Mercurial > hg > CbC > CbC_gcc

annotate gcc/c-convert.c @ 63:b7f97abdc517 gcc-4.6-20100522

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update gcc from gcc-4.5.0 to gcc-4.6
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Mon, 24 May 2010 12:47:05 +0900
parents 77e2b8dfacca
children f6334be47118
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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1 /* Language-level data type conversion for GNU C.
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2 Copyright (C) 1987, 1988, 1991, 1998, 2002, 2003, 2004, 2005, 2007, 2008,
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3 2009 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it under
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8 the terms of the GNU General Public License as published by the Free
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9 Software Foundation; either version 3, or (at your option) any later
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10 version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21
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22 /* This file contains the functions for converting C expressions
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23 to different data types. The only entry point is `convert'.
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24 Every language front end must have a `convert' function
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25 but what kind of conversions it does will depend on the language. */
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26
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27 #include "config.h"
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28 #include "system.h"
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29 #include "coretypes.h"
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30 #include "tm.h"
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31 #include "tree.h"
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32 #include "flags.h"
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33 #include "convert.h"
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34 #include "c-common.h"
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35 #include "c-tree.h"
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36 #include "langhooks.h"
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37 #include "toplev.h"
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38 #include "target.h"
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39
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40 /* Change of width--truncation and extension of integers or reals--
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41 is represented with NOP_EXPR. Proper functioning of many things
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42 assumes that no other conversions can be NOP_EXPRs.
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43
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44 Conversion between integer and pointer is represented with CONVERT_EXPR.
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45 Converting integer to real uses FLOAT_EXPR
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46 and real to integer uses FIX_TRUNC_EXPR.
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47
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48 Here is a list of all the functions that assume that widening and
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49 narrowing is always done with a NOP_EXPR:
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50 In convert.c, convert_to_integer.
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51 In c-typeck.c, build_binary_op (boolean ops), and
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52 c_common_truthvalue_conversion.
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53 In expr.c: expand_expr, for operands of a MULT_EXPR.
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54 In fold-const.c: fold.
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55 In tree.c: get_narrower and get_unwidened. */
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56
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57 /* Subroutines of `convert'. */
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58
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59
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60
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61 /* Create an expression whose value is that of EXPR,
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62 converted to type TYPE. The TREE_TYPE of the value
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63 is always TYPE. This function implements all reasonable
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64 conversions; callers should filter out those that are
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65 not permitted by the language being compiled. */
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66
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67 tree
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68 convert (tree type, tree expr)
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69 {
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70 tree e = expr;
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71 enum tree_code code = TREE_CODE (type);
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72 const char *invalid_conv_diag;
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73 tree ret;
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74 location_t loc = EXPR_LOCATION (expr);
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75
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76 if (type == error_mark_node
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77 || expr == error_mark_node
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78 || TREE_TYPE (expr) == error_mark_node)
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79 return error_mark_node;
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80
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81 if ((invalid_conv_diag
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82 = targetm.invalid_conversion (TREE_TYPE (expr), type)))
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83 {
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84 error (invalid_conv_diag);
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85 return error_mark_node;
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86 }
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87
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88 if (type == TREE_TYPE (expr))
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89 return expr;
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90 ret = targetm.convert_to_type (type, expr);
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91 if (ret)
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92 return ret;
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93
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94 STRIP_TYPE_NOPS (e);
0
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95
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96 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
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97 return fold_convert_loc (loc, type, expr);
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98 if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
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99 return error_mark_node;
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100 if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE)
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101 {
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102 error ("void value not ignored as it ought to be");
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103 return error_mark_node;
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104 }
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105
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106 switch (code)
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107 {
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108 case VOID_TYPE:
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109 return fold_convert_loc (loc, type, e);
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110
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111 case INTEGER_TYPE:
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112 case ENUMERAL_TYPE:
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113 ret = convert_to_integer (type, e);
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114 goto maybe_fold;
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115
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116 case BOOLEAN_TYPE:
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117 return fold_convert_loc
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118 (loc, type, c_objc_common_truthvalue_conversion (input_location, expr));
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119
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120 case POINTER_TYPE:
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121 case REFERENCE_TYPE:
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122 ret = convert_to_pointer (type, e);
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123 goto maybe_fold;
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124
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125 case REAL_TYPE:
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126 ret = convert_to_real (type, e);
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127 goto maybe_fold;
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128
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129 case FIXED_POINT_TYPE:
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130 ret = convert_to_fixed (type, e);
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131 goto maybe_fold;
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132
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133 case COMPLEX_TYPE:
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134 ret = convert_to_complex (type, e);
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135 goto maybe_fold;
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136
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137 case VECTOR_TYPE:
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138 ret = convert_to_vector (type, e);
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139 goto maybe_fold;
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diff changeset
140
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
141 case RECORD_TYPE:
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
142 case UNION_TYPE:
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
143 if (lang_hooks.types_compatible_p (type, TREE_TYPE (expr)))
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
144 return e;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
145 break;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
146
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
147 default:
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
148 break;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
149
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
150 maybe_fold:
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
151 if (TREE_CODE (ret) != C_MAYBE_CONST_EXPR)
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
152 ret = fold (ret);
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
153 return ret;
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
154 }
0
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
155
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 error ("conversion to non-scalar type requested");
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 return error_mark_node;
a06113de4d67 first commit
kent <kent@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 }