From d7f01911b8a2cb056583bbfa50554df97bb35936 Mon Sep 17 00:00:00 2001
From: Moonchild <moonchild@palemoon.org>
Date: Tue, 22 Apr 2025 15:26:41 +0200
Subject: [PATCH] Issue #2731 - Fix crashes on unknown BigInt types in JIT

This only works around the unknown type crashes but doesn't actually fix
attempts at using 64-bit BigInts in Ion.
Resolves #2731
---
 js/src/jit/MacroAssembler.cpp | 1 +
 js/src/jit/MacroAssembler.h   | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/js/src/jit/MacroAssembler.cpp b/js/src/jit/MacroAssembler.cpp
index 6721dd4419..9519e8f0eb 100644
--- a/js/src/jit/MacroAssembler.cpp
+++ b/js/src/jit/MacroAssembler.cpp
@@ -2124,6 +2124,7 @@ MacroAssembler::convertTypedOrValueToInt(TypedOrValueRegister src, FloatRegister
       case MIRType::String:
       case MIRType::Symbol:
       case MIRType::Object:
+      case MIRType::BigInt:
         jump(fail);
         break;
       default:
diff --git a/js/src/jit/MacroAssembler.h b/js/src/jit/MacroAssembler.h
index f681456396..e5efb475c6 100644
--- a/js/src/jit/MacroAssembler.h
+++ b/js/src/jit/MacroAssembler.h
@@ -1622,6 +1622,11 @@ class MacroAssembler : public MacroAssemblerSpecific
           case Scalar::Uint32:
             store32(value, dest);
             break;
+          case Scalar::BigInt64:
+          case Scalar::BigUint64:
+            //FIXME: storing 64-bit values doesn't actually work yet.
+            // store64(value, dest);
+            break;
           default:
             MOZ_CRASH("Invalid typed array type");
         }