1/* Data type conversion 2 Copyright (C) 1987-2015 Free Software Foundation, Inc. 3 4This file is part of GCC. 5 6GCC is free software; you can redistribute it and/or modify it under 7the terms of the GNU General Public License as published by the Free 8Software Foundation; either version 3, or (at your option) any later 9version. 10 11GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12WARRANTY; without even the implied warranty of MERCHANTABILITY or 13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14for more details. 15 16You should have received a copy of the GNU General Public License 17along 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 "hash-set.h" 29#include "machmode.h" 30#include "vec.h" 31#include "double-int.h" 32#include "input.h" 33#include "alias.h" 34#include "symtab.h" 35#include "options.h" 36#include "wide-int.h" 37#include "inchash.h" 38#include "tree.h" 39#include "fold-const.h" 40#include "convert.h" 41 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. 44 45 The resulting type should always be `boolean_type_node'. */ 46 47static tree 48truthvalue_conversion (tree expr) 49{ 50 switch (TREE_CODE (TREE_TYPE (expr))) 51 { 52 case BOOLEAN_TYPE: 53 if (TREE_TYPE (expr) == boolean_type_node) 54 return expr; 55 else if (COMPARISON_CLASS_P (expr)) 56 { 57 TREE_TYPE (expr) = boolean_type_node; 58 return expr; 59 } 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)); 63 else 64 return fold_build1_loc (input_location, NOP_EXPR, boolean_type_node, 65 expr); 66 67 case INTEGER_TYPE: 68 if (TREE_CODE (expr) == INTEGER_CST) 69 return integer_zerop (expr) ? boolean_false_node : boolean_true_node; 70 else 71 return fold_build2_loc (input_location, NE_EXPR, boolean_type_node, 72 expr, build_int_cst (TREE_TYPE (expr), 0)); 73 74 default: 75 gcc_unreachable (); 76 } 77} 78 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. */ 84 85tree 86convert (tree type, tree expr) 87{ 88 tree e = expr; 89 enum tree_code code; 90 91 if (type == TREE_TYPE (expr)) 92 return expr; 93 94 if (TREE_CODE (type) == ERROR_MARK 95 || TREE_CODE (expr) == ERROR_MARK 96 || TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK) 97 return expr; 98 99 gcc_checking_assert (TREE_CODE (TREE_TYPE (expr)) != VOID_TYPE); 100 101 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))) 102 return fold_build1_loc (input_location, NOP_EXPR, type, expr); 103 104 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)); 120 121 gcc_unreachable (); 122} 123 124