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Estimated hours taken: 0.2 Branches: main compiler/builtin_ops.m: Make int.plus, int.minus and int.times builtin operations, with the same implementations as int.+, int.- and int.*.
262 lines
10 KiB
Mathematica
262 lines
10 KiB
Mathematica
%-----------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%-----------------------------------------------------------------------------%
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% Copyright (C) 1999-2001, 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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% builtin_ops.m -- defines the builtin operator types.
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% Main author: fjh.
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%
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% This module defines various types which enumerate the different builtin
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% operators. Several of the different back-ends -- the bytecode back-end,
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% the LLDS, and the MLDS -- all use the same set of builtin operators.
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% These operators are defined here.
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%-----------------------------------------------------------------------------%
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:- module backend_libs__builtin_ops.
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:- interface.
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:- import_module hlds__hlds_pred.
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:- import_module mdbcomp__prim_data.
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:- import_module list.
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:- type unary_op
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---> mktag
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; tag
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; unmktag
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; strip_tag
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; mkbody
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; unmkbody
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; hash_string
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; bitwise_complement
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; (not).
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:- type binary_op
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---> (+) % integer arithmetic
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; (-)
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; (*)
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; (/) % integer division
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% assumed to truncate toward zero
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; (mod) % remainder (w.r.t. truncating integer division)
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% XXX `mod' should be renamed `rem'
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; (<<) % unchecked left shift
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; (>>) % unchecked right shift
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; (&) % bitwise and
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; ('|') % bitwise or
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; (^) % bitwise xor
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; (and) % logical and
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; (or) % logical or
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; eq % ==
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; ne % !=
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; body
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; array_index(array_elem_type)
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; str_eq % string comparisons
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; str_ne
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; str_lt
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; str_gt
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; str_le
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; str_ge
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; (<) % signed integer comparions
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; (>)
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; (<=)
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; (>=)
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; unsigned_le % unsigned integer comparison
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% Note that the arguments to `unsigned_le' are just ordinary
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% (signed) Mercury ints, but it does the comparison as
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% if they were first cast to an unsigned type, so e.g.
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% binary(unsigned_le, int_const(1), int_const(-1) returns true,
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% since (MR_Unsigned) 1 <= (MR_Unsigned) -1).
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; float_plus
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; float_minus
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; float_times
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; float_divide
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; float_eq
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; float_ne
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; float_lt
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; float_gt
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; float_le
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; float_ge.
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% For the MLDS back-end, we need to know the element type for each
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% array_index operation.
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%
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% Currently array index operations are only generated in limited
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% circumstances. Using a simple representation for them here,
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% rather than just putting the MLDS type here, avoids the need
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% for this module to depend on back-end specific stuff like MLDS types.
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:- type array_elem_type
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---> elem_type_string % ml_string_type
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; elem_type_int % mlds__native_int_type
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; elem_type_generic. % mlds__generic_type
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% translate_builtin:
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%
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% Given a module name, a predicate name, a proc_id and a list of the
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% arguments, find out if that procedure of that predicate is an inline
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% builtin. If so, return code which can be used to evaluate that call:
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% either an assignment (if the builtin is det) or a test (if the builtin
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% is semidet).
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%
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% There are some further guarantees on the form of the expressions
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% in the code returned -- see below for details.
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% (bytecode_gen.m depends on these guarantees.)
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%
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:- pred translate_builtin(module_name::in, string::in, proc_id::in,
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list(T)::in, simple_code(T)::out(simple_code)) is semidet.
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:- type simple_code(T)
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---> assign(T, simple_expr(T))
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; ref_assign(T, T)
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; test(simple_expr(T)).
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:- type simple_expr(T)
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---> leaf(T)
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; int_const(int)
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; float_const(float)
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; unary(unary_op, simple_expr(T))
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; binary(binary_op, simple_expr(T), simple_expr(T)).
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% Each test expression returned is guaranteed to be either a unary
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% or binary operator, applied to arguments that are either variables
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% (from the argument list) or constants.
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%
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% Each to be assigned expression is guaranteed to be either in a form
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% acceptable for a test rval, or in the form of a variable.
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:- inst simple_code
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---> assign(ground, simple_assign_expr)
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; ref_assign(ground, ground)
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; test(simple_test_expr).
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:- inst simple_arg_expr
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---> leaf(ground)
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; int_const(ground)
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; float_const(ground).
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:- inst simple_test_expr
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---> unary(ground, simple_arg_expr)
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; binary(ground, simple_arg_expr, simple_arg_expr).
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:- inst simple_assign_expr
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---> unary(ground, simple_arg_expr)
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; binary(ground, simple_arg_expr, simple_arg_expr)
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; leaf(ground).
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%-----------------------------------------------------------------------------%
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%-----------------------------------------------------------------------------%
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:- implementation.
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%-----------------------------------------------------------------------------%
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translate_builtin(FullyQualifiedModule, PredName, ProcId, Args, Code) :-
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proc_id_to_int(ProcId, ProcInt),
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% -- not yet:
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% FullyQualifiedModule = qualified(unqualified("std"), ModuleName),
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FullyQualifiedModule = unqualified(ModuleName),
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builtin_translation(ModuleName, PredName, ProcInt, Args, Code).
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:- pred builtin_translation(string::in, string::in, int::in, list(T)::in,
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simple_code(T)::out) is semidet.
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builtin_translation("private_builtin", "store_at_ref", 0, [X, Y],
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ref_assign(X, Y)).
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% Note that the code we generate for unsafe_type_cast is not type-correct.
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% Back-ends that require type-correct intermediate code (e.g. the MLDS
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% back-end) must handle unsafe_type_cast separately, rather than by calling
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% builtin_translation.
