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Explicit node for static symbol (addresses). Should not break with edge
cases like the previous ad-hoc approach. And some other bugfixes
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- frontend: __builtin_bswapX intrinsics
- backend: ObswapX instructions
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Because envdecls (now declsbuf) can be resized and invalidate those
pointers. I missed this because the default initialization size of that
buffer (and the fact that it would mostly only manifest with
function-local expressions) made it not really come up in practice.
Silly
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Can't figure out what's wrong with the change to struct expr from 9721d6ba40
but it makes valgrind complain and causes miscompilation of the compiler
itself..
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Interned strings are used pervasively, so it's a good idea to add a
layer of type safety to differentiate them from general cstrs and avoid
potential bugs from comparing non-interned and interned strings. Not
that that's happened so far that I can remember, but it could.
I'm 90% sure it's legal to alias `struct {char c;}` pointers with `char`
pointers. This specific typedef gives type safety but with a simple
one-way `internstr -> const char *` typecast (with `&istr->c`).
Converting the other way around is more intentional: a straight up cast
`(internstr)cstr` which sticks out as unchecked and probably wrong, or
calling the intern(cstr) function, which is the right way.
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