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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2008-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING. If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
#if defined (HAVE_CONFIG_H)
# include "config.h"
#endif
#include "interpreter.h"
#include "ov.h"
#include "pt-cbinop.h"
#include "pt-eval.h"
#include "pt-unop.h"
namespace octave
{
octave_value
tree_compound_binary_expression::evaluate (tree_evaluator& tw, int)
{
octave_value val;
if (m_lhs)
{
octave_value a = m_lhs->evaluate (tw);
if (a.is_defined () && m_rhs)
{
octave_value b = m_rhs->evaluate (tw);
if (b.is_defined ())
{
interpreter& interp = tw.get_interpreter ();
type_info& ti = interp.get_type_info ();
val = ::do_binary_op (ti, m_etype, a, b);
}
}
}
return val;
}
typedef tree_expression* tree_expression_ptr_t;
// If a tree expression is a transpose or hermitian transpose, return
// the argument and corresponding operator.
static octave_value::unary_op
strip_trans_herm (tree_expression_ptr_t& exp)
{
if (exp->is_unary_expression ())
{
tree_unary_expression *uexp
= dynamic_cast<tree_unary_expression *> (exp);
octave_value::unary_op op = uexp->op_type ();
if (op == octave_value::op_transpose
|| op == octave_value::op_hermitian)
exp = uexp->operand ();
else
op = octave_value::unknown_unary_op;
return op;
}
else
return octave_value::unknown_unary_op;
}
#if 0
// Restore this code if short-circuit behavior can be preserved when needed.
// See bug #54465.
static octave_value::unary_op
strip_not (tree_expression_ptr_t& exp)
{
if (exp->is_unary_expression ())
{
tree_unary_expression *uexp
= dynamic_cast<tree_unary_expression *> (exp);
octave_value::unary_op op = uexp->op_type ();
if (op == octave_value::op_not)
exp = uexp->operand ();
else
op = octave_value::unknown_unary_op;
return op;
}
else
return octave_value::unknown_unary_op;
}
#endif
// Possibly convert multiplication to trans_mul, mul_trans, herm_mul,
// or mul_herm.
static octave_value::compound_binary_op
simplify_mul_op (tree_expression_ptr_t& a, tree_expression_ptr_t& b)
{
octave_value::compound_binary_op retop
= octave_value::unknown_compound_binary_op;
octave_value::unary_op opa = strip_trans_herm (a);
if (opa == octave_value::op_hermitian)
retop = octave_value::op_herm_mul;
else if (opa == octave_value::op_transpose)
retop = octave_value::op_trans_mul;
else
{
octave_value::unary_op opb = strip_trans_herm (b);
if (opb == octave_value::op_hermitian)
retop = octave_value::op_mul_herm;
else if (opb == octave_value::op_transpose)
retop = octave_value::op_mul_trans;
}
return retop;
}
// Possibly convert left division to trans_ldiv or herm_ldiv.
static octave_value::compound_binary_op
simplify_ldiv_op (tree_expression_ptr_t& a, tree_expression_ptr_t&)
{
octave_value::compound_binary_op retop
= octave_value::unknown_compound_binary_op;
octave_value::unary_op opa = strip_trans_herm (a);
if (opa == octave_value::op_hermitian)
retop = octave_value::op_herm_ldiv;
else if (opa == octave_value::op_transpose)
retop = octave_value::op_trans_ldiv;
return retop;
}
// Possibly contract and/or with negation.
#if 0
// Restore this code if short-circuit behavior can be preserved when needed.
// See bug #54465.
static octave_value::compound_binary_op
simplify_and_or_op (tree_expression_ptr_t& a, tree_expression_ptr_t& b,
octave_value::binary_op op)
{
octave_value::compound_binary_op retop
= octave_value::unknown_compound_binary_op;
octave_value::unary_op opa = strip_not (a);
if (opa == octave_value::op_not)
{
if (op == octave_value::op_el_and)
retop = octave_value::op_el_not_and;
else if (op == octave_value::op_el_or)
retop = octave_value::op_el_not_or;
}
else
{
octave_value::unary_op opb = strip_not (b);
if (opb == octave_value::op_not)
{
if (op == octave_value::op_el_and)
retop = octave_value::op_el_and_not;
else if (op == octave_value::op_el_or)
retop = octave_value::op_el_or_not;
}
}
return retop;
}
#endif
tree_binary_expression *
maybe_compound_binary_expression (tree_expression *a, tree_expression *b,
int l, int c, octave_value::binary_op t)
{
tree_expression *ca = a;
tree_expression *cb = b;
octave_value::compound_binary_op ct;
switch (t)
{
case octave_value::op_mul:
ct = simplify_mul_op (ca, cb);
break;
case octave_value::op_ldiv:
ct = simplify_ldiv_op (ca, cb);
break;
#if 0
// Restore this case if short-circuit behavior can be preserved
// when needed. See bug #54465.
case octave_value::op_el_and:
case octave_value::op_el_or:
ct = simplify_and_or_op (ca, cb, t);
break;
#endif
default:
ct = octave_value::unknown_compound_binary_op;
break;
}
tree_binary_expression *ret
= (ct == octave_value::unknown_compound_binary_op
? new tree_binary_expression (a, b, l, c, t)
: new tree_compound_binary_expression (a, b, l, c, t, ca, cb, ct));
return ret;
}
}
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