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builtin_translation("private_builtin", "unsafe_type_cast", 0, [X, Y],
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assign(Y, leaf(X))).
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builtin_translation("builtin", "unsafe_promise_unique", 0, [X, Y],
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assign(Y, leaf(X))).
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builtin_translation("private_builtin", "builtin_int_gt", 0, [X, Y],
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test(binary((>), leaf(X), leaf(Y)))).
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builtin_translation("private_builtin", "builtin_int_lt", 0, [X, Y],
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test(binary((<), leaf(X), leaf(Y)))).
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builtin_translation("term_size_prof_builtin", "term_size_plus", 0, [X, Y, Z],
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assign(Z, binary((+), leaf(X), leaf(Y)))).
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builtin_translation("int", "+", 0, [X, Y, Z],
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assign(Z, binary((+), leaf(X), leaf(Y)))).
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builtin_translation("int", "+", 1, [X, Y, Z],
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assign(X, binary((-), leaf(Z), leaf(Y)))).
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builtin_translation("int", "+", 2, [X, Y, Z],
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assign(Y, binary((-), leaf(Z), leaf(X)))).
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builtin_translation("int", "plus", 0, [X, Y, Z],
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assign(Z, binary((+), leaf(X), leaf(Y)))).
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builtin_translation("int", "-", 0, [X, Y, Z],
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assign(Z, binary((-), leaf(X), leaf(Y)))).
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builtin_translation("int", "-", 1, [X, Y, Z],
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assign(X, binary((+), leaf(Y), leaf(Z)))).
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builtin_translation("int", "-", 2, [X, Y, Z],
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assign(Y, binary((-), leaf(X), leaf(Z)))).
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builtin_translation("int", "minus", 0, [X, Y, Z],
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assign(Z, binary((-), leaf(X), leaf(Y)))).
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builtin_translation("int", "*", 0, [X, Y, Z],
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assign(Z, binary((*), leaf(X), leaf(Y)))).
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builtin_translation("int", "times", 0, [X, Y, Z],
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assign(Z, binary((*), leaf(X), leaf(Y)))).
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builtin_translation("int", "unchecked_quotient", 0, [X, Y, Z],
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assign(Z, binary((/), leaf(X), leaf(Y)))).
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builtin_translation("int", "unchecked_rem", 0, [X, Y, Z],
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assign(Z, binary((mod), leaf(X), leaf(Y)))).
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builtin_translation("int", "unchecked_left_shift", 0, [X, Y, Z],
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assign(Z, binary((<<), leaf(X), leaf(Y)))).
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builtin_translation("int", "unchecked_right_shift", 0, [X, Y, Z],
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assign(Z, binary((>>), leaf(X), leaf(Y)))).
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builtin_translation("int", "/\\", 0, [X, Y, Z],
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assign(Z, binary((&), leaf(X), leaf(Y)))).
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builtin_translation("int", "\\/", 0, [X, Y, Z],
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assign(Z, binary(('|'), leaf(X), leaf(Y)))).
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builtin_translation("int", "xor", 0, [X, Y, Z],
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assign(Z, binary((^), leaf(X), leaf(Y)))).
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builtin_translation("int", "xor", 1, [X, Y, Z],
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assign(Y, binary((^), leaf(X), leaf(Z)))).
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builtin_translation("int", "xor", 2, [X, Y, Z],
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assign(X, binary((^), leaf(Y), leaf(Z)))).
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builtin_translation("int", "+", 0, [X, Y],
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assign(Y, leaf(X))).
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builtin_translation("int", "-", 0, [X, Y],
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assign(Y, binary((-), int_const(0), leaf(X)))).
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builtin_translation("int", "\\", 0, [X, Y],
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assign(Y, unary(bitwise_complement, leaf(X)))).
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builtin_translation("int", ">", 0, [X, Y],
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test(binary((>), leaf(X), leaf(Y)))).
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builtin_translation("int", "<", 0, [X, Y],
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test(binary((<), leaf(X), leaf(Y)))).
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builtin_translation("int", ">=", 0, [X, Y],
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test(binary((>=), leaf(X), leaf(Y)))).
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builtin_translation("int", "=<", 0, [X, Y],
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test(binary((<=), leaf(X), leaf(Y)))).
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builtin_translation("float", "+", 0, [X, Y, Z],
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assign(Z, binary(float_plus, leaf(X), leaf(Y)))).
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builtin_translation("float", "-", 0, [X, Y, Z],
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assign(Z, binary(float_minus, leaf(X), leaf(Y)))).
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builtin_translation("float", "*", 0, [X, Y, Z],
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assign(Z, binary(float_times, leaf(X), leaf(Y)))).
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builtin_translation("float", "unchecked_quotient", 0, [X, Y, Z],
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assign(Z, binary(float_divide, leaf(X), leaf(Y)))).
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builtin_translation("float", "+", 0, [X, Y],
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assign(Y, leaf(X))).
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builtin_translation("float", "-", 0, [X, Y],
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assign(Y, binary(float_minus, float_const(0.0), leaf(X)))).
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builtin_translation("float", ">", 0, [X, Y],
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test(binary(float_gt, leaf(X), leaf(Y)))).
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builtin_translation("float", "<", 0, [X, Y],
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test(binary(float_lt, leaf(X), leaf(Y)))).
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builtin_translation("float", ">=", 0, [X, Y],
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test(binary(float_ge, leaf(X), leaf(Y)))).
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builtin_translation("float", "=<", 0, [X, Y],
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test(binary(float_le, leaf(X), leaf(Y)))).
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