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https://github.com/Mercury-Language/mercury.git
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b765daecf7
Add a regression test for the issue with sub-word sized integers and
static data in the low-level C grades.
tests/hard_coded/Mercury.options:
tests/hard_coded/Mmakefile:
tests/hard_coded/int8_static_data.{m,exp}:
As above.
74 lines
2.0 KiB
Mathematica
74 lines
2.0 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et wm=0 tw=0
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%---------------------------------------------------------------------------%
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% Regression test for a problem where the static data we were generating for
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% ground terms (in low-leve C grades) was incorrect for sub-word sized
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% integers. We compile this test with -O0 because optimizations will mask
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% this bug in some grades.
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:- module int8_static_data.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module int8.
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:- import_module exception.
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:- import_module list.
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:- import_module string.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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As = [-128i8],
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foo(As, !IO).
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%---------------------------------------------------------------------------%
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:- pred foo(list(int8)::in, io::di, io::uo) is cc_multi.
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foo(As, !IO) :-
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(
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As = []
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;
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As = [A | _],
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( try []
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Result0 = myabs(A)
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then
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% If the bug is present we will erroneously print "-128" here.
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ResultStr = int8_to_string(Result0)
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catch_any _ ->
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% If things are working correctly the above call to myabs/1 should
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% throw an exception.
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ResultStr = "<<exception>>"
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),
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io.write_string(ResultStr, !IO),
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io.nl(!IO)
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).
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:- func myabs(int8) = int8.
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myabs(Num) =
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( if Num = my_min_int8 then
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throw(software_error("int8.myabs: abs(min_int8) would overflow"))
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else
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unchecked_abs(Num)
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).
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:- pragma no_inline(my_min_int8/0).
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:- func my_min_int8 = int8.
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my_min_int8 = -128i8.
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%---------------------------------------------------------------------------%
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:- end_module int8_static_data.
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%---------------------------------------------------------------------------%
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