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905e4a114f
Estimated hours taken: 4 Branches: main compiler/*.m: Convert a bunch of modules to four-space indentation. In the process, fix departures from our coding standards. In some cases, do minor other cleanups such as changing argument orders to be friendly to state variables. There are no algorithmic changes.
89 lines
3.7 KiB
Mathematica
89 lines
3.7 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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% Copyright (C) 2000, 2003-2005 The University of Melbourne.
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% This file may only be copied under the terms of the GNU General
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% Public License - see the file COPYING in the Mercury distribution.
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%-----------------------------------------------------------------------------%
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%
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% This module defines the `code_model' data type, and associated procedures.
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% The `code_model' type is a simplified version of the `determinism' type
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% that is defined in prog_data.m. It ignores most of the distinctions in
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% the determinism type and keeps only the distinctions that are important
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% for code generation.
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%
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% We define this in a different module than the `determinism' type because
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% it is only used by some of the different back-ends, not all of them.
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% It is used by the MLDS, LLDS, and bytecode back-ends, but not by the
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% Aditi-RL back-end.
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%
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%-----------------------------------------------------------------------------%
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:- module hlds__code_model.
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:- interface.
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:- import_module hlds__hlds_goal.
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:- import_module hlds__hlds_pred.
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:- import_module parse_tree__prog_data.
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:- type code_model
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---> model_det % functional & total
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; model_semi % just functional
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; model_non. % not functional
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:- pred determinism_to_code_model(determinism, code_model).
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:- mode determinism_to_code_model(in, out) is det.
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:- mode determinism_to_code_model(out, in) is multi.
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:- pred proc_info_interface_code_model(proc_info::in, code_model::out) is det.
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:- pred goal_info_get_code_model(hlds_goal_info::in, code_model::out) is det.
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% Construct a representation of the interface determinism of a procedure.
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% The code we have chosen is not sequential; instead it encodes the various
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% properties of each determinism. This must match the encoding of
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% MR_Determinism in mercury_stack_layout.h.
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%
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% The 8 bit is set iff the context is first_solution.
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% The 4 bit is set iff the min number of solutions is more than zero.
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% The 2 bit is set iff the max number of solutions is more than zero.
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% The 1 bit is set iff the max number of solutions is more than one.
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%
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:- func represent_determinism(determinism) = int.
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%-----------------------------------------------------------------------------%
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:- implementation.
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:- import_module mdbcomp.program_representation.
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:- import_module int.
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determinism_to_code_model(det, model_det).
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determinism_to_code_model(semidet, model_semi).
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determinism_to_code_model(nondet, model_non).
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determinism_to_code_model(multidet, model_non).
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determinism_to_code_model(cc_nondet, model_semi).
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determinism_to_code_model(cc_multidet, model_det).
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determinism_to_code_model(erroneous, model_det).
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determinism_to_code_model(failure, model_semi).
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proc_info_interface_code_model(ProcInfo, CodeModel) :-
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proc_info_interface_determinism(ProcInfo, Determinism),
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determinism_to_code_model(Determinism, CodeModel).
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goal_info_get_code_model(GoalInfo, CodeModel) :-
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goal_info_get_determinism(GoalInfo, Determinism),
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determinism_to_code_model(Determinism, CodeModel).
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represent_determinism(det) = detism_rep(det_rep).
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represent_determinism(semidet) = detism_rep(semidet_rep).
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represent_determinism(nondet) = detism_rep(nondet_rep).
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represent_determinism(multidet) = detism_rep(multidet_rep).
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represent_determinism(erroneous) = detism_rep(erroneous_rep).
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represent_determinism(failure) = detism_rep(failure_rep).
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represent_determinism(cc_nondet) = detism_rep(cc_nondet_rep).
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represent_determinism(cc_multidet) = detism_rep(cc_multidet_rep).
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%-----------------------------------------------------------------------------%
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