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/* Data type conversion
Copyright (C) 1987-2015 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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, or (at your option) any later
version.
GCC 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* This file contains the functions for converting expressions to
different data types for the translation of the gfortran internal
representation to GIMPLE. The only entry point is `convert'. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "options.h"
#include "tree.h"
#include "fold-const.h"
#include "convert.h"
/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
or validate its data type for a GIMPLE `if' or `while' statement.
The resulting type should always be `boolean_type_node'. */
static tree
truthvalue_conversion (tree expr)
{
switch (TREE_CODE (TREE_TYPE (expr)))
{
case BOOLEAN_TYPE:
if (TREE_TYPE (expr) == boolean_type_node)
return expr;
else if (COMPARISON_CLASS_P (expr))
{
TREE_TYPE (expr) = boolean_type_node;
return expr;
}
else if (TREE_CODE (expr) == NOP_EXPR)
return fold_build1_loc (input_location, NOP_EXPR,
boolean_type_node, TREE_OPERAND (expr, 0));
else
return fold_build1_loc (input_location, NOP_EXPR, boolean_type_node,
expr);
case INTEGER_TYPE:
if (TREE_CODE (expr) == INTEGER_CST)
return integer_zerop (expr) ? boolean_false_node : boolean_true_node;
else
return fold_build2_loc (input_location, NE_EXPR, boolean_type_node,
expr, build_int_cst (TREE_TYPE (expr), 0));
default:
gcc_unreachable ();
}
}
/* Create an expression whose value is that of EXPR,
converted to type TYPE. The TREE_TYPE of the value
is always TYPE. This function implements all reasonable
conversions; callers should filter out those that are
not permitted by the language being compiled. */
tree
convert (tree type, tree expr)
{
tree e = expr;
enum tree_code code;
if (type == TREE_TYPE (expr))
return expr;
if (TREE_CODE (type) == ERROR_MARK
|| TREE_CODE (expr) == ERROR_MARK
|| TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
return expr;
gcc_checking_assert (TREE_CODE (TREE_TYPE (expr)) != VOID_TYPE);
if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
return fold_build1_loc (input_location, NOP_EXPR, type, expr);
code = TREE_CODE (type);
if (code == VOID_TYPE)
return fold_build1_loc (input_location, CONVERT_EXPR, type, e);
if (code == BOOLEAN_TYPE)
return fold_build1_loc (input_location, NOP_EXPR, type,
truthvalue_conversion (e));
if (code == INTEGER_TYPE)
return fold (convert_to_integer (type, e));
if (code == POINTER_TYPE || code == REFERENCE_TYPE)
return fold (convert_to_pointer (type, e));
if (code == REAL_TYPE)
return fold (convert_to_real (type, e));
if (code == COMPLEX_TYPE)
return fold (convert_to_complex (type, e));
if (code == VECTOR_TYPE)
return fold (convert_to_vector (type, e));
gcc_unreachable ();
}
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