1 /* Data type conversion
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file contains the functions for converting expressions to
22 different data types for the translation of the gfortran internal
23 representation to GIMPLE. The only entry point is `convert'. */
27 #include "coretypes.h"
31 #include "double-int.h"
39 #include "fold-const.h"
42 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
43 or validate its data type for a GIMPLE `if' or `while' statement.
45 The resulting type should always be `boolean_type_node'. */
48 truthvalue_conversion (tree expr
)
50 switch (TREE_CODE (TREE_TYPE (expr
)))
53 if (TREE_TYPE (expr
) == boolean_type_node
)
55 else if (COMPARISON_CLASS_P (expr
))
57 TREE_TYPE (expr
) = boolean_type_node
;
60 else if (TREE_CODE (expr
) == NOP_EXPR
)
61 return fold_build1_loc (input_location
, NOP_EXPR
,
62 boolean_type_node
, TREE_OPERAND (expr
, 0));
64 return fold_build1_loc (input_location
, NOP_EXPR
, boolean_type_node
,
68 if (TREE_CODE (expr
) == INTEGER_CST
)
69 return integer_zerop (expr
) ? boolean_false_node
: boolean_true_node
;
71 return fold_build2_loc (input_location
, NE_EXPR
, boolean_type_node
,
72 expr
, build_int_cst (TREE_TYPE (expr
), 0));
79 /* Create an expression whose value is that of EXPR,
80 converted to type TYPE. The TREE_TYPE of the value
81 is always TYPE. This function implements all reasonable
82 conversions; callers should filter out those that are
83 not permitted by the language being compiled. */
86 convert (tree type
, tree expr
)
91 if (type
== TREE_TYPE (expr
))
94 if (TREE_CODE (type
) == ERROR_MARK
95 || TREE_CODE (expr
) == ERROR_MARK
96 || TREE_CODE (TREE_TYPE (expr
)) == ERROR_MARK
)
99 gcc_checking_assert (TREE_CODE (TREE_TYPE (expr
)) != VOID_TYPE
);
101 if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (expr
)))
102 return fold_build1_loc (input_location
, NOP_EXPR
, type
, expr
);
104 code
= TREE_CODE (type
);
105 if (code
== VOID_TYPE
)
106 return fold_build1_loc (input_location
, CONVERT_EXPR
, type
, e
);
107 if (code
== BOOLEAN_TYPE
)
108 return fold_build1_loc (input_location
, NOP_EXPR
, type
,
109 truthvalue_conversion (e
));
110 if (code
== INTEGER_TYPE
)
111 return fold (convert_to_integer (type
, e
));
112 if (code
== POINTER_TYPE
|| code
== REFERENCE_TYPE
)
113 return fold (convert_to_pointer (type
, e
));
114 if (code
== REAL_TYPE
)
115 return fold (convert_to_real (type
, e
));
116 if (code
== COMPLEX_TYPE
)
117 return fold (convert_to_complex (type
, e
));
118 if (code
== VECTOR_TYPE
)
119 return fold (convert_to_vector (type
, e
));