiteral(Isolate* isolate,
+                                                    const char* string);
+
+const int kDoubleToCStringMinBufferSize = 100;
+
+// Converts a double to a string value according to ECMA-262 9.8.1.
+// The buffer should be large enough for any floating point number.
+// 100 characters is enough.
+V8_EXPORT_PRIVATE const char* DoubleToCString(double value,
+                                              Vector<char> buffer);
+
+// Convert an int to a null-terminated string. The returned string is
+// located inside the buffer, but not necessarily at the start.
+V8_EXPORT_PRIVATE const char* IntToCString(int n, Vector<char> buffer);
+
+// Additional number to string conversions for the number type.
+// The caller is responsible for calling free on the returned pointer.
+char* DoubleToFixedCString(double value, int f);
+char* DoubleToExponentialCString(double value, int f);
+char* DoubleToPrecisionCString(double value, int f);
+char* DoubleToRadixCString(double value, int radix);
+
+static inline bool IsMinusZero(double value) {
+  return bit_cast<int64_t>(value) == bit_cast<int64_t>(-0.0);
+}
+
+// Returns true if value can be converted to a SMI, and returns the resulting
+// integer value of the SMI in |smi_int_value|.
+inline bool DoubleToSmiInteger(double value, int* smi_int_value);
+
+inline bool IsSmiDouble(double value);
+
+// Integer32 is an integer that can be represented as a signed 32-bit
+// integer. It has to be in the range [-2^31, 2^31 - 1].
+// We also have to check for negative 0 as it is not an Integer32.
+inline bool IsInt32Double(double value);
+
+// UInteger32 is an integer that can be represented as an unsigned 32-bit
+// integer. It has to be in the range [0, 2^32 - 1].
+// We also have to check for negative 0 as it is not a UInteger32.
+inline bool IsUint32Double(double value);
+
+// Tries to convert |value| to a uint32, setting the result in |uint32_value|.
+// If the output does not compare equal to the input, returns false and the
+// value in |uint32_value| is left unspecified.
+// Used for conversions such as in ECMA-262 15.4.2.2, which check "ToUint32(len)
+// is equal to len".
+inline bool DoubleToUint32IfEqualToSelf(double value, uint32_t* uint32_value);
+
+// Convert from Number object to C integer.
+inline uint32_t PositiveNumberToUint32(Object number);
+inline int32_t NumberToInt32(Object number);
+inline uint32_t NumberToUint32(Object number);
+inline int64_t NumberToInt64(Object number);
+inline uint64_t PositiveNumberToUint64(Object number);
+
+double StringToDouble(Isolate* isolate, Handle<String> string, int flags,
+                      double empty_string_val = 0.0);
+
+inline bool TryNumberToSize(Object number, size_t* result);
+
+// Converts a number into size_t.
+inline size_t NumberToSize(Object number);
+
+// returns DoubleToString(StringToDouble(string)) == string
+V8_EXPORT_PRIVATE bool IsSpecialIndex(String string);
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_NUMBERS_CONVERSIONS_H_