================
@@ -3154,7 +3154,7 @@
AppleObjCRuntimeV2::TaggedPointerVendorExtended::GetClassDescriptor(
<< m_objc_debug_taggedpointer_ext_payload_lshift)
>>
m_objc_debug_taggedpointer_ext_payload_rshift);
int64_t data_payload_signed =
- ((int64_t)((int64_t)unobfuscated
+ ((int64_t)((uint64_t)unobfuscated
<< m_objc_debug_taggedpointer_ext_payload_lshift) >>
----------------
jasonmolenda wrote:
I suspect the runtime gave us these "left & right shift" values, and the person
who wrote this used the obvious implementation. It could be expressed as a bit
slice with a little subtraction, true. Just to be clear, we're not fixing a
real bug here, we were saying a UInt64 was signed and then ubsan got all shirty
when we shifted away some bits that would indicate sign.
https://github.com/llvm/llvm-project/pull/86605
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