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Accidentally copied from regexp.t
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This is also the subject of perl #123071.
The iteration count was stored in an I32 and was overflowing. If the
maximum number of iterations possible overflowed, then it would become
negative, and the substitution would fail immediately with ‘Substitu-
tion loop’.
I tried fixing this without increasing the size of the context
stack entries on 64-bit builds (by skipping the loop check for long
strings), but was unable to, because we have to return the number of
iterations, which was also stored as I32. If we change just that one
to SSize_t, we get an I32-sized alignment hole, so we might as well
make maxiters a SSize_t as well, fixing the bug that way (the more
straightforward way).
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Exception: t/run/switchI.t, needs the unshift way.
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Using I32 for the fields that record information about the location of
a fixed string that must be found for a regular expression to match
can result in match failures, because I32 is not large enough to store
offsets >= 2**31.
SSize_t is appropriate, since it is 64 bits on 64-bit platforms and 32
bits on 32-bit platforms.
This commit changes enough instances of I32 to SSize_t to get the
added test passing and suppress compiler warnings. A later commit
will change many more.
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Change the internal fields for storing positions so that //g in scalar
context can move past the 2**31 character threshold. Before this com-
mit, the numbers would wrap, resulting in assertion failures.
The changes in this commit are only enough to get the added test pass-
ing. Stay tuned for more.
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This fixes #112790 and part of #116907.
The length of the string is cast to I32, so it wraps and end up less
than the minimum length.
For now, simply skip this optimisation if minlen itself wraps and
becomes negative.
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This is part of #116907, too. It also fixes #72924 as a side effect;
the next commit will explain.
The value of pos($foo) was being stored as an I32, not allowing values
above I32_MAX. Change it to SSize_t (the signed equivalent of size_t,
representing the maximum string length the OS/compiler supports).
This is accomplished by changing the size of the entry in the magic
struct, which is the simplest fix.
Other parts of the code base can benefit from this, too.
We actually cast the pos value to STRLEN (size_t) when reading
it, to allow *very* long strings. Only the value -1 is special,
meaning there is no pos. So the maximum supported offset is
2**sizeof(size_t)-2.
The regexp engine itself still cannot handle large strings, so being
able to set pos to large values is useless right now. This is but one
piece in a larger puzzle.
Changing the size of mg->mg_len also requires that
Perl_hv_placeholders_p change its type. This function
should in fact not be in the API, since it exists
solely to implement the HvPLACEHOLDERS macro. See
<https://rt.perl.org/rt3/Ticket/Display.html?id=116907#txn-1237043>.
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do_vecset() do_vecget() used I32 for the offset, which meant that
offsets outside the -2Gb - +2Gb offset were truncated, resulting in
various misbehaviours.
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