Mercurial > hg > CbC > CbC_gcc
annotate gcc/c-convert.c @ 81:dbfc0d2dde36
minor fix
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Sat, 24 Sep 2011 02:43:04 +0900 |
parents | f6334be47118 |
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rev | line source |
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0 | 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, 2010 Free Software Foundation, Inc. |
0 | 4 |
5 This file is part of GCC. | |
6 | |
7 GCC is free software; you can redistribute it and/or modify it under | |
8 the terms of the GNU General Public License as published by the Free | |
9 Software Foundation; either version 3, or (at your option) any later | |
10 version. | |
11 | |
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 for more details. | |
16 | |
17 You should have received a copy of the GNU General Public License | |
18 along with GCC; see the file COPYING3. If not see | |
19 <http://www.gnu.org/licenses/>. */ | |
20 | |
21 | |
22 /* This file contains the functions for converting C expressions | |
23 to different data types. The only entry point is `convert'. | |
24 Every language front end must have a `convert' function | |
25 but what kind of conversions it does will depend on the language. */ | |
26 | |
27 #include "config.h" | |
28 #include "system.h" | |
29 #include "coretypes.h" | |
30 #include "tm.h" | |
31 #include "tree.h" | |
32 #include "flags.h" | |
33 #include "convert.h" | |
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34 #include "c-family/c-common.h" |
0 | 35 #include "c-tree.h" |
36 #include "langhooks.h" | |
37 #include "target.h" | |
38 | |
39 /* Change of width--truncation and extension of integers or reals-- | |
40 is represented with NOP_EXPR. Proper functioning of many things | |
41 assumes that no other conversions can be NOP_EXPRs. | |
42 | |
43 Conversion between integer and pointer is represented with CONVERT_EXPR. | |
44 Converting integer to real uses FLOAT_EXPR | |
45 and real to integer uses FIX_TRUNC_EXPR. | |
46 | |
47 Here is a list of all the functions that assume that widening and | |
48 narrowing is always done with a NOP_EXPR: | |
49 In convert.c, convert_to_integer. | |
50 In c-typeck.c, build_binary_op (boolean ops), and | |
51 c_common_truthvalue_conversion. | |
52 In expr.c: expand_expr, for operands of a MULT_EXPR. | |
53 In fold-const.c: fold. | |
54 In tree.c: get_narrower and get_unwidened. */ | |
55 | |
56 /* Subroutines of `convert'. */ | |
57 | |
58 | |
59 | |
60 /* Create an expression whose value is that of EXPR, | |
61 converted to type TYPE. The TREE_TYPE of the value | |
62 is always TYPE. This function implements all reasonable | |
63 conversions; callers should filter out those that are | |
64 not permitted by the language being compiled. */ | |
65 | |
66 tree | |
67 convert (tree type, tree expr) | |
68 { | |
69 tree e = expr; | |
70 enum tree_code code = TREE_CODE (type); | |
71 const char *invalid_conv_diag; | |
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72 tree ret; |
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73 location_t loc = EXPR_LOCATION (expr); |
0 | 74 |
75 if (type == error_mark_node | |
76 || expr == error_mark_node | |
77 || TREE_TYPE (expr) == error_mark_node) | |
78 return error_mark_node; | |
79 | |
80 if ((invalid_conv_diag | |
81 = targetm.invalid_conversion (TREE_TYPE (expr), type))) | |
82 { | |
83 error (invalid_conv_diag); | |
84 return error_mark_node; | |
85 } | |
86 | |
87 if (type == TREE_TYPE (expr)) | |
88 return expr; | |
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89 ret = targetm.convert_to_type (type, expr); |
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90 if (ret) |
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91 return ret; |
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92 |
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93 STRIP_TYPE_NOPS (e); |
0 | 94 |
95 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr))) | |
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96 return fold_convert_loc (loc, type, expr); |
0 | 97 if (TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK) |
98 return error_mark_node; | |
99 if (TREE_CODE (TREE_TYPE (expr)) == VOID_TYPE) | |
100 { | |
101 error ("void value not ignored as it ought to be"); | |
102 return error_mark_node; | |
103 } | |
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104 |
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105 switch (code) |
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106 { |
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107 case VOID_TYPE: |
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108 return fold_convert_loc (loc, type, e); |
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109 |
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110 case INTEGER_TYPE: |
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111 case ENUMERAL_TYPE: |
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112 ret = convert_to_integer (type, e); |
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113 goto maybe_fold; |
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114 |
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115 case BOOLEAN_TYPE: |
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116 return fold_convert_loc |
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117 (loc, type, c_objc_common_truthvalue_conversion (input_location, expr)); |
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118 |
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119 case POINTER_TYPE: |
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120 case REFERENCE_TYPE: |
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121 ret = convert_to_pointer (type, e); |
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122 goto maybe_fold; |
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123 |
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124 case REAL_TYPE: |
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125 ret = convert_to_real (type, e); |
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126 goto maybe_fold; |
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127 |
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128 case FIXED_POINT_TYPE: |
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129 ret = convert_to_fixed (type, e); |
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130 goto maybe_fold; |
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131 |
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132 case COMPLEX_TYPE: |
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133 /* If converting from COMPLEX_TYPE to a different COMPLEX_TYPE |
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134 and e is not COMPLEX_EXPR, convert_to_complex uses save_expr, |
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135 but for the C FE c_save_expr needs to be called instead. */ |
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136 if (TREE_CODE (TREE_TYPE (e)) == COMPLEX_TYPE) |
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137 { |
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138 tree subtype = TREE_TYPE (type); |
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139 tree elt_type = TREE_TYPE (TREE_TYPE (e)); |
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140 |
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141 if (TYPE_MAIN_VARIANT (elt_type) != TYPE_MAIN_VARIANT (subtype) |
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142 && TREE_CODE (e) != COMPLEX_EXPR) |
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143 { |
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144 if (in_late_binary_op) |
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145 e = save_expr (e); |
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146 else |
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147 e = c_save_expr (e); |
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148 ret |
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149 = fold_build2 (COMPLEX_EXPR, type, |
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150 convert (subtype, |
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151 fold_build1 (REALPART_EXPR, |
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152 elt_type, e)), |
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153 convert (subtype, |
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154 fold_build1 (IMAGPART_EXPR, |
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155 elt_type, e))); |
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156 goto maybe_fold; |
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157 } |
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158 } |
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159 ret = convert_to_complex (type, e); |
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160 goto maybe_fold; |
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161 |
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162 case VECTOR_TYPE: |
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163 ret = convert_to_vector (type, e); |
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164 goto maybe_fold; |
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165 |
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166 case RECORD_TYPE: |
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167 case UNION_TYPE: |
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168 if (lang_hooks.types_compatible_p (type, TREE_TYPE (expr))) |
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169 return e; |
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170 break; |
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171 |
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172 default: |
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173 break; |
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174 |
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175 maybe_fold: |
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176 if (TREE_CODE (ret) != C_MAYBE_CONST_EXPR) |
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177 ret = fold (ret); |
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178 return ret; |
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179 } |
0 | 180 |
181 error ("conversion to non-scalar type requested"); | |
182 return error_mark_node; | |
183 } |