https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277236
John F. Carr <j...@mit.edu> changed:
What |Removed |Added
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CC| |j...@mit.edu
--- Comment #2 from John F. Carr <j...@mit.edu> ---
My first impression is clang is within its rights to break this code. The JS
implementation tries to store metadata bits in the low bits of a pointer type.
The compiler is allowed to assume that the low bits of a pointer value are
zero. (Assuming the pointed-to type has alignment rules, which is normally the
case.) LLVM itself uses a wrapper class instead of an illegal pointer value.
The wrapper class stores the pointer+tag combination as an integer and provides
a getter method to return an untagged pointer.
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