1 files changed, 5 insertions, 0 deletions
diff --git a/js/src/vm/BigIntType.h b/js/src/vm/BigIntType.h
index cfc3489934..0ccba99634 100644
--- a/js/src/vm/BigIntType.h
+++ b/js/src/vm/BigIntType.h
@@ -80,6 +80,11 @@ class BigInt final : public js::gc::TenuredCell {
   bool isZero() const { return digitLength() == 0; }
   bool isNegative() const { return lengthSignAndReservedBits_ & SignBit; }
 
+  // Offset for direct access from JIT code.
+  static constexpr size_t offsetOfLengthSignAndReservedBits() {
+    return offsetof(BigInt, lengthSignAndReservedBits_);
+  }
+
   void initializeDigitsToZero();
 
   void traceChildren(JSTracer* trc);