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1 /* Data type conversion
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2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20
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21 /* This file contains the functions for converting expressions to
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22 different data types for the translation of the gfortran internal
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23 representation to GIMPLE. The only entry point is `convert'. */
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24
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25 #include "config.h"
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26 #include "system.h"
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27 #include "coretypes.h"
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28 #include "tree.h"
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29 #include "fold-const.h"
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30 #include "convert.h"
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31
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32 #include "gfortran.h"
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33 #include "trans.h"
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34 #include "trans-types.h"
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35
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36 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
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37 or validate its data type for a GIMPLE `if' or `while' statement.
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38
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39 The resulting type should always be `logical_type_node'. */
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40
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41 static tree
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42 truthvalue_conversion (tree expr)
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43 {
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44 switch (TREE_CODE (TREE_TYPE (expr)))
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45 {
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46 case BOOLEAN_TYPE:
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47 if (TREE_TYPE (expr) == logical_type_node)
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48 return expr;
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49 else if (COMPARISON_CLASS_P (expr))
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50 {
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51 TREE_TYPE (expr) = logical_type_node;
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52 return expr;
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53 }
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54 else if (TREE_CODE (expr) == NOP_EXPR)
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55 return fold_build1_loc (input_location, NOP_EXPR,
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56 logical_type_node,
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57 TREE_OPERAND (expr, 0));
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58 else
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59 return fold_build1_loc (input_location, NOP_EXPR,
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60 logical_type_node,
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61 expr);
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62
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63 case INTEGER_TYPE:
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64 if (TREE_CODE (expr) == INTEGER_CST)
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65 return integer_zerop (expr) ? logical_false_node
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66 : logical_true_node;
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67 else
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68 return fold_build2_loc (input_location, NE_EXPR,
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69 logical_type_node,
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70 expr, build_int_cst (TREE_TYPE (expr), 0));
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71
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72 default:
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73 gcc_unreachable ();
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74 }
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75 }
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76
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77 /* Create an expression whose value is that of EXPR,
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78 converted to type TYPE. The TREE_TYPE of the value
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79 is always TYPE. This function implements all reasonable
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80 conversions; callers should filter out those that are
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81 not permitted by the language being compiled. */
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82
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83 tree
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84 convert (tree type, tree expr)
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85 {
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86 tree e = expr;
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87 enum tree_code code;
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88
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89 if (type == TREE_TYPE (expr))
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90 return expr;
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91
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92 if (TREE_CODE (type) == ERROR_MARK
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93 || TREE_CODE (expr) == ERROR_MARK
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94 || TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
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95 return expr;
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96
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97 gcc_checking_assert (TREE_CODE (TREE_TYPE (expr)) != VOID_TYPE);
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98
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99 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
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100 return fold_build1_loc (input_location, NOP_EXPR, type, expr);
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101
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102 code = TREE_CODE (type);
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103 if (code == VOID_TYPE)
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104 return fold_build1_loc (input_location, CONVERT_EXPR, type, e);
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105 if (code == BOOLEAN_TYPE)
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106 return fold_build1_loc (input_location, NOP_EXPR, type,
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107 truthvalue_conversion (e));
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108 if (code == INTEGER_TYPE)
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109 return fold (convert_to_integer (type, e));
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110 if (code == POINTER_TYPE || code == REFERENCE_TYPE)
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111 return fold (convert_to_pointer (type, e));
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112 if (code == REAL_TYPE)
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113 return fold (convert_to_real (type, e));
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114 if (code == COMPLEX_TYPE)
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115 return fold (convert_to_complex (type, e));
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116 if (code == VECTOR_TYPE)
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117 return fold (convert_to_vector (type, e));
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118
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119 gcc_unreachable ();
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120 }
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