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Make *allocx() size class overflow behavior defined.

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Limit supported size and alignment to HUGE_MAXCLASS, which in turn is
now limited to be less than PTRDIFF_MAX.

This resolves #278 and #295.
This commit is contained in:
Jason Evans 2016-02-25 15:29:49 -08:00
parent 767d85061a
commit 0c516a00c4
14 changed files with 247 additions and 89 deletions
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25
test/unit/size_classes.c
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@ -80,10 +80,33 @@ TEST_BEGIN(test_size_classes)
}
TEST_END
TEST_BEGIN(test_overflow)
{
size_t max_size_class;
max_size_class = get_max_size_class();
assert_u_ge(size2index(max_size_class+1), NSIZES,
"size2index() should return >= NSIZES on overflow");
assert_u_ge(size2index(PTRDIFF_MAX+1), NSIZES,
"size2index() should return >= NSIZES on overflow");
assert_u_ge(size2index(SIZE_T_MAX), NSIZES,
"size2index() should return >= NSIZES on overflow");
assert_zu_gt(s2u(max_size_class+1), HUGE_MAXCLASS,
"s2u() should return > HUGE_MAXCLASS for unsupported size");
assert_zu_gt(s2u(PTRDIFF_MAX+1), HUGE_MAXCLASS,
"s2u() should return > HUGE_MAXCLASS for unsupported size");
assert_zu_eq(s2u(SIZE_T_MAX), 0,
"s2u() should return 0 on overflow");
}
TEST_END
int
main(void)
{
return (test(
test_size_classes));
test_size_classes,
test_overflow));
}