deps: update V8 to 6.5.254.31

PR-URL: https://github.com/nodejs/node/pull/18453
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yang Guo <yangguo@chromium.org>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

1 files changed, 11 insertions, 14 deletions

diff --git a/deps/v8/src/objects/bigint.h b/deps/v8/src/objects/bigint.h
index de0daf495e..9e29a69b3b 100644
--- a/deps/v8/src/objects/bigint.h
+++ b/deps/v8/src/objects/bigint.h
@@ -24,13 +24,19 @@ class BigIntBase : public HeapObject {
     return LengthBits::decode(static_cast<uint32_t>(bitfield));
   }
 
-  // The maximum length that the current implementation supports would be
-  // kMaxInt / kDigitBits. However, we use a lower limit for now, because
-  // raising it later is easier than lowering it.
-  // Support up to 1 million bits.
-  static const int kMaxLengthBits = 1024 * 1024;
+  // Increasing kMaxLength will require code changes.
+  static const int kMaxLengthBits = kMaxInt - kPointerSize * kBitsPerByte - 1;
   static const int kMaxLength = kMaxLengthBits / (kPointerSize * kBitsPerByte);
 
+  static const int kLengthFieldBits = 30;
+  STATIC_ASSERT(kMaxLength <= ((1 << kLengthFieldBits) - 1));
+  class LengthBits : public BitField<int, 0, kLengthFieldBits> {};
+  class SignBits : public BitField<bool, LengthBits::kNext, 1> {};
+
+  static const int kBitfieldOffset = HeapObject::kHeaderSize;
+  static const int kDigitsOffset = kBitfieldOffset + kPointerSize;
+  static const int kHeaderSize = kDigitsOffset;
+
  private:
   friend class BigInt;
   friend class MutableBigInt;
@@ -44,15 +50,6 @@ class BigIntBase : public HeapObject {
   static const int kHalfDigitBits = kDigitBits / 2;
   static const digit_t kHalfDigitMask = (1ull << kHalfDigitBits) - 1;
 
-  static const int kBitfieldOffset = HeapObject::kHeaderSize;
-  static const int kDigitsOffset = kBitfieldOffset + kPointerSize;
-  static const int kHeaderSize = kDigitsOffset;
-
-  static const int kLengthFieldBits = 20;
-  STATIC_ASSERT(kMaxLength <= ((1 << kLengthFieldBits) - 1));
-  class LengthBits : public BitField<int, 0, kLengthFieldBits> {};
-  class SignBits : public BitField<bool, LengthBits::kNext, 1> {};
-
   // sign() == true means negative.
   inline bool sign() const {
     intptr_t bitfield = READ_INTPTR_FIELD(this, kBitfieldOffset);