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fix memory corruption in old GCC

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This typo introduced memory corruption when __builtin_add_overflow
is not available but uint128_t is.  GCC before 5 are one of such
situatins.

See also 20191009T120004Z.log.html.gz
This commit is contained in:
卜部昌平 2019-10-10 00:10:14 +09:00
parent bb71a128eb
commit 9b919885a0
2 changed files with 1 additions and 2 deletions
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1
bootstraptest/test_insns.rb
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@ -427,7 +427,6 @@ tests.compact.each do |(insn, expr, *a)|
end end
end end
# with trace # with trace
tests.compact.each {|(insn, expr, *a)| tests.compact.each {|(insn, expr, *a)|
progn = "set_trace_func(proc{})\n" + expr progn = "set_trace_func(proc{})\n" + expr

2
gc.c
View file

@ -135,7 +135,7 @@ size_add_overflow(size_t x, size_t y)
#elif defined(DSIZE_T) #elif defined(DSIZE_T)
RB_GNUC_EXTENSION DSIZE_T dx = x; RB_GNUC_EXTENSION DSIZE_T dx = x;
RB_GNUC_EXTENSION DSIZE_T dy = x; RB_GNUC_EXTENSION DSIZE_T dy = y;
RB_GNUC_EXTENSION DSIZE_T dz = dx + dy; RB_GNUC_EXTENSION DSIZE_T dz = dx + dy;
p = dz > SIZE_MAX; p = dz > SIZE_MAX;
z = (size_t)dz; z = (size_t)dz;