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Refactor use of sizeclasses (#415)

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The primary aim for this refactor is to use a representation for
sizeclasses that uniformly covers both large and small.  This allows
certain operations such as alloc_size and external_pointer to be
uniformly implemented.

The additional types make clear which kind of sizeclass is in use.

This also tidies up the code for sizeclass based divisible by and
modulus.

It fixes a bug in rust_realloc that didn't correctly determine a realloc
was required for large classes.
This commit is contained in:
Matthew Parkinson
2021-11-10 16:35:44 +00:00
committed by GitHub
parent 02f36a4b31
commit 3d403aef7f
19 changed files with 465 additions and 273 deletions
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22
src/test/func/release-rounding/rounding.cc
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@@ -17,35 +17,37 @@ int main(int argc, char** argv)
bool failed = false;
for (size_t size_class = 0; size_class < NUM_SIZECLASSES; size_class++)
for (size_t size_class = 0; size_class < NUM_SMALL_SIZECLASSES; size_class++)
{
size_t rsize = sizeclass_to_size((uint8_t)size_class);
size_t max_offset = sizeclass_to_slab_size(size_class);
sizeclass_t sc = sizeclass_t::from_small_class(size_class);
for (size_t offset = 0; offset < max_offset; offset++)
{
size_t rounded = (offset / rsize) * rsize;
size_t mod = offset % rsize;
bool mod_0 = (offset % rsize) == 0;
size_t opt_rounded = round_by_sizeclass(size_class, offset);
if (rounded != opt_rounded)
size_t opt_mod = index_in_object(sc, offset);
if (mod != opt_mod)
{
std::cout << "rsize " << rsize << " offset " << offset << " opt "
<< opt_rounded << " correct " << rounded << std::endl
<< opt_mod << " correct " << mod << std::endl
<< std::flush;
failed = true;
}
bool opt_mod_0 = is_multiple_of_sizeclass(size_class, offset);
bool opt_mod_0 = divisible_by_sizeclass(size_class, offset);
if (opt_mod_0 != mod_0)
{
std::cout << "rsize " << rsize << " offset " << offset << " opt_mod "
<< opt_mod_0 << " correct " << mod_0 << std::endl
std::cout << "rsize " << rsize << " offset " << offset
<< " opt_mod0 " << opt_mod_0 << " correct " << mod_0
<< std::endl
<< std::flush;
failed = true;
}
}
if (failed)
abort();
}
if (failed)
abort();
return 0;
}