1 /* Data type conversion 2 Copyright (C) 1987-2019 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 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 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