1 /* Data type conversion
2 Copyright (C) 1987-2021 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
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
9 version.
10
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
14 for more details.
15
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/>. */
19
20
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'. */
24
25 #include "config.h"
26 #include "system.h"
27 #include "coretypes.h"
28 #include "tree.h"
29 #include "fold-const.h"
30 #include "convert.h"
31
32 #include "gfortran.h"
33 #include "trans.h"
34 #include "trans-types.h"
35
36 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
37 or validate its data type for a GIMPLE `if' or `while' statement.
38
39 The resulting type should always be `logical_type_node'. */
40
41 static tree
truthvalue_conversion(tree expr)42 truthvalue_conversion (tree expr)
43 {
44 switch (TREE_CODE (TREE_TYPE (expr)))
45 {
46 case BOOLEAN_TYPE:
47 if (TREE_TYPE (expr) == logical_type_node)
48 return expr;
49 else if (COMPARISON_CLASS_P (expr))
50 {
51 TREE_TYPE (expr) = logical_type_node;
52 return expr;
53 }
54 else if (TREE_CODE (expr) == NOP_EXPR)
55 return fold_build1_loc (input_location, NOP_EXPR,
56 logical_type_node,
57 TREE_OPERAND (expr, 0));
58 else
59 return fold_build1_loc (input_location, NOP_EXPR,
60 logical_type_node,
61 expr);
62
63 case INTEGER_TYPE:
64 if (TREE_CODE (expr) == INTEGER_CST)
65 return integer_zerop (expr) ? logical_false_node
66 : logical_true_node;
67 else
68 return fold_build2_loc (input_location, NE_EXPR,
69 logical_type_node,
70 expr, build_int_cst (TREE_TYPE (expr), 0));
71
72 default:
73 gcc_unreachable ();
74 }
75 }
76
77 /* Create an expression whose value is that of EXPR,
78 converted to type TYPE. The TREE_TYPE of the value
79 is always TYPE. This function implements all reasonable
80 conversions; callers should filter out those that are
81 not permitted by the language being compiled. */
82
83 tree
convert(tree type,tree expr)84 convert (tree type, tree expr)
85 {
86 tree e = expr;
87 enum tree_code code;
88
89 if (type == TREE_TYPE (expr))
90 return expr;
91
92 if (TREE_CODE (type) == ERROR_MARK
93 || TREE_CODE (expr) == ERROR_MARK
94 || TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
95 return expr;
96
97 gcc_checking_assert (TREE_CODE (TREE_TYPE (expr)) != VOID_TYPE);
98
99 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
100 return fold_build1_loc (input_location, NOP_EXPR, type, expr);
101
102 code = TREE_CODE (type);
103 if (code == VOID_TYPE)
104 return fold_build1_loc (input_location, CONVERT_EXPR, type, e);
105 if (code == BOOLEAN_TYPE)
106 return fold_build1_loc (input_location, NOP_EXPR, type,
107 truthvalue_conversion (e));
108 if (code == INTEGER_TYPE)
109 return fold (convert_to_integer (type, e));
110 if (code == POINTER_TYPE || code == REFERENCE_TYPE)
111 return fold (convert_to_pointer (type, e));
112 if (code == REAL_TYPE)
113 return fold (convert_to_real (type, e));
114 if (code == COMPLEX_TYPE)
115 return fold (convert_to_complex (type, e));
116 if (code == VECTOR_TYPE)
117 return fold (convert_to_vector (type, e));
118
119 gcc_unreachable ();
120 }
121
122