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b45b70199b
Estimated hours taken: 30 Branches: main Add a post-processing pass directly after mode checking that tries to transform procedures to avoid intermediate partially instantiated data structures. The Erlang backend in particular cannot handle partially instantiated data structures. compiler/delay_partial_inst.m: New module. compiler/check_hlds.m: Import delay_partial_inst.m compiler/modes.m: Call the delay partial instantiations pass after mode checking succeeds if it is enabled. compiler/options.m: Add a new internal option `--delay-partial-instantiations', disabled by default. compiler/handle_options.m: Make Erlang target imply --delay-partial-instantiations. compiler/notes/compiler_design.html: Mention delay_partial_inst.m tests/hard_coded/Mercury.options: tests/hard_coded/Mmakefile: tests/hard_coded/delay_partial_test.exp: tests/hard_coded/delay_partial_test.m: tests/hard_coded/delay_partial_test2.exp: tests/hard_coded/delay_partial_test2.m: Add test cases for --delay-partial-instantiations. compiler/goal_util.m: Fix a comment.
104 lines
1.9 KiB
Mathematica
104 lines
1.9 KiB
Mathematica
% Test the --delay-partial-instantiations option with disjunctions.
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:- module delay_partial_test2.
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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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:- implementation.
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:- import_module bool.
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:- import_module int.
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:- import_module list.
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%-----------------------------------------------------------------------------%
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main(!IO) :-
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( foo(2, Y) ->
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io.print(Y, !IO),
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io.nl(!IO)
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;
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io.print("foo failed\n", !IO)
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),
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( bar(3, Y2) ->
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io.print(Y2, !IO),
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io.nl(!IO)
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;
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io.print("bar failed\n", !IO)
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),
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quux(Q, yes),
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io.print(Q, !IO),
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io.nl(!IO).
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:- type t
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---> t(
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a :: int,
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b :: int
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).
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:- pred foo(int::in, t::out) is nondet.
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:- pragma no_inline(foo/2).
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foo(X, Y) :-
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U ^ b = U ^ a - 1,
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Y ^ b = Z,
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(
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X = 1,
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Y ^ a = Z,
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Z = U ^ b
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;
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int.even(X),
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Z = U ^ a,
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Y ^ a = U ^ a
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;
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int.odd(X),
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Z = U ^ a,
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Y ^ a = X
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),
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U ^ a = X.
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:- pred bar(int::in, t::out) is nondet.
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:- pragma no_inline(bar/2).
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bar(X, Y) :-
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Y ^ a = Z, % constructed outside
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U ^ b = U ^ a - 1,
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(
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X = 1,
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Z = U ^ b,
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Y ^ b = Z % ground inside
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;
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int.even(X),
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Z = U ^ a,
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Y ^ b = 2 % ground inside
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;
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int.odd(X),
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Z = U ^ a,
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Y ^ b = 3 % ground inside
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),
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U ^ a = X.
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:- type q
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---> qa(int)
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; qb(int, int)
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; qc(int)
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; qd.
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:- pred quux(q, bool).
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:- mode quux(in, in) is semidet.
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:- mode quux(out, in(bound(yes))) is multi.
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:- pragma no_inline(quux/2).
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quux(qa(_), no).
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quux(qb(_, _), no).
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quux(qc(42), yes).
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quux(qd, yes).
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%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=8 sw=4 et wm=0 tw=0
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